Honda UMK431 Owner Manual

HONDA
Grass / Weed Trimmer
UMK422 - UMK431
OWNER'S MANUAL
MANUEL DE L'UTILISATEUR
BEDIENUNGSANLIETUNG
Ki
FON DA.
UMK422/UMK431
OWNER’S MANUAL
a E mm mme --
"
=
i
t
1
I
L
1
CONTENTS
1. SAFETY INSTRUCTIONS -.ooooccoccononenonroncccnnanaconanonccanca naa roo ronanararanannon 3
2. SAFETY LABEL LOCATIONS. c..00cconncccncnnnnnconacaninonnonncanencnnocnanerannonanonns 14
GE mark location ........cccceeeceeccecceecceccesseserseccecseeeccnscnecesnesennerpereenssensans 17
3. COMPONENT IDENTIFICATION ..........u002240000 ans enBena nennen nenn nenne nennen 18
4. CONTROLS .........enacnensennnnennnnnnnnennnnnsansnnnnensnnnnnnnnnnnennennnenusansennannnrennnen 22
5. PRE-OPERATION CHEGKS cnmccocccccnccnnonnnancnnaronnononononnconannnnnnnnanzcanass 28
6. STARTING THE ENGINE 20... cece cece ce ee cc ee ccc ececessnesensaneeneeteeseeeeeens 40
7. TRIMMING OPERATION Q......ccc.c:ccccccceescceeeesseuseuseneescesesenscceressesoeeeeees 45
8. STOPPING THE ENGINE 00.0000... cece eee eee cece ces ce eeceesccees cree ceuseseeeeenens 48
9. MAINTENANCE ............... линии таяния ини ини ини нининия 50
10. ЭТОВАСЕ......... ина анальная ьи аира ни наи ванен вен ишиии нижние 69
11. TROUBLESHOOTING .......u.seneenssannnennnnnnnnnnnonnannennannennnn nenn nnnnnennn nenn 71
12. SPECIFICATIONS ¿00cccoccooonccncconanancnnnnnnacconanoncncnncno na ron ro rior ronnnrnnninanennas 72
13. MAJOR HONDA DISTRIBUTOR ADDRESSES IN EUROPE ............ 79
INTRODUCTION
Thank you for purchasing a Honda grass/weed trimmer.
This manual covers the operation and maintenance of the Honda GRASS/
WEED TRIMMER UMK422/UMK431.
Honda Motor Co., Ltd. reserves the right to make changes at any time without
notice and without incurring any obligation.
No part of this publication may be reproduced without written permission.
This manual should be considered a permanent part of the grass/weed
trimmer and should remain with it if it is resold.
Pay special attention to statements preceded by the following words;
Indicates a strong possibility of severe personal injury or
death if instructions are not followed.
CAUTION: Indicates a possibility of personal injury or equipment damage
if instructions are not followed.
NOTE: Gives helpful information.
lf a problem should arise, or if you have any questions about the grass/weed
trimmer, consult an authorized Honda dealer.
Honda grass/weed trimmers are designed to give safe and dependable
service if operated according to instructions.
Operating a grass/weed trimmer requires special effort to
ensure the safety of the operator and the safety of others. Read and
understand this Owner’s Manual before operating the grass/weed trimmer;
failure to do so could result in personal injury or equipment damage.
HONDA MOTOR CO. LTD. 2001, ALL RIGHTS RESERVED
+ The illustrations may vary according to the type.
A ——
1. SAFETY INSTRUCTIONS
di WARNING
To ensure safe operation
For your safety and safety of others