Operation and Maintenance Manual - 287 pages

Operation and Maintenance Manual - 287 pages
PEN00101-04
ARTICULATED
DUMP TRUCK
HM300 -2
SERIAL NUMBERS
NOTICE
Komatsu has Operation & Maintenance Manuals written
in some other languages. if a foreign language manual
is necessary, contact your local distributor for
availability.
WARNING
Unsafe Use of this machine may cause serious injury or
Death.Operators and maintenance personnel must read
this manual before operating or maintaining this machine.
This manual should be kept near the machine for
reference and periodically reviewed by all personnel
who will come into contact with it .
2001
and up
.
1-1
.
FOREWORD
FOREWORD
FOREWORD
This manual provides rules and guidelines which will help you use this machine safely and effectively. The
precautions in this manual must be followed at all times when performing operation and maintenance. Most
accidents are caused by the failure to follow fundamental safety rules for the operation and maintenance of
machines. Accidents can be prevented by knowing beforehand conditions that may cause a hazard when
performing operation and maintenance.
WARNING
Operators and maintenance personnel must always do as follows before beginning operation or maintenance.
Always be sure to read and understand this manual thoroughly before performing operation and maintenance.
Read the safety messages given in this manual and the safety labels affixed to the machine thoroughly and be sure that you
understand them fully.
Keep this manual in the storage location for the operation and maintenance manual given below, and have all personnel read it
periodically.
If this manual has been lost or has become dirty and cannot be read, request a replacement manual immediately from Komatsu
or your Komatsu distributor.
If you sell the machine, be sure to give this manual to the new owners together with the machine.
Komatsu delivers machines that comply with all applicable regulations and standards of the country to which it has been shipped.
If this machine has been purchased in another country or purchased from someone in another country, it may lack certain safety
devices and specifications that are necessary for use in your country. If there is any question about whether your product
complies with the applicable standards and regulations of your country, consult Komatsu or your Komatsu distributor before
operating the machine.
Storage location for the Operation and Maintenance Manual:
On inside of left door
1-2
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FOREWORD
FOREWORD
1-3
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FOREWORD
1-4
FOREWORD
.
FOREWORD
SAFETY INFORMATION
SAFETY INFORMATION
To enable you to use this machine safely, safety precautions and labels are given in this manual and affixed to the
machine to give explanations of situations involving potential hazards and of the methods of avoiding such
situations.
Signal words
The following signal words are used to inform you that there is a potential hazardous situation that may lead to
personal injury or damage.
In this manual and on machine labels, the following signal words are used to express the potential level of hazard.
Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury. This word is used also to alert against unsafe practices that may cause
property damage.
Example of safety message using signal word
WARNING
When standing up from the operator's seat, always place the lock lever in the LOCK position.
If you accidentally touch the control levers when they are not locked, this may cause a serious injury or death.
Other signal words
In addition to the above, the following signal words are used to indicate precautions that should be followed to
protect the machine or to give information that is useful to know.
This word is used for precautions that must be taken to avoid actions which could shorten
the life of the machine.
This word is used for information that is useful to know.
1-5
.
SAFETY INFORMATION
FOREWORD
Safety labels
Safety labels are affixed to the machine to inform the operator or maintenance worker on the spot when carrying out
operation or maintenance of the machine that may involve hazard.
This machine uses "Safety labels using words" and "Safety labels using pictograms" to indicate safety procedures.
Example of safety label using words
Safety labels using pictogram
Safety pictograms use a picture to express a level of hazardous
condition equivalent to the signal word. These safety pictograms
use pictures in order to let the operator or maintenance worker
understand the level and type of hazardous condition at all times.
Safety pictograms show the type of hazardous condition at the top
or left side, and the method of avoiding the hazardous condition at
the bottom or right side. In addition, the type of hazardous condition
is displayed inside a triangle and the method of avoiding the
hazardous condition is shown inside a circle.
Komatsu cannot predict every circumstance that might involve a potential hazard in operation and maintenance.
Therefore, the safety messages in this manual and on the machine may not include all possible safety precautions.
If any procedures or actions not specifically recommended or allowed in this manual are used, it is your responsibility
to take the necessary steps to ensure safety.
In no event should you engage in prohibited uses or actions described in this manual.
The explanations, values, and illustrations in this manual were prepared based on the latest information available
at that time. Continuing improvements in the design of this machine can lead to changes in detail which may not
be reflected in this manual. Consult Komatsu or your Komatsu distributor for the latest available information of your
machine or for questions regarding information in this manual.
The numbers in circles in the illustrations correspond to the numbers in ( ) in the text. (For example: 1 J (1))
1-6
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FOREWORD
INTENDED USE
INTENDED USE
DIRECTIONS OF MACHINE
In this manual, the directions of the machine (front, rear, left, right) are determined according to the view from the
operator's seat in the direction of travel (front) of the machine.
(A) FRONT
(B) REAR
(C) LEFT
(D) RIGHT
(E) OPERATOR'S SEAT
1-7
.
LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
FOREWORD
LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND
DISTRIBUTOR
When requesting service or ordering replacement parts, please inform your Komatsu distributor of the following
items.
PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE
This is at the rear right of the cab.
The design of the nameplate differs according to the territory.
EPA REGULATIONS, ENGINE NUMBER PLATE
It is located on the upper left side of the engine cylinder block if you look from the fan side.
EPA: Environmental Protection Agency, U.S.A.
1-8
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FOREWORD
LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
SERVICE METER POSITION
It is at the center bottom of the machine monitor.
TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
Machine serial No.
Engine serial No.
Product identification number (PIN)
Distributor name
Address
Service Personnel
Phone/Fax
1-9
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CONTENTS
FOREWORD
CONTENTS
FOREWORD
FOREWORD
SAFETY INFORMATION
INTENDED USE
DIRECTIONS OF MACHINE
LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE
EPA REGULATIONS, ENGINE NUMBER PLATE
SERVICE METER POSITION
TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
SAFETY
SAFETY
SAFETY LABELS
POSITION FOR ATTACHING SAFETY LABELS
SAFETY LABELS
GENERAL PRECAUTIONS
PRECAUTIONS DURING OPERATION
STARTING ENGINE
OPERATION
TRANSPORTATION
BATTERY
TOWING
PRECAUTIONS FOR MAINTENANCE
PRECAUTIONS WITH TIRES
OPERATION
GENERAL VIEW
GENERAL VIEW OF MACHINE
GENERAL VIEW OF CONTROLS AND GAUGES
EXPLANATION OF COMPONENTS
MACHINE MONITOR
OTHER FUNCTIONS OF MACHINE MONITOR
SWITCHES
CONTROL LEVERS AND PEDALS
BODY PIVOT PIN
ARTICULATE LOCK
LOCATION OF FIRE EXTINGUISHER
DUST INDICATOR
CIRCUIT BREAKER
FUSES
CAR RADIO
CAR STEREO
AIR CONDITIONER
OPERATION
CHECK BEFORE STARTING ENGINE
STARTING ENGINE
OPERATIONS, CHECKS AFTER STARTING ENGINE
STOPPING ENGINE
CHECKS AFTER STOPPING ENGINE
MOVING MACHINE OFF (FORWARD, REVERSE), STOPPING
1 - 10
1111111111222222222222223333333333333333333333333-
1
2
5
7
7
8
8
8
9
9
1
2
4
5
6
11
20
20
22
26
27
29
30
37
1
2
2
3
5
5
26
30
40
45
45
46
46
46
47
50
56
64
70
70
85
87
88
88
89
.
FOREWORD
SHIFTING GEAR
TRAVELING DOWNHILL
STEERING THE MACHINE
OPERATION USING DIFFERENTIAL LOCK
LOADING OPERATIONS
DUMP OPERATIONS
CAB TILT OPERATION
PRECAUTIONS FOR OPERATION
PARKING MACHINE
CHECKS AFTER COMPLETION OF WORK
LOCKING
HANDLING TIRES
DETERMINING AND MAINTAINING TRAVEL ROAD
DETERMINING TRAVEL ROAD
MAINTAINING TRAVEL ROAD
TRANSPORTATION
PRECAUTIONS WHEN TRANSPORTING
STEPS FOR TRANSPORTATION
METHOD OF SECURING MACHINE
METHOD OF LIFTING MACHINE
COLD WEATHER OPERATION
PRECAUTIONS FOR LOW TEMPERATURE
PRECAUTIONS AFTER COMPLETION OF WORK
AFTER COLD WEATHER
LONG-TERM STORAGE
BEFORE STORAGE
DURING STORAGE
AFTER STORAGE
PRECAUTIONS BEFORE TRAVELING AFTER LONG-TERM STORAGE
TROUBLESHOOTING
AFTER RUNNING OUT OF FUEL
IF TRANSMISSION HAS TROUBLE
METHOD OF LOWERING DUMP BODY IN EMERGENCY
METHOD OF TOWING MACHINE
IF BATTERY IS DISCHARGED
OTHER TROUBLE
MAINTENANCE
GUIDES TO MAINTENANCE
OUTLINE OF SERVICE
HANDLING OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC
OUTLINE OF ELECTRIC SYSTEM
WEAR PARTS
WEAR PARTS LIST
RECOMMENDED FUEL, COOLANT, AND LUBRICANT
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE
RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS OTHER THAN
KOMATSU GENUINE OIL
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
TORQUE LIST
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
CONTENTS
3- 94
3- 96
3-102
3-103
3-104
3-105
3-107
3-110
3-111
3-112
3-112
3-113
3-114
3-114
3-114
3-115
3-115
3-115
3-116
3-117
3-121
3-121
3-122
3-123
3-124
3-124
3-124
3-124
3-124
3-125
3-125
3-126
3-126
3-127
3-131
3-135
4- 1
4- 2
4- 4
4- 4
4- 8
4- 9
4- 9
4- 10
4- 11
4444-
12
13
13
15
1 - 11
.
CONTENTS
SAFETY CRITICAL PARTS
MAINTENANCE SCHEDULE CHART
MAINTENANCE SCHEDULE CHART
SERVICE PROCEDURE
INITIAL 250 HOURS SERVICE (ONLY AFTER THE FIRST 250 HOURS)
WHEN REQUIRED
CHECK BEFORE STARTING
EVERY 50 HOURS SERVICE
EVERY 250 HOURS SERVICE
EVERY 500 HOURS SERVICE
EVERY 1000 HOURS SERVICE
EVERY 2000 HOURS SERVICE
EVERY 4000 HOURS SERVICE
EVERY 6000 HOURS SERVICE
EVERY 8000 HOURS SERVICE
SPECIFICATIONS
SPECIFICATIONS
ATTACHMENTS, OPTIONS
HANDLING AUTOMATIC RETARDER, ACCELERATOR CONTROL(ARAC)
EXPLANATION OF COMPONENTS
METHOD OF OPERATION
USE OF REAR VIEW MONITOR
NAME AND FUNCTON OF EACH PART OF REAR VIEW MONITOR
SETTING OF REAR VIEW MONITOR
CAUTIONS WHEN USING REAR VIEW MONITOR
HANDLING DUMPING COUNTER
HANDLING MACHINES EQUIPPED WITH KOMTRAX
BASIC PRECAUTIONS
INDEX
1 - 12
FOREWORD
44444444444444455666666666667-
16
17
17
19
19
20
39
40
41
53
60
71
77
79
80
1
2
1
2
2
3
4
4
7
7
8
9
9
1
.
2-1
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SAFETY
SAFETY
SAFETY
SAFETY LABELS
POSITION FOR ATTACHING SAFETY LABELS
SAFETY LABELS
222-
4
5
6
GENERAL PRECAUTIONS
SAFETY RULES
IF ABNORMALITIES ARE FOUND
CLOTHING AND PERSONAL PROTECTIVE ITEMS
FIRE EXTINGUISHER AND FIRST AID KIT
SAFETY FEATURES
KEEP MACHINE CLEAN
INSIDE OPERATOR'S COMPARTMENT
ALWAYS APPLY LOCK WHEN LEAVING OPERATOR'S SEAT
HANDRAILS AND STEPS
MOUNTING AND DISMOUNTING
CRUSHING OR CUTTING PREVENTION
PREVENTION OF BURNS
FIRE PREVENTION
ACTION IF FIRE OCCURS
WINDOW WASHER LIQUID
PRECAUTIONS WHEN USING ROPS (Roll Over Protective Structure)
PRECAUTIONS FOR ATTACHMENTS, OPTIONS
UNAUTHORIZED MODIFICATION
SAFETY AT WORKSITE
WORKING ON LOOSE GROUND
DO NOT GO CLOSE TO HIGH-VOLTAGE CABLES
ENSURE GOOD VISIBILITY
PRECAUTIONS RELATED TO VENTILATION OF EXHAUST GAS
CHECKING SIGNALMAN'S SIGNALS AND SIGNS
EMERGENCY ESCAPE FROM OPERATOR'S CAB
ASBESTOS DUST HAZARD PREVENTION
222222222222222222222222222-
11
11
11
11
11
12
12
12
12
13
13
13
14
15
15
16
16
16
16
16
17
17
18
18
18
18
19
2-2
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SAFETY
SAFETY
PRECAUTIONS DURING OPERATION
STARTING ENGINE
CHECKS BEFORE STARTING ENGINE, ADJUST
PRECAUTIONS WHEN STARTING
PRECAUTIONS IN COLD AREAS
OPERATION
CHECKS BEFORE STARTING OPERATION
PRECAUTIONS WHEN TRAVELING IN FORWARD OR REVERSE
PRECAUTIONS WHEN TRAVELING
PRECAUTIONS WHEN TRAVELING ON SLOPES
PRECAUTIONS WHEN OPERATING DUMP BODY
PRECAUTIONS WHEN OPERATING
PRECAUTIONS FOR ACCUMULATED SNOW, ICE
PARKING MACHINE
TRANSPORTATION
LOADING AND UNLOADING
SHIPPING
BATTERY
BATTERY HAZARD PREVENTION
STARTING WITH BOOSTER CABLES
TOWING
WHEN TOWING
2222222222222222222222-
20
20
20
20
21
22
22
22
23
23
24
24
24
25
26
26
26
27
27
28
29
29
PRECAUTIONS FOR MAINTENANCE
WARNING TAG
KEEP WORK PLACE CLEAN AND TIDY
APPOINT LEADER WHEN WORKING WITH OTHERS
STOP ENGINE BEFORE CARRYING OUT INSPECTION AND MAINTENANCE
TWO WORKERS FOR MAINTENANCE WHEN ENGINE IS RUNNING
PROPER TOOLS
HANDLING SUSPENSION CYLINDER, ACCUMULATOR
PERSONNEL
WORK UNDER THE MACHINE
NOISE
PRECAUTIONS WHEN USING HAMMER
REPAIR WELDING
REMOVING BATTERY TERMINAL
PRECAUTIONS WITH HIGH-PRESSURE OIL
PRECAUTIONS FOR HIGH-PRESSURE FUEL
HANDLING HIGH-PRESSURE HOSES, PIPING
PRECAUTIONS FOR HIGH VOLTAGE
WASTE MATERIALS
MAINTENANCE OF AIR CONDITIONER
COMPRESSED AIR
PERIODIC REPLACEMENT OF SAFETY-CRITICAL PARTS
2222222222222222222222-
30
30
30
30
31
32
33
33
33
33
33
34
34
34
34
34
35
35
35
35
35
36
PRECAUTIONS WITH TIRES
HANDLING TIRES
PRECAUTIONS WHEN STORING TIRE
2- 37
2- 37
2- 37
2-3
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SAFETY LABELS
SAFETY
SAFETY LABELS
The following warning signs and safety labels are used on this machine.
Be sure that you fully understand the correct position and content of labels.
To ensure that the content of labels can be read properly, be sure that they are in the correct place and always
keep them clean. When cleaning them, do not use organic solvents or gasoline. These may cause the labels to
peel off.
There are also other labels in addition to the warning signs and safety labels. Handle those labels in the same
way.
If the labels are damaged, lost, or cannot be read properly, replace them with new ones. For details of the part
numbers for the labels, see this manual or the actual label, and place an order with Komatsu distributor.
2-4
.
SAFETY
SAFETY LABELS
POSITION FOR ATTACHING SAFETY LABELS
2-5
.
SAFETY LABELS
SAFETY LABELS
(1) Caution for modification of ROPS/FOPS (09620-A2000)
(2) Caution for checking engine room (09667-A0880)
(3) Caution when releasing radiator cap (09653-A0641)
(4) Caution when releasing hydraulic tank cap (09653-A0641)
2-6
SAFETY
.
SAFETY
SAFETY LABELS
(5) Caution when handling suspension (09659-A0641)
(6) Caution for handling accumulator (09659-A057B)
(7) Warnings for electric wire
Warnings for crush hazard when inspection and maintenance
(56B-93-12980)
2-7
.
SAFETY LABELS
(8) Cautions before starting
Cautions when traveling in reverse
(569-93-61720)
(9) Caution when handling battery cable (09808-A1681)
(10) Exhaust pipe is hot! (09817-A1103)
2-8
SAFETY
.
SAFETY
SAFETY LABELS
(11) Prohibited to enter (09162-C0881)
(12) Cation for articulate lock (09161-C0881)
(13)Precautions when handling battery
(The battery manufacturer sticks this caution plate on the
battery. )
2-9
.
SAFETY LABELS
(14) Caution for parking brake
(This plate is fixed in position by the chamber maker)
(15) Prohibited to jump start (09842-A0481)
(This plate is fixed to the starting motor)
2 - 10
SAFETY
.
SAFETY
GENERAL PRECAUTIONS
GENERAL PRECAUTIONS
SAFETY RULES
Only trained and authorized personnel can operate and maintain the machine.
Follow all safety rules, precautions and instructions in this manual when operating or performing maintenance on
the machine.
If you are not feeling well, or if you are under the influence of alcohol or medication, your ability to safely operate
or repair your machine may be severely impaired, putting yourself and everyone else on your job site in danger.
When working with another operator or with the person on the worksite traffic duty, discuss the content of the
operation beforehand and use the determined signals when carrying out the operation.
IF PROBLEMS ARE FOUND
If you find any problems in the machine during operation or maintenance (noise, vibration, smell, incorrect gauges,
smoke, oil leakage, etc., or any abnormal display on the warning devices or monitor), report to the person in charge
and have the necessary action taken. Do not operate the machine until the problem has been corrected.
CLOTHING AND PERSONAL PROTECTIVE ITEMS
Do not wear loose clothing and accessories. There is a hazard that they may catch on dump lever or other
protruding parts.
If you have long hair and it hangs out from your hard hat, there
is a hazard that it may get caught up in the machine, so tie your
hair up and be careful not to let it get caught.
Always wear a hard hat and safety shoes. If the nature of the
work requires it, wear safety glasses, mask, gloves, ear plugs,
and safety belt when operating or maintaining the machine.
Check that all protective equipment functions properly before
using it.
FIRE EXTINGUISHER AND FIRST AID KIT
Always follow the precautions below to prepare for action if any injury or fire should occur.
Be sure that fire extinguishers have been provided and read the
labels to ensure that you know how to use them in emergencies.
Carry out periodic inspection and maintenance to ensure that
the fire extinguisher can always be used.
Provide a first aid kit in the storage point. Carry out periodic
checks and add to the contents if necessary.
2 - 11
.
GENERAL PRECAUTIONS
SAFETY
SAFETY FEATURES
Be sure that all guards, covers and mirrors are in their proper position. Have guards and covers repaired
immediately if they are damaged.
Understand the method of use of safety features and use them properly.
Never remove any safety features. Always keep them in good operating condition.
KEEP MACHINE CLEAN
If water gets into the electrical system, there is a hazard that it will cause malfunctions or misoperation. Do not
use water or steam to wash the electrical system (sensors, connectors).
If inspection and maintenance is carried out when the machine
is still dirty with mud or oil, there is a hazard that you will slip and
fall, or that dirt or mud will get into your eyes. Always keep the
machine clean.
INSIDE OPERATOR'S COMPARTMENT
When entering the operator's compartment, always remove all mud and oil from the soles of your shoes.
If you operate the pedal with mud or oil affixed to your shoes, your foot may slip and this may cause a serious
accident.
Do not leave parts or tools lying around the operator's compartment.
Do not stick suction pads to the window glass. Suction pads act as a lens and may cause fire.
Do not use cellular telephones inside the operator's compartment when driving or operating the machine.
Never bring any dangerous objects such as flammable or explosive items into the operator's compartment.
ALWAYS APPLY LOCK WHEN LEAVING OPERATOR'S SEAT
Before adjusting or standing up from the operator's seat, always set shift lever (1) to the N position and parking
brake switch (2) to the PARKING position, then stop the engine.
If the gear shift lever or dump lever are touched by mistake, there is danger that the machine may suddenly move
and cause serious personal injury or damage.
When leaving the machine, always place shift lever (1) at neutral
and set parking brake switch (2) to the PARKING position.
Lower the dump body, set the dump lever to the HOLD position,
and lock with the dump lever lock knob. Apply all the locks and
always remember to take the key with you and keep it in the
fixed place.
2 - 12
.
SAFETY
GENERAL PRECAUTIONS
HANDRAILS AND STEPS
To prevent personal injury caused by slipping or falling off the machine, always do as follows.
Use the parts marked by arrows in the diagram when getting on
or off the machine.
A: For getting on or off machine using left door
B: For getting on or off machine using right door
To ensure safety, always face the machine and maintain
three-point contact (both feet and one hand, or both hands and
one foot) with the handrails and steps to ensure that you support
yourself.
Do not grip the dump lever when getting on or off the machine.
Never climb on the engine hood or covers where there are no
non-slip pads.
Before getting on or off the machine, check the handrails and
steps, and if there is any oil, grease, or mud on them, wipe it off
immediately. In addition, repair any damage and tighten any
loose bolts.
Do not get on or off the machine while holding tools in your hand.
MOUNTING AND DISMOUNTING
Never jump on or off the machine. Never get on or off a moving machine.
If the machine starts to move when there is no operator on the machine, do not jump on to the machine and try
to stop it.
CRUSHING OR CUTTING PREVENTION
If the clearance at the articulating portion changes, it will lead to serious personal injury.
Do not allow anyone to come inside the articulation range.
The clearance in the area around the dump body changes according to the movement of the dump body. If you
are caught, you will suffer serious injury. Do not allow anyone near any of the rotating or telescoping parts.
2 - 13
.
GENERAL PRECAUTIONS
PREVENTION OF BURNS
Hot coolant
To prevent burns from hot water or steam spurting out when
checking or draining the coolant, wait for the water to cool to a
temperature where it is possible to touch the radiator cap by
hand before starting the operation. Even when the coolant has
cooled down, loosen the cap slowly to relieve the pressure
inside the radiator before removing the cap.
Hot oil
To prevent burns from hot oil spurting out when checking or
draining the oil, wait for the oil to cool to a temperature where it
is possible to touch the cap or plug by hand before starting the
operation. Even when the oil has cooled down, loosen the cap
or plug slowly to relieve the internal pressure before removing
the cap or plug.
2 - 14
SAFETY
.
SAFETY
GENERAL PRECAUTIONS
FIRE PREVENTION
Fire caused by fuel or oil
Fuel, oil, antifreeze, and window washer liquid are particularly
flammable and can be hazardous. To prevent fire, always
observe the following:
Do not smoke or use any flame near fuel or oil.
Stop the engine before refueling.
Do not leave the machine while adding fuel or oil.
Tighten all fuel and oil caps securely.
Do not spill fuel on overheated surfaces or on parts of the
electrical system.
Use well-ventilated areas for adding or storing oil and fuel.
Keep oil and fuel in the determined place and do not allow
unauthorized persons to enter.
After adding fuel or oil, wipe up any spilled fuel or oil.
When carrying out grinding or welding work on the chassis,
move any flammable materials to a safe place before
starting.
When washing parts with oil, use a non-flammable oil. Diesel
oil and gasoline may catch fire, so do not use them.
Put greasy rags and other flammable materials into a safe
container to maintain safety at the work place.
Do not weld or use a cutting torch to cut any pipes or tubes
that contain flammable liquids.
Fire caused by accumulation of flammable material.
Remove any dry leaves, chips, pieces of paper, dust, or any other flammable materials accumulated or affixed
around the engine, exhaust manifold, muffler, or battery, or inside the undercovers.
Fire coming from electric wiring
Short circuits in the electrical system can cause fire.
Always keep electric wiring connections clean and securely tightened.
Check the wiring every day for looseness or damage. Tighten any loose connectors or wiring clamps. Repair
or replace any damaged wiring.
Fire coming from hydraulic line
Check that all the hose and tube clamps, guards, and cushions are securely fixed in position.
If they are loose, they may vibrate during operation and rub against other parts. This may lead to damage to the
hoses, and cause high-pressure oil to spurt out, leading to fire damage or serious injury.
Explosion caused by lighting equipment
When checking fuel, oil, battery electrolyte, window washer fluid, or coolant, always use lighting with
anti-explosion specifications. If such lighting equipment is not used, there is danger of explosion that may
cause serious injury.
When taking the electrical power for the lighting from the machine itself, follow the instructions in this manual.
ACTION IF FIRE OCCURS
If a fire occurs, escape from the machine as follows.
Turn the start switch OFF to stop the engine.
Use the handrails and steps to get off the machine.
2 - 15
.
GENERAL PRECAUTIONS
SAFETY
WINDOW WASHER LIQUID
Use an ethyl alcohol base washer liquid.
Methyl alcohol base washer liquid may irritate your eyes, so do not use it.
PRECAUTIONS WHEN USING ROPS (Roll Over Protective Structure)
The operator's cab has a ROPS structure. In addition to supporting
of the load if the machine tips over, it also absorbs the impact
energy and protects the operator. If the function of ROPS is
reduced, it cannot protect the operator and he may be injured.
Always do the following.
Do not weld, drill holes, or make any other modification to the
operator's cab structure.
Repair or replace the operator's cab if it is deformed by falling
objects or when the machine tips over. For details of repair,
please consult your Komatsu distributor.
Even when the ROPS is installed, if you do not fasten your seat belt
securely, it cannot protect you properly. Always fasten your seat
belt when operating the machine.
PRECAUTIONS FOR ATTACHMENTS, OPTIONS
When installing optional parts or attachments, there may be problems with safety or legal restrictions. Therefore
contact your Komatsu distributor for advice.
Any injuries, accidents, product failures or other property damages resulting from the use of unauthorized
attachments or parts will not be the responsibility of Komatsu.
Always read the instruction manual for the attachment.
UNAUTHORIZED MODIFICATION
If this machine is modified without permission from Komatsu, there is danger that problems may occur with safety
and that this may lead to serious personal injury. Modifications may have an adverse effect on items such as
machine strength and visibility. Before making any modifications, please consult your Komatsu distributor.
Komatsu cannot take any responsibility for accidents, failures, or damage caused by modifications not authorized
by Komatsu.
SAFETY AT WORKSITE
Before starting operations, thoroughly check the area for any unusual conditions that could be dangerous.
Check the terrain and condition of the ground at the worksite, and determine the safest method of operation. Do
not operate where there is a hazard of landslides or falling rocks.
Take necessary measures to prevent any unauthorized person from entering the operating area.
When traveling or operating in shallow water or on soft ground, check the shape and condition of the bedrock, and
the depth and speed of flow of the water before starting operations.
Always design and maintain the roads on the jobsite so that the machines can travel safely.
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SAFETY
GENERAL PRECAUTIONS
WORKING ON LOOSE GROUND
Avoid traveling or operating your machine too close to the edge of cliffs, overhangs, and deep ditches. The
ground may be weak in such areas. If the ground should collapse under the weight or vibration of the machine,
there is a hazard that the machine may fall or tip over. Remember that the soil after heavy rain or blasting or after
earthquakes is weak in these areas.
When working on embankments or near excavated ditches, there is a hazard that the weight and vibration of the
machine will cause the soil to collapse. Before starting operations, take steps to ensure that the ground is safe
and to prevent the machine from rolling over or falling.
DO NOT GO CLOSE TO HIGH-VOLTAGE CABLES
Do not travel or operate the machine near electric cables. There is
a hazard of electric shock, which may cause serious personal
injury or death. On jobsites where the machine may go close to
electric cables, always do as follows.
Before starting work near electric cables, inform the local power
company of the work to be performed, and ask them to take the
necessary action.
Even going close to high-voltage cables can cause electric
Voltage of Cables
Safety Distance
shock, which may cause serious burns or even death. Always
100 V - 200 V
Over 2 m (7 ft)
maintain a safe distance (see the table on the right) between the
6,600 V
Over 2 m (7 ft)
machine and the electric cable. Check with the local power
company about safe operating procedure before starting
22,000 V
Over 3 m (10 ft)
operations.
66,000 V
Over 4 m (14 ft)
To prepare for any possible emergencies, wear rubber shoes
154,000 V
Over 5 m (17 ft)
and gloves. Lay a rubber sheet on top of the seat, and be careful
187,000 V
Over 6 m (20 ft)
not to touch the chassis with any exposed part of your body.
275,000 V
Over 7 m (23 ft)
Use a signalman to give warning if the machine approaches too
500,000 V
Over 11 m (36 ft)
close to the electric cables.
When carrying out operations near high voltage cables, do not
let anyone near the machine.
If the machine should come too close or touch the electric cable, to prevent electric shock, the operator should
not leave the operator's compartment until it has been confirmed that the electricity has been shut off.
Also, do not let anyone near the machine.
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GENERAL PRECAUTIONS
SAFETY
ENSURE GOOD VISIBILITY
This machine is equipped with mirrors to improve the visibility, but even with mirrors, there are places, which cannot
be seen from the operator's seat, so always be careful when operating.
When operating or traveling in places with poor visibility, if it is impossible to confirm the condition of the job side or
obstacle is in the area around the machine, there is danger that the machine may suffer damage or the operator may
suffer serious personal injury. When operating or traveling in places with poor visibility, always observe the following
items strictly.
If the visibility cannot be sufficiently assured, position a flagman if necessary. The operator should pay careful
attention to the signs and follow the instructions of the flagman.
The signals should be given only by one flagman.
When working in dark places, turn on the working lamps and front lamps of the machine, and if necessary, set
up additional lighting in the area.
Stop operations if there is poor visibility, such as in fog, snow, rain, or sand storms.
Check the mirrors on the machine before starting operations every day. Clean off any dirt and adjust the view
to ensure good visibility.
In areas where it is impossible to confirm the area behind the machine and observation cameras have been set
up, clean off any dirt from the lens and make sure that the camera gives a clear view of the rear.
PRECAUTIONS RELATED TO VENTILATION OF EXHAUST GAS
The engine exhaust gas contains substances that may damage
your health or even cause death. Start or operate the engine in a
place where there is good ventilation. If the engine or machine
must be operated inside a building or under ground, where the
ventilation is poor, take steps to ensure that the engine exhaust
gas is removed and that ample fresh air is brought in.
CHECKING SIGNALMAN'S SIGNALS AND SIGNS
Set up signs to inform of road shoulders and soft ground. If the visibility is not good, position a signalman if
necessary. Operators should pay careful attention to the signs and follow the instructions from the signalman.
Only one signalman should give signals.
Make sure that all workers understand the meaning of all signals and signs before starting work.
EMERGENCY ESCAPE FROM OPERATOR'S CAB
The cab installed on this machine has doors on the left and right sides. If the door on one side does not open,
escape through the door on the other side.
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SAFETY
GENERAL PRECAUTIONS
ASBESTOS DUST HAZARD PREVENTION
Asbestos dust in the air can cause lung cancer if it is inhaled. There
is danger of inhaling asbestos when working on jobsites handling
demolition work or work handling industrial waste. Always observe
the following.
Spray water to keep down the dust when cleaning. Do not use
compressed air for cleaning.
If there is danger that there may be asbestos dust in the air,
always operate the machine from an upwind position. All
workers should use an approved respirator.
Do not allow other persons to approach during the operation.
Always observe the rules and regulations for the work site and environmental standards.
This machine does not use asbestos, but there is a danger that imitation parts may contain asbestos, so always use
genuine Komatsu parts.
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PRECAUTIONS DURING OPERATION
SAFETY
PRECAUTIONS DURING OPERATION
STARTING ENGINE
If there is a warning tag hanging from the shift lever, do not start the
engine or touch the levers.
CHECKS BEFORE STARTING ENGINE, ADJUST
Carry out the following checks before starting the engine at the beginning of the day's work.
Remove all dirt from the surface of the window glass to ensure a good view.
Remove all dirt from the surface of the lens of the front lamps, working lamps, and rear combination lamp, and
check that they light up correctly.
Check the coolant level, fuel level, and oil level in engine oil pan, check for clogging of the air cleaner, and check
for damage to the electric wiring.
Check that there is no mud or dust accumulated around the movable parts of the accelerator pedal or brake pedal,
and check that the pedals work properly.
Adjust the operator's seat to a position where it is easy to carry out operations, and check that there is no damage
or wear to the seat belt or mounting clamps.
Check that the gauges and instruments work properly, check the angle of the mirror, and check that the gearshift
lever is at neutral and the dump lever is at HOLD.
Before starting the engine, make sure that the dump lever lock knob is in the LOCK position.
Adjust the mirrors so that the rear of the machine can be seen clearly from the operator's seat.
Refer to "WALK-AROUND CHECK (PAGE 3-70)".
Check that there are no persons or obstacles above, below, or in the area around the machine.
Check that the parking brake switch is in the PARKING position.
PRECAUTIONS WHEN STARTING
Start and operate the machine only while seated.
Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may cause a serious
bodily injury or fire.
When starting the engine, sound the horn as a warning.
If another person is allowed on the machine, that person may sit only in the assistant's seat.
For machines equipped with a backup alarm, check that the warning device works properly.
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SAFETY
PRECAUTIONS DURING OPERATION
PRECAUTIONS IN COLD AREAS
Carry out the warming-up operation thoroughly. If the machine is not thoroughly warmed up before the gear shift
lever or dump lever are operated, the reaction of the machine will be slow or may change suddenly, and this may
cause an accident.
If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power source.
There is a hazard that this will ignite the battery and cause the battery to explode.
Before charging or starting the engine with a different power source, melt the battery electrolyte and check that
there is no leakage of electrolyte before starting.
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PRECAUTIONS DURING OPERATION
SAFETY
OPERATION
CHECKS BEFORE STARTING OPERATION
When carrying out the checks, move the machine to a wide area where there are no obstructions, and operate
slowly. Do not allow anyone near the machine.
Always fasten your seat belt.
Check the operation of the steering, travel, and brake systems.
Check for any problem in the sound of the machine, vibration, heat, smell, or gauges; check also that there is no
leakage of oil or fuel.
If any problem is found, carry out repairs immediately.
Before traveling or carrying out operations, check that
articulation lock (1) is securely at the FREE position.
PRECAUTIONS WHEN TRAVELING IN FORWARD OR REVERSE
Before travelling, check again that there is no one in the
surrounding area, and that there are no obstacles.
Before travelling, sound the horn to warn people in the area.
Always operate the machine only when seated.
If another person is allowed on the machine, that person may sit
only in the assistant's seat.
Check that the backup alarm (backup warning buzzer) works
properly.
Always close the door and the window of the operator's
compartment and check that the door lock is applied.
If there is an area to the rear of the machine which cannot be
seen, position a signal person. Take special care not to hit other
machines or people when turning or swinging the machine.
Always be sure to carry out the above precautions even when the
machine is equipped with mirrors.
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SAFETY
PRECAUTIONS DURING OPERATION
PRECAUTIONS WHEN TRAVELING
Do not load the dump body above the maximum payload. The brakes will lose their effect.
Never turn the starting switch to the OFF position. It is dangerous if the engine stops when the machine is
traveling, because the steering becomes heavy.
Lower the dump body, setting the dump lever at FLOAT position, then travel.
Never transport anyone riding on the body or carry out any other operation besides the main use for the machine.
This is dangerous.
When traveling on rough ground, travel at low speed and avoid sudden changes in direction to prevent the
machine from turning over.
When traveling or carrying out operations, always keep a safe distance from people, structures, or other
machines to avoid coming into contact with them.
When passing over bridges or structures, check first that the structure is strong enough to support the weight of
the machine.
When operating in tunnels, inside buildings, or under bridges or electric wires, or other places where the height
is limited, operate slowly and be extremely careful not to let the machine or dump body contact anything.
Continuous long time traveling at high speed may cause tires to heat up, abnormally increasing the inflation
pressure inside the tires, and to blow up. The explosion of the tire is very destructive, and it can lead to serious
injury or death.
Contact with your Komatsu distributor before doing long continuous traveling.
Do not move the gear shift lever to the N position when the machine is traveling or when it is traveling down a
slope. Always place the transmission in gear before traveling.
If the transmission is in Neutral, the engine cannot provide any braking effect and the steering wheel will
become heavier. In addition, there will be lack of cooling oil for the retarder, so there is danger that it will
overheat or that the actuation of the brake will be poor.
There may also be damage to the transmission or other parts of the power train, and there is danger of
unexpected accidents.
PRECAUTIONS WHEN TRAVELING ON SLOPES
To prevent the machine from tipping over or slipping to the side, always do as follows.
When traveling downhill, use the retarder brake to reduce speed. Do not turn the steering wheel suddenly.
Travel on grass, fallen leaves, or wet steel plates with low speed. Even with slight slopes there is a hazard that
the machine may slip.
If the engine should stop on a slope, apply the brakes fully and apply the parking brake also to stop the machine.
Do not shift gear while traveling downhill or travel downhill with the transmission in neutral.
It is dangerous if the engine has no braking effect. Always set the transmission to a lower gear before starting
to travel downhill.
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PRECAUTIONS DURING OPERATION
SAFETY
PRECAUTIONS WHEN OPERATING DUMP BODY
Before starting the dumping operation, check to be sure there is no person or object behind the machine.
Stop the machine in the correct position, and check again that there is no person or object behind the machine.
Give the determined signal, then slowly operate the dump body.
If necessary, use blocks for the wheels or position a flagman.
Do not carry out dumping operations on slopes. The machine stability will become poor and there is the danger
that it could tip over.
Do not travel with the body raised.
Do not leave or return to the operator's seat during loading work.
When carrying out dumping operations, set the machine facing straight forward. If dumping operations are
carried out with the machine articulated, the stability of the machine will be reduced and there is danger that it may
tip over.
When the dump body is raised, the center of gravity of the machine moves continuously. At this time, if the ground
is soft, the stability of the machine changes. Take care.
Take care particularly when dumping sticky material (wet clay, frozen material, etc.) on a soft ground. The stability
of the machine is reduced and there is danger that it may tip over.
PRECAUTIONS WHEN OPERATING
When using the machine, to prevent the machine from overturning due to overloading and to avoid damage to the
dump body, do not exceed the performance or maximum load specified for the machine structure.
When operating in tunnels, or under bridges or electric wires, or in other places where the height is limited,
operate slowly and be extremely careful not to let the dump body contact anything.
To prevent accidents caused by hitting other objects, always operate the machine at a speed which is safe for
operation, particular in confined spaces, indoors, and in places where there are other machines.
PRECAUTIONS FOR ACCUMULATED SNOW, ICE
Snow-covered or frozen surfaces are slippery, so be extremely careful when traveling or operating the machine,
and do not operate the levers suddenly. Even a slight slope may cause the machine to slip, so be particularly
careful when working on slopes.
With frozen ground surfaces, the ground becomes soft when the temperature rises, and this may cause the
machine to tip over or make it impossible for the machine to escape.
If the machine enters deep snow, there is a hazard that it may tip over or become buried in the snow. Be careful
not to leave the road shoulder or to get trapped in a snow drift.
When traveling on snow-covered roads, always fit tire chains.
When traveling on snow-covered roads, never use the foot brake to make sudden stops. Shift down to use the
engine brake and carry out double braking (depress the brake pedal several times) to stop the machine.
When the loaded materials in the dump body are frozen, do not dump. There is a danger that the machine could
tip over.
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SAFETY
PRECAUTIONS DURING OPERATION
PARKING MACHINE
Park the machine on firm, level ground.
Select a place where there is no hazard of landslides, falling
rocks, or flooding.
When leaving the machine, always place shift lever (1) at neutral
and set parking brake switch (2) to the PARKING position.
Lower the dump body, set the dump lever to the HOLD position,
lock with the dump lever lock knob, then stop the engine.
Always close the operator's cab door, and use the key to lock all
the equipment in order to prevent any unauthorized person from
moving the machine. Always remove the key, take it with you,
and leave it in the specified place.
If it is necessary to park the machine on a slope, set blocks
under the wheels to prevent the machine from moving.
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PRECAUTIONS DURING OPERATION
SAFETY
TRANSPORTATION
This machine must be disassembled for transportation. When transporting the machine, please consult your
Komatsu distributor.
LOADING AND UNLOADING
When loading or unloading the machine, mistaken operation may
bring the hazard of the machine tipping over or falling, so particular
care is necessary. Always do as follows.
Perform loading and unloading on firm, level ground only.
Maintain a safe distance from the edge of the road or cliff.
Always use ramps of adequate strength. Be sure that the ramps
are wide, long, and thick enough to provide a safe loading slope.
Take suitable steps to prevent the ramps from moving out of
position or coming off.
Be sure the ramp surface is clean and free of grease, oil, ice and
loose materials. Remove dirt from machine-tracks. On a rainy
day, in particular, be extremely careful since the ramp surface is
slippery.
Run the engine at low speed, drive the machine at low speed, and operate slowly.
Never correct your steering on the ramps. If necessary, drive off the ramps, correct the direction, then enter the
ramps again.
When loading or unloading to an embankment or platform, make sure that it has suitable width, strength, and
grade.
After loading the machine, always lock the door. There is danger that the door may open during transportation.
For details, see "TRANSPORTATION (PAGE 3-115)".
SHIPPING
When shipping the machine on a trailer, do as follows.
The weight, transportation height, and overall length of the machine differ according to the attachment, so be sure
to confirm the dimensions.
When passing over bridges or structures on private land, check first that the structure is strong enough to support
the weight of the machine. When traveling on public roads, check first with the relevant authorities and follow their
instructions.
Lock the articulation lock to prevent the machine from articulating.
For details of the transportation procedure, see "TRANSPORTATION (PAGE 3-115)" in the Operation Section.
2 - 26
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SAFETY
PRECAUTIONS DURING OPERATION
BATTERY
BATTERY HAZARD PREVENTION
Battery electrolyte contains sulphuric acid, and batteries generate flammable hydrogen gas, which may explode.
Mistaken handling can lead to serious injury or fire. For this reason, always observe the following precautions.
Do not use or charge the battery if the battery electrolyte level is below the LOWER LEVEL line. This may cause
an explosion. Check the battery electrolyte level periodically and add distilled water to bring the electrolyte level
to the UPPER LEVEL line.
When working with batteries, always wear safety glasses and rubber gloves.
Never smoke or use any flame near the battery.
If you spill acid on your clothes or skin, immediately flush the
area with large amount of water.
If acid gets into your eyes, flush them immediately with large
amount of water and seek medical attention.
Before working with batteries, turn the starting switch to the OFF position.
As there is a hazard that sparks will be generated, always do as follows.
Do not let tools or other metal objects make any contact between the battery terminals. Do not leave tools or other
metal objects lying around near the battery.
Always disconnect the negative (-) terminal (ground side) first when removing the battery; when installing the
battery, connect the positive (+) terminal first, and connect the ground last. Tighten the battery terminals securely.
Flammable hydrogen gas is generated when the battery is charged, so remove the battery from the chassis, take
it to a well-ventilated place, and remove the battery caps before charging it.
Tighten the battery caps securely.
Install the battery securely to the determined place.
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PRECAUTIONS DURING OPERATION
STARTING WITH BOOSTER CABLES
If any mistake is made in the method of connecting the booster
cables, it may cause the battery to explode, so always do as
follows.
When starting with a booster cable, carry out the starting
operation with two workers (one worker sitting in the operator's
seat and the other working with the battery).
When starting from another machine, do not allow the two
machines to touch.
When connecting the booster cables, turn the starting switch
OFF position for both the normal machine and problem
machine. There is a hazard that the machine will move when the
power is connected.
Be sure to connect the positive (+) cable first when installing the
booster cables. Disconnect the negative (-) cable (ground side)
first when removing them.
When removing the booster cables, be careful not to let the
booster cable clips touch each other or to let the clips touch the
machine.
Always wear safety glasses and rubber gloves when starting the
engine with booster cables.
When connecting a normal machine to a problem machine with
booster cables, always use a normal machine with the same
battery voltage as the problem machine.
For details of the starting procedure when using booster cables,
see "STARTING ENGINE WITH BOOSTER CABLE (PAGE
3-133)" in the OPERATION section.
2 - 28
SAFETY
.
SAFETY
PRECAUTIONS DURING OPERATION
TOWING
WHEN TOWING
When towing or being towed, mistakes in the method of selecting and inspecting the wire rope or drawbar, or in the
method of towing may lead to serious personal injury.
For details of the procedure for towing, see the "METHOD OF TOWING MACHINE (PAGE 3-127)"
Always confirm that the wire rope or drawbar used for towing
has ample strength for the weight of the machine being towed.
Never use a wire rope which has cut strands (A), reduced
diameter (B), or kinks (C). There is danger that the rope may
break during the towing operation.
Always wear leather gloves when handling wire rope.
Never tow a machine on a slope.
During the towing operation, never stand between the towing
machine and the machine being towed.
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PRECAUTIONS FOR MAINTENANCE
SAFETY
PRECAUTIONS FOR MAINTENANCE
WARNING TAG
Attach the DO NOT OPERATE warning tag to shift lever in the
operator's cab during the inspection and maintenance. Attach
additional warning tags around the machine if necessary.
Warning tag Part No. 09963-03001
Keep the warning tag in the tool box when it is not used. If the
tool box is unavailable, keep it in the case for operation manual.
If any person other than the serviceman starts the engine, or
touches or operates the gear shift lever or dump lever while the
serviceman is carrying out service or maintenance of the
machine, it may lead to serious injury.
KEEP WORK PLACE CLEAN AND TIDY
Do not leave hammers or other tools lying around in the work place. Wipe up all grease, oil, or other substances
that will cause you to slip. Always keep the work place clean and tidy to enable you to carry out operations safely.
If the work place is not kept claen and tidy, there is the danger that you will trip, slip, or fall over and injure yourself.
APPOINT LEADER WHEN WORKING WITH OTHERS
When repairing the machine or when removing and installing the attachment, appoint a leader and follow his
instructions during the operation.
When working with others, misunderstandings between workers can lead to serious accidents.
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SAFETY
PRECAUTIONS FOR MAINTENANCE
STOP ENGINE BEFORE CARRYING OUT INSPECTION AND MAINTENANCE
Stop the machine on firm, level ground.
Select a place where there is no hazard of landslides, falling
rocks, or flooding.
Lower the dump body, set dump lever (1) to the HOLD position,
lock with dump lever lock knob (2), then stop the engine.
Set parking brake switch to the PARKING position and put
blocks (3) under the tires to prevent the machine from moving.
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PRECAUTIONS FOR MAINTENANCE
SAFETY
Lock with articulation lock (4) so that the machine that does not
articulate.
TWO WORKERS FOR MAINTENANCE WHEN ENGINE IS RUNNING
To prevent personal injury, do not carry out maintenance with the
engine running. If maintenance must be carried out with the engine
running, carry out the operation with at least two workers and do as
follows.
One worker must always sit in the operator's seat and be ready
to stop the engine at any time. All workers must maintain
contact with the other workers.
Set dump lever (1) to the HOLD position, lock with dump lever
lock knob (2), then set parking brake switch (3) to the PARKING
position.
When carrying out operations near the fan, fan belt, or other rotating parts, there is a hazard of being caught in
the parts, so be careful not to come close.
Do not touch the gear shift lever or dump lever. If the gear shift lever or dump lever must be operated, give a signal
to the other workers to warn them to move to a safe place.
Never drop or insert tools or other objects into the fan or fan belt. Parts may break or be sent flying.
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SAFETY
PRECAUTIONS FOR MAINTENANCE
PROPER TOOLS
Use only tools suited to the task and be sure to use the tools
correctly. Using damaged, low quality, faulty, makeshift tools or
improper use of the tools could cause serious personal injury.
HANDLING SUSPENSION CYLINDER, ACCUMULATOR
The suspension cylinders and accumulator are charged with high-pressure nitrogen gas. If any mistake is made in
handling, it may cause serious personal injury. To prevent this, always follow the procedure below.
Do not remove or disassemble the cylinder.
Do not bring it near flame or dispose of it in fire.
Do not make holes in it, weld it, or use a cutting torch.
Do not bear any shock by hammering, rolling or similar activity.
Ask for your Komatsu distributor when sealing gas into the cylinder or releasing gas from it.
PERSONNEL
Do not allow any unauthorized personnel into the area when servicing the machine. If necessary, employ a guard.
WORK UNDER THE MACHINE
If it is necessary to go under the machine when it is raised in
order to carry out service or maintenance, support the machine
securely with blocks and stands strong enough to support the
weight of the machine.
When carrying out inspection of the machine with the dump
body raised, always set the dump lever to the HOLD position,
lock with the dump lever lock knob, then use the body pivot pin.
For details of using the body pivot pin, see "BODY PIVOT PIN
(PAGE 3-45)".
NOISE
When carrying out maintenance of the engine and you are exposed to noise for long periods of time, wear ear covers
or ear plugs while working.
If the noise from the machine is too loud, it may cause temporary or permanent hearing problems.
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PRECAUTIONS FOR MAINTENANCE
SAFETY
PRECAUTIONS WHEN USING HAMMER
When using a hammer, pins may fly out or metal particles may be
scattered. This may lead to serious injury. Always do as follows.
If hard metal parts such as pins, and bearings are hit with a
hammer, there is danger that small pieces will fly off; this may
lead to seious injury. Wear protective glasses, hard hat, and
other protective equipment.
If pins are hit with a hammer, there is a hazard that the metal
particles may fly out and injure people in the surrounding area.
Always make sure that no-one is in the surrounding area before
using the hammer.
There is a hazard that the pin hit with strong force may fly out
and injure people in the surrounding area.
REPAIR WELDING
Welding operations must always be carried out by a qualified welder and in a place equipped with proper equipment.
There is a hazard of gas, fire, or electrocution when carrying out welding, so never allow any unqualified personnel
to carry out welding.
REMOVING BATTERY TERMINAL
When repairing the electrical system or when carrying out electrical welding, remove the negative (-) terminal of the
battery to prevent the flow of current.
PRECAUTIONS WITH HIGH-PRESSURE OIL
The hydraulic system is always under internal pressure. When inspecting or replacing piping or hoses, always
check that the pressure in the hydraulic circuit has been released. If the circuit is still under pressure, it will lead to
serious personal injury, so always do as follows.
For details of the method of releasing the pressure: see the section on "INSPECTION AND ADJUSTMENT". Do
not carry out any inspection or replacement operation before the pressure has been completely removed.
If there is any leakage from the piping or hoses, the surrounding area will be wet, so check for cracks in the piping
and hoses and for swelling in the hoses.
When carry out inspection, wear safety glasses and leather gloves.
There is a hazard that high-pressure oil leaking from small holes
may penetrate your skin or cause blindness if it contacts your
eyes directly. If you are hit by a jet of high-pressure oil and suffer
injury to your skin or eyes, wash the place with clean water, and
consult a doctor immediately for medical attention.
PRECAUTIONS FOR HIGH-PRESSURE FUEL
When the engine is running, high-pressure is generated in the engine fuel piping. When carrying out inspection or
maintenance of the fuel piping system, stop the engine and wait for at least 30 seconds to allow the internal pressure
to go down before starting the operation.
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SAFETY
PRECAUTIONS FOR MAINTENANCE
HANDLING HIGH-PRESSURE HOSES, PIPING
If oil or fuel leaks from high-pressure hoses, it may cause fire or defective operation, which may lead to serious
injury. If any loose bolts are found, stop work and tighten to the specified torque. If any damaged hoses are found,
stop operations immediately and contact your Komatsu distributor.
Replace the hose if any of the following problems are found.
Damaged or leaking hydraulic fitting.
Frayed or cut covering or exposed reinforcement wire layer.
Covering swollen in places.
Twisted or crushed movable portion.
Foreign material embedded in covering.
PRECAUTIONS FOR HIGH VOLTAGE
When the engine is running or immediately after it has stopped,
high voltage is generated at the injector terminal and inside the
engine controller, so there is danger of electrocution. Never touch
the injector terminal or the inside of the engine controller.
If it is necessary to touch the injector terminal or the inside of the
engine controller, please contact your Komatsu distributor.
WASTE MATERIALS
To prevent pollution, pay careful attention to the method of disposing of waste materials.
Always put oil drained from your machine in containers. Never
drain oil directly onto the ground or dump into the sewage
system, rivers, the sea, or lakes.
Obey appropriate laws and regulations when disposing of
harmful objects such as oil, fuel, coolant, solvent, filters, and
batteries.
MAINTENANCE OF AIR CONDITIONER
If air conditioner refrigerant gets into your eyes, it may cause blindness; if it touches your skin, it may cause frostbite.
Never touch refrigerant.
COMPRESSED AIR
When carrying out cleaning with compressed air, there is a hazard of serious injury caused by flying particles.
When using compressed air to clean elements or the radiator, always wear safety glasses, dust mask, gloves,
and other protective equipment.
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PRECAUTIONS FOR MAINTENANCE
SAFETY
PERIODIC REPLACEMENT OF SAFETY-CRITICAL PARTS
In order for the machine to be operated safely for a long time, it is necessary to add oil and to carry out service
and maintenance at periodic intervals. In order to further increase safety, components with a strong relationship
to safety, such as hoses and seat belts, must be replaced at periodic intervals.
Replacement of safety-critical parts: See "PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS (PAGE
4-15)".
The material of these components naturally changes over time, and repeated use causes deterioration, wear, and
fatigue. As a result, there is a hazard that these components may fail and cause serious injury or death. It is
difficult to judge the remaining life of these components from external inspection or the feeling when operating,
so always replace them at the specified interval.
Replace or repair safety-critical parts if any defect is found, even when they have not reached the specified
replacement time.
2 - 36
.
SAFETY
PRECAUTIONS WITH TIRES
PRECAUTIONS WITH TIRES
HANDLING TIRES
If tires or rims are handled mistakenly, there is danger that the tire
may explode or be damaged, or that the rim may fly off and cause
serious personal injury or death.
To maintain safety, always do as follows.
Maintenance, disassembly, repair, and assembly of the tires
and rims requires special equipment and special technology, so
always ask your Komatsu distributor to carry out these
operations.
Use only the specified tires and inflate them to the specified
pressure.
Suitable inflation pressure: see "SELECTION AND
INSPECTION OF TIRES (PAGE 4-35)".
When pumping up the tires, check that no other person is
standing near the tire, and install an air chuck with a clip that can
be secured to the air valve.
To prevent the tire inflation pressure from becoming too high,
measure the pressure from time to time with an air gauge while
pumping up the tire.
If the tire pressure goes down abnormally or the rim parts do not
fit the tire, there is a problem with the tire or rim parts. Always
contact your Komatsu distributor for repairs.
If the rim parts are not fitted properly when the tire is being
pumped up, there is danger that the rim parts may fly off, so set
up a protective fence around the tire, and do not stand directly
in front of the rim. Stand beside the tread when pumping up the
tire.
Do not adjust the tire inflation pressure immediately after traveling at high speed or carrying out operations under
heavy load.
Never carry out welding or light a fire near the tire.
PRECAUTIONS WHEN STORING TIRE
Tires for construction equipment are extremely heavy, so trying to
hold the tire may lead to serious injury.
As a basic rule, store the tires in a warehouse which
unauthorized persons cannot enter.
If the tires must be stored outside, always erect a fence and put
up "No Entry" signs.
Stand the tire on level ground, and block it securely so that it
cannot roll or fall over if any person should touch it.
Do not lay the tire on its side. This will deform the tire and cause
it to deteriorate.
If the tire should fall over, do not attempt to stop it. Get out of the
way quickly.
2 - 37
.
.
3-1
.
OPERATION
GENERAL VIEW
GENERAL VIEW
GENERAL VIEW OF MACHINE
(1)
(2)
(3)
(4)
(5)
3-2
Hydraulic tank
Dump body
Rear wheel
Hoist cylinder
Front wheel
(6)
(7)
(8)
(9)
(10)
Turn signal lamp
Head lamp
Air cleaner
Fuel tank
Fire extinguisher (if equipped)
.
OPERATION
GENERAL VIEW
GENERAL VIEW OF CONTROLS AND GAUGES
(1)
(2)
(3)
(4)
(5)
(6)
Dump lever
Lamp switch, Turn signal lever, Dimmer switch
Steering wheel
Machine monitor
Retarder control lever
Cigarette lighter
(7)
(8)
(9)
(10)
(11)
Shift lever
Parking brake switch
Accelerator pedal
Brake pedal
Dump lever lock knob
3-3
.
OPERATION
GENERAL VIEW
Enlargement of machine monitor
(1)
(2)
(3)
(4)
(5)
(6)
(7)
3-4
Machine monitor mode selector switch 2
Machine monitor mode selector switch 1
Fog lamp switch (if equipped)
Yellow rotating lamp switch (if equipped)
Side lamp switch (if equipped)
Switch for rear window glass with heated wire
Working lamp (front) switch
(8)
(9)
(10)
(11)
(12)
(13)
Night lighting dimmer switch
Hazard lamp switch
Emergency steering switch
Power mode selector switch
AISS LOW switch
Inter-axle differential lock switch
.
OPERATION
EXPLANATION OF COMPONENTS
EXPLANATION OF COMPONENTS
The following is an explanation of devices needed for operating the machine.
To perform suitable operations correctly and safely, it is important to completely understand methods of operating
the equipment, and the meanings of the displays.
MACHINE MONITOR
A:
B:
C:
Character display
Caution items
Emergency stop item
D:
E:
Meter display portion
Central warning lamp
NOTICE
When the engine starting switch is turned to the ON position before starting the engine, a system check is carried out for 3
seconds.
The central warning lamp lights up for 2 seconds, and then goes out.
The alarm buzzer sounds for 2 seconds, and then stops.
The monitor lamp lights up for 2 seconds and then goes out for 1 second.
The shift indicator displays 88 for 2 seconds and then goes out for 1 second.
After a 3-second system check, the meter starts to function.
The character display shows "KOMATSU" for 3 seconds.
If the lamps do not work, there is probably a failure or disconnection, so please contact your Komatsu distributor for
inspection.
When the starting switch is turned ON, if the shift lever is not at the neutral position, after completion of the system check, the
shift lever position pilot lamp and the central warning lamp will light up, and the alarm buzzer will continue to sound
intermittently. When this happens, if the shift lever is set at neutral, N is displayed, the central warning lamp goes out, and the
buzzer stops.
3-5
.
EXPLANATION OF COMPONENTS
OPERATION
Check central warning lamp, alarm buzzer, monitor lamps, and meters.
Before starting the engine, set the starting switch in the ON position and check that the machine monitor operates
as follows.
The central warning lamp lights up for 2 seconds, then goes off.
The alarm buzzer sounds for 2 seconds, then stops.
The monitor lamps light up for 2 seconds, then go off for 1 second.
The gearshift indicator displays "88" for 2 seconds, then goes off for 1 second.
The meters start the operations after the system is checked for 3 seconds.
The character display displays "KOMATSU" for 3 seconds.
If the machine monitor does not operate as explained above, there is probably a failure, so please contact your
Komatsu distributor for inspection.
3-6
.
OPERATION
EXPLANATION OF COMPONENTS
CHARACTER DISPLAY
The character display can display the following items.
(1)
(2)
(3)
Service meter
Odometer
Reverse travel odometer
(4)
(5)
Action code display
Filter, oil replacement time display
Normally, the service meter/odometer is displayed on the character display.
If the machine has failed, or if there has been excessive load on the machine, or if it is necessary to carry out
inspection and maintenance, an action code is displayed to recommend suitable action.
When the time for replacing the filter or changing the oil is reached, after completion of the system check with the
starting switch at the ON position, the maintenance monitor caution lamps flash or light up, and at the same time,
the filter or oil to be replaced is displayed.
NOTICE
Information regarding the failure of the machine or maintenance is displayed on the character display when the starting switch
is at the ON position, check the display to confirm that there is no problem before starting to travel.
3-7
.
EXPLANATION OF COMPONENTS
SERVICE METER
This meter (1) shows the total time that the machine has been
operating.
While the engine is running, the service meter advances even if the
machine is not moving.
The meter advances by 1 for every hour of operation, regardless of
the engine speed.
Even if the starting switch is at the OFF position, the service meter
will display as long as the top part ( ) of machine monitor mode
selector switch 1 is being pressed.
NOTICE
When the starting switch is at the OFF position, if the service meter is
displayed even though the top ( ) of machine monitor mode selector
switch 1 is not being pressed, there is probably a failure in the machine, so
please contact your Komatsu distributor for inspection.
ODOMETER
This meter (2) indicates the total distance traveled in kilometers.
Even when the starting switch is at the OFF position, while the top
( ) of machine monitor mode selector switch 1 is being pressed,
it indicates the total distance traveled.
NOTICE
When the starting switch is at the OFF position, if the total distance is
displayed even although the top ( ) of machine monitor mode selector
switch 1 is not being pressed, there is probably a failure in the machine, so
please contact your Komatsu distributor for inspection.
REVERSE TRAVEL ODOMETER
This meter (3) indicates the total distance traveled in reverse in
kilometers.
For details of the method of displaying the total distance traveled
in reverse, see "OTHER FUNCTIONS OF MACHINE MONITOR
(PAGE 3-26)".
3-8
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
ACTION CODE DISPLAY
CAUTION
If action code E03 is displayed, stop the machine immediately. Then see "ACTION CODE (PAGE 3-140)" and contact your Komatsu
distributor for repairs.
If the machine has failed, or if there has been excessive load on the machine, or if it is necessary to carry out
inspection and maintenance, an action code is displayed on this panel (4) to recommend suitable action.
If more than one failure occurs at the same time, the most important action code is displayed. The order of
importance, starting from the highest, is E03, E02, and E01. If failures of equal importance occur at the same time,
the latest one is displayed.
When action codes E02 or E03 occur, the alarm buzzer sounds intermittently and the central warning lamp lights
up.
E03: When this code is displayed, stop the machine immediately,
check the failure code, and contact your Komatsu distributor
for repairs.
REMARK
The top line of the character display displays "E03" and the
bottom line displays "CHECK RIGHT NOW" and "CALL" in turn
for 3 seconds each.
The telephone number is displayed on the right of the "CALL"
display. If the telephone number has not been set, there is a
blank. For details of the method of setting the telephone
number, see "INPUT METHOD FOR TELEPHONE NUMBER
(PAGE 3-28)".
E02: If overrun related information is displayed, reduce the engine
speed and the speed of the machine while continuing
operations.
If the overheat related display is given, stop the machine and
run the engine under no load at a mid-range speed.
If an action code is still displayed after doing this, check the
failure code and contact your Komatsu distributor for repairs.
REMARK
The top line of the character display displays "E02" and the bottom
line displays the condition of the machine related to overrun or
overheat.
3-9
.
EXPLANATION OF COMPONENTS
OPERATION
E01: If maintenance location is displayed and the maintenance
caution lamp lights up, carry out inspection and maintenance
of the displayed item after the completion of operations or
when the shift changes.
If "MAINTENANCE" is displayed together with E01, check
the failure code and contact your Komatsu distributor for
repairs.
REMARK
"E01" is displayed on the top line of the character display and
"MAINTENANCE" or the part of the machine requiring inspection,
filling of fluid, or replacement is displayed on the bottom line.
FILTER, OIL REPLACEMENT TIME DISPLAY
After completion of the system check, this display (5) shows for 30
seconds the filters and oil which are near the replacement interval.
The maintenance caution lamp also flashes or lights up at the
same time.
After replacing the filter or changing the oil, reset the replacement
interval. For details, see "RESET METHOD FOR FILTER, OIL
REPLACEMENT TIME (PAGE 3-27)".
REMARK
The top line of the character display shows the name and ID number of the item needing replacement. The line
at the bottom shows the remaining time until replacement and the total number of times the item has been
replaced.
After giving the display for 30 seconds, the display does not appear again until the starting switch is turned again
to the ON position.
If the action code is being displayed, the message in the diagram above is not displayed on the character display.
If there two or more items to be displayed, they are displayed every three seconds.
If there are more than 10 items to be displayed, all the items are displayed once each.
The display is given when the time reaches 30 hours before the filter and oil replacement interval.
When the replacement interval approaches, the maintenance caution lamp flashes, and if the replacement
interval has passed, the lamp lights up.
3 - 10
.
OPERATION
EXPLANATION OF COMPONENTS
Items for display of filter, oil replacement time
Replacement
interval
Character display
ID number
Fuel prefilter
500
FUEL P FILT
41
Engine oil filter
500
ENG FILT
02
Engine oil
500
ENG OIL
01
Fuel main filter
1000
FUEL FILT
03
Corrosion resistor
1000
CORR RES
06
Transmission oil
1000
TM OIL
12
Transmission oil filter
1000
TM FILT
13
Brake oil filter
1000
BK OIL FILT
14
Brake cooling oil filter
1000
BK C FILT
16
Hydraulic filter
2000
HYD FILT
04
Differential case oil
2000
DIFF OIL
11
Final drive oil
2000
FNL OIL
08
Hydraulic oil
4000
HYD OIL
10
Item
REMARK
See the section below for details of the procedure for replacing the filter and oil.
Fuel prefilter
"REPLACE FUEL PREFILTER CARTRIDGE (PAGE 4-54)"
Engine oil filter
"CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE (PAGE 4-53)"
Engine oil
"CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE (PAGE 4-53)"
Fuel main filter
"REPLACE FUEL MAIN FILTER CARTRIDGE (PAGE 4-60)"
Corrosion resistor
"REPLACE CORROSION RESISTOR CARTRIDGE (PAGE 4-61)"
Transmission oil
"CHANGE OIL IN TRANSMISSION CASE (PAGE 4-63)"
Transmission oil filter
"REPLACE TRANSMISSION OIL FILTER ELEMENT - VALVE SIDE (PAGE 4-62)"
Brake oil filter
"CHANGE OIL IN BRAKE OIL TANK, REPLACE BRAKE OIL FILTER ELEMENT (PAGE 4-65)"
Brake cooling oil filter
"REPLACE TRANSMISSION OIL FILTER ELEMENT - BRAKE COOLING SIDE (PAGE 4-62)"
Hydraulic filter
"REPLACE HYDRAULIC FILTER ELEMENT (PAGE 4-73)"
Differential case oil
"CHANGE OIL IN DIFFERENTIAL CASE (PAGE 4-72)"
Final drive oil
"CHANGE OIL IN FINAL DRIVE CASE (PAGE 4-71)"
Hydraulic oil
"CHANGE OIL IN HYDRAULIC TANK (PAGE 4-77)"
3 - 11
.
OPERATION
EXPLANATION OF COMPONENTS
CAUTION ITEMS
CAUTION
If the monitor lights up during travel, inspect the location of the problem quickly and take the necessary action.
(1)
(2)
(3)
Seat belt caution lamp
Parking brake pilot lamp
Dump body pilot lamp
(4)
(5)
(6)
Emergency steering pilot lamp
Fuel level caution lamp
Maintenance caution lamp
SEAT BELT CAUTION LAMP
This monitor (1) lights up if the seat belt is not fastened.
There is danger when traveling, so always fasten your seat belt.
3 - 12
.
OPERATION
EXPLANATION OF COMPONENTS
PARKING BRAKE PILOT LAMP
This monitor (2) lights up when the parking brake is applied.
DUMP BODY PILOT LAMP
This monitor (3) lights up when the dump body is raised or the
dump body lever is at any position other than "FLOAT".
After the starting switch has been turned to the ON position, the
dump body is held in position regardless of the position of the dump
lever, so when canceling, turn the lamp off (see "CANCELING
DUMP BODY HOLD CONDITION (PAGE 3-88)" for details).
EMERGENCY STEERING PILOT LAMP
This monitor (4) lights up when the emergency steering is
actuated.
If any abnormality should occur in the steering oil pressure circuit
when the machine is traveling, the auto emergency steering is
actuated and the related lamp lights up.
FUEL LEVEL CAUTION LAMP
This monitor (5) lights up when the level of the fuel remaining in the
fuel tank goes below 57 liters (15.06 US gal).
If it lights up, check the fuel level and add fuel.
3 - 13
.
EXPLANATION OF COMPONENTS
OPERATION
MAINTENANCE CAUTION LAMP
This monitor (6) lights up if any of the the following are applicable.
When it lights up, action code "E01" and the location needing
maintenance are displayed on the character display at the same
time, so carry out inspection, filling, or replacement.
Drop in engine oil level
Clogged engine oil filter (if equipped)
Drop in hydraulic oil level (if equipped)
Clogged air cleaner
Clogged hydraulic filter (if equipped)
Clogged transmission oil filter
Drop in engine cooling water level
Clogged brake cooling oil filter (if equipped)
REMARK
In addition to the above, if the filter or oil replacement time is displayed on the character display, the lamp will flash
or light up.
3 - 14
.
OPERATION
EXPLANATION OF COMPONENTS
EMERGENCY STOP ITEM
CAUTION
If the monitor lights up, stop operations immediately, then check the corresponding area and carry out the action.
If any problem is found in the emergency stop items, the alarm buzzer will sound intermittently, and the monitor for
the location of the problem and the central warning lamp will light up.
(1)
(2)
(3)
(4)
(5)
(6)
Engine water temperature caution lamp
Torque converter oil temperature caution lamp
Retarder oil temperature caution lamp
Battery charge circuit caution lamp
Steering oil temperature caution lamp
Engine oil pressure caution lamp
(7)
(8)
(9)
(10)
(11)
(12)
Brake oil pressure caution lamp
Tilt caution lamp
Machine monitor, option system caution lamp
Engine system caution lamp
Transmission system caution lamp
Retarder system caution lamp
ENGINE WATER TEMPERATURE CAUTION LAMP
This monitor (1) warns the operator that the engine coolant
temperature has risen.
When it lights up, "E02 ENGINE OVERHEAT" is displayed on the
character display at the same time, and the engine output is
automatically limited.
Run the engine under no load at a mid-range speed until the lamp
goes out.
3 - 15
.
EXPLANATION OF COMPONENTS
TORQUE CONVERTER OIL TEMPERATURE CAUTION LAMP
This monitor (2) warns the operator that the torque converter oil
temperature has risen.
When it lights up, "E02 TC OVERHEAT" is displayed on the
character display at the same time, so stop the machine in a safe
place, set the shift lever to the N position, and run the engine under
no load at a mid-range speed until the lamp goes out.
RETARDER OIL TEMPERATURE CAUTION LAMP
This monitor (3) warns the operator that the brake oil temperature
has risen.
When it lights up, "E02 BRAKE OVERHEAT" is displayed on the
character display at the same time , so stop the machine in a safe
place, set the shift lever to the N position, and run the engine under
no load at a mid-range speed until the lamp goes out.
BATTERY CHARGE CIRCUIT CAUTION LAMP
This monitor (4) lights up when the engine is running to warn the
operator of a problem in the charging system.
When it lights up, "E03 CHECK RIGHT NOW" is displayed on the
character display at the same time, so stop the machine
immediately at a safe place, then stop the engine and check the
charging circuit.
STEERING OIL TEMPERATURE CAUTION LAMP
This monitor (5) lights up to warn the operator that the steering oil
temperature has risen.
When it lights up, "E02 STRG OVERHEAT" is displayed on the
character display at the same time, so stop the machine in a safe
place, set the shift lever to the N position, and run the engine under
no load at a mid-range speed until the lamp goes out.
3 - 16
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
ENGINE OIL PRESSURE CAUTION LAMP
This monitor (6) lights up to warn the operator that the engine
lubricating oil pressure has dropped.
When it lights up, "E03 CHECK RIGHT NOW" is displayed on the
character display, and the engine output is automatically limited.
Stop the machine immediately at a safe place, then stop the engine
and carry out inspection.
The lamp lights up if the engine lubricating oil pressure goes below
the specified value when the engine is running,
If the engine is not running, the lamp does not light up.
BRAKE OIL PRESSURE CAUTION LAMP
This monitor (7) lights up to warn the operator that the brake oil
pressure has dropped.
The central warning lamp and alarm buzzer are not actuated when
the engine is stopped.
If the brake oil pressure is lower than the specified value 30
seconds after the engine has been started, "E03 CHECK RIGHT
NOW" is displayed on the character display, so stop the machine
immediately at a safe place, then stop the engine and carry out
inspection.
TILT CAUTION LAMP
This monitor (8) lights up if the rear of the machine is tilted beyond
the safety range to the left or right when the dump lever is at the
RAISE position.
Lower the body and move the machine to a safe place where the
machine is stable.
MACHINE MONITOR, OPTION SYSTEM CAUTION LAMP
This monitor (9) lights up when a problem has been detected in the
machine monitor or in the system for an installed option.
When it lights up, "E03 CHECK RIGHT NOW" is displayed on the
character display at the same time, so stop the machine
immediately at a safe place, then stop the engine and carry out
inspection.
3 - 17
.
EXPLANATION OF COMPONENTS
ENGINE SYSTEM CAUTION LAMP
This monitor (10) lights up when a problem has been detected in
the system controlled by the engine controller.
When it lights up, "E03 CHECK RIGHT NOW" is displayed on the
character display at the same time, so stop the machine
immediately at a safe place, then stop the engine and carry out
inspection.
TRANSMISSION SYSTEM CAUTION LAMP
This monitor (11) lights up when a problem has been detected in
the system controlled by the transmission controller.
When it lights up, "E03 CHECK RIGHT NOW" is displayed on the
character display at the same time, so stop the machine
immediately at a safe place, then stop the engine and carry out
inspection.
RETARDER SYSTEM CAUTION LAMP
This monitor (12) lights up when a problem has been detected in
the system controlled by the retarder controller.
When it lights up, "E03 CHECK RIGHT NOW" is displayed on the
character display at the same time, so stop the machine
immediately at a safe place, then stop the engine and carry out
inspection.
3 - 18
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
METER DISPLAY PORTION
PILOT DISPLAY PORTION
When the starting switch is ON, the pilot display lights up when the display items are functioning.
(1)
(2)
(3)
(4)
(5)
Engine pre-heating pilot lamp
Retarder pilot lamp
Inter-axle differential lock pilot lamp
Lock-up pilot lamp
Shift hold pilot lamp
(6)
(7)
(8)
(9)
(10)
Head lamp high beam pilot lamp
Turn signal pilot lamp
Shift indicator
Shift lever position pilot lamp
Power mode pilot lamp
ENGINE PRE-HEATING PILOT LAMP
This monitor (1) lights up when the electrical heater for pre-heating
the engine is being actuated. When the starting switch is turned to
the ON position in cold weather, the monitor lights up. It goes out
after 20 to 30 seconds to indicate that the pre-heating has been
completed.
3 - 19
.
EXPLANATION OF COMPONENTS
RETARDER PILOT LAMP
This monitor (2) lights up when the retarder control lever is pulled
and the retarder is actuated.
INTER-AXLE DIFFERENTIAL LOCK PILOT LAMP
This monitor (3) lights up when the inter-axle differential lock is
actuated.
LOCKUP PILOT LAMP
This pilot lamp (4) lights up when the torque converter lockup is
engaged and the transmission is shifted to direct drive.
SHIFT HOLD PILOT LAMP
This monitor (5) lights up when the shift hold switch is actuated.
3 - 20
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
HEAD LAMP HIGH BEAM PILOT LAMP
This monitor (6) lights up when the head lamps are set to high
beam.
TURN SIGNAL PILOT LAMP
This pilot lamp (7) flashes at the same time as the turn signal lamp
flashes.
SHIFT INDICATOR
This monitor (8) shows the transmission shift range (speed range).
SHIFT LEVER POSITION PILOT LAMP
This monitor (9) displays the position of the shift lever.
The letter or number for the speed range selected by the shift lever
lights up.
3 - 21
.
EXPLANATION OF COMPONENTS
POWER MODE PILOT LAMP
This monitor (10) displays the power mode.
When the mode is selected with the power mode selector switch,
either High Power (P) or Economy (E) lights up.
3 - 22
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
METERS
(1)
(2)
(3)
Speedometer
Engine tachometer
Fuel gauge
(4)
(5)
(6)
Engine water temperature gauge
Torque converter oil temperature gauge
Retarder oil temperature gauge
SPEEDOMETER
This meter (1) indicates the travel speed of the machine.
ENGINE TACHOMETER
This meter (2) shows the engine speed.
If the gauge indicator the red range during operations, the alarm
buzzer will sound and the central warning lamp will light up at the
same time, so reduce the engine speed and the machine travel
speed.
3 - 23
.
EXPLANATION OF COMPONENTS
FUEL GAUGE
This meter (3) shows the amount of fuel remaining in the fuel tank.
When the fuel level caution lamp lights up, it indicates that there is
less than 57 liters (15.06 US gal) of fuel remaining in the tank, so
check and add fuel.
ENGINE WATER TEMPERATURE GAUGE
This meter (4) indicates the engine water temperature.
It should be in the white range during operation.
If it is in the red range during operation, the alarm buzzer will sound
and the central warning lamp will light up at the same time. "E02
ENGINE OVERHEAT" is displayed on the character display, so
run at the engine under no load at a mid-range speed and wait until
the meter enters the white range.
If it is in the red range, the engine output is automatically limited.
TORQUE CONVERTER OIL TEMPERATURE GAUGE
This meter (5) indicates the torque converter oil temperature.
It should be in the white range during operation.
If it is in the red range during operation, the alarm buzzer will sound
and the central warning lamp will light up. "E02 TC OVERHEAT"
is displayed on the character display, so run the engine under no
load at a mid-range speed and wait until the meter enters the white
range.
RETARDER OIL TEMPERATURE GAUGE
This meter (6) indicates the retarder oil temperature.
It should be in the white range during operation.
If it is in the red range during operation, the alarm buzzer will sound
and the central warning lamp will light up at the same time. "E02
BRAKE OVERHEAT" is displayed on the character display, so
stop the machine in a safe place, set the shift lever to the N
position, run the engine under no load at a mid-range speed and
wait until the lamp goes out.
3 - 24
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
CENTRAL WARNING LAMP
If the machine is in the following condition, this lamp will flash, and
at the same time, the alarm buzzer will sound intermittently.
When a problem has occurred in any of "EMERGENCY STOP
ITEM (PAGE 3-15)".
When action code "E02" or "E03" is displayed on the character
display.
If the parking brake is applied, but the shift lever is not at the N
position.
When the dump lever is not at the FLOAT position or the dump
body is raised and the shift lever is not at the N position.
When the engine tachometer indicates the red range.
3 - 25
.
EXPLANATION OF COMPONENTS
OPERATION
OTHER FUNCTIONS OF MACHINE MONITOR
DISPLAY METHOD FOR REVERSE TRAVEL ODOMETER
Use this when checking the total travel distance in reverse.
1. Check that the character display is showing the service meter/odometer, or the action code. If it is giving any
other display, turn the starting switch OFF, then turn the starting switch to the ON position and wait for the above
display to be given.
2. Press the ( ) of machine monitor mode selector switch 1. It
displays the overall distance traveled in reverse.
3. When completing the operation, press („) of machine monitor
mode selector switch 1 or turn the starting switch OFF.
3 - 26
.
OPERATION
EXPLANATION OF COMPONENTS
RESET METHOD FOR FILTER, OIL REPLACEMENT TIME
The filter and oil replacement time is displayed on the character display, so if the filter and oil have been replaced,
reset the filter and oil change time.
1. Press the ( ) of machine monitor mode selector switch 1, and display the reverse travel in odometer.
2. Press (>) or (<) of machine monitor mode selector switch 2 and
display "MAINTENANCE MONITOR".
3. Press the ( ) of machine monitor mode selector switch 1. It
will change to the display in the diagram on the right.
The bottom line shows two items: the replacement time on the
left and the total number of times the item has been replaced
on the right.
4. Press (>) or (<) of machine monitor mode selector switch 2 and
display the item to be reset.
5. Press the ( ) of machine monitor mode selector switch 1. It
will change to the display in the diagram on the right.
The top line shows [Reset] and [Item to be reset] in turn.
6. When resetting the replacement time, press (>) or (<) of
machine monitor mode selector switch 2, align the cursor with
"YES", then press („) of machine monitor mode selector
switch 1. It will reset and returned to the previous screen.
To abandon, align the cursor with "NO", then press („) of
machine monitor mode selector switch 1.
7. When resetting the replacement time for another item, carry out the procedure from Step 4. After completing,
press („) of machine monitor mode selector switch 1 twice or turn the starting switch OFF.
3 - 27
.
EXPLANATION OF COMPONENTS
OPERATION
INPUT METHOD FOR TELEPHONE NUMBER
When an error for action code "E03" occurs, it is possible to display the telephone number.
1. Press the ( ) of machine monitor mode selector switch 1 and display the reverse travel odometer.
2. Press (>) or (<) of machine monitor mode selector switch 2 and
display "TEL".
3. Press ( ) of machine monitor mode selector switch 1. It will
change to the display in the diagram on the right.
Once the telephone number is input, the input number will be
displayed next time.
4. Up to 12 digits can be displayed for the telephone number.
Input from the first digits.
The cursor is displayed at the input position. Press (>) or (<) of
machine monitor mode selector switch 2 and display "0 - 9 ".
To leave a blank, select "*".
When the input value is decided, press ( ) of machine monitor
mode selector switch 1. The cursor will move to the next
position.
5. Repeat the procedure in Step 4 until the last digit. At the last digit, press ( ) of machine monitor mode selector
switch 1 to return to the previous screen.
If there is a mistake in the input or the input is to be stopped, press („) of machine monitor mode selector switch
1 to return to the previous screen.
6. When completing the operation, press („) of machine monitor mode selector switch 1 twice or turn the starting
switch OFF.
3 - 28
.
OPERATION
EXPLANATION OF COMPONENTS
METHOD FOR SELECTING LANGUAGE
Use this when switching the language displayed on the character display.
1. Press the ( ) of machine monitor mode selector switch 1 and display the reverse travel odometer.
2. Press (>) or (<) of machine monitor mode selector switch 2 and
display "LANGUAGE".
3. Press the ( ) of machine monitor mode selector switch 1. The
presently selected language is displayed.
4. Press (>) or (<) of machine monitor mode selector switch 2 and
select the language.
The available languages are English, Japanese, German, French,
Italian, Spanish, and Swedish.
5. When the ( ) of machine monitor mode selector switch 1 is pressed, the language is set and the screen returns
to the previous screen.
6. When completing the operation, press („) of machine monitor mode selector switch 1 twice or turn the starting
switch OFF.
3 - 29
.
OPERATION
EXPLANATION OF COMPONENTS
SWITCHES
(1) Starting switch
(2) Lamp switch
Turn signal lever
Dimmer switch
(3) Hazard lamp switch
(4) Night lighting dimmer switch
(5) Power mode selector switch
(6) Emergency steering switch
(7) Shift hold switch
(8) Parking brake switch
(9) AISS LOW switch
(10) Inter-axle differential lock switch
3 - 30
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
Fog lamp switch (if equipped)
Side lamp switch (if equipped)
Working lamp (front) switch
Switch for rear window glass with heated wire
Yellow rotating lamp switch (if equipped)
Power window switch (right) (if equipped)
Power window switch (left)
Machine monitor mode selector switch 1, 2
Cigarette lighter
Horn button
Wiper, window washer switch
Room lamp switch
.
OPERATION
EXPLANATION OF COMPONENTS
STARTING SWITCH
This switch (1) is used to start or stop the engine.
OFF position :
At this position, the starting switch key can be inserted or removed.
When the key is turned to this position, all the electric circuits are
switched off and the engine stops.
ON position :
In this position, electric current flows in the charging and lamp
circuits.
Keep the starting switch key at the ON position while the engine is
running.
When turning the starting switch ON or OFF, if the starting switch
is held at a position between ON and OFF, the controller may
detect this as a problem. If this happens, return the starting switch
to the OFF position, then operate it as usual to the ON position.
In cold weather, if the starting switch is turned to the ON position, pre-heating is automatically started and the engine
pre-heating pilot lamp lights up. After the pre-heating is completed, the engine pre-heating pilot lamp goes out.
START position :
This is the position to start the engine. Hold the key at this position while cranking. Release the key immediately after
the engine has been started. The key will return to the ON position when released.
LAMP SWITCH
This switch (2) lights up the head lamps, side clearance lamps, tail
lamps, machine monitor lighting, and rear lamps.
Position (a): OFF
Position (b): Side clearance lamps, tail lamps, real lamps, and
machine monitor lighting light up
Position (c): Front lamps light up in addition to lamps at position (b)
The lamp switch can be operated regardless of the position of the
lever.
TURN SIGNAL LEVER
This lever (2) operates the turn signal lamp.
(a)Right turn: Push the lever forward
(b)Left turn: Push the lever back
When the lever is operated, the turn signal pilot lamp also flashes.
The lever is automatically returned when the steering wheel is
turned back. If the lever does not return, move it by hand.
3 - 31
.
EXPLANATION OF COMPONENTS
DIMMER SWITCH
This switch (2) is used to switch the head lamps between high
beam and low beam.
Each time switch (2) is moved up in direction (a), the head lamps
switch between high beam and low beam. When the switch is
released, it automatically returns to its original position (b).
When the lamp switch is OFF, if the switch is operated in direction
(a), the head lamps light up at the high beam position.
HAZARD LAMP SWITCH
This switch (3) is used to make the left and right turn signal
indicators flash.
(a): OFF
(b): Turn signal lamp and turn signal pilot lamp flash
When working at night, the symbol inside the switch lights up
regardless of the selected position of the switch.
NIGHT LIGHTING DIMMER SWITCH
This switch (4) is used to adjust the brightness of the lighting inside
the machine monitor and the pilot lamp display. Turn it to the right
to make the display brighter; turn it to the left to make the display
dimmer.
3 - 32
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
POWER MODE SELECTOR SWITCH
This switch (5) is used to switch the power mode. This makes it
possible to travel economically in a way suited to the operating
conditions.
If portion (a) of the switch is pressed, high-power mode pilot lamp
(P) lights up and the system is switched to the high-power mode.
If portion (b) of the switch is pressed, economy mode pilot lamp (E)
lights up and the system is switched to the economy mode.
(a): High power mode (general operations)
Normal standard operating conditions
(b): Economy mode (operations on flat ground)
Work with emphasis on fuel consumption, such as work on flat
ground where the maximum power is not needed
When working at night, the symbol inside the switch lights up regardless of the selected position of the switch.
EMERGENCY STEERING SWITCH
This switch (6) is used to actuate the emergency steering pump.
When the switch is pressed, the emergency pump is actuated to
make it possible to operate the steering.
When the switch is ON, the pilot lamp (red) inside the switch and
the pilot lamp on the machine monitor light up.
The emergency steering pump can be used for a maximum of 90
seconds.
When the emergency steering is being used, keep the travel speed
to a maximum of 5 km/h (3.1 MPH).
The emergency steering is actuated automatically in the following cases.
When the steering hydraulic pump fails
When the engine has stopped during operation
When the emergency steering is actuated, stop the machine promptly and perform inspection.
If the starting switch is at the ON position and the parking brake switch is at the TRAVEL position when the machine
is stopped, the automatic emergency steering is actuated after 1 second, so set the parking brake switch to the
PARKING position.
3 - 33
.
EXPLANATION OF COMPONENTS
OPERATION
SHIFT HOLD SWITCH
This switch (7) actuates the gearshift limiter.
Activating the shift hold function will restrict the automatic shifting
of the transmission to gear speeds below the gearshift lever gear
shifting.
The shift hold function can be canceled by [1] moving the gearshift
lever or [2] activating the shift hold switch located on the gearshift
lever.
The shift hold pilot lamp located on the machine instrument panel
will indicated the status of the shift hold function.
Before starting either up or down a range, pre-select the
transmission gear and maintain a machine travel speed which will
give you full control under all the anticipated conditions.
When the machine is running, the transmission may cause hunting (a repetition of shifting up and shifting down in
a short span of time), depending on the road condition, load condition and slope grade. In that case, press the shift
hold switch and run, holding a low gear speed, in order to protect the transmission as well as to ensure operator's
comfortability.
3 - 34
.
OPERATION
EXPLANATION OF COMPONENTS
PARKING BRAKE SWITCH
WARNING
When parking or leaving the machine, always apply the parking brake.
This switch (8) is used to actuate and release the parking brake
valve.
(a): Parking
The parking brake is applied.
(b): Travel
The parking brake is released.
When the switch is set to the PARKING position, the parking brake
pilot lamp lights up.
When the switch is set to the PARKING position, if the shift lever
is at any position other than N, the central warning lamp will flash
and the alarm buzzer will sound.
If the pressure saved in the accumulator drops and goes below 5.4 MPa {55 kg/cm2, 781 PSI}, the brake and parking
brake are automatically applied. For details of the method of releasing the brake, see "WHEN PARKING BRAKE
HAS BEEN ACTUATED IN EMERGENCY (PAGE 3-130)".
When working at night, the symbol inside the switch lights up regardless of the selected position of the switch.
REMARK
If the engine is stopped with the parking brake switch at TRAVEL, the parking brake will be applied automatically
even though the parking brake switch is at TRAVEL. When starting the engine again, operate the parking brake
switch to PARKING, and then move it back to TRAVEL to cancel the parking brake.
NOTICE
During loading operations, do not apply the parking brake. Apply the retarder brake.
3 - 35
.
EXPLANATION OF COMPONENTS
OPERATION
AISS LOW SWITCH
Using this switch (9), it is possible to switch the AISS freely
between AUTO and LOW. Use each position as follows.
(a): AUTO position
For normal operations
(b): LOW position
When fine control of the machine is needed, such as when
putting it into a garage.
If the switch is at AUTO position:
When stopping the machine, if the parking brake or retarder brake are operated, the idling is automatically
adjusted to low speed; when starting the machine, if the parking brake is canceled, the idling is automatically
adjusted to high-speed.
The water temperature is detected, and when it is at low temperature, the idle is automatically adjusted to high
speed to reduce the warming-up time.
When working at night, the symbol inside the switch lights up regardless of the selected position of the switch.
INTER-AXLE DIFFERENTIAL LOCK SWITCH
This switch (10) can be used to switch the actuating conditions for
the inter-axle differential lock.
When this switch is pressed, the system is switched to MANUAL.
When the switch is not pressed or is pressed to return it, the
system is switched to AUTO.
AUTO: The slippage of the front axle is detected and the inter-axle
differential lock is automatically actuated.
MANUAL: When the shift lever is at the F3, F2, F1, N, R1, or R2
position, the inter-axle differential lock is actuated.
Regardless of the position of the switch, when the differential lock is actuated, the inter-axle differential lock pilot
lamp lights up.
When working at night, the symbol inside the switch lights up regardless of the selected position of the switch.
For details when using the differential lock, see "OPERATION USING DIFFERENTIAL LOCK (PAGE 3-103)".
FOG LAMP SWITCH
(If equipped)
This switch (11) is used to switch on the fog lamp.
(a): Fog lamp goes out
(b): Fog lamp lights up
When working at night, the symbol inside the switch lights up
regardless of the selected position of the switch.
3 - 36
.
OPERATION
EXPLANATION OF COMPONENTS
SIDE LAMP SWITCH
(If equipped)
This switch (12) is used to switch on the side lamp.
(a): Side lamp goes out
(b): Side lamp lights up
When working at night, the symbol inside the switch lights up
regardless of the selected position of the switch.
WORKING LAMP (FRONT) SWITCH
This switch (13) is used to switch on the working lamp (front).
(a): Working lamp goes out
(b): Working lamp lights up
When working at night, the symbol inside the switch lights up
regardless of the selected position of the switch.
SWITCH FOR REAR WINDOW GLASS WITH HEATED WIRE
Use this switch (14) to turn the heater for the rear glass ON/OFF.
(a): Wire heater OFF
(b): Wire heater ON
When working at night, the symbol inside the switch lights up
regardless of the selected position of the switch.
REMARK
The wire heater does not automatically turn OFF when it becomes
hot, so when it is not needed, turn the switch manually to the OFF
position.
YELLOW ROTATING LAMP SWITCH
(If equipped)
This switch (15) is used to switch the yellow rotating lamp on and
off. When the lamp is switched on, it lights up and rotates.
(a): Yellow rotating lamp goes out
(b): Yellow rotating lamp lights up
When working at night, the symbol inside the switch lights up
regardless of the selected position of the switch.
3 - 37
.
OPERATION
EXPLANATION OF COMPONENTS
POWER WINDOW SWITCH (RIGHT) (LEFT)
(The right power window is optional.)
WARNING
When closing the window glass, be careful not to get anyone's hands or head caught.
There is danger of serious injury if anyone is caught in the window glass.
CAUTION
After fully opening or fully closing the window glass, release the switch immediately. If the switch is kept operated, it may cause
failure of the power window.
Switches (16) and (17) are used to open and close the window
glass. The switches can only be used when the starting switch is
at the ON position.
(A): Glass goes down
(B): Glass goes up
When the glass reaches the top or bottom and stops, release the
switch.
MACHINE MONITOR MODE SELECTOR SWITCH 1, 2
This switch (18) is used to operate the character display.
CIGARETTE LIGHTER
This switch (19) is used to light cigarettes.
When the cigarette lighter is pushed in, it will return to its original
position after several seconds, then pull it out and use it to light
your cigarette.
3 - 38
.
OPERATION
EXPLANATION OF COMPONENTS
HORN BUTTON
When the horn button (20) in the center of the steering wheel is
pressed, the horn will sound.
WIPER, WINDOW WASHER SWITCH
This switch (21) is used to operate the wiper for the front glass and rear glass.
Using the wiper when the glass is dry will scratch the glass. Spray with window washer fluid before actuating the
wiper.
Front wiper
Position (a) (OFF): Stopped
Position (b) (INT): Wiper moves once every 4 to 7 seconds
Position (c) (LOW): Wiper moves at low speed
Position (d) (Hi): Wiper moves at high speed
When the button at the tip of the switch is pressed, washer fluid is
sprayed out.
Do not keep the button pressed for more than 10 seconds.
Rear wiper
Position (a): Washer fluid is sprayed out
Position (b) (OFF): Stopped
Position (c): Wiper is actuated
Position (d): Wiper is actuated and washer fluid is sprayed out
ROOM LAMP SWITCH
The switch (22) is used to turn the room lamp ON and OFF.
Position (a): OFF
Position (b): Lights up when the door opens
Position (c): Lights up
REMARK
The room lamp lights up even when the main switch is OFF, so
when leaving the operator's seat, set the switch to position (a)
or (b).
When carrying out operations with the door fully opened, set the
switch to position (a) (OFF).
3 - 39
.
OPERATION
EXPLANATION OF COMPONENTS
CONTROL LEVERS AND PEDALS
(1)
(2)
(3)
Brake pedal
Accelerator pedal
Shift lever
BRAKE PEDAL
This pedal (1) is used to apply the wheel brakes.
3 - 40
(4)
(5)
(6)
Dump lever
Retarder control lever
Dump lever lock knob
.
OPERATION
EXPLANATION OF COMPONENTS
ACCELERATOR PEDAL
This pedal (2) is used to adjust the engine speed.
It can be operated freely between the engine low idle position and
the full throttle position.
GEAR SHIFT LEVER
The gear range can be selected with this lever (3) to match the
travel conditions.
Position D:
This is used when traveling normally. When this position is used,
the transmission is set automatically between the 2nd torque
converter drive and 6th gear according to the travel speed. While
the dump body is raised, however, the transmission is fixed to the
2nd gear and is not changed. Keep the dump body lowered during
travel. The maximum travel speed in this position is 58.6 km/h
(36.4 MPH).
REMARK
In conformity with the EU safety rule (EN474-6 5.1.3), the gear shift
lever is restricted to the 2nd speed and cannot be shifted in the D
position, when the machine is running while the dump body is not
fully lowered to its seat.
Position R1:
This is used when traveling in reverse. When this position is used, the transmission is fixed in R1 and the travel is
carried out in torque converter drive or direct drive according to the travel speed. The maximum travel speed in this
position is 7.6 km/h (4.7 MPH).
Position R2:
This is used when traveling in reverse. When this position is used, the transmission is fixed in R2 and the travel is
carried out in torque converter drive or direct drive according to the travel speed. The maximum travel speed in this
position is 18.1 km/h (11.2 MPH).
The machine cannot travel in reverse while the dump body is raised. Lower the dump body and set the dump lever
in the "FLOAT" position, and then set it in the "R1" or "R2" position.
3 - 41
.
OPERATION
EXPLANATION OF COMPONENTS
5 - 1 position:
These positions are used in places where it is difficult to travel at high speed, or when traveling on soft ground, or
when starting the machine off on a slope when it is loaded. They are also used
when going downhill if it is needed to use the braking force of the engine.
While the dump body is raised, the transmission is fixed to the 1st gear and is not changed. Keep the dump body
lowered during travel.
REMARK
In conformity with the EU safety rule (EN474-6 5.1.3), the gear shift lever is restricted to the 1st speed and cannot
be shifted if it is anywhere between 1 to 5 positions, when the machine is running while the dump body is not fully
lowered to its seat.
The speed ranges for each position are as follows.
Position
Speed range
Max. speed [km/h (MPH)]
R2
R2nd torque converter - direct
18.1 (11.2)
R1
R1st torque converter - direct
7.6 (4.7)
D
2nd torque converter - 6th direct
58.6 (36.4)
5
1st torque converter - 5th direct
38.4 (23.9)
4
1st torque converter - 4th direct
25.5 (15.8)
3
1st torque converter - 3rd direct
16.2 (10.1)
2
1st torque converter - 2nd direct
10.7 (6.6)
1
1st torque converter - 1st direct
6.8 (4.2)
When operating the shift lever, be sure to set it in position securely.
If the lever is not placed in position properly, the shift position display on the panel may go out and the Transmission
system caution lamp may light up.
Before shifting between forward and reverse, stop the machine completely and then run the engine at low idle.
When starting the engine, if the shift lever is not at the N (neutral) position, the engine will not start.
When the starting switch is at the ON position, if the shift lever is not at the N (neutral) position, the shift lever position
pilot lamp will flash, the central warning lamp will light up, and the alarm buzzer will sound.
If the parking brake is applied or the shift lever is not at the N (neutral) position, the central warning lamp will light
up and the alarm buzzer will sound.
If the shift lever is set to any position other than N (neutral) when the dump lever is at a position other than FLOAT
or the body is still raised, the central warning lamp will light up and the alarm buzzer will sound.
The shift lever must not be returned to the N (neutral) position while traveling.
Release the accelerator pedal and run the engine at low idle when moving the shift lever from the N position to the
forward or reverse position.
3 - 42
.
OPERATION
EXPLANATION OF COMPONENTS
When moving the shift lever from the N (neutral) position to the R1
(reverse) position or from the N position to the D position, press the
lock button on the shift lever before operating it.
Activating the shift hold function will restrict the automatic shifting
of the transmission to gear speeds below the gearshift lever gear
shifting.
The shift hold function can be canceled by [1] moving the gearshift
lever or [2] activating the shift hold switch located on the gearshift
lever.
The shift hold pilot lamp located on the machine instrument panel
will indicated the status of the shift hold function.
Before starting either up or down a range, pre-select the
transmission gear and maintain a machine travel speed which will
give you full control under all the anticipated conditions.
DUMP LEVER
CAUTION
To prevent damage to the dump body through vibration from the road
surface, always lower the dump body before traveling.
This lever (4) is used to operate the dump body.
(a) RAISE
(b) HOLD: The dump body stops and is held in position.
(c) FLOAT: The dump body moves freely under external force.
(d) LOWER
Always set to the FLOAT position when traveling.
It is impossible to travel in reverse if the dump body is raised.
If the engine stops during the dump operation, the dump body is held in position, regardless of the position of the
dump lever. Even when the engine starts again, the dump body is held in position. For details of the method of
canceling the hold function, see "CANCELING DUMP BODY HOLD CONDITION (PAGE 3-88)".
3 - 43
.
EXPLANATION OF COMPONENTS
RETARDER CONTROL LEVER
CAUTION
The retarder must not be used as a parking brake.
Use this lever (5) to operate the retarder when traveling downhill.
The more the lever is pulled, the greater the braking force
becomes.
When the retarder is operated, the retarder operation lamp lights
up.
When leaving the operator's seat, always apply the parking brake.
DUMP LEVER LOCK KNOB
WARNING
When carrying out inspection of the machine with the dump body raised,
always set the dump lever to the HOLD position, lock with the dump lever
lock knob, then use the body pivot pin.
This device (6) is used to lock the dump lever.
To set to the FREE position, pull the lock knob up until it stops, then
turn it to lock it in position.
To set to the LOCK position, pull the lock knob up, then turn it to
release the lock. The knob will be pushed in by the force of the
spring, and the lock will be applied. After doing this, check that the
dump lever is locked.
3 - 44
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
BODY PIVOT PIN
WARNING
When carrying out inspection of the machine with the dump body raised, always set the dump lever to the HOLD position, lock
with the dump lever lock knob, then use the body pivot pin.
This is a safety device for the dump body, and is used when
carrying out inspection or maintenance with the dump body raised.
Raise the dump body fully, insert body pivot pins (1). Always insert
the body pivot pins on both sides.
STOWING BODY PIVOT PIN
Store the body pivot pin under the rear of the dump body.
Insert body pivot pin (1), then insert lock pin (2) to stow the body
pivot pin.
ARTICULATE LOCK
WARNING
If the machine is transported or raised without applying the articulation lock, the machine may suddenly articulate. This may
cause serious injury to persons in the surrounding area.
When transporting or raising the machine, always apply the articulation lock.
Apply the articulation lock if necessary when carrying out maintenance.
The articulation lock is a device to lock the front frame and rear
frame to prevent the machine from articulating.
LOCK position: Always set to this position when transporting or
raising the machine.
Set to the LOCK position if necessary when
carrying out maintenance.
FREE position: Always set to this position when traveling
3 - 45
.
EXPLANATION OF COMPONENTS
LOCATION OF FIRE EXTINGUISHER
Fire extinguisher (1) is installed to the left front of the machine.
DUST INDICATOR
This device indicates clogging of the air cleaner.
Depending on the degree of clogging of the element, red line (1)
appears in the transparent portion. If red line (1) indicates 7.5 kPa
(30 INCHES H2O) (0.076 kg/cm2, 1.1 PSI), clean the element
immediately.
After cleaning, press top portion (2) of the indicator to return red
line (1) to its original position.
CIRCUIT BREAKER
After the circuit breaker operates, it can be reset by pushing in the
reset button. If the reset button comes out soon after it is pushed
in, there may be a short circuit in the electric circuit. In this case,
ask your Komatsu distributor for repair.
(1) For primary power supply (30 A)
(2) For primary power supply (Direct) and engine controller (30 A)
(3) For secondary power supply (Accessory power) (80 A)
3 - 46
OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
FUSES
The fuses protect the electrical equipment and wiring from burning
out.
If the fuse becomes corroded, or white powder can be seen, or the
fuse is loose in the fuse holder, replace the fuse.
NOTICE
When replacing any fuse, always turn the power off (turn the starting
switch to OFF).
When replacing the fuse, always use a fuse of the same capacity and
type.
FUSE CAPACITY AND CIRCUIT NAME
Fuse BOX I (BT1)
No. Capacity
Name of circuit
(1)
20A
Main lamp
(2)
10A
Turn signal lamp
(3)
20A
Head lamp (right)
(4)
20A
Head lamp (left)
(5)
10A
Side lamp (right)
(6)
10A
Side lamp (left)
(7)
10A
Stop lamp
(8)
20A
Backup lamp, backup buzzer
(9)
20A
Working lamp (front)
(10)
20A
–
3 - 47
.
OPERATION
EXPLANATION OF COMPONENTS
Fuse box II (BT2)
No. Capacity
Name of circuit
(11)
5A
Engine controller
(12)
10A
KOMTRAX
(13)
10A
Machine monitor
(14)
10A
Parking brake
(15)
10A
Rear view monitor
(16)
20A
Front wiper
(17)
20A
Rear wiper
(18)
10A
Machine monitor, KOMTRAX
(19)
10A
Retarder controller
(20)
20A
Terminal ‚a
(21)
10A
Transmission controller
(22)
20A
Hazard lamp
(23)
10A
Emergency steering
(24)
10A
Room lamp
(25)
20A
Direct from battery (spare)
Fuse box III (BT3)
No. Capacity
Name of circuit
(26)
20A
Fog lamp (if equipped)
(27)
20A
Air conditioner controller (if equipped)
(28)
10A
Heater
(29)
10A
Heater
(30)
10A
Machine monitor
(31)
10A
Retarder controller
(32)
10A
Transmission controller
(33)
10A
Emergency steering, Parking brake relay
(34)
20A
Power window (right)
(35)
20A
Power window (left)
(36)
20A
(37)
20A
(38)
20A
(39)
30A
Rear heater
(40)
30A
Engine controller
3 - 48
.
OPERATION
EXPLANATION OF COMPONENTS
Fuse box IV (BT4)
No. Capacity
Name of circuit
(41)
10A
Spot Light (if equipped), Room lamp 2
(42)
10A
Radio
(43)
10A
Yellow rotating lamp (if equipped)
Step lamp (if equipped)
(44)
20A
Side lamp (if equipped)
(45)
10A
Auto-preheater
(46)
10A
Horn
(47)
10A
Tachograph (if equipped)
(48)
10A
Cigarette lighter
(49)
10A
Air suspension seat
(50)
10A
Air conditioner
Fuse box V
No. Capacity
(51)
120A
Name of circuit
Power supply for electrical intake air heater
Precautions when adding electrical equipment
CAUTION
If the electrical equipment system is changed, problems may occur in the machine control. Do not make any changes to the
electrical system.
If you want to make any change to the electrical system, please contact your Komatsu distributor.
3 - 49
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OPERATION
EXPLANATION OF COMPONENTS
CAR RADIO
(If equipped)
EXPLANATION OF COMPONENTS
(1)
(2)
(3)
(4)
(5)
Power switch/Volume
Tone control knob
Display
Clock button/Displaying frequency
AST
(6)
(7)
(8)
(9)
Preset switch
Seek
Band selector switch
Tuning switch
POWER SWITCH/VOLUME
When this switch (1) is turned to the right, it clicks and the power is
turned on. If it is turned further, the speaker volume is adjusted.
3 - 50
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OPERATION
EXPLANATION OF COMPONENTS
TONE CONTROL KNOB
If this knob (2) is turned to the right, the high tone is emphasized;
if it is turned to the left, the high tone is reduced.
DISPLAY
This display (3) shows the radio reception frequency and the
operating mode.
CLOCK BUTTON/DISPLAYING FREQUENCY
When this button (4) is pressed, the display changes to the time.
If it is pressed again, it displays the frequency.
AST
When this button (5) is pressed, the preset stations are called up
in turn.
When the desired broadcasting station is reached, press the
button again to stop it.
If the button is kept pressed continuously for 2 seconds, it is set to
auto memory.
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EXPLANATION OF COMPONENTS
PRESET SWITCH
With this switch (6), each button can be set to one station each for
FM and MW (AM). (For details of the method of resetting, see
"METHOD OF PRESET (PAGE 3-54)".)
SEEK
When this switch (7) ("SEEK") is pressed, it automatically
searches for stations that can be received, and when it receives a
station, it stops.
BAND SELECTOR SWITCH
When this switch (8) ("BAND") is pressed, the band is switched
between FM and MW (AM).
The reception band and frequency are displayed on the display.
TUNING SWITCH
When the "TUNE" button U of switch (9) is pressed, the frequency
goes up; when the V button is pressed, the frequency goes down.
If it is kept pressed, the frequency changes continuously.
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OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
METHOD OF OPERATION
LISTENING TO RADIO
1. This switches on power (1) for the radio.
2. "BAND" switch (2) is used to select MW (AM) or FM.
3. Use the preset switch or tuning switch (3) to select the station.
4. Adjust the volume and tone as desired.
5. To turn the radio OFF, turn VOL knob (1) to the left until a click
is heard.
METHOD OF AUTOMATIC TUNING
When the "SEEK" switch is pressed, it moves up to higher
frequencies and when it finds a station that can be received, it
stops automatically.
METHOD OF MANUAL TUNING
When the TUNE button U is pressed, the frequency goes up;
when the V button is pressed, the frequency goes down. If it is
kept pressed, the frequency changes continuously.
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EXPLANATION OF COMPONENTS
OPERATION
METHOD OF PRESET
1. Select the desired preset station.
Use the "BAND" button to select MW (AM) or FM, and use the
"TUNE" button to select the frequency of the broadcasting
station.
2. Decide the number of the button to be preset, and keep it
pressed for 2 seconds. The number of the button will be
displayed and the presetting is completed.
3. Repeat Steps 1 to 2 to preset other broadcasting stations.
To change the setting of a preset switch to another station,
repeat Steps 1 to 2.
If the battery is replaced or the power is switched off, all the
preset settings are deleted. Carry out the presetting
operation again.
It is possible to preset 6 AM (MW) stations and 6 FM
stations.
METHOD OF AUTOMATIC MEMORY
If the "AST" button is pressed for 2 seconds, the broadcasting
stations that can be received in the area are called up in turn, and
the broadcasting stations are automatically saved in the preset
memory.
AUTOMATIC SWITCHING RECEPTION OF MONAURAL/STEREO
If the reception of the FM stereo broadcast being received is weak (when you are far from the broadcasting station
or are surrounded by hills), the radio is automatically switched from stereo to monaural to reduce the interference.
When the stereo broadcast becomes stronger, it automatically switches back to stereo broadcasting.
3 - 54
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OPERATION
EXPLANATION OF COMPONENTS
ADJUSTING TIME
1. Turn the radio power ON. If the display shows the frequency,
set the CLOCK button to the time display.
2. To set the time, keep the CLOCK button pressed and
Press the U button to change the minutes
Press the V button to change the hours
PRECAUTIONS FOR USE
Stow the antenna when traveling in places with low overhead clearance.
To ensure safety, always keep the sound to a level where it is possible to hear outside sounds during operation.
If water gets into the speaker case or radio, it may lead to an unexpected failure, so be careful not to get water
on the equipment.
Do not wipe the scales or buttons with solvent such as benzene or thinner. Wipe with a dry soft cloth. If the dirt
cannot be removed easily, soak the cloth with alcohol.
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OPERATION
EXPLANATION OF COMPONENTS
CAR STEREO
(If equipped)
EXPLANATION OF COMPONENTS
Cassette door
Fast forward, rewind buttons
Preset buttons
Metal tape button
Manual tuning buttons
Seek tuning buttons
Band selector button
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Power switch/Volume
Auto-store/Preset scan button
Bass control knob
Treble control knob
Loudness button
Time/Radio display selector button
Tape eject button
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(A)
(B)
(C)
(D)
Band display
Metal tape display
FM stereo reception display
Loudness display
(E) Tape direction display
(F) Preset channel display
(G) Time/Frequency display
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.
OPERATION
EXPLANATION OF COMPONENTS
POWER SWITCH/VOLUME
Turn this knob (1) to the right until it clicks to turn the power on.
Turn it further to increase the volume.
AUTO-STORE/PRESET SCAN BUTTON
Use this button (2) to actuate the preset scan and auto-store
functions.
Auto-store
Each time this button is pressed for more than 2 seconds while
in radio reception, this auto-store function automatically starts to
search for the desired station within a receivable band, and
memorize the frequency in the preset memory. During this
scanning process, the frequency shown in the right side of
display continues to change. This indicates that each frequency
is memorized in the auto-store.
REMARK
The auto-store function cannot be used when the channel display is flashing.
When the display is flashing, the preset scan function is being used.
Preset scan
If this button is pressed for less than 0.5 second while in radio reception, programs from the six preset stations
in the same band will be broadcast one after another for 5 seconds each, starting from No. 1 through No. 6
stations consecutively.
When the desired station is found, press the button again. This stops the preset scan tuning process and switches
to ordinary broadcasting. The same process will be repeated continuously until the button is pressed again.
BASS CONTROL KNOB
Turn this button (3) to the left to reduce the low tones; turn it to the
right to emphasize the low tones.
Direction (a): Low tone reduced
Direction (b): Low tone emphasized
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.
EXPLANATION OF COMPONENTS
TREBLE CONTROL KNOB
Turn this button (4) to the left to reduce the low tones; turn it to the
right to emphasize the high tones.
Direction (a): High tone reduced
Direction (b): High tone emphasized
LOUDNESS BUTTON
This button (5) is used when playing at low volume. It makes it
possible to hear more easily by emphasizing the low tone when the
low tones are weak.
Push button: Actuated (ON)
Push button again: Canceled (OFF)
TIME/RADIO DISPLAY SELECTOR BUTTON
This button (6) is used to switch between the "Radio/tape display"
and the "Time display".
Correcting the time
Press the button to set the time display.
(A) Correcting hour:
Keep the DISP button pressed and press the bottom (H) of
the TUNING button to correct the hour.
(B) Correcting minute:
Keep the DISP button pressed and press the top (M) of the
TUNING button to correct the minute.
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OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
TAPE EJECT BUTTON
This button (7) is used to stop the tape and to eject the cassette.
When this button is pressed, the tape is ejected and the radio
plays.
CASSETTE DOOR
Set the cassette with the exposed portion of the tape on the right
side and insert it through the cassette door (8).
FAST FORWARD, REWIND BUTTONS
These buttons (9) are used to fast-forward or rewind the tape.
Fast-forward/rewind
If you press the button pointing in the same direction as the
lighted arrow indicating the direction of play, the tape will be
fast-forwarded; if you press the button pointing in the opposite
direction, the tape will rewind.
To stop the tape, lightly press the button that is not locked. The
fast-forward or rewind operation will be canceled.
If the fast forward and rewind buttons are pressed at the same
time, the tape will change sides.
PRESET BUTTONS
These buttons (10) are used to call up the broadcast station
frequencies preset in memory for each of buttons No. 1 to No. 6.
It is possible to preset 18 stations (FM: 12; AM: 6) with these
buttons.
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EXPLANATION OF COMPONENTS
METAL TAPE BUTTON
(used also for preset button No. 5)
This button (11) is used when playing a metal or chrome tape. This
button is also used for preset button No. 5. When it is pressed,
"MTL" appears on the display.
MANUAL TUNING BUTTONS
These buttons (12) are used for manual tuning.
When "TUN ∧" button is pressed, the frequency goes up 9 kHz for
AM or 0.1 MHz for FM; when "TUN ∨" button is pressed, the
frequency goes down 9 kHz for AM or 0.1 MHz for FM.
If the button is pressed down and held, the frequency will change
continuously.
SEEK TUNING BUTTONS
These buttons (13) are used to seek tuning.
When the "SEEK UP" button is pressed, the search automatically
goes up; when the "SEEK DOWN" button is pressed, the search
automatically goes down.
When the next station that can be received is found, it
automatically stops.
BAND SELECTOR BUTTON
When this button (14) is pressed, the band is switched between
FM1, FM2, and MW (AM). The band is shown on the display.
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OPERATION
.
OPERATION
EXPLANATION OF COMPONENTS
METHOD OF OPERATION
METHOD OF SETTING PRESET BUTTONS
To listen to a preset station, use band selector button (1) to select
AM, FM1, or FM2, then press the preset switch number to listen to
the desired station.
It is possible to preset six AM stations and 12 FM stations (FM1: 6,
FM2: 6).
1. If you are playing a cassette, press the tape eject button to stop
the tape.
2. Select the station to be preset.
Use band selector button (1) to select MW (AM), FM1, or FM2,
then use the manual tuning button to select the frequency of
the broadcasting station.
3. Press manual memory button (2) or seek tuning button (3).
4. Press preset button (4) of the number to be preset for 2
seconds while the frequency display is being shown on the
display. (The preset channel and frequency are displayed and
the presetting is completed).
5. Repeat Steps 2 to 4 to preset other stations.
REMARK
Use Steps 2 to 4 also when changing the setting of a preset switch to another station.
When the power is disconnected, such as when the battery is replaced, all the settings are deleted, so preset the
stations again.
MANUAL MEMORY BUTTON
Select the station to be preset with manual tuning button (1) or
seek tuning button (2), then keep button No.1 to button No.6 of
button (3) pressed for 2 seconds while the frequency is being
displayed to preset the station.
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EXPLANATION OF COMPONENTS
OPERATION
LISTENING TO RADIO
1. Turn the starting switch ON, then turn power switch (1) ON.
2. Set band selector button (2) to AM or FM.
3. Select the station with the preset buttons or manual tuning
button (3).
4. Adjust the volume, balance, and tone as desired.
5. When turning the radio OFF, turn power switch (1) to the left
until it clicks.
REMARK
To switch to the radio when listening to a cassette, press the cassette eject button to stop the tape.
If you insert a cassette when listening to the radio, the tape will start to play.
LISTENING TO CASSETTE TAPE
1. Turn the starting switch ON, then turn power switch (1) ON.
2. Set the cassette with the exposed portion of the tape on the
right side and push it past the cassette door. The tape will
automatically start playing.
If the arrow indicating the direction of play is pointing to the
right, the top side is being played; if the arrow is pointing to the
left, the bottom side is being played.
When the tape reaches the end, it is automatically reversed
and the other side starts to play.
3. When finished with the tape, press the cassette eject button to
eject the tape and automatically switch to the radio.
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OPERATION
EXPLANATION OF COMPONENTS
REVERSING TAPE
When listening to the tape, press both FAST FORWARD,
REWIND buttons (A) and (B) at the same time lightly.
When this is done, the tape direction display will be reversed.
PRECAUTIONS FOR USE
Stow the antenna when traveling in places with low overhead clearance.
To ensure safety during operations, keep the volume at a level where it is possible to hear other machines.
If water gets inside the speaker case or radio (auto tuning), it may cause a serious problem, take care not to let
water get in these items.
Do not wipe the scales or buttons with solvent such as benzene or thinner. Wipe with a dry soft cloth. If the dirt
cannot be removed easily, soak the cloth with alcohol.
NOTICE
Handling cassette tape
Clean the tape head approx. once a month with a commercially available head cleaning tape.
Do not leave the tape any place where it is exposed to direct sunlight, any place that is excessively dusty, or any place where
there is a magnetic field.
Do not use 120-minute tapes. The tape is thin and it easily gets caught up inside the machine.
If the tape is slack, it easily gets caught up inside the machine. Use a pencil to wind in the tape to remove any slack.
Do not use any cassette tape if the label has started to come off. It may cause defective rotation, or it may be impossible to get
the tape out of the machine.
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OPERATION
EXPLANATION OF COMPONENTS
AIR CONDITIONER
By taking fresh air into the cab through a filter, it is possible to raise the pressure inside the cab. This makes it
possible to provide a pleasant working environment even on dusty jobsites.
GENERAL LOCATIONS ON CONTROL PANEL
(1)
(2)
(3)
(4)
ON/OFF switch
Fan switch
Air conditioner switch
Mode selector switch
(5)
(6)
(7)
DEF switch
RECIRC/FRESH selector switch
Temperature control switch
(C)
(D)
RECIRC/FRESH selector symbol
Temperature bar
Air conditioner monitor
(A)
(B)
Air flow bar
Air conditioner operation symbol
ON/OFF SWITCH
Use this switch (1) to turn the air conditioner ON/OFF.
When the switch is turned ON, the air conditioner monitor displays the setting being used when the switch was
previously turned OFF.
FAN SWITCH
With this switch (2) it is possible to adjust the air flow from the fan to 4 levels.
Press the ∧ switch to increase the air flow; press the ∨ switch to reduce the air flow.
The air flow is shown in air flow bar (A) on the air conditioner monitor.
AIR CONDITIONER SWITCH
Use this switch (3) to actuate the cooling, heating, or dehumidifying functions, or to stop the air conditioner.
When the switch is pressed, air conditioner operation symbol (B) is displayed on the air conditioner monitor. When
the switch is pressed again, the air conditioner is switched OFF and the operation symbol goes out.
3 - 64
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OPERATION
EXPLANATION OF COMPONENTS
MODE SELECTOR SWITCH
Use this switch (4) to select the vents.
There are three combinations of vents: FACE, FACE/FOOT, and
FOOT.
Each time the switch is pressed, the vent display on the air
conditioner monitor changes in the order FACE, FACE/FOOT,
FOOT, FACE.
REMARK
Air also blows out from the defroster vent in FOOT mode.
DEF SWITCH
Use this switch (5) to change the vents to the DEF mode.
When the switch is pressed, the vent display on the air conditioner
monitor changes as shown in the diagram on the right.
When the DEF switch is pressed in any of the FACE, FACE/FOOT,
or FOOT modes, the system changes to the DEF mode. In
addition, when the DEF mode is being used, if the mode selector
switch is pressed, it will return to the mode being used before
switching to the DEF mode.
REMARK
Air also blows out from the foot vent in DEF mode.
RECIRC/FRESH SELECTOR SWITCH
Use this switch (6) to switch between recirculation of the internal air
(RECIRC) or intake of external air (FRESH). When the switch is
pressed, the display of RECIRC/FRESH selector symbol (C) on
the air conditioner monitor changes.
(It changes in the order RECIRC, FRESH, RECIRC.)
RECIRC: Only the air inside the cab is circulated. Use this position
when it is needed to carry out quick heating or cooling of
the cab, or when the outside air is dirty (smells or is
dusty).
FRESH: Fresh air is taken in from the outside for normal heating or
cooling of the cab. Use this position to make the air inside
the cab fresh or to remove the mist from the cab windows.
When the air conditioner takes in fresh air from the
outside, the pressure inside the cab rises and this
prevents the entry of dirt. The higher the position of the
fan switch, the more efficient this becomes.
3 - 65
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EXPLANATION OF COMPONENTS
OPERATION
TEMPERATURE CONTROL SWITCH
Use this switch (7) to adjust the temperature of the air blowing out from the vents. The adjustment can be made to
8 levels from low temperature to high temperature.
The temperature of the air blowing out from the vents is displayed on temperature bar (D) on the monitor. The lower
the number of segments lighted up on the bar, the lower the temperature is.
Press the > switch to raise the temperature; press the < switch to lower the temperature.
Even when the starting switch is turned OFF, the settings of each mode are retained in memory. However, in the
following cases, the settings must be made again.
When the machine has not been used for more than seven days
When the battery voltage is extremely low
When there is abnormal interference from the surrounding area
When the fan switch has been turned OFF (only the air conditioner switch setting is retained)
3 - 66
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OPERATION
EXPLANATION OF COMPONENTS
METHOD OF OPERATION
With the FACE vents, it is possible to adjust the direction of the air flow and to turn it on or off.
However, do not set to the FACE mode with the vents closed.
COOLING
1. Press ON/OFF switch (1) to turn on the air conditioner power.
2. Press fan switch (2) to set the air flow to the maximum.
3. Press temperature control switch (3) to lower the temperature.
4. Press air conditioner switch (4) to set to COOLING.
5. Press RECIRC/FRESH selector switch (5) to set to RECIRC.
6. Press mode selector switch (6) to set the vents to FACE.
7. When the temperature inside the cab goes down, set to the
desired temperature and air flow.
NOTICE
If operations are continued for a long time with the air conditioner set to the lowest temperature and minimum air flow, there is
danger that the receiver drier may freeze.
If it freezes and no cold air comes out, stop using the cooling, and set to a higher temperature and the maximum air flow. Run for
a short time under these conditions, then return to the cooling operation.
HEATING
1. Press ON/OFF switch (1) to turn on the air conditioner power.
2. Press fan switch (2) to set the air flow to the maximum.
3. Press temperature control switch (3) to raise the temperature.
4. Press RECIRC/FRESH selector switch (4) to set to FRESH.
5. Press mode selector switch (5) to set the vents to FOOT.
6. When the temperature inside the cab goes up, set to the
desired temperature and air flow.
REMARK
The heating uses the heat from the engine cooling water, so it is effective only when the cooling water is hot.
3 - 67
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EXPLANATION OF COMPONENTS
OPERATION
DEHUMIDIFYING, DEFROSTING
1. Press ON/OFF switch (1) to turn on the air conditioner power.
2. Press fan switch (2) to set to the desired air flow.
3. Press temperature control switch (3) to set to the desired
temperature.
4. Press RECIRC/FRESH selector switch (4) to set to FRESH.
5. Press mode selector switch (5) or DEF switch (6) to set the
vents to the desired position.
6. Press air conditioner switch (7) to operate the cooling.
REMARK
If the ambient temperature is below 0°C (32°F), the air conditioner cooling may not work. In this case, set to
RECIRC and warm up the inside of the cab, then turn the air conditioner switch ON to operate the cooling.
When defrosting, if the temperature control switch is pressed to set the temperature bar to the maximum (all 8
segments on the bar light up), this will improve the efficiency of removing the frost and preventing mist.
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OPERATION
EXPLANATION OF COMPONENTS
PRECAUTIONS WHEN USING AIR CONDITIONER
To prevent putting any excessive load on the engine or compressor, turn the air conditioner ON only when the
engine is running.
Carry out ventilation from time to time when using the cooling.
When turning the cooling on, if the temperature inside the cab is high, open the doors and windows to bring in
fresh air before starting the air conditioner.
If you smoke when using the cooling, your eyes may sting. If this happens, switch temporarily to cooling and
ventilation to remove the smoke.
When using the air conditioner for a long time, carry out ventilation and cooling once every hour.
Be careful not to cool the cab too much.
For reasons of health, the optimum setting for cooling is considered to be when it feels slightly cool (5 or 6°C (9 or
10.8°F) lower than the ambient temperature) when you enter the cab. Do not make the temperature inside the cab
too low or direct the air flow directly onto your skin.
Be extremely careful to select the appropriate temperature.
When cooling is not being used (off-season)
To prevent leakage of the refrigerant from the air conditioner cooling circuit, operate the air conditioner for several
minutes 2 or 3 times a month during the off-season. If the air conditioner is left for a long time when the refrigerant
is leaking, it may cause internal rust.
INSPECTION AND MAINTENANCE
Even when not using the air conditioner, run the compressor at low speed for several minutes once a week to
prevent the loss of the oil film at various parts of the compressor. (Run the engine at low speed and set the
temperature control lever to the central position.)
Clean the air filter and check the refrigerant. For details, see "CLEAN AIR CONDITIONER AIR FILTER (PAGE
4-29)" and "CHECK REFRIGERANT (GAS) LEVEL (PAGE 4-30)".
To enable the air conditioner to perform to the full and to maintain a pleasant working environment, always contact
your Komatsu distributor to have the air conditioner refilled with refrigerant and to carry out other checks.
3 - 69
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OPERATION
OPERATION
OPERATION
CHECK BEFORE STARTING ENGINE
WALK-AROUND CHECK
Before starting the engine, look around the machine and under the machine to check for loose nuts or bolts, or
leakage of oil, fuel, or coolant, and check the condition of the hydraulic system.
Check also for loose wiring, play, and accumulation of dust in places that get very hot and are exposed to extremely
high temperatures.
WARNING
Always hang the warning tag from the shift lever.
Leakage of oil or fuel, or accumulation of flammable material around the battery or high temperature parts of the engine, such
as the engine muffler or turbocharger, may cause fire. Check carefully, and if any problem is found, repair it or contact your
Komatsu distributor.
Always carry out the following items before starting the engine each day.
1. Check the dump body, frame, tires, cylinders, linkage, and hoses for cracks or excessive wear or play.
Check the dump body, frame, tires, cylinders, linkage, and hoses for cracks or excessive wear or play, and carry out
repairs if any problem is found.
2. Remove dirt from around engine, battery, radiator, and aftercooler.
Check that there is no dirt or dust accumulated around the engine, radiator or aftercooler. Check also that there is
no flammable material (dry leaves, twigs, etc.) accumulated around the battery, or engine, muffler, turbocharger, or
other high temperature parts of the engine. Remove any dirt or flammable materials that are found.
3. Check for leakage of water or oil around engine
Check that there is no oil leakage from the engine or coolant leakage from the cooling system. If any problem is
found, repair it.
4. Check for oil leakage from transmission case, differential case, final drive case, hydraulic tank, brake control oil
tank, hoses, and joints
Check that there is no oil leakage. If any problem is found, repair the place where the oil is leaking.
Check for leakage of oil from the undercover. Check the ground for traces of oil leakage.
5. Check for loose air cleaner mounting bolts.
Check for the loose bolts. If loose, tighten them.
6. Check dump body mount rubber
Check for any cracks, embedded foreign objects, or loose bolts.
7. Check for damage to handrail, loose bolts
Repair any damage and tighten any loose bolts.
8. Check for damage to gauges, lamps on the instrument panel and loose bolts.
Check for damage to the panel, gauges and lamps. If any problem is found, replace the parts. Clean off any dirt on
the surface. Tighten any loose bolts.
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.
OPERATION
OPERATION
9. Check rear view mirror, under view mirror
Check that the mirrors are not damaged. Replace them if they are damaged. Clean the surface of the mirrors and
adjust the angle so that the operator can see the area to the rear and under the machine from the operator's seat.
10. Check for damage to the seat belt and mounting clamps.
Check for damage to seat belt and mounting clamps. If damages are found, replace with the new one.
Check for any loose bolts of the clamps mounting the equipment to the machine. Tighten any loose bolts.
When the belt has been used for a long time, if any external damage or fraying of the belt can be seen, or if the
clamps are broken or deformed, replace the seat belt.
11. Inspect tires.
WARNING
If worn or damaged tires are used, they may burst and cause serious injury
or death.
To ensure safety, do not use the following tires.
Wear:
Tires with a tread grooves of less than 15% of that of a new tire
Tires with extreme uneven wear or with stepped-type wear
Damage:
Tires with damage that has reached the cords, or with cracks in the
rubber
Tires with cut or pulled cords
Tires with peeled (separated) surface
Tires with damaged bead
Leaking or improperly repaired tubeless tires
Deteriorated, deformed or abnormally damaged tires, which do not
seem usable
12. Inspect rims.
WARNING
Check the rims (wheels) and rings for deformation, corrosion and cracks.
In particular, check the side rings, lock rings and rim flanges thoroughly.
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OPERATION
OPERATION
CHECK BEFORE STARTING
Perform the contents of this section before starting the work of each day.
CHECK COOLANT LEVEL, ADD COOLANT
WARNING
Do not open the radiator cap unless necessary. When checking the coolant, always wait for the engine to cool down and check
the reservoir tank.
Immediately after the engine is stopped, the coolant is at a high temperature and the radiator is under high internal pressure.
If the cap is removed to check the coolant level in this condition, there is a hazard of burns. Wait for the temperature to go
down, then turn the cap slowly to release the pressure and remove it carefully.
1. Open the engine hood and check that the coolant in reservoir
tank (1) is between the FULL and LOW marks.
2. If the level is LOW, remove cap (2) and add the engine coolant
up to the FULL mark.
3. If there is no coolant in the reservoir tank, add water to the
radiator through water filler (3) at the top of the radiator, then
add water to the reservoir tank.
4. Check that there is no oil in the engine coolant or any other
problem.
5. After adding coolant, tighten the cap securely.
6. If more coolant is added than normal, then check for water
leakage.
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OPERATION
OPERATION
CHECK DUST INDICATOR
1. Check that the red line in the transparent portion of dust
indicator (1) does not indicate 7.5 kPa (30 INCHES H2O)
(0.076 kg/cm2, 1.1 PSI).
2. If the red line indicates 7.5 kPa (30 INCHES H2O) (0.076 kg/cm
2
, 1.1 PSI), clean or replace the air cleaner element
immediately.
For details of the method of cleaning the element, see
"CHECK, CLEAN OR REPLACE AIR CLEANER (PAGE
4-20)".
3. After checking, cleaning, or replacing, press the top of dust
indicator (1) to return the red line to its original position.
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.
OPERATION
OPERATION
CHECK OIL LEVEL IN ENGINE OIL PAN, ADD OIL
WARNING
Parts and oil are at high temperature immediately after the engine is stopped and may cause serious burns. Wait for the oil
temperature to go down before performing this operation.
1. Open the engine hood cover and check the oil level with the
dipstick (G).
2. Take out the dipstick (G) and wipe off the oil with cloth.
3. Fully insert dipstick (G) into filler pipe (F), then remove it.
4. The oil level should be between the H and L marks on dipstick
(G).
If the oil level is below the L mark, add oil through oil filler (F).
5. If the oil level is above the H mark, open the underguard of the
engine, remove drain plug (1), and loosen drain valve (2) to
drain the excessive oil, and then check the oil level again.
6. If the oil level is correct, tighten the handle of the oil filler cap
securely.
REMARK
When checking the oil level after the engine has been operated, wait for at least 15 minutes after stopping the
engine before checking.
If the machine is at an angle, make it horizontal before checking.
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.
OPERATION
OPERATION
CHECK OIL LEVEL IN TRANSMISSION CASE, ADD OIL
1. Keeping the engine running at low idling after startup, check
the engine oil level with sight gauge (G) while it still remains at
a low temperature (LOW TEMP).
2. If the oil level is low, add oil through oil filler (F).
NOTICE
The oil level changes according to the oil temperature, so check the oil
level after completing the warming-up operation.
When idling during operations or after operations, use the HI TEMP
scale.
CHECK OIL LEVEL IN HYDRAULIC TANK, ADD OIL
WARNING
If the oil filler cap is removed without releasing the internal pressure, oil will spurt out, so turn the oil filler cap slowly to release
the internal pressure, then remove it carefully.
1. Check with sight gauge (G1).
2. If the oil level does not reach the window of gauge (G1), add oil
through oil filler (F).
3. When checking the oil level after adding oil, check with dipstick
(G2).
DRAIN WATER, SEDIMENT FROM FUEL TANK
Loosen valve (1) at the bottom of the fuel tank, and drain the water
and sediment collected at the bottom of the tank together with the
fuel.
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.
OPERATION
OPERATION
CHECK FUEL LEVEL, ADD FUEL
WARNING
When adding fuel, take care that it will not overflow. Overflow of fuel can cause a fire. If any fuel spills, wipe it off.
If fuel spills onto dirt and sand sticking to the machine, remove it and dirt and sand together.
Since fuel is flammable and dangerous, do not bring fire near it.
1. Check with fuel gauge (1) on the machine monitor.
2. After completing operations, add fuel through fuel filler (F) to fill
the tank.
Fuel tank capacity: 384 liters (101.45 US gal)
3. After adding fuel, tighten the cap securely.
REMARK
If the breather hole in the cap becomes clogged, the pressure inside the tank will go down and the fuel may not
flow, therefore clean the breather hole from time to time.
To prevent air from being sucked into the engine, do not let the level in the fuel tank go down too low.
CHECK WHEEL HUB BOLTS, TIGHTEN
Check for loose wheel hub bolts (1). If any are found, tighten them.
Tightening torque: 824 to 1030 Nm
(84 to 105 kgm, 607.6 to 759.5 lbft)
Insert a socket wrench in a pipe, and apply a force of 932 N (95 kg)
at a point 1 m from the fulcrum to give a tightening torque of 932 Nm
(95 kgm, 687.1 lbft).
When tightening the hub bolts after replacing the tires, travel for 5
to 6 km, then check the tightening torque to ensure that there are
no loose bolts.
If any wheel bolt is broken, replace all the wheel bolts for that
wheel.
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OPERATION
OPERATION
CHECK CENTRAL WARNING LAMP, ALARM BUZZER, MONITOR LAMPS AND METERS
Before starting the engine, set the starting switch in the ON position and check that the machine monitor operates
as follows.
The central warning lamp lights up for 2 seconds, then goes off.
The alarm buzzer sounds for 2 seconds, then stops.
The monitor lamps light up for 2 seconds, then go off for 1 second.
The gearshift indicator displays "88" for 2 seconds, then goes off for 1 second.
The meters start the operations after the system is checked for 3 seconds.
The character display displays "KOMATSU" for 3 seconds.
If the machine monitor does not operate as explained above, there is probably a failure, so please contact your
Komatsu distributor for inspection.
CHECK BRAKING EFFECT
Check if the braking capacity of the parking brake, foot brake, and retarder brake.
If any abnormality is found, ask Komatsu distributor to repair.
CHECK EMERGENCY STEERING
Check manual emergency steering
1. Turn starting switch key to the ON position.
2. Turn emergency steering switch (1) ON, and check that the
steering wheel can be operated.
If the steering wheel cannot be operated, please contact your
Komatsu distributor.
Check auto-emergency steering
1. Turn the starting switch key to the START position and start the
engine.
2. Check that the brake oil pressure caution lamp is OFF, then
pull retarder control lever (2) fully and stop the engine.
3. Turn starting switch key to the ON position.
4. Check that the emergency steering motor is actuated and the
steering can be operated 1 sec. after parking brake switch (3)
is set to the TRAVEL position.
CHECK BACKUP ALARM
1. Turn the engine starting switch to the ON position.
2. Place the gear shift lever in the R position and check that the backup alarm is working.
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OPERATION
OPERATION
CHECK ELECTRIC WIRING
WARNING
If the fuses frequently blow or if there are traces of short circuits in the electrical wiring, locate the cause and immediately
perform repairs, or contact your Komatsu distributor for repairs.
Keep the top surface of the battery clean and check the breather hole in the battery cap. If it is clogged with dirt or dust, wash
the battery cap to clean the breather hole.
Check for damage and wrong capacity of the fuse and any sign of disconnection or short circuit in the electrical
wiring. Check also for loose terminals and tighten any loose parts.
Check the wiring of the "battery", "starting motor"and "alternator"carefully, in particular.
Always check if there is any accumulation of flammable material around the battery, and remove such flammable
material.
Please contact your Komatsu distributor for investigation and correction of any problems found.
CHECK INFLATION PRESSURE OF TIRES
Measure the inflation pressure with a tire pressure gauge, while the tires are cool, before starting work.
Check for damage or wear to the tires and the rims.
Check for loose wheel hub bolts.
The proper inflation pressure is shown below.
Tire size
Inflation pressure [MPa (kg/cm2, PSI)]
Front
Center
Rear
23.5-R25 (standard)
0.44 (4.5, 63.9)
0.44 (4.5, 63.9)
0.44 (4.5, 63.9)
750/65 R25 (30/65 R25) (if equipped)
0.34 (3.5, 49.7)
0.40 (4.1, 58.2)
0.40 (4.1, 58.2)
NOTICE
If the tires are used when the inflation pressure is less than the value given in the table above, the rim may be damaged.
Always keep the tire inflation pressure within +0 to +0.03 MPa (0.3 kg/cm2, 4.3 PSI) of the value in the table above.
CHECK WATER SEPARATOR
The water separator and fuel prefilter (1) are made one and
composed of (2) to (4) in the lower section.
1. Water and sediment on the bottom can be checked through
transparent cap (2). If there is water or sediment, prepare a
container to receive it under drain hose (4).
2. Loosen drain valve (3) to drain the water.
3. If fuel starts flowing out through drain hose (4), close valve (3)
immediately.
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.
OPERATION
OPERATION
DOES BODY POSITIONER OPERATE NORMALLY?
1. Turn the starting switch key to the START position and start the
engine.
2. Operate the dump control lever to the RAISE position, then
release it.
Check that the dump body stops before the end of the stroke.
REMARK
If the dump body reaches the end of the stroke, the contact of the
body will cause an impact. The body positioner is functioning, so
the dump body stops without any impact.
ARE THE CAB MOUNTING BOLTS AND PINS ARE FREE FROM LOOSENESS AND BREAKAGE?
Check that there are no loose cab mounting bolts (1) (left, right: 4
each). Tighten any loose bolts.
Tightening torque: 245 to 309 Nm{25 to 31.5 kgm, 180 to 227 lbft}
Check that there are no loose or broken cab mount pins (2) (left,
right: 1 each).
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.
OPERATION
OPERATION
ADJUSTMENT BEFORE OPERATION
ADJUSTING OPERATOR'S SEAT
WARNING
Park the machine in a safe place and stop the engine when carrying out adjustment of the operator's seat.
Adjust the seat before starting operations or when changing operators.
Adjust the position of the operator's seat so that you can depress the brake pedal fully with your back against the seat backrest.
(A) Fore-and-aft adjustment
Move lever (1) up, move the seat to the desired position, then
release the lever.
Fore-and-aft adjustment:180 mm (7.1 in)
[10 mm (0.4 in) x 18 stages]
(B) Adjusting seat angle
Move lever (2) up and push down on the rear of the seat to tilt it
backward.
Move lever (2) down and push down on the front of the seat to tilt
it forward.
Adjustment range: 13 degrees (Front tilt, rear tilt: 4 stages each)
(C) Setting seat for operator's weight
Sit on the seat and adjust the strength of the suspension with
valve (3).
Adjustment range (Target): 50 kg (110 lb) to 120 kg (265 lb)
Push: Suspension is strengthened.
Pull: Suspension is weakened.
(D) Adjusting backrest angle
Move lever (4) up and move the backrest to the front or rear.
When doing this, keep your back pressed against the seat back.
If your back is not against the seat back, the seat back may spring back suddenly.
Adjustment range: 66° to the front (3° x 22 stages)
72° to rear (3° x 24 stages)
NOTICE
If the seat back is reclined too far, the headrest may hit the rear glass, so move it to a position where it does not contact the glass.
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.
OPERATION
OPERATION
(E) Seat height adjustment
Move lever (2) up or down to move the seat up or down as desired. Lever (2) is also used for adjusting the seat
angle, so set the seat to the desired height while adjusting the angle.
Adjustment range: 60 mm (2.4 in)
(F) Adjusting headrest height
Move the headrest up or down to the desired height.
Adjustment range: 50 mm (2.0 in)
(G) Adjusting headrest angle
Rotate the headrest to the front or rear.
(H) Lumbar support
Turn grip (5) to adjust the tension applied to the lower back.
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.
OPERATION
OPERATION
ADJUST SEAT BELT
WARNING
Before fastening the seat belt, check that there is no problem in the securing brackets or belt. If there is any wear or damage,
replace.
Even if there appears to be no problem in the seat belt, replace the seat belt once every 3 years. The date of manufacture is
woven on the reverse side of the belt.
Adjust and fasten the seatbelt before starting to travel.
Always use the seatbelt when traveling.
Do not use the seat belt with either half of the belt twisted.
Fastening and removing belt
Fasten the belt so that it is tight without being too tight.
1. Sit on the seat, depress the brake pedal fully, and adjust the
seat so that your back is pressed against the backrest.
2. Sit in the seat, pull the right side of the belt, then insert tongue
(1) into buckle (2) until a click is heard.
3. When removing the belt, press the red button in buckle (2) to
free the belt.
Fit the belt so that it follows your body and is not twisted.
ADJUST STEERING WHEEL TILT
WARNING
Always stop the machine before adjusting the tilt of the steering wheel.
The tilt of the steering wheel can be adjusted to the front and rear,
and up and down. Pull lever up and set the steering wheel to the
desired position, then push lever down to lock the steering wheel
securely in position.
Amount of adjustment: Front/rear: 80 mm/80 mm (3.2 in/3.2 in)
(from center of steering wheel)
Up: 33 mm (1.3 in)
Down: 17 mm (0.7 in)
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OPERATION
OPERATION
ADJUSTING MIRROR
WARNING
Be sure to adjust the mirrors before starting work. If they are not adjusted properly, you cannot secure the visibility and may be
injured or may injure someone seriously.
Loosen mirror securing bolt (1), screw (2) and nut (3) and adjust the
mirror position the way it assures the best view from the operator's
seat.
Adjust the position and angle of each mirror so that it reflects a
sight 200 mm above the ground and up to 1500 mm. In the
adjustment, make sure that part of the dump truck's image also
comes into view.
View Range
Mirror A: Shaded area (A) should be in view.
Mirror B: Shaded area (B) should be in view.
Mirror C: Shaded area (C) should be in view.
Mirror D: Shaded area (D) should be in view.
Mirror E: Shaded area (E), tire's ground contact point (G') and
ground (G'') should be in view.
Mirror F: Shaded area (F) should be in view.
Mirror G: Shaded area (G), tire's ground contact point (G') and
ground (G'') should be in view.
Rear Monitor (optional): Shaded area (H) should be in view.
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OPERATION
OPERATION
OPERATIONS, CHECKS BEFORE STARTING
WARNING
When starting the engine, check that the shift lever is set in the N
(neutral) position and that the parking brake switch is at PARKING
position.
Before standing up from the operator's seat, place the shift lever at N
(neutral) position, and set the parking brake switch to the PARKING
position.
1. Check that parking brake switch (1) is in the PARKING
position.
2. Check that gear shift lever (2) is at the N position.
REMARK
If the starting switch is turned to the ON position when the shift
lever is not at the N position, the shift lever position pilot lamp and
central warning lamp will flash, and the alarm buzzer will sound.
3. Check that dump lever (3) is at the HOLD position.
4. Check that there is no abnormality in the machine monitor
when starting switch (4) is turned to the ON position.
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OPERATION
OPERATION
STARTING ENGINE
WARNING
Start the engine only after sitting down in the operator's seat.
Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may cause a serious bodily injury
or fire.
Check that there are no persons or obstacles in the surrounding area, then sound the horn and start the engine.
Never use starting aid fluids as they may cause explosions.
Exhaust gas is toxic. When starting the engine in confined spaces, be particularly careful to ensure good ventilation.
NOTICE
Do not accelerate the engine sharply until it is warmed up.
Do not operate the starting motor continuously for more than 20 seconds.
If the engine fails to start, wait for 2 minutes or so, and then try to start again.
When starting the engine, do not depress the accelerator pedal. Even if the accelerator pedal is depressed just after the engine
is started, the engine speed is limited by the turbo protect function. After the turbo protect time, however, the engine speed
rises sharply and the turbocharger may be damaged.
1. Turn the key of starting switch (1) to the ON position.
The preheater pilot lamp lights up, depending on the engine
water temperature, and the engine is preheated. After the
pre-heating time, the preheater pilot lamp goes off.
The pre-heating times are as shown below.
Engine water temperature
Pre-heating time
above - 5°C (23°F)
–
- 5°C to - 20°C (23°F to - 4°F)
20 to 40 sec
below - 20°C (- 4°F)
40 sec
REMARK
When the key of the starting switch is turned to the ON position, if the engine water temperature is -5 °C or higher,
the engine is not pre-heated. At this time, the engine can be started without pre-heating operation.
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OPERATION
OPERATION
2. After the preheater pilot lamp goes off, turn the key of the
starting switch to the START position, and the engine will start.
REMARK
When starting the engine, the monitor may flash while the starting
motor is turning, but if the monitor lamp goes out after the engine
is started, there is no problem.
3. After the engine starts, release the key of the starting switch.
REMARK
If the engine fails to start, return the key of the starting switch to the
OFF position, and then start the operation again from step 1. If the
starting switch is not returned to the OFF position, the automatic
preheater does not operate.
4. Just after the engine starts, do not depress the accelerator pedal but run the engine idle at low speed for at least
15 seconds.
When the engine is started for the first time after the engine oil or engine oil filter is replaced, continue the low
idle run for at least 20 seconds to circulate the engine oil in the engine.
REMARK
Since the turbocharger rotates at very high speed, it is seized if not lubricated well. To prevent this, the turbo
protect mechanism works for a certain time just after the engine starts, depending on the engine water
temperature.
Engine water temperature
Turbo protect time
above 10°C (50°F)
0 sec
-10°C to 10°C (14°F to 50°F)
0 to 5 sec
below -10°C (14°F)
5 sec
Just after the engine starts, the injection characteristics are changed for a certain time to keep the low idle speed
a little high, depending on the engine water temperature. The engine acceleration characteristics are also
changed so that the engine will be accelerated moderately.
Engine water temperature
Injection characteristics
change time
above 20°C (68°F)
0 sec
0°C to 20°C (32°F to 68°F)
0 to 6 sec
-20°C to 0°C (-4°F to 32°F)
6 to 12 sec
-30°C to -20°C (-22°F to -4°F)
12 to 15 sec
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.
OPERATION
OPERATION
OPERATIONS, CHECKS AFTER STARTING ENGINE
BREAKING-IN THE MACHINE
CAUTION
Your Komatsu machine has been thoroughly adjusted and tested before shipment. However, operating the machine under severe
conditions at the beginning can adversely affect the performance and shorten the machine life.
Be sure to break-in the machine for the initial 100 hours (as indicated by the service meter).
During break-in operations, follow the precautions described in this manual.
Idle the engine for 5 minutes after starting it up.
Avoid operation with heavy loads or at high speeds.
Immediately after starting the engine, avoid sudden starts, sudden acceleration, unnecessary sudden stops, and
sudden changes in direction.
WARMING-UP OPERATION
NOTICE
Do not accelerate the engine sharply during the warming-up operation. Sharp acceleration can shorten the service life of the
engine parts.
Do not continue the low idle or high idle operation for more than 20 minutes. It can cause oil leakage from the turbocharger.
1. After the engine starts, run it for 5 minutes in the range between low idling and medium speed to warm it up.
2. Check that the engine water temperature gauge pointer is in
the white range (above (A)).
If the engine water temperature gauge pointer is in the white
range (above (A)), the engine is warmed up.
If the engine water temperature gauge pointer has not reached
the white range (above (A)), continue the warming-up
operation more.
After finishing the warming-up operation, check that the
machine monitor is normal.
If the machine monitor is abnormal, ask your Komatsu
distributor for inspection/repair.
REMARK
While the AISS switch is in the AUTO position and the engine water temperature is low, the low idle speed is set a
little high automatically.
3. Check that the steering operation is normal, the lamps light up and go off normally, the horn sounds, and the
exhaust gas color, sound, and vibration are normal. If any of them is abnormal, ask your Komatsu distributor for
inspection/repair.
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OPERATION
OPERATION
CANCELING DUMP BODY HOLD CONDITION
WARNING
If the HOLD is canceled when the dump body is raised, the body will go down under its own weight. This is very dangerous.
Always lower the dump body before stopping the engine.
After the engine has been started, if the dump lever is operated to HOLD, the dump body is held in position until the
lever is operated to FLOAT, RAISE, or LOWER.
After starting the engine, the body pilot lamp lights up, so operate the dump lever from HOLD to FLOAT to cancel
the body hold condition. With this operation, when the dump body moves to the FLOAT condition, the body pilot
lamp goes out.
STOPPING ENGINE
NOTICE
If the engine is suddenly stopped without allowing it to cool down, there
is danger that the life of the engine parts will be shortened, so never
stop the engine suddenly except in emergency.
Allow the engine to cool down gradually before stopping it.
After the engine is stopped, the dump body is held at the same position,
regardless of the position of the dump lever. Set the dump lever to the
FLOAT position, lower the dump body, then stop the engine.
1. Set the shift lever to the N position, then set the parking brake
switch to the PARKING position.
2. Lower the dump body and set the dump lever to the HOLD
position.
3. Run the engine at low idle for about 5 minutes to cool down
gradually.
4. Turn the key of starting switch (1) to the OFF position to stop
the engine.
5. Remove the key from starting switch (1).
CHECKS AFTER STOPPING ENGINE
1. Walk around the machine and check the work equipment, bodywork, and undercarriage, and check also for oil
and water leakage.
2. Fill the fuel tank.
3. Check the engine compartment for paper and debris. Clean out any paper and debris to avoid a fire hazard.
4. Remove any mud affixed to the undercarriage.
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.
OPERATION
OPERATION
MOVING MACHINE OFF (FORWARD, REVERSE), STOPPING
MOVING MACHINE FORWARD
WARNING
When moving the machine off, check that the area around the machine
is safe, then sound the horn before starting.
Do not allow people to get near the machine.
Clear the machine's travel path of any obstacle.
Pay a particular attention to the blind spot at the rear of the machine,
when traveling the machine in reverse.
1. Check that there is no warning display on the machine monitor.
2. Fasten the seat belt.
3. Check that dump lever (1) is at the FLOAT position and that the
dump body pilot lamp is out.
If the dump body pilot lamp is lighted up, operate the dump
lever to the HOLD position, then operate it to the FLOAT
position to cancel the dump body HOLD condition.
4. Depressed the brake pedal fully. Then set parking brake switch
(2) to the TRAVEL position to release the parking brake.
REMARK
If the engine is stopped with the parking brake switch at TRAVEL,
the parking brake will be applied even though the switch is at
TRAVEL. In this case, operate the switch to PARKING, and then
move it back to TRAVEL to cancel the parking brake.
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.
OPERATION
5. Check that retarder pilot lamp (3) is not lighted up, then set shift
lever (4) to the desired position.
NOTICE
When operating the shift lever, be sure to set it in position securely.
If the lever is not placed in position properly, the shift position display
on the panel may go out and the transmission warning monitor lamp
may light up.
Always release the accelerator pedal before shifting from N to R or F.
6. Depress accelerator pedal (5) to move the machine off.
NOTICE
If the gearshift lever is shifted to a position other than N when the
parking brake has not been released, the central warning lamp will flash
and the alarm buzzer will sound.
If the gearshift lever is shifted to a position other than N when the dump
lever is at a position other than FLOAT or the body is raised, the central
warning lamp will flash and the alarm buzzer will sound.
Do not operate the gearshift lever with the accelerator pedal depressed.
This will cause a big shock and will also reduce the service life of the
machine.
3 - 90
OPERATION
.
OPERATION
OPERATION
MOVING MACHINE IN REVERSE
WARNING
When switching between FORWARD and REVERSE, check that the new
direction of travel is safe.
There is a blind spot behind the machine, so use extreme caution when
reversing the machine.
Always stop the machine completely before shifting between
FORWARD and REVERSE.
Operate shift lever (1) to the R1 or R2 position, then gradually
depress accelerator panel (2) to move the machine off.
NOTICE
The machine cannot travel in reverse if the dump body is raised. Lower
the dump body, set the dump lever to the FLOAT position, then operate
the shift lever to the "R1" or "R2" position.
When shifting between FORWARD and REVERSE, stop the machine
completely and run the engine at low idling when shifting the lever.
After moving the shift lever, do not accelerate until you detect that the
transmission clutch has engaged.
Do not operate the shift lever with the accelerator pedal depressed.
This will cause a big shock and will also reduce the service life of the
machine.
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.
OPERATION
OPERATION
STOPPING MACHINE
WARNING
Avoid stopping suddenly. Give yourself ample room when stopping.
If the foot brake is used repeatedly or is kept depressed for a long time,
the brake may overheat and its life will be shortened.
If the parking brake is used to stop the machine, the brake will be
damaged. Do not use the parking brake except when stopping in
emergencies or when parking the machine after stopping it.
NORMAL STOPPING
Release accelerator pedal (1), and depress brake pedal (2) to stop
the machine.
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.
OPERATION
OPERATION
STOPPING IN EMERGENCY
If there should be a failure in the foot brake, stop the machine as
follows.
WARNING
When the machine stops, put blocks under the tires immediately.
Immediately after making an emergency stop, the parking brake disc
will be at high temperature, so wait for it to cool before carrying out
repair or adjustment. Ask Komatsu distributor for repair and
adjustment.
1. Pull retarder control lever (1) fully to apply the retarder.
2. If operating retarder control lever (1) does not give enough
braking force, set parking brake switch (2) to PARKING to
apply the parking brake.
3. If an emergency stop has been made, put blocks under the tires immediately, then try to find the cause, and
repair it on site.
If the parking brake has been used to make an emergency stop, it is necessary to re-adjust the parking brake.
Contact your Komatsu distributor for adjustment.
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.
OPERATION
OPERATION
SHIFTING GEAR
WARNING
Do not move the gear shift lever to the N position when the machine is traveling or when it is traveling down a slope. Always place
the transmission in gear before traveling.
If the transmission is in Neutral, the engine cannot provide any braking effect and the steering wheel will become heavier. In
addition, there will be lack of cooling oil for the retarder, so there is danger that it will overheat or that the actuation of the brake
will be poor.
There may also be damage to the transmission or other parts of the power train, and there is danger of unexpected accidents.
When shifting gear, do as follows.
This machine has an automatic transmission, so set gear shift
lever (1) to the desired position, and the transmission will
automatically shift to a position to match the travel speed.
When the dump body is raised, if the shift lever is at the D position,
the transmission is fixed in 2nd, and if it is at positions 1 - 5, the
transmission is fixed in 1st. Keep the dump body lowered when
traveling.
NOTICE
When shifting between FORWARD and REVERSE, stop the machine
completely, and run the engine at low idle when shifting the lever. After
moving the gear shift lever, do not depress the accelerator until you
detect that the transmission clutch has engaged.
Do not operate the gear shift lever with the accelerator pedal depressed.
This will cause a big shock, and will also reduce the service life of the
machine.
SHIFTING UP
1. When accelerator pedal (2) is depressed to accelerate the
machine, the lockup clutch is engaged to shift the transmission
to direct drive.
2. If the machine is accelerated further, the transmission will
automatically shift up.
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.
OPERATION
OPERATION
SHIFTING DOWN
If accelerator pedal (2) is released, the machine speed will be
reduced, and the transmission will automatically shift down.
DOWN SHIFT INHIBIT
If the shift lever is operated when the machine is traveling, and the travel speed is faster than the maximum speed
for each gear position, the transmission is not shifted immediately but is shifted down when the travel speed drops.
This prevents overrunning of the engine.
SHIFTING DOWN WHEN USING FOOTBRAKE
When using the footbrake to reduce the travel speed, the transmission is kept in 3rd speed for longer than normal
to reduce the shock when shifting gear.
OVERRUN PROTECTION DEVICE
If the engine speed reaches the red range on the engine tachometer during operation, the warning lamp and buzzer
will give a warning signal. If the machine travel and engine speed continues to increase the brakes will automatically
apply and slow the travel speed of machine to prevent over-speeding condition of the engine.
3 - 95
.
OPERATION
OPERATION
TRAVELING DOWNHILL
When traveling downhill, travel at a safe speed which matches the width of the road, the condition of the road
surface, and other conditions of the jobsite.
WARNING
When the machine stops, put blocks under the tires immediately.
For the maximum permissible speed when traveling downhill using the retarder, see the brake performance graph for the
downhill distance and grade. Traveling continuously downhill at a speed greater than the maximum permitted speed on the
brake performance graph is dangerous as the retarder brake may be damaged.
If the retarder oil temperature caution lamp on the machine monitor lights up when the retarder is being used, shift down to
travel downhill. (When this happens, the central warning lamp lights up and the alarm buzzer sounds.)
If the caution lamp does not go out even when the transmission is shifted down, stop the machine immediately, set the shift
lever to the N position, run the engine at 1800 rpm, and wait for the caution lamp to go out.
If the retarder loses its effect when it is used for traveling downhill, do as follows.
1. Release the retarder control lever completely, then operate the retarder control lever again.
2. If the retarder still has no effect even when the retarder control lever is operated again, return the retarder control lever
completely to the released position, then depress the brake pedal to stop the machine, and contact your Komatsu distributor
for repairs.
Operate the retarder slowly. If the brake is applied suddenly, there is danger that the tires will slip.
Do not move the gear shift lever to the N position when the machine is traveling or when it is traveling down a slope. Always
place the transmission in gear before traveling.
o If the transmission is in Neutral, the engine cannot provide any braking effect and the steering wheel will become heavier.
In addition, there will be lack of cooling oil for the retarder, so there is danger that it will overheat or that the actuation of the
brake will be poor.
o There may also be damage to the transmission or other parts of the power train, and there is danger of unexpected accidents.
NOTICE
If the retarder control lever is operated when traveling downhill, the transmission can be shifted down sooner than with normal
deceleration. It is also possible to travel without shifting up.
Do not accelerate or shift up when using the retarder. The engine speed will rise and this may cause the alarm buzzer to sound
and the central warning lamp to flash.
3 - 96
.
OPERATION
OPERATION
1. Before starting to travel downhill, release accelerator pedal (1)
and operate retarder control lever (2) to slow the machine
down.
2. Move the shift lever to a position (5, 4, 3, 2) that matches the
maximum permissible speed for the retarder brake
performance.
3. When traveling downhill, operate retarder control lever (2), run
the engine at a speed of at least 1800 rpm, and travel so that
the retarder brake oil temperature gauge is in the white range.
3 - 97
.
OPERATION
OPERATION
BRAKE PERFORMANCE CURVE
Method of using graph
Example: Machine equipped with exhaust brake
Downhill distance: 1500 m (4921 ft)
Travel resistance: -11% [grade resistance: -13%, rolling resistance: 2%]
Load: 27 tons
Obtain the maximum permissible speed and the transmission speed range from the graph when traveling downhill
under the above conditions.
1. Use the brake performance curve for downhill distance of 1,500 m (4,921 ft).
2. Starting from point (A) which corresponds to the overall weight of the machine, draw a perpendicular line down.
3. Take the point where it crosses the line for travel resistance -11% as (B) and draw a horizontal line.
4. Take the point where it crosses the performance curve as (C), and draw a perpendicular line down. Take the
point where this line crosses the travel speed scale as (D).
5. The following information can be obtained from this procedure.
From point (D): Maximum permissible speed = 24 km/h (14.9 MPH)
From point (C): Speed range = F4
This maximum permissible speed is one guideline determined from the retarder brake performance, so on an actual
jobsite, determine a safe travel speed below the maximum permissible speed to match the conditions of the jobsite
so that the retarder brake oil temperature gauge is always in the white range when traveling.
3 - 98
.
OPERATION
OPERATION
Brake performance
[Downhill distance: 450 m (1476 ft)]
Brake performance
[Downhill distance: 600 m (1968 ft)]
3 - 99
.
OPERATION
Brake performance
[Downhill distance: 900 m (2952 ft)]
Brake performance
[Downhill distance: 1500 m (4921 ft)]
3 - 100
OPERATION
.
OPERATION
OPERATION
Brake performance
[Downhill distance: Continuous]
3 - 101
.
OPERATION
OPERATION
STEERING THE MACHINE
WARNING
If the machine is turned at high speed or on a steep slope, there is danger
that it will turn over, so do not operate the steering in such conditions.
CAUTION
Do not continue to turn the steering wheel when it has been turned fully
to the left or right. Continuing to turn the steering wheel will make the
oil temperature in the circuit rise and cause overheating.
When the steering nears the end of the turn on the left or right, turn the
steering wheel more slowly. Turning the steering wheel suddenly to the
end of the turn will cause damage to the machine.
To turn the machine when traveling, turn steering wheel (1) in the direction of the turn.
When traveling around a curve, release the accelerator pedal before entering the curve, shift down to a lower speed
range, then depress the accelerator pedal to travel around the curve. Never coast around the curves at high speed.
REMARK
The angle of the steering wheel may change (the position of the spoke may change slightly) when the machine
is traveling, but this is not a failure.
If force is applied to the steering wheel when the tires have been turned fully to the left or right, the steering wheel
will turn a little at a time, but this is not a failure.
3 - 102
.
OPERATION
OPERATION
OPERATION USING DIFFERENTIAL LOCK
When traveling on roads where the tires are likely to slip, avoid sudden changes in speed, and use the differential
lock (inter-axle differential lock) when traveling.
Operate the inter-axle differential lock switch to actuate the differential lock 5 to 10 m (16 ft 5 in to 32 ft 10 in) before
entering a road surface where the tires are likely to slip.
It is important to actuate the differential lock before the tires slip in order to obtain the full ability of the differential lock
and also to reduce wear of the tires.
NOTICE
As far as possible, do not use the differential lock (inter-axle differential lock) when turning.
If the differential lock is used when turning:
It will be more difficult to operate the steering wheel.
It will become more difficult to turn than when the differential lock is not used, and in some cases, it may not be possible to steer
around curves which were previously possible.
When the differential lock is actuated, the wheel on the inside of the curve tries to turn at the same speed as the wheel on the
outside, so the tire may spin and there may be premature wear of the tire or damage to the road surface.
METHOD OF USING INTER-AXLE DIFFERENTIAL LOCK
Set the inter-axle differential lock switch to MANUAL before entering soft ground or a road surface where the tires
are likely to slip, and actuate the inter-axle differential lock. When traveling again on hard ground, cancel the switch.
REMARK
When the inter-axle differential lock is at AUTO, if the tires slip and there is a difference in rotation between the front
and rear tires, the inter-axle differential lock is automatically actuated.
3 - 103
.
OPERATION
OPERATION
WHEN TIRES ARE STUCK IN GROUND
If the wheels get stuck, to stop the wheels from spinning, do as follows.
If it is impossible to get the machine out even when repeating the procedure below, use a bulldozer to tow the
machine out.
1. Release the accelerator pedal to stop the wheels from spinning.
2. Actuate the inter-axle differential lock.
3. Set the shift lever to position "5" and raise the engine speed.
4. Release the accelerator pedal and brake pedal.
5. Set the shift lever to position R1 and raise the engine speed.
6. Repeat Steps 1 - 5 to move the machine backwards and forwards until it can escape.
LOADING OPERATIONS
When using a large wheel loader to load large rocks, if the rocks are loaded directly into the dump body parts of the
dump body may be deformed. To prevent this, when loading large rocks, first load sand or soil to act as a cushion,
then load the rocks on top of this to reduce the impact on the dump body.
In addition, when loading rocks that exceed the following conditions, install the optional dump body reinforcement
plate.
Rocks with one side over 0.3 m (11.8 in)
Rocks of hardness more than 4.5 (Mohs scale)
Rocks with a weight of more than 150 kg (331 lb)
When transporting steel ingots
NOTICE
When traveling, always set the dump lever to the FLOAT position regardless of whether the dump body is empty or loaded.
If the dump lever is not at the FLOAT position and the shift lever is not at the N position, the central warning lamp will flush and
the alarm buzzer will sound.
3 - 104
.
OPERATION
OPERATION
DUMP OPERATIONS
WARNING
When dumping a load, always carry out the dumping operation in
accordance with the signals from the flagman.
When dumping large rocks, operate the dump body slowly.
Do not load the dump body while it is still raised.
When carrying out inspection with the dump body raised, always use
the body pivot pins, set the dump lever to the HOLD position and lock
it securely. For details, see "BODY PIVOT PIN (PAGE 3-45)".
Operate the dump body as follows.
1. Place shift lever (1) at the N position, and set parking brake
switch (2) to the PARKING position.
2. Move dump lever (3) to the RAISE position, then depress the
accelerator pedal to raise the dump body.
If the dump lever is released when it is at the RAISE position,
it is held at the RAISE position and the dump body will continue
to rise.
The dumping speed increases in proportion to the engine
speed.
3. When the dump body rises to the previously set position, dump
lever (3) returns to the HOLD position. The dump body is held
at that position.
If it is necessary to raise the dump body further, operate dump
lever (3) to the RAISE position and the dump body will rise. If
dump lever (3) is released, dump lever (3) will return to the
HOLD position and the dump body will stop at that position.
3 - 105
.
OPERATION
4. When dump lever (3) is moved to the LOWER position, the
dump body will start to move down.
5. When the dump body has moved down a certain distance,
move dump lever (3) to the FLOAT position. (When the lever is
released, it will return to the FLOAT position.) The dump body
will then move down under its own weight.
When raising the dump body, let the accelerator pedal back
near the maximum angle to avoid any impact load on the
hydraulic circuit or hoist cylinders.
When the dump body is raised, if the shift lever is at the D
position, the transmission is fixed in 2nd, and if it is at positions
1 - 5, the transmission is fixed in 1st. Keep the dump body
lowered when traveling.
3 - 106
OPERATION
.
OPERATION
OPERATION
CAB TILT OPERATION
WARNING
To prevent serious injury or death if the cab comes down, always observe the following strictly when tilting the cab.
Precautions before performing cab tilt operation
Perform the cab tilt operation on a flat place.
To prevent interference between the cab and machine body when performing the tilt operation, set the machine facing directly
to the front and secure the front and rear frames with the articulation lock.
Set the parking brake switch to the "PARKING" position to apply the parking brake.
Lock the dump control lever with the dump lever lock knob.
Put blocks under the tires to prevent the machine from moving.
Do not perform the cab tilt operation in the strong wind.
Precautions when performing cab tilt operation
Do not operate the cab tilt when the machine is loaded.
Do not stand under the cab during the cab tilt operation.
While the cab is tilted up, fix it with the lock bar securely.
While the cab is tilted up, do not ride on or get off it.
While the cab is tilted up, do not operate the gear shift lever or dump control lever.
Do not start the engine while the cab is tilted up. If it is necessary to start the engine when carrying out inspection, check first
that there is no one under the cab.
Do not subject to the machine to any large impact force while the cab is tilted up.
When lowering the cab by using the tilt cylinder, do not lower the hydraulic pressure at a time but lower it gradually to adjust
the lowering speed of the cab.
The lock bar is set on the left inside of the engine hood. After using it, be sure to return it.
3 - 107
.
OPERATION
WHEN USING CRANE
1. Remove lock bolt (2) from guard (1) at the rear of the cab, then
lock guard (1) in position with rod (3).
2. Remove pin (4) in the mount at the rear of the cab, and insert
it in hole (6).
3. Remove cab mounting bolts (7) (8 pieces).
4. Install the sling to hooks (8) installed to the front of the cab (on
both right and left sides) and lift up the cab.
5. After tilting up the cab, fix it with lock bar (9).
6. Make sure that lock bar (9) is installed in the correct direction
and lock it securely with lock (10).
7. After returning the cab to its original position, insert pin (4) in
hole (5).
3 - 108
OPERATION
.
OPERATION
OPERATION
WHEN USING TILT CYLINDER
(If equipped)
1. Remove lock bolt (2) from guard (1) at the rear of the cab, then
lock guard (1) in position with rod (3).
2. Remove pin (4) in the mount at the rear of the cab, and insert
it in hole (6).
3. Remove the cab mounting bolts (8 pieces).
4. Apply hydraulic pressure (20.6 to 34.3 MPa (210 to 350 kg/cm
2
, 2980 to 4970 PSI) to hose (7) behind the front right wheel and
raise the cab.
5. After tilting up, fixed the cab in position with lock bar (8).
6. Make sure that lock bar (8) is installed in the correct direction
and lock it securely with lock (9).
7. After returning the cab to its original position, insert pin (4) in
hole (5).
3 - 109
.
OPERATION
OPERATION
PRECAUTIONS FOR OPERATION
When traveling on roads in rain or snow, or when traveling on muddy or soft ground, consider the loaded condition
of the machine and be extremely careful not to let the tires slip or the machine spin and sink into the ground.
If the engine should stop when the machine is traveling, stop the machine immediately, then move the gear shift
lever to the N position, and start the engine again.
If the central warning lamp and pilot lamp for any EMERGENCY item on the machine monitor should flash and
the buzzer sounds during operation, stop the machine immediately and investigate the cause.
For details, see "TROUBLESHOOTING (PAGE 3-125)".
When loading, be careful to load the dump body uniformly, and be particularly careful to avoid loading too much
at the front.
On slippery road surfaces, apply the retarder control lever slowly and shift the transmission down to prevent the
wheels from locking.
PERMISSIBLE WATER DEPTH
Do not travel in swampy ground or water deeper than the
permissible water depth (bottom of differential case (1)). After
finishing work, wash the machine and supply grease to the parts
which have been soaked in water.
If the machine travels in water or swampy ground, water may enter
the drain tank. Referring to "RECOVER OIL LEAKING FROM
FLOATING SEAL (PAGE 4-58)", draw up the water with the
attached hand pump.
3 - 110
.
OPERATION
OPERATION
PARKING MACHINE
WARNING
Avoid stopping suddenly. Give yourself ample room when stopping.
Park the machine on firm, horizontal ground.
Do not park the machine on a slope.
If it is unavoidably necessary to park the machine on a slope, put blocks
under the tires to prevent the machine from moving.
If the shift lever is touched by mistake, the machine may move
suddenly, and this may lead to a serious injury or death. Before
standing up from the operator's seat, always set the parking brake
switch securely to the PARKING position.
The retarder must not be used as a parking brake.
Do not use the retarder for long-term parking, regardless of the engine
speed.
CAUTION
To prevent damage to the parking brake, apply the parking brake only when
parking the machine or carrying out dumping operations.
1. Release accelerator pedal (1), then depress brake pedal (2) to
stop the machine.
2. Move shift lever (3) to the N position, then set parking brake
switch (4) to the PARKING position to apply the parking brake.
3 - 111
.
OPERATION
OPERATION
3. When in the operator's compartment, pull retarder control lever
(5) fully to apply the retarder.
NOTICE
The retarder must not be used as a parking brake.
Do not use the retarder for long-term parking, regardless of the engine
speed.
CHECKS AFTER COMPLETION OF WORK
Use the machine monitor to check the engine water temperature, engine oil pressure, and fuel level. If the engine
has overheated, do not stop the engine suddenly. Run it at a mid-range speed to cool it gradually before stopping.
LOCKING
Always lock the following places.
(1) Fuel filler cap of fuel tank
(2) Cab door (left, right)
(3) Engine hood
(4) Tool box
(5) Battery box
REMARK
The starting switch key is used for locking places (1), (2), (3), (4)
and (5).
3 - 112
.
OPERATION
OPERATION
HANDLING TIRES
PRECAUTIONS WHEN HANDLING TIRES
WARNING
To ensure safety, the defective tires given below must be replaced with
new tires.
Tires where the bead wire has been cut, broken, or greatly deformed
Excessively worn tires where more than 1/4 of the circumference of the
carcass ply (excluding the breaker) is exposed
Tires where damage to the carcass exceeds 1/3 of the tire width
Tires where ply separation has occurred
Tires where radial cracks extend to the carcass
Tires where there is abnormal deterioration, deformation, and damage,
and the tire cannot withstand use.
Please contact your Komatsu distributor when replacing the tires.
It is dangerous to jack up the machine without taking due care.
PRECAUTIONS FOR LONG DISTANCE TRAVEL
If the machine travels continuously at high speed for a long distance, there will be a marked increase in the
generation of heat in the tire. This may cause premature damage to the tire, so be careful of the following points.
Travel only when empty.
Check the tire inflation pressure before starting for the day when the tires are cold, and adjust to the following
inflation pressure.
Do not reduce the tire inflation pressure when traveling.
Tire size
Inflation pressure [MPa (kg/cm2, PSI)]
Front
Center
Rear
23.5-R25 (standard)
0.44 (4.5, 63.9)
0.44 (4.5, 63.9)
0.44 (4.5, 63.9)
750/65 R25 (30/65 R25) (if equipped)
0.34 (3.5, 49.7)
0.40 (4.1, 58.2)
0.40 (4.1, 58.2)
NOTICE
If the tires are used when the inflation pressure is less than the value given in the table above, the rim may be damaged.
Always keep the tire inflation pressure within +0 to +0.03 MPa (0.3 kg/cm2, 4.3 PSI) of the value in the table above.
The maximum travel speed must be kept to less than 40 km/h (24.9 MPH). Stop for at least one hour for every
one hour of travel to allow the tires and other components to cool down.
Never travel with water or dry ballast in the tires.
3 - 113
.
DETERMINING AND MAINTAINING TRAVEL ROAD
OPERATION
DETERMINING AND MAINTAINING TRAVEL ROAD
Determining and traveling the road in the jobsite is an extremely important factor both for reasons of safety and for
reducing the cycle time.To ensure safety in operations, do as follows.
DETERMINING TRAVEL ROAD
As far as possible, restrict the travel road to one-way travel.
If it is impossible to keep to one-way traffic, make the road with ample width to enable trucks traveling in opposite
directions to pass each other. If it is impossible to provide a sufficient road width, provide passing places at
various points along the road.
Always design the road so that the loaded truck passes on the side closest to the hill face.
If there are curves with poor visibility along the road, set up mirrors.
In places where the road should is weak or likely to collapse, set up a sign at a point at least 1.5 m (4 ft 11 in) from
the road shoulder to warn of the danger.
It is important to set up lighting or reflectors to enable the road to be traveled at night.
The grade of slope should be kept within 10% (approx. 6°) as far as possible, and emergency escape points
should be set up on downhill slopes in case of any brake failure.
Make the road as straight as possible, and particularly in intermediate areas with curves, where the machine is
traveling at high speed, make the radius of the curve as large as possible.
Small S curves are particularly dangerous, so avoid such curves. The radius of the curve must be a minimum of
12 to 15 m (39 ft 4 in to 49 ft 3 in).
Make the radius of curves as large as possible.
Make the road wider at curves than it is in straight areas.
Make the outside of the curve slightly higher.
Be particularly careful to strengthen the road shoulder on the outside of curve.
As far as possible, design the road so that no other roads cross it. In particular, if roads cross at an angle on
slopes, a stepped difference is formed in the road. This is extremely dangerous, as it causes the machine to roll
when traveling at high speed.
Cut the slope face to provide a special road for the trucks.
MAINTAINING TRAVEL ROAD
Carry out the necessary action according to the conditions to insure that the road can always be traveled in safety.
Remove any unevenness in the travel surface, sloping to the left or right, or drooping of the road shoulder. Make
the road of ample strength and remove such obstacles as rocks and tree stumps.
Maintain the road from time to time with a bulldozer or motor grader.
Spray the road with water at suitable intervals to prevent dust from rising and reducing the visibility.
3 - 114
.
OPERATION
TRANSPORTATION
TRANSPORTATION
PRECAUTIONS WHEN TRANSPORTING
Always obey the traffic regulations when transporting the machine by road.
WARNING
This machine must be disassembled for transportation. When transporting the machine, please consult your Komatsu
distributor.
STEPS FOR TRANSPORTATION
As a basic rule, always transport the machine on a trailer.
When selecting the trailer, see the weights and dimensions given in "SPECIFICATIONS (PAGE 5-2)".
Note that the specifications for the weights and dimensions for transportation differ according to the type of tires and
type of dump body.
3 - 115
.
TRANSPORTATION
METHOD OF SECURING MACHINE
After loading the machine in the specified position, secure it in place as follows.
1. Set the parking brake switch to the PARKING position to apply
the parking brake.
2. Turn the key in the starting switch to the OFF position to stop
the engine.
3. Remove the key from the starting switch.
4. Lock the front frame and rear frame with the articulation lock.
5. Put blocks in front of and behind the wheels and secure the
machine with chains or wire rope of a suitable strength to
prevent the machine from moving during transportation.
NOTICE
Always retract the antenna and reassemble the mirrors so that they are
within the width of the machine.
3 - 116
OPERATION
.
OPERATION
TRANSPORTATION
METHOD OF LIFTING MACHINE
When lifting the machine at a port or any other place, always use the following procedure to lift it.
WARNING
The operator carrying out the lifting operation using a crane must be a properly qualified crane operator.
Never raise the machine with any worker on it.
Always make sure that the wire rope is of ample strength for the weight of this machine.
When lifting, keep the machine horizontal.
Before starting the lifting operation, always stop the engine, apply the parking brake, and use the articulation lock to prevent
the front frame from articulating.
Never enter the area around or under the machine when it is raised.
Never try to lift the machine in any posture other than the posture given in the procedure below or using lifting
equipment other than in the procedure below.
There is a hazard that the machine may lose its balance.
NOTICE
This method of lifting applies to the standard specification machine.
The method of lifting differs according to the attachments and options installed.
For details of the procedure for machines that are not the standard specification, please consult your Komatsu distributor.
For the weight of the standard specification machine, see "WEIGHT TABLE (PAGE 3-118)".
NOTICE
Use protectors to prevent the wire rope from being cut on sharp corners and to prevent the wire rope from cutting into the
machine bodywork.
When using a spreader bar, select an ample width to prevent contact with the machine.
Please consult your Komatsu distributor before carrying out lifting work.
3 - 117
.
OPERATION
TRANSPORTATION
LOCATION OF LIFTING POSITION MARK
WEIGHT TABLE
Machine
weight
HM300-2
3 - 118
24040 kg
(53008 lb)
Front wheel Center wheel
load
load
13410 kg
(29569 lb)
5670 kg
(12502 lb)
Rear wheel
load
Center of gravity
(from front axle)
4960 kg
(10937 lb)
2165 mm
(7 ft 1 in)
.
OPERATION
TRANSPORTATION
LIFTING PROCEDURE
Lifting work can be carried out only with machines displaying a lifting mark.
When carrying out the lifting operation, stop the machine on firm level ground, and do as follows.
1. Start the engine, set the machine facing directly to the front,
place the dump lever at the FLOAT position, and check that the
dump body pilot lamp goes out.
2. Stop the engine, apply the brake, check that the area around
the operator's compartment is safe, then lock with the
articulation lock to prevent the front frame and rear frame from
articulating.
3. To prevent damage to front grill (1) during lifting operations,
remove front grill (1) before starting.
3 - 119
.
TRANSPORTATION
4. Select wire ropes, slings, spreader bars and other lifting
equipment to match the weight of the machine, and fit the wire
ropes to the lifting hooks at the front of the front frame and the
rear of the rear frame (lifting hook marks).
5. Fit protector blocks at contact points (2) between the lifting
equipment and the body to prevent damage to the lifting
equipment.
6. When the machine comes off the ground (raised 10 to 20
cm(3.9 to 7.9 in)), stop the lifting operation, check carefully that
the machine is balanced and that the wire ropes are not loose,
then continue the lifting operation slowly.
3 - 120
OPERATION
.
OPERATION
COLD WEATHER OPERATION
COLD WEATHER OPERATION
PRECAUTIONS FOR LOW TEMPERATURE
If the temperature becomes low, it becomes difficult to start the engine, and the coolant may freeze, so do as follows.
FUEL AND LUBRICANTS
Change to fuel and oil with low viscosity for all components. For details of the specified visicosity, see
"RECOMMENDED FUEL, COOLANT, AND LUBRICANT (PAGE 4-10)".
COOLANT
WARNING
Antifreeze is toxic. Be careful not to get it into your eyes or on your skin. If it should get into your eyes or on your skin, wash
it off with large amounts of fresh water and see a doctor at once.
When changing the coolant or when handling coolant containing antifreeze that has been drained when repairing the radiator,
please contact your Komatsu distributor or request a specialist company to carry out the operation. Antifreeze is toxic. Do not
let it flow into drainage ditches or spray it onto the ground surface.
Antifreeze is flammable. Do not bring any flame close. Do not smoke when handling antifreeze.
NOTICE
Use Komatsu Supercoolant (AF-NAC) wherever available, or use permanent type antifreeze coolant.
Never use methanol, ethanol, or propanol-based antifreeze.
Do not use any water leakage prevention agent, either alone, or in combination with antifreeze.
Do not mix one brand of antifreeze with a different brand.
When using Komatsu Supercoolant (AF-NAC), there is no need to use a corrosion resistor. For details, see "CLEAN INSIDE OF
COOLING SYSTEM (PAGE 4-26)".
For details on the amount of antifreeze mixture and on when to change the coolant, see "CLEAN INSIDE OF
COOLING SYSTEM (PAGE 4-26)".
3 - 121
.
OPERATION
COLD WEATHER OPERATION
BATTERY
WARNING
The battery generates flammable gas. Do not bring fire or sparks near the battery.
Battery electrolyte is dangerous. If it gets in your eyes or on your skin, wash it off with a large amount of water and consult a
doctor.
Battery electrolyte dissolves paint. If it gets on the bodywork, wash it off immediately with water.
If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power source. There is danger
that the battery may explode.
Battery electrolyte is toxic. Do not let it flow into drainage ditches or spray it on to the ground surface.
When the ambient temperature drops, the capacity of the battery will also drop. If the battery charge ratio is low, the
battery electrolyte may freeze. Maintain the battery charge as close as possible to 100%. Insulate it against cold
temperature to ensure the machine can be started easily the next morning.
Measure the specific gravity and calculate the rate of charge from the following conversion table.
Charging
Rate (%)
Electrolyte
Temperature
(°C)
20
0
-10
-20
100
1.28
1.29
1.30
1.31
90
1.26
1.27
1.28
1.29
80
1.24
1.25
1.26
1.27
75
1.23
1.24
1.25
1.26
When adding distilled water in cold weather, add it before starting operations in the morning to prevent the
electrolyte from freezing.
INSTALLATION OF RADIATOR CURTAIN
(If equipped)
If the display for the engine water temperature gauge does not enter the white range, install a radiator curtain.
It is possible to adjust the degree of opening of the radiator curtain (fully closed, one side open, and both sides open).
Adjust to a suitable condition to match the ambient temperature so that the engine water temperature gauge display
enters the white range.
PRECAUTIONS AFTER COMPLETION OF WORK
To prevent mud, water, or the undercarriage from freezing and making it impossible for the machine to move on the
following morning, observe the following precautions.
Mud and water on the machine body should be completely removed. This is to prevent damage to the seal caused
by water in mud or dirt getting inside the seal and freezing.
Park the machine on hard, dry ground.
If this is impossible, park the machine on wooden boards.
The boards help protect the tracks from being frozen in soil and the machine can start next morning.
Open the drain valve and drain any water collected in the fuel system to prevent it from freezing.
As the battery capacity drops markedly in low temperatures, cover the battery or remove it from the machine,
keep it in a warm place, and install it again the next morning.
If the electrolyte level is low, add distilled water in the morning before beginning work. Do not add water after the
day's work to prevent diluted electrolyte in the battery from freezing during the night.
3 - 122
.
OPERATION
COLD WEATHER OPERATION
AFTER COLD WEATHER
When the season changes and the weather becomes warmer, do as follows.
Replace the fuel and oil for all parts with oil of the viscosity specified.
For details, see "RECOMMENDED FUEL, COOLANT, AND LUBRICANT (PAGE 4-10)".
3 - 123
.
OPERATION
LONG-TERM STORAGE
LONG-TERM STORAGE
BEFORE STORAGE
When keeping in long-term storage (more than one month), store as follows.
After every part is washed and dried, house the machine in a dry building. Never leave it outdoors.
In case it is indispensable to leave it outdoors, park the machine on the flat ground and cover it with canvas etc.
Completely fill the fuel tank. This prevents moisture from collecting.
Lubricate and change the oil before storage.
Coat the exposed portion of the hydraulic cylinder piston rod with grease.
Disconnect the negative terminals of the battery and cover it or remove it from the machine and store it separately.
Apply the parking brake.
Set the tire inflation pressure for each tire to within the range of the specified inflation pressure for the type of tire.
Push the retarder control lever forward to the OFF position.
Place the gear shift lever at the N position and turn the starting switch OFF.
To prevent corrosion, be sure to fill the cooling system with Supercoolant (AF-NAC) or permanent type antifreeze
(density between 30% and 68%).
DURING STORAGE
WARNING
If it is necessary to perform the rust-prevention operation while the machine is indoors, open the doors and windows to improve
ventilation and prevent gas poisoning.
During the storage period, operate the machine once a month to prevent loss of the oil film at the lubricated parts.
At the same time, charge the battery.
Before operating the work equipment, wipe off all the grease from hydraulic piston rods.
AFTER STORAGE
NOTICE
If the machine has been stored without carrying out the monthly rust-prevention operation, consult your Komatsu distributor
before using it.
When using the machine after long-term storage, do as follows before using it.
Wipe off the grease from the hydraulic cylinder rods.
Add oil and grease at all lubrication points.
When the machine is stored for a long period, moisture in the air will mix with the oil. Check the oil before and after
starting the engine. If there is water in the oil, change all the oil.
PRECAUTIONS BEFORE TRAVELING AFTER LONG-TERM STORAGE
1. Check all the oil and water levels before traveling.
2. When traveling after long-term storage, travel forward at a speed of 10 to 15 km/h (6.2 to 9.3 MPH) for 5 minutes
or 1 km to run the machine in, then change to normal travel.
3 - 124
.
OPERATION
TROUBLESHOOTING
TROUBLESHOOTING
AFTER RUNNING OUT OF FUEL
If you have run out of fuel, add fuel to the fuel tank and bleed air from the fuel system and then start the engine.
PROCEDURE FOR BLEEDING AIR
CAUTION
The fuel injection pump and nozzle of this engine consist of more precise parts than the conventional ones. If foreign matter
enters them, it can cause a trouble. Accordingly, if dust sticks to the fuel system, wash it off with clean fuel.
When opening the air bleeding plug at the fuel filter head, take care. Fuel may spout because of residual pressure.
1. Fill the fuel tank with fuel.
2. Loosen air bleeding plug (1) at the fuel main filter head.
Do not loosen the plug at the filter stand of the fuel prefilter. If
it is loosened, air is not bled.
3. Loosen wing bolt (3) which is fixing lever (4) of priming pump
(2). Move lever (4) up and down to let fuel flow out of air
bleeding plug (1) until bubbles do not come out any more.
4. Tighten air bleeding plug (1) and then tighten wing bolt (3) of
priming pump (2) securely to lock lever (4).
Tightening torque for air bleeding plug
7.8 to 9.8Nm{0.8 to 1kgm}
Tightening torque for wing screw
6.9 to 12.7Nm{0.7 to 1.3kgm}
5. Turn the key in the starting switch to the START position and
start the engine.
When doing this, do not crank the starting motor continuously
for more than 20 seconds. If the engine does not start, wait for
at least 2 minutes, then try again. Perform this operation a
maximum of 4 times.
6. If the engine does not start, repeat the procedure from Step 2.
3 - 125
.
TROUBLESHOOTING
OPERATION
IF TRANSMISSION HAS TROUBLE
If the transmission has any trouble, operate the machine according
to the following procedure.
1. Decelerate the machine with the brake and stop it on a safe
place.
2. Set the shift lever to the N position, then set the parking brake
switch to the PARKING position.
3. In some trouble modes, the gear is not shifted even if the shift
lever is operated.
In this case, perform the following procedure.
1) Disconnect emergency escape connectors (1) (No. A-1, A-2, 1-pole White connector) and connect them
again.
2) Set the parking brake switch to the TRAVEL position.
3) Operate the shift lever to move the machine to a safe place without depressing the accelerator pedal.
If the gear shift lever is operated with the accelerator pedal depressed, the emergency escape function will not work.
In addition, the emergency escape function may not work for some failure codes.
While the emergency escape function is working, the shift indicator of the machine monitor displays "E" and the shift
range (gear speed) of the transmission alternately.
METHOD OF LOWERING DUMP BODY IN EMERGENCY
When the dump body needs to be lowered to the seat while the
engine cannot be started for some trouble, perform the following
procedure.
1. Remove cover (2) from the rear of hydraulic tank (1).
2. Loosen locknut (4) of manual lower valve (3).
3. Turn grip (5) of valve (3) counterclockwise.
The oil in the hoist cylinder is drained into the hydraulic tank
and the dump body lowers.
4. Tighten grip (5) and locknut (4) and install cover (2).
If the dump body does not go down even when the above
method is used, please consult your Komatsu distributor.
3 - 126
.
OPERATION
TROUBLESHOOTING
METHOD OF TOWING MACHINE
WARNING
Injury or death could result if a disabled machine is towed incorrectly or if
there is a mistake in the selection of the wire rope or drawbar.
Always confirm that the wire rope or drawbar used for towing has ample
strength for the weight of the machine being towed.
Never use a wire rope which has cut strands (A), reduced diameter (B),
or kinks (C). There is danger that the rope may break during the towing
operation.
Always wear leather gloves when handling wire rope.
Never tow a machine on a slope.
Never go between the towing machine and the towed machine during
the towing operation.
If the machine moves suddenly, a load is applied suddenly to the towing
wire or drawbar, and the towing wire or drawbar may break. Move the
machine gradually to a constant speed.
Be extremely careful if there is a failure in the engine or brake system:
the brakes will not work.
If the steering and the brakes on the disabled machine cannot be
operated, do not let anyone ride on the disabled machine.
NOTICE
The permissible towing capacity for this machine is 176800N (18030 kg). Do not tow any load greater than this.
Towing is only permitted in order to move a disabled machine to a place where it is possible to carry out inspection and
maintenance. It must not be towed for long distances.
Please consult your Komatsu distributor for information about towing a disabled machine.
3 - 127
.
TROUBLESHOOTING
OPERATION
This machine must not be towed except in emergencies. When towing the machine, take the following precautions.
When towing a machine, tow it at a low speed of less than 2 km/h (1.2 MPH), and for a distance of a few meters
to a place where repairs can be carried out. The machine should be towed only in emergencies. If the machine
must be moved long distances, use a transporter.
Use a towing machine of the same class as the machine being towed.
Check that the towing machine has ample braking power, weight, and rimpull to allow it to control both machines
on slopes or on the tow road.
When towing, set the articulate lock of the towed machine to the LOCK position. However, when towing in places
where it is needed to steer, set the articulate lock to the FREE position. Use two towing machines of the same
class or larger than the machine being towed: connect one machine each to the front and rear of the machine
being towed.
Use the specified hook for both the towing machine and the machine being towed.
To protect the operator if the towing wire or towing bar breaks, install protective plates on both the towing machine
and the machine being towed.
There are towing hooks under the front frame and at the rear of the rear frame. Use only these hooks when
towing. Do not use any other place for towing.
When fitting the towing wire, check the condition of the hook to make sure that there is no problem.
Keep the angle of the towing wire as small as possible.
Keep the angle between the center lines of the two machines to within 30 degrees.
Towing may be carried out under various differing conditions, so it is impossible to determine beforehand the
requirements for towing.
Towing on flat horizontal roads will require the minimum rimpull, while towing on slopes or on uneven road
surfaces will require the maximum rimpull.
If the pressure in a hydraulic circuit has dropped because of leakage of oil, the parking brake will be applied, so
release the parking brake before towing.
Before releasing the parking brake, always put blocks under all
four wheels. If the wheels are not blocked, there is danger that
the machine may move.
Connect with the towing wire or drawbar, and remove the blocks
from the wheels when the disabled machine is in a condition
where it cannot run away.
When carrying out the operation to release the parking brake,
check that the surrounding area is safe.
If the parking brake is released, the brakes will not work, so pay
careful attention to safety.
When towing down a slope, use two towing machines. One
machine should be uphill from the disabled machine and should
be connected with towing wire or a drawbar to pull the disabled
machine back and keep it stable. The other machine should tow
the disabled machine downhill.
3 - 128
.
OPERATION
TROUBLESHOOTING
WHEN ENGINE RUNS
If the transmission and steering wheel can be operated, and the engine is running, it is possible to tow the
machine out of mud or to move it for a short distance to the edge of the road.
Check the effect of the brakes, and if the brakes do not work properly, take the action given in "When engine does
not run".
Check if it is possible to steer the machine. If the machine cannot be steered, follow the procedure given in
"WHEN ENGINE DOES NOT RUN".
The operator should sit on the machine being towed and operate the steering in the direction that the machine
is towed.
Always run the engine to allow the steering and brakes to be used.
WHEN ENGINE DOES NOT RUN
The brakes will not work, so be extremely careful.
Connect the towing machine securely to the towed machine. Use two towing machines of the same class or
larger than the machine being towed: connect one machine each to the front and rear of the machine being towed.
If it is necessary to change the direction of the machine being towed, it is possible to use the emergency steering,
but it can be used for a maximum of only 90 seconds.
If the emergency steering cannot be used, disconnect two hydraulic hoses each on the left and right from the
steering cylinders, then carry out the towing operation. When removing the hoses, block the hoses with plugs and
fit oil containers to the mouthpiece of the cylinder to prevent oil from draining to the ground.
3 - 129
.
OPERATION
TROUBLESHOOTING
WHEN PARKING BRAKE HAS BEEN ACTUATED IN EMERGENCY
If the pressure in the hydraulic circuit goes down abnormally because of oil leakage or some other cause, the parking
brake is automatically applied.
It is necessary to tow or move the machine, the parking brake must be released. Release the parking brake as
follows.
METHOD OF RELEASING PARKING BRAKE
Please ask your Komatsu distributor to release the parking brake.
WARNING
If any abnormality occurs in the hydraulic circuit, there is danger that the wheel brakes may not be applied properly, so always
travel at low speed when towing the machine.
When carrying out the operation to release the parking brake, check that the surrounding area is safe, and always put blocks
under all four wheels before starting the operation. If the wheels are not blocked, there is danger that the machine may
suddenly move.
Always stop the engine before starting the operation to release the parking brake.
1. Stop the engine.
2. Put blocks under the wheels.
3. Turn parking brake adjustment screw (1) counterclockwise.
4. Check that there is a clearance between the parking brake pad
and disc brake.
5. When the parking brake is released, tow the machine
immediately to a safe position.
For details of the method of towing, see "METHOD OF
TOWING MACHINE (PAGE 3-127)".
3 - 130
.
OPERATION
TROUBLESHOOTING
IF BATTERY IS DISCHARGED
WARNING
It is dangerous to charge a battery when mounted on a machine. Make sure that it is dismounted before charging.
When checking or handling the battery, stop the engine and turn the starting switch key to the OFF position.
The battery generates hydrogen gas, so there is a hazard of explosion. Do not bring lighted cigarettes near the battery, or do
anything that will cause sparks.
Battery electrolyte is dilute sulfuric acid, and it will attack your clothes and skin. If it gets on your clothes or on your skin,
immediately wash it off with a large amount of water. If it gets in your eyes, wash it out with fresh water and consult a doctor.
When handling batteries, always wear safety glasses and rubber gloves.
When removing the battery, first disconnect the cable from the ground (normally the negative (-) terminal). When installing,
install the positive (+) terminal first.
If a tool touches the positive terminal and the chassis, there is danger that it will cause a spark, so be extremely careful.
If the terminals are loose, there is danger that the defective contact may generate sparks that will cause an explosion.
When removing or installing the terminals, check which is the positive (+) terminal and which is the negative (-) terminal.
REMOVAL AND INSTALLATION OF BATTERY
Before removing the battery, remove the ground cable (normally
connected to the negative (-) terminal).
If any tool touches between the positive terminal and the
chassis, there is a hazard of sparks being generated.
When installing the battery, connect the ground cable last.
3 - 131
.
TROUBLESHOOTING
OPERATION
PRECAUTIONS FOR CHARGING BATTERY
CHARGING BATTERY WHEN MOUNTED ON MACHINE
When the charging the battery, if the battery is mistakenly handled,
there is danger of explosion. Follow the precautions in "IF
BATTERY IS DISCHARGED (PAGE 3-131)" and the instructions
given in the charger manual, and always do as follows.
Set the voltage of the charger to match the voltage of the battery
to be charged. If the correct voltage is not selected, the charger
may overheat and cause an explosion.
Connect the positive (+) charger clip of the charger to the
positive (+) terminal of the battery, then connect the negative (-)
charger clip of the charger to the negative (-) terminal of the
battery. Be sure to attach the clips securely.
Set the charging current to 1/10 of the value of the rated battery capacity; when carrying out rapid charging, set
it to less than the rated battery capacity.
If the charger current is too high, the electrolyte will leak or dry up, and this may cause the battery to catch fire and
explode.
If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power source.
There is a danger that this will ignite the battery electrolyte and cause the battery to explode.
Do not use or charge the battery if the battery electrolyte level is below the LOWER LEVEL line. This may cause
an explosion. Check the battery electrolyte level periodically and add distilled water to bring the electrolyte level
to the UPPER LEVEL line.
3 - 132
.
OPERATION
TROUBLESHOOTING
STARTING ENGINE WITH BOOSTER CABLE
When starting the engine with a booster cable, do as follows.
PRECAUTIONS WHEN CONNECTING AND DISCONNECTING BOOSTER CABLE
WARNING
When connecting the cables, never contact the positive (+) and negative
(-) terminals.
When starting the engine with a booster cable, wear safety glasses and
rubber gloves.
Be careful not to let the normal machine and problem machine contact
each other. This prevents sparks from generating near the battery which
could ignite the hydrogen gas given off by the battery.
Make sure that there is no mistake in the booster cable connections.
The final connection is to the engine block of the problem machine, but
sparks will be generated when this is done, so connect to a place as far
as possible from the battery.
When disconnecting the booster cable, take care not to bring the clips
in contact with each other or with the machine body.
NOTICE
The size of the booster cable and clip should be suitable for the battery size.
The battery of the normal machine must be the same capacity as that of the problem machine.
Check the cables and clips for damage or corrosion.
Make sure that the cables and clips are firmly connected.
CONNECTING THE BOOSTER CABLES
Keep the starting switch of the normal machine and problem machine in the OFF position.
Connect the booster cable as follows, in the order of the numbers marked in the diagram.
1. Connect one clip of booster cable (A) to the positive (+)
terminal of the problem machine.
2. Connect the other clip of booster cable (A) to the positive (+)
terminal of the normal machine.
3. Connect one clip of booster cable (B) to the negative (-)
terminal of the normal machine.
4. Connect the other clip of booster cable (B) to the engine block
of the problem machine.
3 - 133
.
OPERATION
TROUBLESHOOTING
STARTING THE ENGINE
CAUTION
Make sure that the parking brake switch is at PARKING position and the shift lever is at N (neutral) position for both normal
machine and the problem machine.
1. Make sure the clips are firmly connected to the battery terminals.
2. Start engine of the normal machine and run it at high idle speed.
3. Turn the starting switch of the problem machine to the START position and start the engine.
If the engine doesn't start at first, try again after 2 minutes or so.
DISCONNECTING THE BOOSTER CABLES
After the engine has started, disconnect the booster cables in the reverse of the order in which they were connected.
1. Remove one clip of booster cable (B) from the engine block of
the problem machine.
2. Remove the other clip of booster cable (B) from the negative (-)
terminal of the normal machine.
3. Remove one clip of booster cable (A) from the positive (+)
terminal of the normal machine.
4. Remove the other clip of booster cable (A) from the positive (+)
terminal of the problem machine.
3 - 134
.
OPERATION
TROUBLESHOOTING
OTHER TROUBLE
ELECTRICAL SYSTEM
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem
Lamp does not glow brightly even
when engine runs at high speed
Lamp flickers while engine is
running
Main causes
Defective wiring
Insufficient battery charge
Defective adjustment of belt
tension
Remedy
( Check, repair loose terminals,
disconnections)
Charge, Add distilled water
Adjust alternator belt tension
See EVERY 250 HOURS
SERVICE
Battery charge system caution pilot
lamp lights up while engine is
running
Defective alternator
Defective wiring
( Replace)
( Check, repair)
Abnormal noise is generated from
alternator
Defective alternator
( Replace)
Starting motor does not turn when
starting switch is turned to ON
Defective wiring
Defective starting switch
Insufficient battery charge
Defective battery switch
( Check, repair)
( Replace switch)
Charge
( Replace switch)
Starting motor turns engine
sluggishly
Defective wiring
Insufficient battery charge
( Check, repair)
Charge
Starting motor disengages before
engine starts
Defective wiring
Insufficient battery charge
( Check, repair)
Charge
3 - 135
.
OPERATION
TROUBLESHOOTING
CHASSIS
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem
Main causes
Remedy
Torque converter oil temperature
caution lamp flashes
Leakage of oil or entry of air due ( Check, repair)
to damage or defective tightening
of oil pipe, pipe joint
Wear, scuffing of gear pump
( Check, repair)
Insufficient oil in transmission
Add oil to specified level. See
case
CHECK BEFORE STARTING
Loose fan belt
Replace belt. See EVERY 250
HOURS SERVICE
( Clean or replace)
Clogged oil cooler
Long distance traveled in torque
Drive in direct range
converter range
( Repair, connect wiring)
Disconnected, broken wiring to
sensor
Steering wheel is heavy
Lack of grease at link
Internal leakage inside steering
cylinder
Steering wheel pulls
Tire inflation pressure not uniform
on left and right
Dragging, pulling of front brake
Braking effect is poor when brake
pedal is depressed
Brake pulls to one side
Disc has reached wear limit
Rear disc has reached wear limit
Insufficient oil pressure
Insufficient brake oil
Air in brake circuit
Add grease
( Replace cylinder seal)
Make tire inflation pressure
uniform. See CHECK BEFORE
STARTING
Check wear of brake disc
For details, see EVERY 1000
HOURS SERVICE
( Replace disc)
( Replace disc)
Charge to specified pressure
Add oil to the transmission case
See CHECK BEFORE
STARTING
Bleed air
See WHEN REQUIRED
Dump body speed is slow
Defective gear pump
Insufficient oil
Suspension is hard
Entry of soil or sand due to break- ( Replace U-packing)
age of dust seal, gas leakage
due to breakage of U-packing
Gas leaking from valve core
( Replace valve core)
Wheel on one side tends to slip
Air in brake circuit (between
slack adjuster and brake)
Excessive difference in wear
between left and right tires
Excessive difference in division
of load between left and right
wheels (unbalanced load)
Excessive deformation of disc
3 - 136
( Replace gear pump)
Add oil to specified level. See
CHECK BEFORE STARTING
Bleed air from brakes (left,
right). See WHEN REQUIRED.
( Replace tires)
Make load uniform
( Disassemble and adjust brake)
.
OPERATION
TROUBLESHOOTING
IF ACCELERATOR PEDAL HAS FAILED
In addition to the potentiometer detecting the pedal depression depth, the switch (check switch) is installed on the
accelerator pedal assembly in order to detect whether the accelerator pedal is depressed or not.
If the pedal depression depth is not detected correctly due to a failure of the accelerator pedal or incorrect electric
wiring, the engine controller controls the engine speed responding to the signal from this check switch. The engine
runs at 1500 rpm when the accelerator pedal is depressed, while the engine runs at low idle when the pedal is
released. The engine speed varies depending on the load.
After using the accelerator pedal to move the machine to a safe place, check the service code and contact your
Komatsu distributor.
There are two methods when operating the accelerator pedal: either release the pedal (check switch is OFF, low
idle), or depress the pedal fully (1500 rpm).
If the accelerator pedal is held at an intermediate position, the system may not be able to judge if the accelerator
pedal is being operated or not.
REMARK
If the engine controller cannot perform normal reception of the signal of the accelerator pedal depth, the central
warning lamp flashes and simultaneously the alarm buzzer sounds and user code 02 appears.
3 - 137
.
OPERATION
TROUBLESHOOTING
ENGINE
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem
Engine oil pressure monitor lights
up
Main causes
Insufficient oil in oil pan
Clogged oil filter cartridge
Oil leakage due to damage
caused by defective tightening of
oil pan, pipe joint
Disconnection, broken wiring to
sensor
Steam spurts out from top of
radiator (pressure valve)
Remedy
Add oil to specified level. See
CHECK BEFORE STARTING
Replace cartridge, see EVERY
500 HOURS SERVICE
( Check, repair)
( Repair, connect wiring)
Insufficient coolant, water leakage
Loose fan belt
Radiator cooling water level
monitor lights up
Dirt or scale accumulated in
cooling system
Radiator fins clogged or damaged
Engine water temperature gauge is
in red range
Engine water temperature monitor
flashes
Defective water temperature
gauge
Defective thermostat
Defective thermostat seal
Loose radiator filler cap
Disconnection, broken wiring to
sensor
(
(
(
(
Check, add cooling water. See
CHECK BEFORE STARTING
Replace belt. See EVERY 250
HOURS SERVICE
Change coolant, clean inside of
cooling system. See WHEN
REQUIRED
Clean or repair. See EVERY 500
HOURS SERVICE
Replace water temperature
gauge)
Replace thermostat)
Replace thermostat seal)
Tighten or replace cap
Repair, connect wiring)
Engine water temperature gauge
display stays at lowest level and
does not rise
Defective water temperature
gauge monitor
Defective thermostat
In cold weather, cold wind is
blowing strongly against engine
( Replace water temperature
gauge monitor)
( Replace thermostat)
( Install radiator curtain)
Engine does not start even when
starting motor is turned
Insufficient fuel
Add fuel. See CHECK BEFORE
STARTING
( Repair place where air is leaking
in)
Fill filter with fuel. See EVERY
500 HOURS SERVICE
See electrical components
Air in fuel system
No fuel in fuel filter
Starting motor cranks engine too
slowly
Starting motor does not turn
Defective valve clearance
(defective compression)
Fuel stops from time to time
3 - 138
Crushed fuel tank breather tube
See electrical components
( Adjust valve clearance)
( Replace breather tube)
.
OPERATION
TROUBLESHOOTING
Problem
Main causes
Excessive oil consumption
Oil leakage
Excessive oil in oil pan
Exhaust gas is white or bluish
Worn piston, ring, cylinder liner
Improper fuel
Defective turbocharger
Exhaust gas is black
Clogged air cleaner element
Remedy
( Check, repair)
Add oil to specified level. See
CHECK BEFORE STARTING
( Replace)
Replace with specified fuel
( Check, replace)
Clean or replace. See WHEN
REQUIRED
Check, repair)
See adjustment of clearance
above
Check, replace)
Check, replace, repair)
Check, adjust, repair)
Worn piston, ring, cylinder liner
Defective compression
(
Defective turbocharger
Defective exchaust brake
Defective injector
(
(
(
Engine hunts
Air entering suction side of fuel
line
( Repair place where air is leaking
in)
Combustion noise occasionally
makes breathing sound
Defective nozzle
( Replace nozzle)
There is knocking (combustion or
mechanical)
Poor quality fuel being used
Overheating
Replace with specified fuel
See "Engine water temperature
gauge is in red range" above
3 - 139
.
TROUBLESHOOTING
OPERATION
ACTION CODE
If any problem occurs, stop the machine, apply the parking brake and check the service code, then contact your
Komatsu distributor for repairs.
If action code "E03" is displayed on the character display (1), or if an action code is displayed after taking the remedy
when action code "E02" was displayed, or if "MAINTENANCE" is displayed together with action code "E01", do as
follows to check the failure code.
1. If an action code is displayed, pressed the top (>) portion of machine monitor mode selector switch (2) and check
the failure code. The failure code is displayed on character display (1).
2. Press the top (>) portion of machine monitor mode selector switch (2) again. The service meter and odometer
will be displayed for several seconds, and the screen will then return to the action code screen.
If more than one failure has occurred, the next failure code is displayed.
3. Check the failure code, then contact your Komatsu distributor for repairs.
REMARK
The 6-digit code displayed on the left of the line at the top of the character display is the failure code.
The code displayed at the right side of the failure code shows the controller that detected the failure code.
MON: Machine monitor
TM: Transmission controller
ENG: Engine controller
BK: Retarder controller
The line at the bottom of the character display shows the system where the failure was generated.
3 - 140
.
4-1
.
GUIDES TO MAINTENANCE
MAINTENANCE
GUIDES TO MAINTENANCE
Do not perform any inspection and maintenance operation that is not found in this manual.
CHECK SERVICE METER:
Check the service meter reading every day to see if the time has come for any necessary maintenance to be
performed.
KOMATSU GENUINE REPLACEMENT PARTS:
Use Komatsu genuine parts specified in the Parts Book as replacement parts.
KOMATSU GENUINE OILS:
For lubrication of the machine, use the Komatsu genuine lubricants. Moreover use oil of the specified viscosity
according to the ambient temperature.
ALWAYS USE CLEAN WASHER FLUID:
Use automobile window washer fluid, and be careful not to let any dirt get into it.
ALWAYS USE CLEAN OIL AND GREASE:
Use clean oil and grease. Also, keep the containers of the oil and grease clean. Keep foreign materials away from
oil and grease.
CHECKING FOREIGN MATERIALS IN DRAINED OIL AND ON FILTERS:
After changing the oil or replacing the filter, check the drained oil and filter for metal particles and foreign materials.
If large quantities of metal particles or foreign materials are found, always report to the person in charge and carry
out suitable action. In addition, when replacing the engine oil filter, fill the new filter with the specified clean oil, then
install it.
OIL CHANGE:
If your machine is equipped with a fuel strainer, do not remove it while fueling.
WELDING INSTRUCTIONS:
Turn off the engine starting switch.
Do not apply more than 200 V continuously.
Connect grounding the cable within 1 m (3.28 ft) from the area to be welded. Connecting grounding cable near
meters and connectors will lead to the failure of meters.
If a seal or bearing happens to come between the part being welded and grounding point, change the grounding
point to avoid such parts.
Do not use the area around the pins or the hydraulic cylinders as the grounding point.
Sparks will cause damage to the plated portion.
DO NOT DROP THINGS INSIDE MACHINE:
When opening inspection windows or the oil filler port of the tank to carry out inspection, be careful not to drop
nuts, bolts, or tools inside the machine.
If such things are dropped inside the machine, it may cause damage and/or malfunction of the machine, and will
lead to failure. If you drop anything inside the machine, always remove it immediately.
Do not put unnecessary things in your pockets. Carry only things which are necessary for inspection.
4-2
.
MAINTENANCE
GUIDES TO MAINTENANCE
DUSTY WORKSITES:
When working at dusty worksites, do as follows:
Inspect the dust indicator frequently to see if the air cleaner is clogged.
Clean the air cleaner element at a shorter interval than specified.
Clean the radiator core frequently to avoid clogging.
Clean and replace the fuel filter frequently.
Clean electrical components, especially the starting motor and alternator, to avoid accumulation of dust.
When inspecting or changing the oil, move the machine to a place that is free of dust to prevent dirt from getting
into the oil.
AVOID MIXING OILS:
If a different brand or grade of oil has to be added, drain the old oil and replace all the oil with the new brand or grade
of oil. Never mix different brand or grade of oil.
LOCKING INSPECTION COVERS:
Lock inspection cover securely into position with the lock bar. If inspection or maintenance is performed with
inspection cover not locked in position, there is a danger that it may be suddenly blow shut by the wind and cause
injury to the worker.
BLEEDING AIR FROM HYDRAULIC CIRCUIT:
If the hydraulic components have been repaired or replaced and if the hydraulic hoses, pipes, etc. have been
disconnected, it is necessary to bleed air in the circuit. See "WHEN REQUIRED (PAGE 4-20)".
PRECAUTIONS WHEN INSTALLING HYDRAULIC HOSES:
When removing parts at locations where there are O-rings or gasket seals, clean the mounting surface, and
replace with new parts.
When doing this, be careful not to forget to assemble the O-rings and gaskets.
When installing the hoses, do not twist them or bend them sharply. If they are installed so, their service life will
be shortened extremely and they may be damaged.
CHECKS AFTER INSPECTION AND MAINTENANCE:
If you forget to perform the checks after inspection and maintenance, unexpected problems may occur, and this may
lead to serious injury or property damage. Always do the following:
Checks after operation (with engine stopped)
Have any inspection and maintenance points been forgotten?
Have all inspection and maintenance items been performed correctly?
Have any tools or parts been dropped inside the machine? It is particularly dangerous if parts are dropped
inside the machine and get caught in the lever linkage mechanism.
Are there any leakage of coolant or oil? Have all nuts and bolts been tightened?
Check when the engine is running
See "TWO WORKERS FOR MAINTENANCE WHEN ENGINE IS RUNNING (PAGE 2-32)" in the section on
safety for checking when the engine is running. Pay enough attention for safety.
Check if the inspected and serviced area is normally operated.
Increase the engine speed to check for the leak of fuel and oil.
4-3
.
MAINTENANCE
OUTLINE OF SERVICE
OUTLINE OF SERVICE
Always use Komatsu genuine parts for replacement parts, grease or oil.
When changing the oil or adding oil, do not mix different types of oil. When changing the type of oil, drain all the
old oil and fill completely with the new oil. Always replace the filter at the same time. (There is no problem if the
small amount of oil remaining in the piping mixes with the new oil.)
Unless otherwise specified, when the machine is shipped from the factory, it is filled with the oil and coolant listed
in the table below.
Item
Type
Engine oil pan
Engine oil EO15W40DH (Komatsu genuine parts)
Transmission case
(incl. brake oil tank)
Power train oil TO10 (Komatsu genuine parts)
Hydraulic tank
Power train oil TO10 (Komatsu genuine parts)
Front suspension
Rear suspension
Hydraulic oil HO-MVK (Komatsu genuine parts)
Front differential case
Center differential case
Rear differential case
Front final drive case
Center final drive case
Rear final drive case
Axle oil AXO80 (Komatsu genuine parts)
Radiator
Supercoolant AF-NAC (Density:30% or above)(Komatsu genuine parts)
HANDLING OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC
OIL
Oil is used in the engine and hydraulic equipment under extremely severe conditions (high temperature, high
pressure), and deteriorates with use.
Always use oil that matches the grade and maximum and minimum ambient temperatures recommended in the
Operation and Maintenance Manual. Even if the oil is not dirty, always change the oil at the specified interval.
Oil corresponds to blood in the human body, always be careful when handling it to prevent any impurities (water,
metal particles, dirt, etc.) from getting in.
The majority of problems with the machine are caused by the entry of such impurities.
Take particular care not to let any impurities get in when storing or adding oil.
Never mix oils of different grades or brands.
Always add the specified amount of oil.
Having too much oil or too little oil are both causes of problems.
If the oil in the work equipment is not clear, there is probably water or air getting into the circuit. In such cases,
please contact your Komatsu distributor.
When changing the oil, always replace the related filters at the same time.
We recommend you have an analysis made of the oil periodically to check the condition of the machine. For
those who wish to use this service, please contact your Komatsu distributor.
When using commercially available oil, it may be necessary to reduce the oil change interval.
We recommend that you use the Komatsu oil clinic to carry out a detailed checks of the characteristics of the oil.
4-4
.
MAINTENANCE
OUTLINE OF SERVICE
FUEL
To prevent the moisture in the air from condensing and forming water inside the fuel tank, always fill the fuel tank
after completing the day's work.
The fuel pump is a precision instrument, and if fuel containing water or dirt is used, it cannot work properly.
Be extremely careful not to let impurities get in when storing or adding fuel.
Always use the fuel specified for the temperature in the Operation and Maintenance Manual.
If the fuel is used at temperatures lower than the specified temperature (particularly at temperatures below -15
°C (5°F), the fuel will solidify.
If the fuel is used at temperatures higher than the specified temperature, the viscosity will drop, and this may
result in problems such as a drop in output.
Before starting the engine, or when 10 minutes have passed after adding fuel, drain the sediment and water from
the fuel tank.
If the engine runs out of fuel, or if the filters have been replaced, it is necessary to bleed the air from the circuit.
If there is any foreign material in the fuel tank, wash the tank and fuel system.
NOTICE
Always use diesel fuel. Never use any other fuel.
The engine on this machine uses electronic control and high-pressure fuel injection equipment to enable it to provide good fuel
consumption and good exhaust gas characteristics. For this reason, high-precision parts and lubricating ability are demanded.
Using low-viscosity fuel with poor lubricating ability will cause a marked reduction in the durability of the engine.
COOLANT AND WATER FOR DILUTION
The coolant has the important function of preventing corrosion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of antifreeze coolant is essential.
Komatsu machines are supplied with Komatsu Supercoolant (AF-NAC). Komatsu Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
Komatsu Supercoolant (AF-NAC) is strongly recommended wherever available.
When using Komatsu Supercoolant (AF-NAC), there is no need to use a corrosion resistor. For details, see
"CLEAN INSIDE OF COOLING SYSTEM (PAGE 4-26)".
When diluting the antifreeze coolant, use distilled water or tap water (soft water).
Natural water, such as a river water or well water (hard water), contains large amounts of minerals (calcium,
magnesium, etc.), and this makes it easier for scale to form inside the engine or radiator. Once scale is deposited
inside the engine or radiator, it is extremely difficult to remove. It also causes overheating due to poor heat
exchange, so when you dilute the coolant, we recommend that you use water with an overall hardness of less
than 100 PPM.
When using antifreeze, always observe the precautions given in the Operation and Maintenance Manual.
Antifreeze coolant is flammable, so be sure to keep it away from flame.
The ratio of Supercoolant (AF-NAC) to water differs according to the ambient temperature.
For details of the ratio when mixing, see "CLEAN INSIDE OF COOLING SYSTEM (PAGE 4-26)".
Supercoolant (AF-NAC) may be supplied already mixed. In such cases, never dilute with water.
If the engine overheats, wait for the engine to cool before adding coolant.
If the coolant level is low, it will cause overheating, and will also cause problems with corrosion due to air entering
the coolant.
4-5
.
OUTLINE OF SERVICE
MAINTENANCE
GREASE
Grease is used to prevent seizure and noises at the joints.
This construction equipment is used under heavy-duty conditions. Always use the recommended grease and
follow the change intervals and recommended ambient temperatures given in this Operation and Maintenance
Manual.
The nipples not included in the maintenance section are nipples for overhaul, so they do not need grease.
If any part becomes stiff after being used for long time, add grease.
Always wipe off all of the old grease that is pushed out when greasing.
Be particularly careful to wipe off the old grease in places where sand or dirt sticking in the grease would cause
wear of the rotating parts.
4-6
.
MAINTENANCE
OUTLINE OF SERVICE
CARRYING OUT KOWA (Komatsu Oil Wear Analysis)
KOWA is a maintenance service that makes it possible to prevent machine failures and downtime. With KOWA, the
oil is periodically sampled and analyzed. This enables early detection of wear of the machine drive parts and other
problems.
We strongly recommend you to use this service. The oil analysis is carried out at actual cost, so the cost is low, and
the results of the analysis are reported together with recommendations which will reduce repair costs and machine
downtime.
KOWA ANALYSIS ITEMS
Measurement of density of metal wear particles
This uses an ICP (Inductively Coupled Plasma) analyzer to
measure the density of iron, copper, and other metal wear
particles in the oil.
Measurement of quantity of particles
This uses a PQI (Particle Quantifier Index) measurer to
measure the quantity of iron particles of 5µm or more, enabling
early detection of failures.
Others
Measurements are made of items such as the ratio of water in the oil, density of the antifreeze coolant, ratio of
fuel in the oil, and dynamic viscosity, enabling a highly precise diagnosis of the machine's health.
OIL SAMPLING
Sampling interval
250 hours: Engine
500 hours: Other components
Precautions when sampling
Make sure that the oil is well mixed before sampling.
Perform sampling at regular fixed intervals.
Do not perform sampling on rainy or windy days when water or dust can get into the oil.
For further details of KOWA, please contact your Komatsu distributor.
4-7
.
OUTLINE OF SERVICE
MAINTENANCE
STORING OIL AND FUEL
Keep indoors to prevent any water, dirt, or other impurities from getting in.
When keeping drum cans for a long period, put the drum on its side so that the filler port of the drums is at the side
to prevent moisture from being sucked in.
If drums have to be stored outside, cover them with a waterproof sheet or take other measures to protect them.
To prevent any change in quality during long-term storage, be sure to use in the order of first in - first out (use the
oldest oil or fuel first).
FILTERS
Filters are extremely important safety parts. They prevent impurities in the fuel and air circuits from entering
important equipment and causing problems.
Replace all filters periodically. For details, see the Operation and Maintenance Manual.
However, when working in severe conditions, replace the filters at shorter intervals according to the oil and fuel
(sulfur content) being used.
Never try to clean the filters (cartridge type) and use them again. Always replace with new filters.
When replacing oil filters, check if any metal particles are attached to the old filter. If any metal particles are found,
contact your Komatsu distributor.
When replacing the engine oil filter, fill the new filter with the specified clean oil, then install it.
Do not open packs of spare filters until just before they are to be used.
Always use Komatsu genuine filters.
OUTLINE OF ELECTRIC SYSTEM
It is extremely dangerous if the electrical equipment becomes wet or the covering of the wiring is damaged. This
will cause an electrical short circuit and may lead to malfunction of the machine. Do not wash the inside of the
operator's cab with water. When washing the machine, be careful not to let water get into the electrical
components.
Service relating to the electric system is checking fan belt tension, checking damage or wear to the fan belt and
checking battery fluid level.
Never install any electric components other than those specified by Komatsu.
External electro-magnetic interference may cause malfunction of the control system controller, before installing
a radio receiver or other wireless equipment, contact your Komatsu distributor.
When working at the seashore, carefully clean the electric system to prevent corrosion.
When installing an operator's cab cooler or any other electrical equipment, connect it to an independent power
source connector. The cables to supply power to the optional equipment must never be connected to the fuse,
starting switch, or battery relay.
4-8
.
MAINTENANCE
WEAR PARTS
WEAR PARTS
Wear parts such as the filter element, air cleaner element, etc. are to be replaced at the time of periodic maintenance
or before their abrasion limits.
The wear parts should be changed correctly in order to use the machine economically.
For part change, Komatsu genuine parts of excellent quality should be used.
When ordering parts, please check the part number in the parts book.
WEAR PARTS LIST
The parts in parentheses are to be replaced at the same time.
Item
Part No.
Part Name
Q'ty
Engine oil filter
600-211-1340
Cartridge
1
Fuel prefilter
600-319-3440
Cartridge
1
Fuel main filter
600-319-3520
Cartridge
1
Corrosion resistor
600-411-1151
Cartridge
1
Transmission oil filter
(Valve side)
714-07-28712
Cartridge
1
Transmission oil filter
(Brake cooling side)
07063-51210
(07000-F5180)
Element
(O-ring)
1
(1)
Brake oil filter
569-43-83920
(07000-12065)
(07001-02065)
Element
(O-ring)
(Back-up ring)
1
(1)
(1)
Hydraulic filter
07063-51142
(07000-F5180)
Element
(O-ring)
1
(1)
EVERY 2000 HOURS
600-185-6100
Element Ass'y
1
-
600-185-6110
Outer element
1
-
Air cleaner
Replacement frequency
EVERY 500 HOURS
EVERY 1000 HOURS
4-9
.
RECOMMENDED FUEL, COOLANT, AND LUBRICANT
MAINTENANCE
RECOMMENDED FUEL, COOLANT, AND LUBRICANT
Komatsu genuine oils are adjusted to maintain the reliability and durability of Komatsu construction equipment
and components.
In order to keep your machine in the best conditioner for long periods of time, it is essential to follow the
instructions in this Operation and Maintenance Manual.
Failure to follow these recommendations may result in shortened life or excess wear of the engine, power train,
cooling system, and/or other components.
Commercially available lubricant additives may be good for the machine, but they may also cause harm.
Komatsu does not recommend any commercially available lubricant additive.
Use the oil recommended according to the ambient temperature in the chart below.
Specified capacity means the total amount of oil including the oil in the tank and the piping. Refill capacity means
the amount of oil needed to refill the system during inspection and maintenance.
When starting the engine in temperatures below 0°C (32°F), be sure to use the recommended multi-grade oil,
even if the ambient temperature may become higher during the course of the day.
If the machine is operated at a temperature below -20°C (-4°F), a separate device is needed, so consult your
Komatsu distributor.
When the fuel sulfur content is less than 0.2%, change the engine oil according to the period inspection table
given in this Operation and Maintenance Manual.
If the fuel sulfur content is more than 0.2%, change the oil according to the following table.
Sulfur content (%)
Oil change interval
Less than 0.2%
500 hours
0.2 to 0.5%
250 hours
0.5% and up
Not recommendable (*)
* If these fuels are used, there is danger that serious trouble may occur because of early deterioration of the engine
oil or early wear of the internal parts of the engine. If the local situation makes it necessary to use these fuels,
always remember the following.
1) Be sure to check Total Basic Number (TBN) of oil frequently by TBN handy checker etc., and change oil
based on the result.
2) Always be aware that oil change interval is extremely shorter than standard.
3) Be sure to carry out periodic engine inspection by distributor's expert since change interval of periodic
replacement parts and overhaul interval are also shorter.
4 - 10
.
MAINTENANCE
RECOMMENDED FUEL, COOLANT, AND LUBRICANT
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE
ASTM: American Society of Testing and Material
4 - 11
.
MAINTENANCE
RECOMMENDED FUEL, COOLANT, AND LUBRICANT
Reservoir
Engine oil
pan
Transmission
case
(Incl. brake
oil tank)
Hydraulic
tank
Front
suspension
(each)
Rear
suspension
(each)
Front
differential
Liters
44
165
171
3
2.2
14
US gal
11.62
43.59
45.18
0.79
0.58
3.70
Liters
37
77.5
120
3
2.2
14
US gal
9.78
20.48
31.70
0.79
0.58
3.70
Center
differential
case
Center final
drive case
(each)
Rear
differential
case
Rear final
drive case
(each)
Fuel tank
Cooling
system
25
6.61
24.5
6.47
4.0
1.06
3.5
0.92
25
6.61
25
6.61
5.0
1.32
4.5
1.19
384
101.45
–
–
65
17.17
59
15.59
Capacity
Specified
Refill
Capacity
Specified
Refill
Reservoir Front final
drive case
(each)
Liters
US gal
Liters
US gal
4.5
1.19
4.0
1.06
NOTICE
Always use diesel oil for the fuel.
To ensure good fuel consumption characteristics and exhaust gas characteristics, the engine mounted on this machine uses an
electronically controlled high-pressure fuel injection device. This device requires high precision parts and lubrication, so if low
viscosity fuel with low lubricating ability is used, the durability may drop markedly.
Note 1: HTHS ( High-Temperature High-Shear Viscosity 150°C), specified by ASTM D4741 must be equal to or
higher than 3.5 mPa-S. Komatsu EOS0W30 and EOS5W40 are the most suitable oils.
Note 2: Powertrain oil has different properties from engine oil. Be sure to use the recommended oils.
Note 3: Hyper grease (G2-T, G2-TE) has a high performance.
When it is necessary to improve the lubricating ability of the grease in order to prevent squeaking of pins and
bushings, the use of G2-T or G2-TE is recommended.
Note 4: Supercoolant (AF-NAC)
1) Coolant has the important function of anticorrosion as well as antifreeze.
Even in the areas where freezing is not an issue, the use of antifreeze coolant is essential.
Komatsu machines are supplied with Komatsu Supercoolant AF-NAC. Komatsu Supercoolant AF-NAC has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
Komatsu Supercoolant AF-NAC is strongly recommended wherever available.
2) For details of the ratio when diluting super coolant with water, see "CLEAN INSIDE OF COOLING SYSTEM
(PAGE 4-26)".
Supercoolant AF-NAC may be supplied in premix. In this case, always top off with premix solution. (never dilute
with water)
3) To maintain the anticorrosion properties of Supercoolant AF-NAC, always keep the density of Supercoolant
between 30% and 68%.
RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS OTHER THAN
KOMATSU GENUINE OIL
When using commercially available oils other than Komatsu genuine oil, consult your Komatsu distributor.
4 - 12
.
MAINTENANCE
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
TORQUE LIST
Unless otherwise specified, tighten the metric nuts and bolts to the torque shown in the table below.
The tightening torque is determined by the width across the flats (b) of the nut and bolt.
If it is necessary to replace any nut or bolt, always use a Komatsu genuine part of the same size as the part that was
replaced.
Thread
diameter
of bolt
(a)(mm)
Width
across
flats
(b)(mm)
Nm
kgm
lbft
Nm
kgm
lbft
6
8
10
12
14
10
13
17
19
22
13.2
31
66
113
177
1.35
3.2
6.7
11.5
18
9.8
23.1
48.5
83.2
130.2
11.8-14.7
27-34
59-74
98-123
157-196
1.2-1.5
2.8-3.5
6.0-7.5
10.0-12.5
16.0-20.0
8.7-10.8
20.3-25.3
43.4-54.2
72.3-90.4
115.7-144.7
16
18
20
22
24
24
27
30
32
36
279
382
549
745
927
28.5
39
56
76
94.5
206.1
282.1
405.0
549.7
683.5
245-309
343-425
490-608
662-829
824-1030
25.0-31.5
35.0-43.5
50.0-62.0
67.5-84.5
84.0-105.0
180.8-227.8
253.2-314.6
361.7-448.4
488.2-611.2
607.6-759.5
27
30
33
36
39
41
46
50
55
60
1320
1720
2210
2750
3280
135.0
175.0
225.0
280.0
335.0
976.5
1265.8
1627.4
2025.2
2423.1
1180-1470
1520-1910
1960-2450
2450-3040
2890-3630
120.0-150.0
155.0-195.0
200.0-250.0
250.0-310.0
295.0-370.0
868.0-1085.0
1121.1-1410.4
1446.6-1808.3
1808.3-2242.2
2133.7-2676.2
Tightening torque
Target value
Service limit
NOTICE
When tightening panels or other parts having tightening fixtures made of plastic, be careful not to use excessive torque: doing
so will damage the plastic parts. Pay enough attention when you tighten up.
Apply the following table for Hydraulic Hose.
Taper seal
Thread
diameter
of bolt
(a)(mm)
Width
across
flats
(b)(mm)
Nm
kgm
lbft
Nm
kgm
lbft
10
14
14.7
1.5
10.8
12.7-16.7
1.3-1.7
9.4-12.3
14
19
29.4
3.0
21.7
27.5-39.2
2.8-4.0
20.3-28.9
18
24
78.5
8.0
57.3
58.8-98.1
6.0-10.0
43.4-72.3
22
27
117.7
12.0
86.8
88.3-137.3
9.0-14.0
65.1-101.3
24
32
147.1
15.0
108.5
117.7-176.5 12.0-18.0
86.8-130.2
30
36
215.7
22.0
159.1
176.5-245.2 18.0-25.0
130.2-180.8
33
41
255.0
26.0
188.1
215.7-284.4 22.0-29.0
159.1-209.8
Tightening torque
Target value
Service limit
4 - 13
.
MAINTENANCE
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
Face seal
Nominal No. of
threads (a)
Width
Tightening torque
across
Target value
Permissible range
flats (b)
Nm
kgm
lbft
(mm) Nm kgm lbft
9/16 -18UNF
19
44
4.5
32.5
35 - 63
3.5 - 6.5
25.3 - 47.0
11/16 -16UN
22
74
7.5
54.2
54 - 93
5.5 - 9.5
39.8 - 68.7
13/16 -16UN
27
103 10.5
75.9 84 - 132 8.5 - 13.5
61.5 - 97.6
1 -14UNS
32
157 16.0 115.7 128 - 186 13.0 - 19.0 94.0 - 137.4
13/16 -12UN
36
216 22.0 159.1 177 - 245 18.0 - 25.0 130.2 - 180.8
4 - 14
.
MAINTENANCE
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
To ensure safety at all times when operating or driving the machine, the user of the machine must always carry out
periodic maintenance. In addition, to further improve safety, the parts in the safety-critical parts list on the next page
must also be replaced at the specified interval. These parts are particularly closely connected to safety and fire
prevention, so please contact your Komatsu distributor to have them replaced.
Material quality of these parts can change as time passes and they are likely to wear out or deteriorate. However,
it is difficult to determine the extent of wear or deterioration at the time of periodic maintenance. Hence, it is required
to replace them with new ones regardless of their condition after a certain period of usage. This is important to
ensure that these parts maintain their full performance at all times.
Furthermore, should anything abnormal be found on any of these parts, replace it with a new one even if the periodic
replacement time for the part has not yet arrived.
If any of the hose clamps show deterioration like deformation or cracking, replace the clamps at the same time as
the hoses.
Also perform the following checks with hydraulic hoses which need to be replaced periodically. Tighten all loose
clamps and replace defective hoses, as required.
When replacing hoses, always replace O-rings, gaskets, and other such parts at the same time.
4 - 15
.
MAINTENANCE
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
SAFETY CRITICAL PARTS
No.
Safety critical parts for periodic replacement
1
Fuel hose (fuel tank - injection pump)
2
Fuel hose (injection pump - fuel tank)
3
Spill hose (engine output connector - fuel tank)
4
Water separator (case, O-ring, plug)
5
Rubber hose for brake piping
6
High-pressure hose in steering oil pressure circuit
(pump ←→ demand valve ←→ steering valve ←→ steering cylinder)
7
High-pressure hose in hoist circuit
(pump ←→ demand valve ←→ hoist valve ←→ hoist cylinder)
8
Hose at discharge side of retarder cooling pump
9
Hose at discharge side of transmission pump
10
High-pressure hose in brake control circuit
(pump ←→ accumulator charge valve ←→ accumulator)
11 Brake valve parts
12 Parking brake valve parts
13 Accumulator charge valve parts
14 Retarder control valve parts
Replacement interval
Remarks
Every 4000 hours
or 2 years,
whichever
comes sooner
Every 2000 hours
or 1 year,
whichever
comes sooner
Replace as
service kit
Every 3 years
Replace
15 Parking brake chamber parts
16 Slack adjuster parts
17 Seat belt
4 - 16
.
MAINTENANCE
MAINTENANCE SCHEDULE CHART
MAINTENANCE SCHEDULE CHART
MAINTENANCE SCHEDULE CHART
INITIAL 250 HOURS SERVICE (ONLY AFTER THE FIRST 250 HOURS)
Change oil in engine oil pan, replace engine oil filter cartridge
Replace fuel prefilter cartridge
Replace fuel main filter cartridge
Replace transmission filter element (valve side, brake cooling side)
Change oil in transmission case
Change oil in brake oil tank, replace brake oil filter element
Change oil in final drive case
Change oil in differential case
Replace hydraulic filter element
Change oil in hydraulic tank
4444444444-
53
54
60
62
63
65
71
72
73
77
WHEN REQUIRED
Check, clean or replace air cleaner
Clean inside of cooling system
Check level of window washer fluid, add fluid
Clean air conditioner air filter
Check refrigerant (gas) level
Check dump body
Check length of suspension cylinder
Bleed air from front brake
Bleed air from center brake
Check play of output coupling of output shaft
Selection and inspection of tires
Adjust parking brake
Cleaning hydraulic tank strainer
4444444444444-
20
26
29
29
30
31
31
32
33
34
35
37
38
CHECK BEFORE STARTING
EVERY 50 HOURS SERVICE
Lubrication
4- 40
EVERY 250 HOURS SERVICE
Lubrication
Check drive shaft
Clean overflow hose
Check level of battery electrolyte
Check fan belt and alternator belt tension, adjust
Check air conditioner compressor belt tension, adjust
Check frame, A-arm
Check braking capacity of foot brake
Check braking capacity of retarder brake
Check braking capacity of parking brake
Check wear of parking brake pads
Check of accumulator gas pressure
444444444444-
41
43
44
45
47
48
49
50
50
51
51
52
4 - 17
.
MAINTENANCE SCHEDULE CHART
MAINTENANCE
EVERY 500 HOURS SERVICE
Change oil in engine oil pan, replace engine oil filter cartridge
Replace fuel prefilter cartridge
Lubricate cab mount pin (left and right: 1 place each)
Check oil level in final drive case, add oil
Check oil level in differential case, add oil
Clean, check radiator fins and after cooler fins
Recover oil leaking from floating seal
4444444-
53
54
55
55
56
57
58
EVERY 1000 HOURS SERVICE
Replace fuel main filter cartridge
Replace corrosion resistor cartridge
Replace transmission filter element
Change oil in transmission case
Change oil in brake oil tank, replace brake oil filter element
Lubrication
Check wear of brake disc
Check of engine air intake piping clamps for looseness
44444444-
60
61
62
63
65
68
69
70
EVERY 2000 HOURS SERVICE
Change oil in final drive case
Change oil in differential case
Replace hydraulic filter element
Clean transmission case strainer
Clean breather
Check accumulator gas pressure
Check alternator
Check, adjust engine valve clearance
Check vibration damper
444444444-
71
72
73
74
74
76
76
76
76
EVERY 4000 HOURS SERVICE
Change oil in hydraulic tank
Check starting motor
Check water pump
Check air compressor
Check fan pulley and tension pulley
Checking for looseness of high-pressure clamp, hardening of rubber
Checking for missing fuel spray prevention cap, hardening of rubber
4444444-
77
77
77
77
77
78
78
EVERY 6000 HOURS SERVICE
Lubricate drive shaft
4- 79
EVERY 8000 HOURS SERVICE
Replace high-pressure piping clamp
Replace fuel spray prevention cap
Overhaul starting motor and alternator
4- 80
4- 80
4- 80
4 - 18
.
MAINTENANCE
SERVICE PROCEDURE
SERVICE PROCEDURE
INITIAL 250 HOURS SERVICE (ONLY AFTER THE FIRST 250 HOURS)
Perform the following maintenance only after the first 250 hours.
Change oil in engine oil pan, replace engine oil filter cartridge
Replace fuel prefilter cartridge
Replace fuel main filter cartridge
Replace transmission filter element (valve side, brake cooling side)
Change oil in transmission case
Change oil in brake oil tank, replace brake oil filter element
Change oil in final drive case
Change oil in differential case
Replace hydraulic filter element
Change oil in hydraulic tank
For details of the method of replacing or maintaining, see EVERY 500 HOURS, EVERY 1000 HOURS, EVERY
2000 HOURS SERVICE and EVERY 4000 HOURS SERVICE.
4 - 19
.
SERVICE PROCEDURE
MAINTENANCE
WHEN REQUIRED
CHECK, CLEAN OR REPLACE AIR CLEANER
After the outer element has been cleaned 6 times, or if the air cleaner element has been used for one year, replace
the outer element, inner element, and O-ring. For details of the procedure for replacement, see "REPLACE
ELEMENT (PAGE 4-24)".
If the maintenance caution lamp lights up and the character display displays action code "E01" and "AIR FILTER"
during operation immediately after the outer element is cleaned, replace the element even if the outer element has
not been cleaned 6 times or the air cleaner element has not been used more than 1 year.
CHECKING
NOTICE
Do not replace the element before the dust indicator reaches 7.5 kPa. If it is cleaned frequently, the filtering effect of the air cleaner
will drop, and this will reduce the service life of the engine.
1. Check if the dust indicator (1) displays 7.5 kPa. If it is
displaying 7.5 kPa, clean the outer element.
REMARK
There is maintenance caution lamp (2) on the machine monitor. If
the maintenance caution lamp lights up and the character display
(3) displays "E01" and "AIR FILTER" during operation, the air
cleaner is clogged. Clean the air cleaner element in this case, too.
4 - 20
.
MAINTENANCE
SERVICE PROCEDURE
CLEAN OUTER ELEMENT
WARNING
Dirt will fly if compressed air is used for cleaning. If dirt gets into your eyes it may cause blindness, and if you breathe in the
dust it may damage your lungs. To prevent these problems, always wear safety glasses, dust mask, and other protective
equipment.
When pulling out the air cleaner element, make sure that you are standing on a firm place. If your footing is not secure when
you carry out the operation, there is danger of falling and suffering injury.
NOTICE
When cleaning the element, clean only the outer element. Do not clean the inner element. There is danger that dirt and dust may
get inside the engine when the outer element is being cleaned, and this will damage the engine.
1. Stop the engine.
2. Remove 6 hooks (5) of dust cup (4), then remove the dust cup.
3. Hold outer element (6) with both hands, and move it up and
down and to the left and right while pulling it out.
4. Hold inner element (7) so that it does not come out, and clean
the inside of the air cleaner body with a dry cloth.
5. Use a dry cloth or compressed air to clean off the dirt stuck to
dust cup (4) and vacuator valve (8).
6. Check that there are no cracks in the lip of the vacuator valve
(8). If any cracks are found, replace with a new part.
NOTICE
If a damaged element is used, dust will pass the air cleaner filter and be sucked into the engine. Do not use any cleaning
method that will damage the element. If the element is damaged, replace it with a new element.
Never tap or hit the element against any other object when cleaning it.
Do not use an element with damaged folds or a damaged gasket or seal.
4 - 21
.
SERVICE PROCEDURE
7. Blow dry compressed air (0.69 MPa {7 kg/cm2}) from the inside
of outer element (6) along the folds. Next, blow along the folds
from the outside, then blow again from the inside.
8. After cleaning, shine a light bulb from inside outer element (6)
to check. If any holes or thin places are found, replace the
outer element.
9. Install outer element (6) in the air cleaner body.
10. Check that O-ring (9) is fitted to dust cup (4).
Next, set so that vacuator valve (8) of dust cup (4) is at the
bottom, and insert it into the air cleaner body.
11. Clip hooks (5) of dust cup (4) to the protruding parts of the air
cleaner body to lock in position.
4 - 22
MAINTENANCE
.
MAINTENANCE
SERVICE PROCEDURE
12. Push the head of dust indicator (1) to cancel the clogging
display.
4 - 23
.
MAINTENANCE
SERVICE PROCEDURE
REPLACE ELEMENT
WARNING
When pulling out the air cleaner element, make sure that you are standing on a firm place. If your footing is not secure when you
carry out the operation, there is danger of falling and suffering injury.
1. Stop the engine.
2. Remove 6 hooks (5) of dust cup (4), then remove the dust cup.
3. Hold outer element (6) with both hands, and move it up and
down and to the left and right while pulling it out.
4. Hold inner element (7) so that it does not come out, and clean
the inside of the air cleaner body with a dry cloth.
5. Use a dry cloth or compressed air to clean off the dirt stuck to
dust cup (4) and vacuator valve (8).
6. Check that there are no cracks in the lip of the vacuator valve
(8). If any cracks are found, replace with a new part.
7. Pull out inner element (7) and install a new inner element.
8. Install outer element (6) in the air cleaner body.
4 - 24
.
MAINTENANCE
SERVICE PROCEDURE
9. Replace O-ring (9) with a new part.
Next, set so that vacuator valve (8) of dust cup (4) is at the
bottom, and insert it into the air cleaner body.
10. Clip hooks (5) of dust cup (4) to the protruding parts of the air
cleaner body to lock in position.
11. Push the head of dust indicator (1) to cancel the clogging
display.
4 - 25
.
MAINTENANCE
SERVICE PROCEDURE
CLEAN INSIDE OF COOLING SYSTEM
WARNING
Immediately after the engine is stopped, the engine coolant is hot and the pressure inside the radiator is high. Removing the
cap and draining the water under this condition could cause burns. Allow the engine to cool down, then turn the cap slowly
to release the pressure.
Start the engine and flush the system. When standing up or leaving the operator's seat, set the shift lever to the N position and
set the parking brake switch to the PARKING position.
For details of starting the engine, see "OPERATIONS, CHECKS BEFORE STARTING (PAGE 3-84)" and "STARTING ENGINE
(PAGE 3-85)" in the OPERATION section of the Operation and Maintenance Manual.
When the undercover is removed, there is danger of touching the fan.
Never go to the front of the machine when the engine is running.
Clean the inside of the cooling system, change the coolant and replace the corrosion resistor according to the table
below.
Antifreeze coolant
Interval for cleaning inside of cooling system
and changing antifreeze coolant
Replacing corrosion resistor
Komatsu supercoolant
(AF-NAC)
Every two years or every 4000 hours
whichever comes first
unnecessary
Permanent type antifreeze
(All-season type, *)
Every year (autumn) or every 2000 hours
whichever comes first
Every 1000 hours
and when cleaning the inside
of the cooling system
and when changing coolant
*: Permanent type antifreeze shall meet the requirements of ASTM D3306-03.
Stop the machine on level ground when cleaning or changing the coolant.
The coolant has the important function of preventing corrosion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of antifreeze coolant is essential.
Komatsu machines are supplied with Komatsu Supercoolant (AF-NAC). Komatsu Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
Komatsu Supercoolant (AF-NAC) is strongly recommended wherever available.
To maintain the anticorrosion properties of Supercoolant (AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
When using Komatsu Supercoolant (AF-NAC), there is no need to use a corrosion resistor.
When no corrosion resistor is used, use the special cover (600-411-9000). Please consult your Komatsu distributor
about the method of installing.
4 - 26
.
MAINTENANCE
SERVICE PROCEDURE
When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mixing
table given below.
It is actually better to estimate and temperature about 10°C (18°F) lower when deciding the mixing ratio.
The mixing ratio depends on the ambient temperature, but it should always be a minimum of 30% by volume
(antifreeze/total amount of coolant x 100).
The freezing temperature of undiluted antifreeze is -15°C (5°F). Do not store undiluted antifreeze at a temperature
of below -15°C (5°F).
Mixing rate of water and antifreeze
Min. atmospheric
temperature
Amount of antifreeze
Amount of water
Volume ratio
°C
-10
-15
-20
-25
-30
°F
14
5
-4
-13
-22
Liters
17.5
20.5
23.5
26.5
29.5
US gal
4.62
5.42
6.21
7.00
7.79
Liters
41.5
38.5
35.5
32.5
29.5
US gal
10.97
10.17
9.38
8.59
7.80
%
30
35
40
45
50
WARNING
Antifreeze coolant is flammable, so keep it away from flame.
Antifreeze coolant is toxic. When removing the drain plug, be careful not to get water containing antifreeze coolant on you. If it
gets in your eyes, flush your eyes with large amount of fresh water and see a doctor at once.
Use antifreeze and appropriate water for diluting (for details, see "COOLANT AND WATER FOR DILUTION (PAGE
4-5)")
We recommend use of an antifreeze density gauge to control the mixing proportions.
Prepare a container whose capacity is larger than the specified coolant volume to catch drained coolant.
Prepare a hose to supply antifreeze coolant and water.
1. Stop the engine.
2. Open the underguard (1) of the engine and take out coolant
drain hoses (3 pieces).
3. Turn and close valve (2) of the corrosion resistor.
4 - 27
.
SERVICE PROCEDURE
MAINTENANCE
4. Loosen radiator cap (3) a little to release the residual pressure
and then remove it.
5. Open drain valve (4) at the bottom of the radiator and drain
valve (5) of the oil cooler and drain the coolant.
6. After draining the coolant, close drain valves (4) and (5), and fill
with city water.
7. When the radiator is full, start the engine, and run it at low
idling.
Keep the engine running at low idling for 10 minutes until the
water temperature reaches more than 90°C (194°F) (guideline:
the indicator on the engine water temperature gauge is
horizontal).
8. Stop the engine, open drain valves (4) and (5), and drain the
water. After draining the water, close them.
9. Replace the corrosion resistor, then turn valve (2) to open it.
For replacing corrosion resistor, see "REPLACE
CORROSION RESISTOR CARTRIDGE (PAGE 4-61)".
10. Add coolant mixed with antifreeze until it overflows from the
water filler.
Decide the proportions of antifreeze and water according to the
table for the mixing rate of water and antifreeze.
11. To remove the air contained in the coolant, run the engine at low idle for 5 minutes, then run for another 5
minutes at high idle. (When doing this, leave the coolant filler cap OFF.)
12. Stop the engine. About 3 minutes later, supply the coolant up to the coolant filler, then close radiator cap.
13. Drain the coolant from inside of reservoir tank (6), flush the
inside of the reservoir tank, then fill with the coolant to a point
between the FULL and LOW marks.
4 - 28
.
MAINTENANCE
SERVICE PROCEDURE
CHECK LEVEL OF WINDOW WASHER FLUID, ADD FLUID
Carry out this check if there is air in the window washer fluid.
Check the level of the fluid in window washer tank (1), and if it is
low, fill with automobile window washer fluid.
Be careful not to let dirt or dust get in when adding fluid.
When operating at below freezing point, use fluid with antifreeze.
CLEAN AIR CONDITIONER AIR FILTER
If the air filter at the suction port of the air conditioner unit or the air filter at the fresh air intake port become clogged,
the cooling or heating capacity will drop, so clean the filters once a week.
1. Open cover (1) on the side of the cab.
2. Pull out the air filter (FRESH filter) and clean it with
compressed air.
3. Open cover (2) at the right side at the rear of the operator's
seat.
4. Pull out the air filter (RECIRC filter), then use a weak jet of
compressed air to blow off the dust or clean with a soft brush.
4 - 29
.
MAINTENANCE
SERVICE PROCEDURE
CHECK REFRIGERANT (GAS) LEVEL
WARNING
If the refrigerant used in the air conditioner gets into your eyes or on your hands, it may cause loss of sight or frostbite. Do not
touch the refrigerant. Never loosen any part of the refrigerant circuit.
Do not bring any flame close to any point where the refrigerant gas is leaking.
If the cooling effect is poor, there is probably lack of refrigerant
(gas).
In this case, check sight glass (2) of receiver drier (1) near the left
side of the radiator guard.
Before carrying out inspection, set to the following conditions.
Start the engine and run it at approx. 1,500 rpm.
Turn the air conditioner ON/OFF switch to the ON position.
Set the air flow to the maximum position.
Set the temperature to the lowest position.
Open the doors and windows fully.
Turn the air conditioner switch ON.
If the condition of sight glass (2) is "correct" as shown in the
diagram on the right, the condition is normal. (After the air
conditioner switch is turned ON, a small number of bubbles will be
seen, but after that, the fluid becomes a transparent, milky white
color.)
If the condition of sight glass (2) is "insufficient" as shown in the
diagram on the right, there is lack of refrigerant, so ask your
Komatsu distributor to charge with refrigerant. (After the air
conditioner switch is turned ON, bubbles can be seen
continuously.)
4 - 30
.
MAINTENANCE
SERVICE PROCEDURE
CHECK DUMP BODY
Check that there are no cracks in the dump body.
1. Clean the dump body to make it easier to check.
2. Check all parts of the dump body for damage.
If any cracks or abnormal wear are found, carry out repairs.
Contact your Komatsu distributor for details of the repair procedure.
CHECK LENGTH OF SUSPENSION CYLINDER
When traveling, if the unevenness of the road surface is transmitted directly to the chassis (the machine bounces
or the cylinders retract and hit the stopper), carry out the following checks.
CHECK LENGTH OF CYLINDER
When checking front suspension (1) and rear suspension (2), carry
out the inspection with the machine unloaded.
1. Remove cover (3).
2. Measure distance (A) from the shoulder at the head end of the
suspension cylinder rod to the top surface of the flange.
Front suspension dimension (A): 153 to 173 mm (6.0 to 6.8 in)
Rear suspension dimension (A): 96 to 106 mm (3.8 to 4.2 in)
3. If any abnormality is found when checking the front and rear
suspension, please contact your Komatsu distributor for
inspection.
4 - 31
.
MAINTENANCE
SERVICE PROCEDURE
BLEED AIR FROM FRONT BRAKE
WARNING
Stop the machine on level ground and put blocks under the wheels before bleeding the air.
To make it easier to bleed the air, warm the oil up to a temperature of at least 40°C (104°F) before bleeding the air.
Bleed the air from the front brakes in the same way on both the left and right sides.
1. Start the engine, check that the oil in the transmission case is the specified level, and check if the retarder oil
pressure caution lamp is out.
2. Remove the cap installed to bleeder screw (1) of the slack
adjuster, then insert a vinyl hose.
Prepare a container with oil in it and insert the other end of the
hose approx. 50 mm (2.0 in) below the surface of the oil.
(Use any commercially available vinyl hose.)
3. Depress the brake pedal and loosen bleeder screw (1) approx.
3/4 turns. Keep the pedal depressed until no more bubbles
come out from the vinyl hose.
4. Pull the retarder control lever and loosen bleeder screw (1)
approx. 3/4 turns. Keep the retarder control lever depressed
until no more bubbles come out from the vinyl hose.
5. After bleeding the air, tighten bleeder screw (1) securely and fit
the cap.
6. The procedure for bleeder screw (2) of the front brake is the
same as for the slack adjuster (with Step 4 excluded).
NOTICE
The brake oil pressure caution lamp may light on during air bleeding. In
that case, tighten the bleeder screw and depress the brake pedal 8 to 10
times to charge pressure to the accumulator.
In addition, check sight gauge (H) to see if some oil remains in the brake oil
tank. If there is no oil left, stop the engine and add oil. (When the engine
stops, the oil level rises and the brake oil tank is automatically refilled with
oil.)
7. After finishing air bleeding, stop the engine (for 2 to 3 minutes),
and adjust the oil level so that it reaches the specified level. For
details, see "CHECK OIL LEVEL IN TRANSMISSION CASE,
ADD OIL (PAGE 3-75)".
4 - 32
.
MAINTENANCE
SERVICE PROCEDURE
BLEED AIR FROM CENTER BRAKE
WARNING
Stop the machine on level ground and put blocks under the wheels before bleeding the air.
To make it easier to bleed the air, warm the oil up to a temperature of at least 40°C (104°F) before bleeding the air.
Bleed the air from the center brakes in the same way on both the left and right sides.
1. Start the engine, check that the oil in the transmission case is the specified level, and check if the retarder oil
pressure caution lamp is out.
2. Remove the cap installed to bleeder screw (1) of the slack
adjuster, then insert a vinyl hose.
Prepare a container with oil in it and insert the other end of the
hose approx. 50 mm (2.0 in) below the surface of the oil.
(Use any commercially available vinyl hose.)
3. Depress the brake pedal and loosen bleeder screw (1) approx.
3/4 turns. Keep the pedal depressed until no more bubbles
come out from the vinyl hose.
4. Pull the retarder control lever and loosen bleeder screw (1)
approx. 3/4 turns. Keep the retarder control lever depressed
until no more bubbles come out from the vinyl hose.
5. After bleeding the air, tighten bleeder screw (1) securely and fit
the cap.
6. The procedure for bleeder screw (2) of the center brake is the
same as for the slack adjuster (with Step 4 excluded).
NOTICE
The brake oil pressure caution lamp may light on during air bleeding. In
that case, tighten the bleeder screw and check sight gauge (H) to see if
some oil remains in the brake oil tank. If there is no oil left, stop the engine
and fill with oil. (When the engine stops, the oil level rises and the brake oil
tank is automatically refilled with oil.)
7. After finishing air bleeding, stop the engine (for 2 to 3 minutes),
and adjust the oil level so that it reaches the specified level. For
details, see "CHECK OIL LEVEL IN TRANSMISSION CASE,
ADD OIL (PAGE 3-75)".
4 - 33
.
SERVICE PROCEDURE
CHECK PLAY OF OUTPUT COUPLING OF OUTPUT SHAFT
If any abnormal noise occurs around the output shaft or front drive
shaft, the rubber inside the output shaft may be deteriorated or
damaged, so check the play of the coupling as follows.
Play in circumferential direction
Using a bar, move the coupling in the direction of the
circumference and check the play in the circumferential direction at
the outside diameter of the coupling.
Standard: Max. 12 mm (0.5 in)
REMARK
If the play range is exceeded, the engine fan will start to rotate, so
when inspecting the play, check first that the engine fan is not
rotating.
If the result of the measurement shows that it is greater than the
standard value, please contact your Komatsu distributor for
disassembly and inspection.
4 - 34
MAINTENANCE
.
MAINTENANCE
SERVICE PROCEDURE
SELECTION AND INSPECTION OF TIRES
WARNING
If a tire or a rim is handled improperly, the tire may burst or may be
damaged and the rim may be broken and scattered, and that can cause
serious injury or death.
Since maintenance, disassembly, repair and assembly of the tires and
rims require special equipment and skill, be sure to ask a tire repair
shop to do the work.
Do not heat or weld the rim to which the tire is installed. Do not make a
fire near the tire.
SELECTION OF TIRES
WARNING
Select the tires according to the conditions of use and the weight of the attachments on the machine. Use only specified tires and
inflate them to the specified pressure.
Select the tires according to the conditions of use and the weight of the attachments of the machine. Use the
following table.
Since the travel speed indicated on the speedometer varies with the tire size, consult your Komatsu distributor when
using optional tires.
Maximum load [kg (lb)]
Tire size
Front wheel
8250 (18191)
23.5-R25
Center wheel
8250 (18191)
23.5-R25
Rear wheel
8250 (18191)
23.5-R25
Remarks
Type 1 for construction
equipment
4 - 35
.
MAINTENANCE
SERVICE PROCEDURE
CHECK OF INFLATION PRESSURE OF TIRES AND INFLATION OF THEM
WARNING
When inflating a tire, check that any person will not enter the working
area and use an air chuck which has a clip and which can be fixed to the
air valve.
While inflating the tire, check the inflation pressure occasionally so that
it will not rise too high.
If the rim is not fitted normally, it may be broken and scattered while the
tire is inflated. Accordingly, place a guard around the tire and do not
work in front of the rim but work on the tread side of the tire.
Abnormal drop of inflation pressure and abnormal fitting of the rim
indicate a trouble in the tire or rim. In this case, be sure to ask a tire
repair shop for repair.
Be sure to observe the specified inflation pressure.
Do not adjust the inflation pressure of the tires just after high-speed
travel or heavy-load work.
Check
Measure the inflation pressure with a tire pressure gauge, while the tires are cool, before starting work.
Inflation of tires
Adjust the inflation pressure properly.
When inflating a tire, use an air chuck which can be fixed to the air valve of the tire as shown in the figure. Do not
work in front of the rim but work on the tread side of the tire.
The proper inflation pressure is shown below.
Tire size
Inflation pressure [MPa (kg/cm2, PSI)]
Front
Center
Rear
23.5-R25 (standard)
0.44 (4.5, 63.9)
0.44 (4.5, 63.9)
0.44 (4.5, 63.9)
750/65 R25 (30/65 R25) (if equipped)
0.34 (3.5, 49.7)
0.40 (4.1, 58.2)
0.40 (4.1, 58.2)
NOTICE
If the tires are used when the inflation pressure is less than the value given in the table above, the rim may be damaged.
Always keep the tire inflation pressure within +0 to +0.03 MPa (0.3 kg/cm2, 4.3 PSI) of the value in the table above.
PRECAUTIONS WHEN REPLACING TIRE
After tightening hub bolts (1) when replacing the tire, travel for 5 to
6 km, tighten the bolts again to settle all the contacting parts.
In particular, there are more contacting parts on the rear wheels
than on the front wheels, so it will take time for the parts to settle.
For this reason, repeat the tightening process during the first 50
hours after installation.
4 - 36
.
MAINTENANCE
SERVICE PROCEDURE
ADJUST PARKING BRAKE
WARNING
When carrying out the adjustment, raise the air pressure high enough to prevent the parking brake from being applied
automatically, and hang a warning sign on the parking brake valve lever to prevent any other person from operating it.
Never put any oil or grease on the surface of the pad or disc.
If the parking brake effect is poor, adjust as follows.
1. Check that the brake oil pressure caution lamp is turned OFF
(the brake accumulator pressure is sufficiently high), and then
release the parking brake.
2. Turn bolt (1) counterclockwise and bring in the pad into tight
contact with the disc.
3. Turn bolt (1) clockwise by 240° ± 15°(turn by 2/3 turn).
Measure the thickness of the pad, and if it is less than 1.5 mm (0.06
in), contact your Komatsu distributor to have it replaced.
When making an adjustment for the first time after replacing the
pads, turn bolt (1) counterclockwise by 360° ± 15°(turn by full 1
turn).
After adjusting, check the braking capacity of the parking brake.
See "CHECK BRAKING CAPACITY OF PARKING BRAKE
(PAGE 4-51)". If the machine moves, contact your Komatsu
distributor for inspection.
4 - 37
.
MAINTENANCE
SERVICE PROCEDURE
CLEAN HYDRAULIC TANK STRAINER
WARNING
The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the
temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
1. Raise the front side of the cab. For details, see "CAB TILT OPERATION (PAGE 3-107)".
2. Turn the cap of oil filler (F) to release the internal pressure
before removing the cap.
3. Remove cap (1) of the hydraulic tank strainer and clean the
strainer and strainer case.
4. After checking and cleaning, set the strainer in the case and
tighten cap (1).
5. Install the cap of oil filler (F).
4 - 38
.
MAINTENANCE
SERVICE PROCEDURE
CHECK BEFORE STARTING
For details of the following items, see "CHECK BEFORE STARTING (PAGE 3-72)".
Check coolant level, add coolant
Check dust indicator
Check oil level in engine oil pan, add oil
Check oil level in transmission case, add oil
Check oil level in hydraulic tank, add oil
Drain water, sediment from fuel tank
Check fuel level, add fuel
Check wheel hub bolts, tighten
Check central warning lamp, alarm buzzer, monitor lamps and meters
Check braking effect
Check manual emergency steering
Check auto-emergency steering
Check backup alarm
Check electric wiring
Check inflation pressure of tires
Check water separator
Does body positioner operate normally?
Are the cab mounting bolts and pins are free from looseness and breakage?
4 - 39
.
SERVICE PROCEDURE
MAINTENANCE
EVERY 50 HOURS SERVICE
LUBRICATION
1. Stop the engine.
2. Use the grease pump to pump in grease through the grease fitting marked by the arrow.
3. Check visually that the greasing has been carried out properly.
4. After greasing, wipe off any old grease that was pushed out.
Carry out the greasing operation every day when operating in places where the grease flows out easily, such as
when traveling through mud or water.
(1) Front suspension (left) (2 places)
(2) Front suspension (right) (2 places)
(3) Rear suspension (left and right: 2 places each)
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MAINTENANCE
SERVICE PROCEDURE
EVERY 250 HOURS SERVICE
Maintenance for every 50 hours service should be carried out at the same time.
LUBRICATION
1. Stop the engine.
2. Using a grease pump, pump in grease through the grease fittings shown by arrows.
3. Check visually that the greasing has been carried out properly.
4. After greasing, wipe off any old grease that was pushed out.
Carry out the greasing operation every day when operating in places where the grease flows out easily, such as
when traveling through mud or water.
(1) Steering cylinder (left) (2 places)
(2) Steering cylinder (right) (2 places)
(3) Hoist cylinder (left and right: 2 places each)
4 - 41
.
SERVICE PROCEDURE
(4) Body hinge pin (2 places)
(5) Hitch bearing (2 place)
4 - 42
MAINTENANCE
.
MAINTENANCE
SERVICE PROCEDURE
CHECK DRIVE SHAFT
If there is any problem, such as looseness of the drive shaft
connection, play in the spline or bearing portion, or runout of the
shaft, please contact your Komatsu distributor for repair.
4 - 43
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MAINTENANCE
SERVICE PROCEDURE
CLEAN OVERFLOW HOSE
WARNING
If compressed air scattered around dust and debris, there is danger of injury. Always wear protective equipment such as
protective glasses and mask.
The overflow hoses are installed to the front and center wheels. Remove and clean all of the 4 hoses.
1. Remove overflow hose (1).
2. After removing the tube, use compressed air to blow out the soil and dirt from the tube.
3. Install overflow hose (1).
Front
Center
4 - 44
.
MAINTENANCE
SERVICE PROCEDURE
CHECK LEVEL OF BATTERY ELECTROLYTE
Carry out this procedure before operating the machine.
WARNING
Do not use the battery if the battery electrolyte level is below the LOWER LEVEL line. This will accelerate deterioration of the
inside of the battery and reduce the service life of the battery. In addition, it may cause an explosion.
The battery generates flammable gas and there is danger of explosion, do not bring fire or sparks near the battery.
Battery electrolyte is dangerous. If it gets in your eyes or on your skin, wash it off with a large amount of water and consult a
doctor.
When adding distilled water to the battery, do not allow the battery electrolyte to go above the UPPER LEVEL line. If the
electrolyte level is too high, it may leak and cause damage to the paint surface or corrode other parts.
NOTICE
If there is a fear that the battery water may freeze after refilling with purified water (e.g. commercially available replenishment water
for a battery), do the replenishment before the day's work on the next day.
Inspect the battery electrolyte level at least once a month and follow the basic safety procedures given below.
WHEN CHECKING ELECTROLYTE LEVEL FROM SIDE OF BATTERY
If it is possible to check the electrolyte level from the side of the battery, check as follows.
1. Use a wet cloth to clean the area around the electrolyte level
lines and check that the electrolyte level is between the
UPPER LEVEL (U.L.) and LOWER LEVEL (L.L.) lines.
If the battery is wiped with a dry cloth, static electricity may
cause a fire or explosion.
2. If the electrolyte level is below the midway point between the
U.L and L.L lines, remove cap (1) and add distilled water to the
U.L line.
3. After adding distilled water, tighten cap (1) securely.
REMARK
If distilled water is added to above the U.L. line, use a syringe to
lower the level to the U.L. line. Neutralize the removed fluid with
baking soda (sodium bicarbonate), then flush it away with a large
amount of water or consult your Komatsu distributor or battery
maker.
4 - 45
.
SERVICE PROCEDURE
MAINTENANCE
WHEN IT IS IMPOSSIBLE TO CHECK ELECTROLYTE LEVEL FROM SIDE OF BATTERY
If it is impossible to check the electrolyte level from the side of the battery, or there is no display of the UPPER
LEVEL line on the side of the battery, check as follows.
1. Remove cap (1) at the top of the battery, look through the water
filler port, and check the electrolyte surface. If the electrolyte
does not reach the sleeve, add distilled water so that the level
reaches the bottom of the sleeve (UPPER LEVEL line) without
fail.
Use the diagram below for reference, and check if the electrolyte reaches the bottom of the sleeve.
2. After adding distilled water, tighten cap (1) securely.
REMARK
If water is added to above the bottom tip of the sleeve, use a pipette to remove electrolyte. Neutralize the removed
electrolyte with sodium bicarbonate, then flush it away with a large amount of water. If necessary, contact your
Komatsu distributor or your battery maker.
WHEN IT IS POSSIBLE TO USE INDICATOR TO CHECK ELECTROLYTE LEVEL
If it is possible to use an indicator to check the electrolyte level, follow the instructions given.
4 - 46
.
MAINTENANCE
SERVICE PROCEDURE
CHECK FAN BELT AND ALTERNATOR BELT TENSION, ADJUST
CHECKING
The deflection should be approx. 13 to 16 mm (0.51 to 0.63 in)
when the belt is pressed at a point midway between the fan pulley
and alternator pulley with a finger pressure of approx. 58.8 N (6 kg).
ADJUSTING
1. Loosen bolts and nuts (1), (2) and (3), then turn nut (4) to adjust
the tension of the belt.
2. After adjusting, tighten bolts and nuts (1), (2) and (3) to secure
alternator (5).
REMARK
Check each pulley for breakage and wear of the V-groove. In particular, check that the V-belt does not touch the
bottom of the V-groove.
If any abnormality is found, ask your Komatsu distributor for replacement of the pulley.
If the V-belt is so lengthened that it cannot be adjusted any more or if it has any cuts or cracks, replace it.
If the V-belt has been replaced with a new part, there will be initial elongation, so inspect and adjust it again after
one-hour of operation.
Be careful not to tighten the belt too much.
4 - 47
.
SERVICE PROCEDURE
MAINTENANCE
CHECK AIR CONDITIONER COMPRESSOR BELT TENSION, ADJUST
CHECKING
Press the middle of the belt between the air conditioner
compressor pulley (1) and drive pulley (2) with the thumb (about
58.8 N {6 kg}).
If deflection (A) is 10 mm, the belt tension is normal.
ADJUSTING
1. Loosen bolt (1).
2. Turn nut (2) to adjust so that the belt deflects approx. 10 mm
(0.4 in) when pressed with the thumb at a point midway
between the air compressor pulley and drive pulley with a force
of approx. 58.8 N (6 kg).
3. Tighten bolt (1) and nut (2) to secure the compressor in
position.
4. Check each pulley for damage, wear of the V-groove, and wear
of the V-belt. In particular, be sure to check that the V-belt is not
touching the bottom of the V-groove.
5. If the V-belt is so lengthened that it cannot be adjusted any
more or if it has any cuts or cracks, replace it.
6. If the V-belt has been replaced with a new part, there will be initial elongation, so adjust the belt again after
operating for 2 to 3 days.
4 - 48
.
MAINTENANCE
SERVICE PROCEDURE
CHECK FRAME, A-ARM
WARNING
When carrying out inspection of the machine with the dump body raised, always set the dump lever to the HOLD position, lock
with the dump lever lock knob, then use the body pivot pin.
1. Wash the frame and A-frame to make it easier to check.
2. Check all parts of the frame and A-frame for damage.
In particular, check the hatched portions in the diagram, and if
any cracks or damage are found, repair the damage.
Please contact your Komatsu distributor for details of the repair
procedure.
4 - 49
.
MAINTENANCE
SERVICE PROCEDURE
CHECK BRAKING CAPACITY OF FOOT BRAKE
WARNING
If the machine moves, it will lead to serious injury. If machine begins to move during the inspection of braking capacity, lower the
engine speed immediately, set shift lever at N position, and then set parking brake switch at PARKING position.
Check the braking capacity of the foot brake as follows.
1. Stop the machine on flat ground and depress service brake (1).
2. Set shift lever (2) to the D position, gradually raise the engine
speed. If the machine does not move even when the engine
speed reaches 1440 rpm, it is normal.
3. Lower the engine speed, set shifting lever at N position, and
then set parking brake at PARKING position.
If any abnormality is found, ask your Komatsu distributor for
repair.
NOTICE
There is danger of damage inside the transmission, so always do this with the shift lever at the "D" position. Do not use any other
position.
CHECK BRAKING CAPACITY OF RETARDER BRAKE
WARNING
If the machine moves, it will lead to serious injury. If machine begins to move during the inspection of braking capacity, lower the
engine speed immediately, set shifting lever at N position, and then depress the foot brake.
Check the braking capacity of the retarder brake as follows.
1. Stop the machine on flat ground and pull retarder control lever
(1) fully.
2. Set shift lever (2) to the D position, gradually raise the engine
speed. If the machine does not move even when the engine
speed reaches 1440 rpm, it is normal.
3. Lower the engine speed, set gear shift lever at N position. If
any problem is found, ask your Komatsu distributor for repair.
NOTICE
There is danger of damage inside the transmission, so always do this with the shift lever at the "D" position. Do not use any other
position.
4 - 50
.
MAINTENANCE
SERVICE PROCEDURE
CHECK BRAKING CAPACITY OF PARKING BRAKE
WARNING
If the machine moves, it will lead to serious injury. If machine begins to move during the inspection of braking capacity, lower the
engine speed immediately, set shifting lever at N position, and then depress the foot brake.
Check the braking capacity of the parking brake as follows.
1. Stop the machine on flat ground and set parking brake switch
(1) to PARKING.
2. Set shift lever (2) to the D position, gradually raise the engine
speed. If the machine does not move even when the engine
speed reaches 1490 rpm, it is normal.
3. Lower the engine speed, set gear shift lever at N position. If
any problem is found, ask your Komatsu distributor for repair.
NOTICE
There is danger of damage inside the transmission, so always do this with the shift lever at the "D" position. Do not use any other
position.
CHECK WEAR OF PARKING BRAKE PADS
WARNING
Never put any oil or grease on the surface of the pad or disc.
Measure the thickness of the pad, and if it is less than 1.5 mm (0.06
in), contact your Komatsu distributor.
4 - 51
.
SERVICE PROCEDURE
MAINTENANCE
CHECK OF ACCUMULATOR GAS PRESSURE
For handling of the accumulator, see "HANDLING SUSPENSION CYLINDER, ACCUMULATOR (PAGE 2-33)".
REMARK
If the engine stops during travel, the brake can be operated with the oil pressure in the accumulator temporarily.
CHECK OF FUNCTION
1. Stop the machine on a flat place and set the parking brake switch to the PARKING position.
2. Start the engine and run it at medium speed for 1 minute, and then stop it.
3. Turn the starting switch to the ON position and depress the brake pedal several times. After the brake pedal is
depressed some times, the brake oil pressure caution lamp lights up.
If the brake oil pressure caution lamp lights up when the brake pedal is depressed 4 times or less, the gas
pressure in the accumulator may be low. Ask your Komatsu distributor for inspection.
If the brake oil pressure caution lamp does not light up when the brake pedal is depressed 5 times, the gas
pressure in the accumulator is normal.
REMARK
Check the function within 5 minutes after stopping the engine. If the engine is kept stopped, the gas pressure in the
accumulator lowers and cannot be checked.
4 - 52
.
MAINTENANCE
SERVICE PROCEDURE
EVERY 500 HOURS SERVICE
Maintenance for every 50 and 250 hours service should be carried out at the same time.
CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE
WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause burns. Wait for the temperature to go down
before starting the work.
Refill capacity: 37 liters (9.78 US gal)
Prepare a filter wrench
1. Remove the bolts and cover (1).
2. Place a drain oil container just under the drain valve.
3. Remove drain plug (2), then loosen drain valve (3) slowly to
avoid getting oil on yourself, and drain the oil. Be careful not to
loosen the drain valve too far and deform the stopper pin inside
the valve.
4. Check the drained oil, and if there are excessive metal
particles or foreign material, please contact your Komatsu
distributor.
5. Tighten drain valve (3) and drain plug (2).
Tighten both of drain plug (2) and drain valve (3) to 68.6 ±
9.8 Nm {7 ± 1 kgm, 50.6 ± 7.2 lbft}.
6. Using the filter wrench, turn filter cartridge (4) to the left to
remove it.
When doing this, to prevent getting oil on yourself, do not carry
out this operation from immediately under the cartridge.
In particular, if this operation is carried out immediately after
stopping the engine, a large amount of oil will come out, so wait
for 10 minutes before starting the operation.
7. Clean the filter holder, fill the new filter cartridge with oil, coat
the packing face and thread with oil (or coat thinly with grease),
then install the filter cartridge.
8. Install the filter cartridge. When doing this, be careful not to damage the outside cylinder of the cartridge.
When installing the filter cartridge, tighten until the packing face is in contact with the filter holder, then tighten
a further 3/4 to 1 turn.
9. Pour in the specified amount of engine oil from oil filler (F).
10. Run the engine for a short time at idle, then check the oil if it is filled up to a specified level. For details, see
"CHECK OIL LEVEL IN ENGINE OIL PAN, ADD OIL (PAGE 3-74)".
4 - 53
.
MAINTENANCE
SERVICE PROCEDURE
REPLACE FUEL PREFILTER CARTRIDGE
WARNING
After the engine has been operated, all parts are at high temperature, so do not replace the filter immediately. Wait for all parts
to cool down before starting the operation.
High pressure is generated inside the engine fuel piping system when the engine is running.
When replacing the filter, wait for at least 30 seconds after stopping the engine to let the internal pressure go down before
replacing the filter.
Do not bring any fire or flame close.
NOTICE
Genuine Komatsu fuel filter cartridges use a special filter that has highly efficient filtering ability. When replacing the filter
cartridge, always use a genuine Komatsu part.
The common rail fuel injection system used on this machine consists of more precise parts than the conventional injection
pump and nozzle.
If any part other than a genuine Komatsu filter cartridge is used, dust or dirt may get in and cause problems with the injection
system. Always avoid using substitute parts.
When carrying out inspection or maintenance of the fuel system, pay more attention than normal to the entry of dirt. If dirt is
stuck to any part, use fuel to wash it off completely.
Container to catch the oil
Prepare a filter wrench
1. Set an oil receiving container under the fuel prefilter cartridge.
2. Turn water separator cup (2) installed to the bottom of filter
cartridge (1) to the left and remove it. (Use this cup again.)
3. Using a filter wrench, turn filter cartridge (1) counterclockwise
to remove it.
4. Install cup (2) removed before to the underside of the new fuel
prefilter cartridge. (At this time, be sure to replace the O-ring
with new one.)
Tightening torque of cup: 10 Nm {1.0 kgm, 7.2 lbft}
5. Clean the filter holder.
NOTICE
When filling the filter cartridge with fuel, carry out the filling operation with
cap (A) fitted.
Cap (A) acts to prevent the entry of dirt or dust into the filter cartridge.
6. Fill the filter cartridge with clean fuel through the 8 small holes
(B) in the new filter cartridge.
7. Coat the packing surface of the filter cartridge with oil.
8. Remove filter cartridge cap (A) and install to the filter holder.
4 - 54
.
MAINTENANCE
SERVICE PROCEDURE
9. When installing, tighten until the packing surface contacts the seal surface of the filter holder, then tighten it 3/4
of a turn.
If the filter cartridge is tightened too far, the packing will be damaged and this will lead to leakage of fuel. If the
filter cartridge is too loose, fuel will also leak from the packing, so always tighten the correct amount.
When tightening with a filter wrench, be extremely careful not to dent or damage the filter.
10. Check that the drain plug at the bottom of the water separator cup is tightened securely.
Tightening torque: 0.2 to 0.45 Nm (0.02 to 0.046 kgm, 0.1 to 0.3 lbft)
11. After replacing the fuel main filter cartridge (at intervals of 1,000 hours), bleed air. For details, see "REPLACE
FUEL MAIN FILTER CARTRIDGE (PAGE 4-60)". Do not add fuel to the fuel main filter cartridge, however.
12. Start the engine, check that there is no leakage of fuel from the filter seal surface or water separator mounting
surface, then run for approx. 10 minutes at low idling.
LUBRICATE CAB MOUNT PIN (LEFT AND RIGHT: 1 PLACE EACH)
1. Stop the engine.
2. Using a grease pump, pump in grease through the grease
fittings shown by arrows.
3. After greasing, wipe off any old grease that was pushed out.
Carry out the greasing operation every day when operating in
places where the grease flows out easily, such as when
traveling through mud or water.
CHECK OIL LEVEL IN FINAL DRIVE CASE, ADD OIL
WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause serious burns. Wait for the temperature
to go down before starting the operation.
If there is still pressure remaining inside the case, the oil or plug may fly out. Turn the plug slowly to release the pressure, then
remove it carefully.
1. Stop the machine so that the TOP casting mark is at the top
and drain plug (P) is at the bottom.
2. Remove plug (G) and check that the oil level is near the bottom
of the plug hole.
3. If the oil level is too low, add oil through the plug hole until the
oil overflows.
4. Repeat the procedure in Steps 1 - 3 and check the oil level and
add oil to all the final drive cases (front, center, rear).
4 - 55
.
MAINTENANCE
SERVICE PROCEDURE
CHECK OIL LEVEL IN DIFFERENTIAL CASE, ADD OIL
WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause burns.Wait for the temperature to go down
before starting the work.
When removing the plug, oil may spurt out, so turn the plug slowly to release the internal pressure, then remove it carefully.
1. Remove plug (G) and check that the oil level is near the bottom of the plug hole.
2. If the oil level in the front differential case is low, add oil through oil filler port (F) until oil overflows from the plug
hole.
3. If the oil level in the center or rear differential case is low, add oil through the plug hole until oil overflows from
the plug hole.
Front
Center
4 - 56
.
MAINTENANCE
SERVICE PROCEDURE
Rear
CLEAN, CHECK RADIATOR FINS AND AFTER COOLER FINS
WARNING
If compressed air scattered around dust and debris, there is danger of injury. Always wear protective equipment such as
protective glasses and mask.
If the radiator fins become clogged or bent, this may cause
overheating of the engine, so always clean or carry out inspection
and take the necessary actions.
Cleaning can be carried out by using jets of air, steam, or water,
but be careful not to let the nozzle contact the fin.
When using compressed air or steam, keep the nozzle at a right
angle to the radiator and after cooler.
Examine the rubber hose, and if any cracks or brittle places are
found, replace the hose. In addition, check also for loose hose
clamps.
NOTICE
If steam jet nozzle (1) is brought too close to fins (2), the fins can be
damaged, so keep a good distance in between when cleaning.
Use the following values as a benchmark.
Jet pressure: Lower than 9.8 MPa (100 kg/cm2)
Nozzle diameter: Less than 2 mm (0.08 in)
Distance between nozzle and fin (A): More than 100 mm (4 in)
4 - 57
.
SERVICE PROCEDURE
MAINTENANCE
RECOVER OIL LEAKING FROM FLOATING SEAL
There are 4 oil suction openings. Collect all oil with the hand pump
attached to the machine.
REMARK
If oil is flowing out of the overflow hose, collect the oil, even if before
500 hours.
1. Remove the cap of an oil suction opening.
2. Connect the coupler (female) of the attached hand pump to the coupler (male) of the suction opening.
3. Put the oil outlet hose of the hand pump in the oil receiving container.
4. Operate the hand pump at least 10 times to pump up the oil.
Front axle (left)
Front axle (right)
4 - 58
.
MAINTENANCE
SERVICE PROCEDURE
Center axle (left, right)
4 - 59
.
MAINTENANCE
SERVICE PROCEDURE
EVERY 1000 HOURS SERVICE
Maintenance for every 50, 250 and 500 hours should be carried out at the same time.
REPLACE FUEL MAIN FILTER CARTRIDGE
WARNING
After the engine has been operated, all parts are at high temperature, so do not replace the filter immediately. Wait for all parts
to cool down before starting the operation.
High pressure is generated inside the engine fuel piping system when the engine is running.
When replacing the filter, wait for at least 30 seconds after stopping the engine to let the internal pressure go down before
replacing the filter.
Do not bring any fire or flame close.
NOTICE
Genuine Komatsu fuel filter cartridges use a special filter that has highly efficient filtering ability. When replacing the filter
cartridge, always use a genuine Komatsu part.
The common rail fuel injection system used on this machine consists of more precise parts than the conventional injection
pump and nozzle.
If any part other than a genuine Komatsu filter cartridge is used, dust or dirt may get in and cause problems with the injection
system. Always avoid using substitute parts.
When carrying out inspection or maintenance of the fuel system, pay more attention than normal to the entry of dirt. If dirt is
stuck to any part, use fuel to wash it off completely.
Prepare a filter wrench
After replacing the fuel pre-filter cartridge, replace the fuel main filter cartridge.
1. Set the container to catch the fuel under the filter cartridge.
2. Using a filter wrench, turn filter cartridge (1) counterclockwise
on remove it.
3. Clean the filter holder, coat the packing surface of the new filter
cartridge thinly with oil, then install the filter cartridge to the filter
holder.
NOTICE
Do not add fuel to the fuel main filter cartridge.
4. When installing, tighten until the packing surface contacts the seal surface of the filter holder, then tighten it 3/4
of a turn.
If the filter cartridge is tightened too far, the packing will be damaged and this will lead to leakage of fuel. If the
filter cartridge is too loose, fuel will also leak from the packing, so always tighten the correct amount.
When tightening with a filter wrench, be extremely careful not to dent or damage the filter.
5. After replacing filter cartridge (1), loosen air bleed plug (2).
Do not loosen the plug at the filter stand of the fuel prefilter. If it is loosened, air is not bled.
6. Fill the fuel tank with fuel.
4 - 60
.
MAINTENANCE
SERVICE PROCEDURE
7. Loosen wing bolt (4) which is fixing lever (5) of priming pump
(3). Move lever (5) up and down to let fuel flow out of air
bleeding plug (2) until bubbles do not come out any more.
8. Tighten air bleeding plug (2) and then tighten wing bolt (4) of
priming pump (3) securely to lock lever (5).
Tightening torque for air bleeding plug
7.8 to 9.8Nm{0.8 to 1kgm}
Tightening torque for wing screw
6.9 to 12.7Nm{0.7 to 1.3kgm}
9. After replacing the filter cartridge, start the engine and check
that there is no leakage of fuel from the filter seal surface. If
there is any leakage of fuel, check the tightening of the filter
cartridge. If there is still leakage of fuel, follow Step 1 and 2 to
remove the filter cartridge, then check the packing surface for
damage or foreign material. If any damage or foreign material
is found in the packing, replace the cartridge with a new part,
then repeat Steps 3 - 9 to install the filter cartridge.
REPLACE CORROSION RESISTOR CARTRIDGE
WARNING
All the engine parts are at high temperature after the engine has been operated, so never replace the cartridge immediately after
finishing operations.
Wait for the oil to cool down before replacing the cartridge.
Prepare a filter wrench
1. Turn valve (1) at the top of the corrosion resistor to close it.
2. Set the container to catch the water under the cartridge.
3. Using a filter wrench, remove cartridge (2).
4. Clean the filter holder, coat the steel surface of the new filter
cartridge with clean engine oil, then install it.
5. When installing, tighten until the gasket contacts the seal
surface of the filter holder, then tighten a further 2/3 turns.
If the filter cartridge is tightened too far, the gasket will be
damaged and this will lead to leakage of water. If the filter is too
loose, water will also leak from the gap at the gasket, so always
tighten the correct amount.
6. Turn valve (1) to open it.
7. After replacing the cartridge, start the engine and check that there is no leakage of water from the filter seal
surface. If there is any leakage of water, check the tightening of the filter cartridge.
4 - 61
.
MAINTENANCE
SERVICE PROCEDURE
REPLACE TRANSMISSION FILTER ELEMENT
WARNING
The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the
temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
VALVE SIDE
Prepare a filter wrench
1. Set the container to catch the oil under the filter case.
2. Remove drain plug (1) at the filter head, drain the oil, then
tighten the plug again.
3. Using a filter wrench, turn filter cartridge (2) to the left to remove
it.
4. Clean the filter head, coat the seal surface of the new filter
cartridge thinly with clean oil, then install it.
Tightening torque: 49 to 59 Nm (5 to 6 kgm, 36.2 to 43.4 lbft)
5. Add oil. For details, see "CHECK OIL LEVEL IN TRANSMISSION CASE, ADD OIL (PAGE 3-75)".
BRAKE COOLING SIDE
1. Remove bolt (1), then remove cover (2).
2. Set the container to catch the oil directly under the drain plug
(P).
Remove drain plug (P), drain the oil, then tighten the plug
again.
3. Take out the element, then clean the inside of the case, the
strainer at the bottom of the case, and the removed parts.
4. Install the new element, then install cover (2) with bolt (1).
5. Add oil. For details, see "CHECK OIL LEVEL IN
TRANSMISSION CASE, ADD OIL (PAGE 3-75)".
6. Remove the cap installed to bleeder screw (3), then insert a
vinyl hose. Prepare a container with oil in it and insert the other
end of the hose approx. 50 mm (2.0 in) below the surface of the
oil. (Use any commercially available vinyl hose.)
7. Start the engine, loosen bleeder screw (3) approx. 3/4 turns,
and keep the engine running at idling until fewer bubbles come
out from the vinyl hose.
8. Tighten bleeder screw (3) properly, then install the cap.
9. Check that the oil level in the transmission case is up to the
specified level.
10. Add oil if the level is low.
REMARK
When the air is bled from inside the case, the transmission oil level becomes stable.
4 - 62
.
MAINTENANCE
SERVICE PROCEDURE
CHANGE OIL IN TRANSMISSION CASE
WARNING
The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the
temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
Refill capacity: 77.5 liters (20.48 US gal) (including oil in the brake oil tank and each filter case)
Carry out the following items at the same time in order to drain oil completely.
REPLACE TRANSMISSION FILTER ELEMENT (PAGE 4-62)
CHANGE OIL IN TRANSMISSION CASE (PAGE 4-63)
CHANGE OIL IN BRAKE OIL TANK, REPLACE BRAKE OIL FILTER ELEMENT (PAGE 4-65)
1. Set the container to catch the oil directly under the drain plug
(P).
Remove 2 drain plugs (P), drain the oil, then tighten the plug
again.
REMARK
When changing oil in the brake oil tank and replacing the brake
filter element, carry out steps 1 to 5 mentioned in "CHANGE OIL IN
BRAKE OIL TANK, REPLACE BRAKE OIL FILTER ELEMENT
(PAGE 4-65)".
NOTICE
Do not start up the engine without the transmission being filled with oil. If
the engine is started up while the transmission is empty or short of oil, the
transmission hydraulic pump will suffer damage.
2. Before starting the engine, add 80 liters (21.14 US gal) of oil
through oil filler port (F).
When oil is added, the level will temporarily go above the oil
level on sight gauge (G), but this does not indicate any
abnormality.
3. Start the engine and run at low idling.
4. Add oil through oil filler port (F) until the oil level is between the
H and L marks on sight gauge (G).
4 - 63
.
SERVICE PROCEDURE
MAINTENANCE
Make sure that the oil level in the brake oil tank does not go down below the mark in the sight gauge (H) while the
engine is running at low idling. If the oil level goes down below (H) mark, stop the engine and raise the oil level in
the brake oil tank.
5. Remove the cap from bleeder screw (1) and insert a vinyl hose.
(Use a commercially available vinyl hose.)
6. Put the other end of the vinyl hose approx. 50 mm into a
container of oil.
7. Loosen bleeder screw (1) approx. 3/4 turns and run the engine
at low idling until no more bubbles come out from the vinyl
hose.
8. When no more bubbles come out, tighten bleeder screw (1)
securely, remove the vinyl hose, then install the cap.
9. Carry out the warming-up operation of the engine until the torque converter oil temperature gauge goes above
40°.
10. When the torque converter oil temperature gauge rises to 40°, bleed the air from the brakes.
Front brake:See "BLEED AIR FROM FRONT BRAKE (PAGE 4-32)".
Center brake:See "BLEED AIR FROM CENTER BRAKE (PAGE 4-33)".
NOTICE
Do not attempt to use the oil drained during air bleeding again. Such a practice can cause damage on the machine's tool and
equipment.
Make sure that the oil level in the brake oil tank does not go down below (H) level in the sight gauge during air bleeding. If it
does, the brake oil pump could be damaged.
11. After finishing air bleeding, stop the engine (for 2 to 3 minutes), and adjust the oil level so that it reaches the
specified level. For details, see "CHECK OIL LEVEL IN TRANSMISSION CASE, ADD OIL (PAGE 3-75)".
4 - 64
.
MAINTENANCE
SERVICE PROCEDURE
CHANGE OIL IN BRAKE OIL TANK, REPLACE BRAKE OIL FILTER ELEMENT
WARNING
The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the
temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
Prepare a filter wrench
Refill capacity: 77.5 liters (20.48 US gal) (including oil in the transmission case and each filter case)
Carry out the following items at the same time in order to drain oil completely.
REPLACE TRANSMISSION FILTER ELEMENT (PAGE 4-62)
CHANGE OIL IN TRANSMISSION CASE (PAGE 4-63)
CHANGE OIL IN BRAKE OIL TANK, REPLACE BRAKE OIL FILTER ELEMENT (PAGE 4-65)
1. Depress the brake pedal at least 20 times to reduce the pressure inside the brake control accumulator to 0.
2. Set the container to catch the oil directly under drain plug (P).
Remove drain plug (P), drain the oil, then tighten the plug
again.
3. Set a container to catch the oil immediately under the filter case
(1), then remove filter case (1).
4. Take out the element and wash the inside of the filter case.
Replace O-ring (2) and backup ring (3) on the filter case with
new parts, coat thinly with clean oil, then install.
5. Assemble a new element in the filter case, coat the O-ring of
the element thinly with clean oil, then install.
Tightening torque: 78.4 to 98 Nm
{8 to 10 kgm, 57.9 to 72.3 lbft}
4 - 65
.
SERVICE PROCEDURE
MAINTENANCE
REMARK
Steps 6 to 8 are identical with those in "CHANGE OIL IN
TRANSMISSION CASE (PAGE 4-63)".
NOTICE
Do not start up the engine without the transmission being filled with oil. If
the engine is started up while the transmission is empty or short of oil, the
transmission hydraulic pump will suffer damage.
6. Before starting the engine, add 80 liters (21.14 US gal) of oil through oil filler port (F).
When oil is added, the level will temporarily go above the oil level on sight gauge (G), but this does not indicate
any abnormality.
7. Start the engine and run at low idling.
8. Add oil through oil filler port (F) until the oil level is between the H and L marks on sight gauge (G).
Make sure that the oil level in the brake oil tank does not go down below the mark in the sight gauge (H) while
the engine is running at low idling. If the oil level goes down below (H) mark, stop the engine and raise the oil
level in the brake oil tank.
REMARK
Steps 9 through 11 are identical with those in "CHANGE OIL IN TRANSMISSION CASE (PAGE 4-63)".
9. Carry out the warming-up operation of the engine until the torque converter oil temperature gauge goes above
40°.
10. When the torque converter oil temperature gauge rises to 40°, bleed the air from the brakes.
Front brake:See "BLEED AIR FROM FRONT BRAKE (PAGE 4-32)".
Center brake:See "BLEED AIR FROM CENTER BRAKE (PAGE 4-33)".
NOTICE
Do not attempt to use the oil drained during air bleeding again. Such a practice can cause damage on the machine's tool and
equipment.
Make sure that the oil level in the brake oil tank does not go down below (H) level in the sight gauge during air bleeding. If it
does, the brake oil pump could be damaged.
4 - 66
.
MAINTENANCE
SERVICE PROCEDURE
11. After finishing air bleeding, stop the engine (for 2 to 3 minutes), and adjust the oil level so that it reaches the
specified level. For details, see "CHECK OIL LEVEL IN TRANSMISSION CASE, ADD OIL (PAGE 3-75)".
4 - 67
.
SERVICE PROCEDURE
MAINTENANCE
LUBRICATION
1. Using a grease pump, pump in grease through grease fittings marked by arrows.
2. After greasing, wipe off any old grease that was pushed out.
Carry out the greasing operation every day when operating in places where the grease flows out easily, such as
when traveling through mud or water.
(1) Transmission front mount (1 place)
(2) Transmission rear mount (1 place)
(3) Center hinge pin (2 places)
(4) Parking brake (3 places)
4 - 68
.
MAINTENANCE
SERVICE PROCEDURE
CHECK WEAR OF BRAKE DISC
WARNING
Carry out this check when the brake oil temperature is below 60°C (140°F).
If the disc wear approaches the wear limit, check the condition frequently, regardless of the maintenance interval. In addition,
check the retarder capacity carefully.
1. Stop the machine on level ground, set the parking brake switch to the PARKING position, then check that the
other brakes are not applied before starting inspection.
2. Turn the starting switch ON and check that the retarder oil pressure caution lamp is out.
If the retarder oil pressure caution lamp is lighted up, start the engine, run the engine at 2000 rpm, and if the lamp
goes out, turn the starting switch OFF.
3. Remove cap nut (1).
4. Depress the brake pedal, keep it depressed, and push in the
rod (2) of the gauge until contacts the piston.
5. If mark (3) at position "A" of rod (2) enters beyond guide end
face (4), it means that the disc has reached the wear limit.
For the front brake, use the mark at position "A", and for the
center brake, use the mark at position "B".
If the disc has reached the wear limit, please contact your
Komatsu distributor for inspection and maintenance.
6. Tighten cap nut (1) removed in Step 3.
Tightening torque: 14.7 to 19.6 Nm
(1.5 to 2.0 kgm, 10.8 to 14.5 lbft)
REMARK
With new machines, the position of the guide is adjusted so that mark (5) comes to end face (4) of the guide, so
do not loosen locknut (6) except when replacing the disc.
Carry out the operation with two workers. One worker depresses the brake pedal and the other pushes in the
rod.
If the rod is pushed in when the engine is running, the rod will be pushed back by the brake cooling oil pressure,
so always carry out this operation with the engine stopped.
There are marks on the rod at three places (A, B, C), but for the front brake, use the mark at position "A", and for
the center brake, use the mark at position "B".
4 - 69
.
SERVICE PROCEDURE
MAINTENANCE
CHECK OF ENGINE AIR INTAKE PIPING CLAMPS FOR LOOSENESS
Check the clamps between the air cleaner, turbocharger, aftercooler, and engine for looseness. If any clamp is
loosened, retighten it.
Tightening torque of clamp (1): 8.8 ± 0.5 Nm {0.9 ± 0.05 kgm, 6.5 ± 0.4 lbft}
Tightening torque of clamp (2): 9.8 ± 0.5 Nm {1.0 ± 0.05 kgm, 7.2 ± 0.4 lbft}
4 - 70
.
MAINTENANCE
SERVICE PROCEDURE
EVERY 2000 HOURS SERVICE
Maintenance for every 50, 250, 500 and 1000 hours service should be carried out at the same time.
CHANGE OIL IN FINAL DRIVE CASE
WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause serious burns. Wait for the temperature
to go down before starting the operation.
If there is still pressure remaining inside the case, the oil or plug may fly out. Turn the plug slowly to release the pressure, then
remove it carefully.
Refill capacity: Front left, right 4.0 liters (1.06 US gal) each
Center left, right 3.5 liters (0.92 US gal) each
Rear left, right 4.5 liters (1.19 US gal) each
1. Stop the machine so that the TOP casting mark is at the top
and drain plug (P) is at the bottom.
2. Remove drain plug (P), drain the oil, then tighten the plug
again.
3. Add oil through the hole for plug (G) to the specified level.
4. After adding oil, check that the oil is at the specified level. See
"CHECK OIL LEVEL IN FINAL DRIVE CASE, ADD OIL
(PAGE 4-55)".
5. Repeat the procedure in Steps 1 - 4 and change the oil to all the
final drive cases (front, center, rear).
4 - 71
.
MAINTENANCE
SERVICE PROCEDURE
CHANGE OIL IN DIFFERENTIAL CASE
WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause serious burns. Wait for the temperature
to go down before starting the operation.
If there is still pressure remaining inside the case, the oil or plug may fly out. Turn the plug slowly to release the pressure, then
remove it carefully.
Refill capacity: Front 14.0 liters (3.70 US gal)
Center 24.5 liters (6.47 US gal)
Rear 25.0 liters (6.61 US gal)
1. Remove drain plug (P), drain the oil, then tighten the plug again.
2. Add oil to the specified level through the hole for plug (G) or oil filler port (F).
3. After adding oil, check that the oil is at the specified level. See "CHECK OIL LEVEL IN DIFFERENTIAL CASE,
ADD OIL (PAGE 4-56)".
4. Repeat the procedure in Steps 1 - 3 and change the oil to all the differential cases (front, center, rear).
Front
Center
4 - 72
.
MAINTENANCE
SERVICE PROCEDURE
Rear
REPLACE HYDRAULIC FILTER ELEMENT
WARNING
The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the
temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
1. Remove bolt (1), then remove cover (2).
2. Turn the cap of oil filler (F) slowly to release the internal
pressure, then remove the cap.
3. Remove bolts (3), then remove cover (4).
4. Take out the element, then wash the inside of the case and the
removed parts.
5. Install the new element, then install cover (4) with bolts (3).
6. Install cover (2) with bolts (1).
4 - 73
.
MAINTENANCE
SERVICE PROCEDURE
CLEAN TRANSMISSION CASE STRAINER
WARNING
The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the
temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
Drain the oil from the transmission case before starting the operation. For details, see Section "CHANGE OIL IN
TRANSMISSION CASE (PAGE 4-63)".
1. Remove bolt (1), then remove cover (2) and take out the
strainer.
2. Remove any dirt stuck to the strainer, then wash in clean diesel
fuel or flushing oil. If the strainer is damaged, replace it.
3. Install the strainers in their original position.
CLEAN BREATHER
WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause serious burns. Wait for the temperature
to go down before cleaning the engine breather.
When using compressed air, there is a hazard that dirt may be blown up and cause serious injury.
Always use safety glasses, dust mask, or other protective equipment.
Remove the mud and dirt from around the breather, then remove the breather and wash out the dirt from inside with
clean diesel oil or flushing oil.
Transmission
4 - 74
.
MAINTENANCE
SERVICE PROCEDURE
Hydraulic tank
Differential case (front)
Differential case (center)
Differential case (rear)
Final drive case (front, left)
4 - 75
.
SERVICE PROCEDURE
MAINTENANCE
Final drive case (front, right)
Final drive case (canter)
CHECK ACCUMULATOR GAS PRESSURE
Please contact your Komatsu distributor to have the gas pressure checked when making periodically replacement
of safety parts or carrying out the legally required 2000 hour or every year service.
CHECK ALTERNATOR
There is the possibility that the brush has worn out, or the bearing has run short of grease, so call on your Komatsu
distributor for an inspection or repairs.
CHECK, ADJUST ENGINE VALVE CLEARANCE
Special tools are needed for inspection and maintenance, so contact your Komatsu distributor.
CHECK VIBRATION DAMPER
Check that there are no cracks or peeling in the outside surface of the rubber.
If any cracks or peeling are found, contact your Komatsu distributor to have the parts replaced.
4 - 76
.
MAINTENANCE
SERVICE PROCEDURE
EVERY 4000 HOURS SERVICE
Maintenance for every 50, 250, 500, 1000 and 2000 hours service should be carried out at the same time.
CHANGE OIL IN HYDRAULIC TANK
WARNING
The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the
temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
Refill capacity: 120 liters (31.70 US gal)
1. Lower the dump body and stop the engine.
2. Turn the cap of oil filler (F) to release the internal pressure
before removing the cap.
3. Taking care not to get any oil on you, remove drain plug (P),
drain the oil, then tighten the plug again.
4. Pour in the specified amount of engine oil from oil filler (F).
5. After adding oil, check that the oil is at the specified level. For
details of the oil to use, see "CHECK OIL LEVEL IN
HYDRAULIC TANK, ADD OIL (PAGE 3-75)".
CHECK STARTING MOTOR
The brush may be worn or have no grease on the bearing, so contact your Komatsu distributor for inspection or
repair.
If the engine is started frequently, carry out inspection every 1000 hours.
CHECK WATER PUMP
Check around the water pump for water leakage. If any part is leaking, ask your Komatsu distributor for
inspection/repair.
CHECK AIR COMPRESSOR
Ask your Komatsu distributor to carry out this work.
CHECK FAN PULLEY AND TENSION PULLEY
Check for play of the pulley and leakage of grease. If any problem is found, please contact your Komatsu distributor.
4 - 77
.
SERVICE PROCEDURE
MAINTENANCE
CHECKING FOR LOOSENESS OF HIGH-PRESSURE CLAMP, HARDENING OF RUBBER
Check visually and touch with your fingers to check that there are no loose bolts or hardening of rubber parts at
clamps (1) to (14). If there is any looseness or hardened rubber, contact your Komatsu distributor for replacement.
CHECKING FOR MISSING FUEL SPRAY PREVENTION CAP, HARDENING OF RUBBER
Check for any missing fuel spray prevention caps (1) to (11) or fuel spray prevention cover (12), and check also for
any hardened rubber portions. If there are any missing caps or cover or the rubber is hardened, please contact your
Komatsu distributor for repairs.
4 - 78
.
MAINTENANCE
SERVICE PROCEDURE
EVERY 6000 HOURS SERVICE
Maintenance for every 50, 250, 500, 1000, 2000 and 4000 hours service should be carried out at the same time.
LUBRICATE DRIVE SHAFT
When greasing, use lithium grease (G2-LI), and carry out the
greasing every 6000 hours or every 2 years.
1. Using a grease pump, pump in grease through the grease
fittings marked by the arrows.
2. Grease the spider portion until grease comes out from the cap
seal.
3. After greasing, wipe off any old grease that was pushed out.
4 - 79
.
SERVICE PROCEDURE
MAINTENANCE
EVERY 8000 HOURS SERVICE
Maintenance for every 50, 250, 500, 1000, 2000, 4000 and 6000 hours service should be carried out at the same
time.
REPLACE HIGH-PRESSURE PIPING CLAMP
Ask your Komatsu distributor to carry out this work.
REPLACE FUEL SPRAY PREVENTION CAP
Ask your Komatsu distributor to carry out this work.
OVERHAUL STARTING MOTOR AND ALTERNATOR
Ask your Komatsu distributor to carry out this work.
4 - 80
.
5-1
.
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
Item
Unit
HM300-2
Overall weight
(unladen weight + max. payload + 1 operator (75kg (165 lb))
kg (lb)
51415 (113370)
Unladen weight
kg (lb)
24040 (53008)
kg (lb)
27300 (60197)
Max. payload
3
12.9 (16.9)
3
m (cu.yd)
16.6 (21.7)
sec
12
–
Komatsu SAA6D125E-5
diesel engine
kW (HP)/rpm
254 (340)/2000
Max. torque
Nm (kgm,
lbft)/rpm
1706 (174, 1258)/1400
A Overall length
mm (ft in)
10440 (34' 3'')
B Overall height
mm (ft in)
3520 (11' 7")
C Overall height when dumping
mm (ft in)
6430 (21' 1")
D Overall width
mm (ft in)
2900 (9' 6")
E Min. ground clearance (bottom of rear axle)
mm (ft in)
510 (1' 8")
mm (ft in)
7960 (26' 1")
1st
km/h (MPH)
6.8 (4.2)
2nd
km/h (MPH)
10.7 (6.6)
3rd
km/h (MPH)
16.2 (10.1)
4th
km/h (MPH)
25.5 (15.8)
5th
km/h (MPH)
38.4 (23.9)
6th
km/h (MPH)
58.6 (36.4)
1st
km/h (MPH)
7.6 (4.7)
2nd
km/h (MPH)
18.1 (11.2)
°C (°F)
-20 to 40°C (-4 to 104°F)
Dump body capacity
Struck
m (cu.yd)
Heaped (2 : 1)
Dumping speed (at 2000 rpm) (raised)
Name of engine
Flywheel horsepower
Min. turning radius
Forward
Travel speed
Reverse
Temperature range when using
5-2
.
6-1
.
HANDLING AUTOMATIC RETARDER, ACCELERATOR CONTROL(ARAC)
ATTACHMENTS, OPTIONS
HANDLING AUTOMATIC RETARDER, ACCELERATOR
CONTROL(ARAC)
This is a system to automatically activate the retarder when an operator wants to use it on a downslope or slow down
on a flat hauling road. It enables the retarder to automatically function according to the present selected gear speed
and engine revolution, thus making it easier for an operator to use the retarder.
WARNING
The ARAC system begins to function when the automatic retarder, accelerator control switch is in the ON position. Check that
this switch is turned on before running down on a slope.
The ARAC system may not assure thorough braking force to slow down, depending on a slope inclination, load weight and
selected gear speed. In that case, use the retarder control lever and brake pedal to slow down to a safety speed.
The tires may be locked when the dump truck is running on a slippery hauling road and the ARAC system is in service. If that
happens, stop using the ARAC system.
Should some anomaly happen on the ARAC system and disable an operator from secure control of the dump truck, the system
is put in the OFF condition and released, while the alarm buzzer sounds. In that case, keep control of the dump truck, using the
retarder control lever and brake pedal, bring the truck to a halt in a safe place and turn off the automatic retarder, accelerator
control switch.
EXPLANATION OF COMPONENTS
(1)
(2)
(3)
6-2
Automatic retarder, accelerator control switch
Retarder control lever
Accelerator pedal
(4)
(5)
Brake pedal
Retarder pilot lamp
.
ATTACHMENTS, OPTIONS
HANDLING AUTOMATIC RETARDER, ACCELERATOR CONTROL(ARAC)
AUTOMATIC RETARDER, ACCELERATOR CONTROL SWITCH
This switch (1) is used to turn on and off the ARAC system.
(A): The ARAC system begins to function when a travel speed is
over 7 km/h and the accelerator pedal is released, and the
retarder pilot lamp lights on. (In a lower range of engine
revolution, the retarder pilot lamp may not light on even though
the ARAC system is in service.)
(B): The ARAC system does not function.
RETARDER CONTROL LEVER
This lever (2) activates the retarder even while the ARAC system is in service.
REMARK
When the ARAC system is in service, the retarder control lever has some play. It does not mean that the retarder
does not work, but that the ARAC system is in service.
ACCELERATOR PEDAL
The ARAC system functions only while accelerator pedal (3) is released.
BRAKE PEDAL
This pedal (4) can activate the wheel brakes even while the ARAC system is in service.
RETARDER PILOT LAMP
This lamp (5) lights on when the ARAC system begins to function and when the retarder is operated with the retarder
control lever.
METHOD OF OPERATION
ACTUATION OF ARAC SYSTEM
The ARAC system begins to function when the automatic retarder, accelerator control switch is turned to the ON
position.
When the automatic retarder, accelerator control switch is turned to the ON position, the retarder automatically
works according to the present gear speed selected and engine revolution.
If the brake pedal is depressed while the ARAC system is in service, the system stops functioning, accelerating the
truck's travel speed.
If the brake pedal is depressed, or the retarder control lever is used, while the ARAC system is in service, then the
dump truck can be slowed down or brought to a halt just as in normal braking operation.
6-3
.
ATTACHMENTS, OPTIONS
USE OF REAR VIEW MONITOR
USE OF REAR VIEW MONITOR
WARNING
Never operate any of the switches while in running. If you do so, there is the fear that you may make an error in the truck
operation, or neglect to watch the hauling road ahead for safety, and as a result cause a serious personal injury.
The rear view monitor is an aid for checking obstacles in the rear. An image appearing on the monitor is limited. So when
backing up the dump truck, be sure to make a visual check, not relying solely on the monitor.
An image on the rear view monitor does not show an actual distance, so drive the dump truck slowly, when backing it up.
When the dump truck is backed up and the rear view monitor is set in operation, a monitor display enables the driver
to check the rear for safety.
NAME AND FUNCTON OF EACH PART OF REAR VIEW MONITOR
(1) Auto Switch
(2) Manual Switch
(3) Zoom / Iris Switch (Reverse Light Compensation
Switch)
(4)
(5)
(6)
(7)
Bright / Dim Light Selector Switch
Mark Switch (not operable with this machine)
Contrast Adjustment Knob
Brightness Adjustment Knob
AUTO SWITCH
When an image of a camera is shown on the monitor display and
this switch (1) is pressed, the camera image disappears and the
display turns into a waiting condition.
When the gearshift lever is put into the "R" position while the
display is in the waiting condition, an image of the rear view
automatically appears.
6-4
.
ATTACHMENTS, OPTIONS
USE OF REAR VIEW MONITOR
MANUAL SWITCH
When this switch (2) is pressed, an image of a camera appears on
the monitor display.
At that time, a mark "CAM1" appears on the upper left side of the
display and a figure "5" on the upper right side of the display.
REMARK
When the manual switch is pressed to call an image and the
operation is suspended thereafter, the image disappears in
approx. 5 minutes, turning the display into a waiting condition.
This is a function in case the operator forgets to switch off the
display (timer function).
The time until the monitor display is automatically switched off
is shown on the upper right side of the display. It changes by
minute and in the descending order as 5→4 →3 → 2 → 1.
Moreover, when the remaining time comes down to just 10
seconds before the monitor display goes off, the last figure "1"
on the upper right side begins to flash.
When the manual switch is pressed to call an image and it is
pressed again while the image is shown on the monitor display,
it remains on the display for approx. 5 more minutes from the
moment the switch is pressed.
When the gearshift lever is in the "R" position, the timer function
does not work.
ZOOM/IRIS SWITCH (REVERSE LIGHT COMPENSATION SWITCH)
Zoom Function (press the switch)
By pressing this switch (3), an image on the monitor display can be
enlarged by 1.4 times.
At that time, a mark of "ZOOM" is shown on the upper right side of
the display.
When the switch is pressed again, "ZOOM" disappears and the
display returns to the original image.
Iris Function (Reverse Light Compensation Function) (Keep the switch pressed for more than 1 second.)
WARNING
When the iris function is activated (turned "ON"), the whole monitor display becomes brighter. As a result, some portion on the
display becomes difficult to read or discern, while it is easy to do so with the iris function turned "OFF". Therefore do not use this
function except when it is necessary to read or see a dim portion.
When it is difficult to see a monitor display due to a reverse light, keep this switch (3) for more than 1 second, and
then the iris function (reverse light compensation function) is turned "ON", turning the display brighter and making
it easier to see.
At that time, a mark of "IRIS" appears on the upper left side of the display.
If the switch is further kept pressed for more than 1 second, the iris function (reverse light compensation function)
is turned "OFF" and "IRIS" mark goes off.
6-5
.
USE OF REAR VIEW MONITOR
BRIGHT/DIM LIGHT SELECTOR SWITCH
When this switch is pressed, the brightness of the monitor display
lowers.
A mark of "DIM" appears on the upper left side of the display then.
When the switch is pressed again, the brightness returns to the
original level, and "DIM" mark goes off.
MARK SWITCH
The shown mark position does not correspond with the machine.
Do not use this function.
CONTRAST ADJUSTMENT KNOB
With this knob (6), contrast on the monitor display can be adjusted
to be either stronger or weaker.
To side (A): Contrast becomes stronger.
To side (B): Contrast becomes weaker.
BRIGHTNESS ADJUSTMENT KNOB
With this knob (7), brightness (luminance) on the monitor display
can be adjusted.
To side (A): Brightness increases.
To side (B): Brightness decreases.
6-6
ATTACHMENTS, OPTIONS
.
ATTACHMENTS, OPTIONS
USE OF REAR VIEW MONITOR
SETTING OF REAR VIEW MONITOR
HOW TO SET DISPLAY MODE
A mark of "CAM1", "DIM", "IRIS" and "ZOOM" appears on the upper left side of the monitor display, depending on
the sort of ongoing operation.
Every mark is set to go off in approx. 2 seconds after it lights up (2- second display mode).
The display can be changed to a constantly lighted condition by the following method (continuous display mode).
1. Press mark switch (2) while pressing manual switch (1) at the
same time.
A "Cam1" mark lights up on the upper left side of the monitor
display, and the display mode changes to the continuous
display mode.
2. When it is required to return to the 2- second display mode,
press mark switch (2), while pressing manual switch (1) at the
same time, the same way as in step 1 above.
After a "Cam1" mark remains lighted for approx. 2 seconds on
the upper left side of the monitor display, only the mark
disappears, and the display mode changes to the 2- second
display mode.
REMARK
In either case of the 2- second display mode and continuous display mode, the display remains lighted all the time
in the remaining time after the mark goes off and before the monitor display goes off, too.
CAUTIONS WHEN USING REAR VIEW MONITOR
WARNING
Do not attempt to disassemble or modify the monitor. There is a danger of electric shock or fire.
Do not attempt to open the monitor backside cover. There is a danger of electric shock, as high voltage power is conducted
internally.
Do not use the monitor if it is suspected of defect. There is a fear of electric shock or fire, should it be used in spite of a defect.
In that case, ask your Komatsu distributor for repair or replacement.
In case a foreign material has got into the monitor or it gets wet, or if a smoke comes out of the monitor or it gives a bad smell,
stop the use immediately. It poses a big danger to use the monitor when any such abnormality exists. In that case, consult your
Komatsu distributor.
When replacing a fuse, be sure to use one with the specified capacity of 3A. Should a fuse with a higher- than- specified
capacity be used, it can cause fire.
As a general rule, this product should be replaced after a total usage time of approximately 3000 hours (or
approximately 3 years), though this may differ according to usage conditions.
When cleaning the monitor, use dry soft cloth or wet cloth after having well wrung the water out.
If it is very dirty, use neutral detergent. Do not use thinner or alcohol.
Sometimes an image on the monitor display is blurred due to the camera lens being smeared. In that case, clean
the camera lens with dry soft cloth or wet cloth after having well wrung the water out.
6-7
.
HANDLING DUMPING COUNTER
ATTACHMENTS, OPTIONS
HANDLING DUMPING COUNTER
The dumping counter is an automatic counting function to count
the number of loads that have been dumped.
The number of loads dumped is displayed on the character
display.
METHOD OF DISPLAYING, RESETTING DUMPING COUNTER
1. Check that the character display is showing the service meter/odometer, or the action code. If it is giving any
other display, turn the starting switch OFF, then turn the starting switch to the ON position and wait for the above
display to be given.
2. Press ( ) of machine monitor mode selector switch 1. The
character display shows the dumping counter.
3. When resetting the number of loads dumped, press ( ) of
machine monitor mode selector switch 1. The display shows
the screen on the right.
4. Press ( ) of machine monitor mode selector switch 1. The
number of loads dumped is reset and the display returns to the
previous screen.
To abandon the resetting operation, press („) of machine
monitor mode selector switch 1 to return to the previous
screen.
5. When completing the operation, press („) of machine monitor
mode selector switch 1 or turn the starting switch OFF.
6-8
.
ATTACHMENTS, OPTIONS
HANDLING MACHINES EQUIPPED WITH KOMTRAX
HANDLING MACHINES EQUIPPED WITH KOMTRAX
KOMTRAX is a machine management system that uses wireless communications.
A contract with your Komatsu distributor is necessary before the KOMTRAX system can be used. Any customers
desiring to use the KOMTRAX system should consult their Komatsu distributor.
The KOMTRAX equipment is a wireless device using radio waves, so it is necessary to obtain authorization and
conform to the laws of the country or territory where the machine equipped with KOMTRAX is being used. Always
contact your Komatsu distributor before selling or exporting any machine equipped with KOMTRAX.
When selling or exporting the machine or at other times when your Komatsu distributor considers it necessary,
it may be necessary for your Komatsu distributor to remove the KOMTRAX equipment or to carry out action to
stop communications.
If you do not obey the above precautions, neither Komatsu nor your Komatsu distributor can take any
responsibility for any problem that is caused or for any loss that results.
BASIC PRECAUTIONS
WARNING
Never disassemble, repair, modify, or move the communications terminal, antenna, or cables. This may cause failure or fire
on the KOMTRAX equipment or the machine itself. (Your Komatsu distributor will carry out removal and installation of
KOMTRAX.)
Do not allow cables or cords to become caught; do not damage or pull cables or cords by force. Short circuits or disconnected
wires may cause failure or fire on the KOMTRAX equipment or the machine itself.
For anyone wearing a pacemaker, make sure that the communications antenna is at least 22 cm (8.7 in) from the pacemaker.
The radio waves may have an adverse effect on the operation of the pacemaker.
NOTICE
Even when the key in the starting switch of the KOMTRAX system is at the OFF position, a small amount of electric power is
consumed. When putting the machine into long-term storage, take the action given in "LONG-TERM STORAGE (PAGE 3-124)".
Please contact your Komatsu distributor before installing a top guard or other attachment that covers the cab roof.
Be careful not to get water on the communications terminal or wiring.
REMARK
The KOMTRAX system uses wireless communications, so it cannot be used inside tunnels, underground, inside
buildings, or in mountain areas where radio waves cannot be received. Even when the machine is outside, it
cannot be used in areas where the radio signal is weak or in areas outside the wireless communication service
area.
There is absolutely no need to inspect or operate the KOMTRAX communications terminal, but if any abnormality
is found, please consult your Komatsu distributor.
6-9
.
.
INDEX
INDEX
<A>
AIR CONDITIONER
ARTICULATE LOCK
3- 64
3- 45
<B>
BODY PIVOT PIN
3- 45
<C>
CAB TILT OPERATION
CAR RADIO
CAR STEREO
CHECK BEFORE STARTING ENGINE
CHECKS AFTER COMPLETION OF
WORK
CHECKS AFTER STOPPING ENGINE
CIRCUIT BREAKER
COLD WEATHER OPERATION
AFTER COLD WEATHER
PRECAUTIONS AFTER
COMPLETION OF WORK
PRECAUTIONS FOR LOW
TEMPERATURE
CONTROL LEVERS AND PEDALS
3-107
3- 50
3- 56
3- 70
3-112
3- 88
3- 46
3-121
3-123
3-122
3-121
3- 40
<D>
DETERMINING AND MAINTAINING
TRAVEL ROAD
DETERMINING TRAVEL ROAD
MAINTAINING TRAVEL ROAD
DUMP OPERATIONS
DUST INDICATOR
3-114
3-114
3-114
3-105
3- 46
<E>
EXPLANATION OF COMPONENTS
3-
<F>
FOREWORD
FUSES
1- 2
3- 47
<G>
GENERAL PRECAUTIONS
GENERAL VIEW
GENERAL VIEW OF CONTROLS AND
GAUGES
GENERAL VIEW OF MACHINE
GUIDES TO MAINTENANCE
5
2- 11
3- 2
334-
3
2
2
<H>
HANDLING AUTOMATIC RETARDER,
ACCELERATOR CONTROL(ARAC)
EXPLANATION OF COMPONENTS
METHOD OF OPERATION
HANDLING DUMPING COUNTER
HANDLING MACHINES EQUIPPED
WITH KOMTRAX
BASIC PRECAUTIONS
HANDLING OIL, FUEL, COOLANT, AND
PERFORMING OIL CLINIC
HANDLING TIRES
<I>
IF TRANSMISSION HAS TROUBLE
INTENDED USE
DIRECTIONS OF MACHINE
<L>
LOADING OPERATIONS
LOCATION OF FIRE EXTINGUISHER
LOCATION OF PLATES, TABLE TO
ENTER SERIAL NO. AND
DISTRIBUTOR
PRODUCT IDENTIFICATION
NUMBER (PIN)/MACHINE SERIAL
NO. PLATE
SERVICE METER POSITION
TABLE TO ENTER SERIAL NO. AND
DISTRIBUTOR
LOCKING
LONG-TERM STORAGE
AFTER STORAGE
BEFORE STORAGE
DURING STORAGE
PRECAUTIONS BEFORE
TRAVELING AFTER LONG-TERM
STORAGE
<M>
MACHINE MONITOR
MAINTENANCE SCHEDULE CHART
METHOD OF LIFTING MACHINE
METHOD OF LOWERING DUMP BODY
IN EMERGENCY
METHOD OF SECURING MACHINE
6666-
2
2
3
8
66-
9
9
4- 4
3-113
3-126
1- 7
1- 7
3-104
3- 46
1-
8
11-
8
9
1- 9
3-112
3-124
3-124
3-124
3-124
3-124
3- 5
4- 17
3-117
3-126
3-116
7-1
.
INDEX
MOVING MACHINE OFF (FORWARD,
REVERSE), STOPPING
<O>
OPERATION
OPERATION USING DIFFERENTIAL
LOCK
OPERATIONS, CHECKS AFTER
STARTING ENGINE
OTHER FUNCTIONS OF MACHINE
MONITOR
OUTLINE OF ELECTRIC SYSTEM
OUTLINE OF SERVICE
<P>
PARKING MACHINE
PERIODIC REPLACEMENT OF SAFETY
CRITICAL PARTS
PRECAUTIONS DURING OPERATION
BATTERY
OPERATION
STARTING ENGINE
TOWING
TRANSPORTATION
PRECAUTIONS FOR MAINTENANCE
PRECAUTIONS FOR OPERATION
PRECAUTIONS WHEN
TRANSPORTING
PRECAUTIONS WITH TIRES
<R>
RECOMMENDED FUEL, COOLANT,
AND LUBRICANT
RECOMMENDED BRANDS,
RECOMMENDED QUALITY FOR
PRODUCTS OTHER THAN
KOMATSU GENUINE OIL
USE OF FUEL, COOLANT AND
LUBRICANTS ACCORDING TO
AMBIENT TEMPERATURE
<S>
SAFETY
SAFETY CRITICAL PARTS
SAFETY INFORMATION
7-2
3- 89
3- 70
3-103
3- 87
3- 26
4- 8
4- 4
3-111
4- 15
2- 20
2- 27
2- 22
2- 20
2- 29
2- 26
2- 30
3-110
3-115
2- 37
4- 10
4- 12
4- 11
2- 2
4- 16
1- 5
SAFETY LABELS
SERVICE PROCEDURE
CHECK BEFORE STARTING
EVERY 1000 HOURS SERVICE
EVERY 2000 HOURS SERVICE
EVERY 250 HOURS SERVICE
EVERY 4000 HOURS SERVICE
EVERY 50 HOURS SERVICE
EVERY 500 HOURS SERVICE
EVERY 6000 HOURS SERVICE
EVERY 8000 HOURS SERVICE
INITIAL 250 HOURS SERVICE (ONLY
AFTER THE FIRST 250 HOURS)
WHEN REQUIRED
SHIFTING GEAR
SPECIFICATIONS
STANDARD TIGHTENING TORQUES
FOR BOLTS AND NUTS
STARTING ENGINE
STEERING THE MACHINE
STEPS FOR TRANSPORTATION
STOPPING ENGINE
SWITCHES
<T>
TORQUE LIST
TRANSPORTATION
TRAVELING DOWNHILL
TROUBLESHOOTING
AFTER RUNNING OUT OF FUEL
IF BATTERY IS DISCHARGED
METHOD OF TOWING MACHINE
OTHER TROUBLE
<U>
USE OF REAR VIEW MONITOR
CAUTIONS WHEN USING REAR
VIEW MONITOR
NAME AND FUNCTON OF EACH
PART OF REAR VIEW MONITOR
SETTING OF REAR VIEW MONITOR
<W>
WEAR PARTS
WEAR PARTS LIST
24444444444-
4
19
39
60
71
41
77
40
53
79
80
4- 19
4- 20
3- 94
5- 2
4- 13
3- 85
3-102
3-115
3- 88
3- 30
4- 13
3-115
3- 96
3-125
3-125
3-131
3-127
3-135
6-
4
6-
7
66-
4
7
44-
9
9
.
.
HM300-2 GALEO ARTICULATED DUMP TRUCK
Form No. PEN00101-04
©
2007 KOMATSU
All Rights Reserved
Printed in Japan 06-07
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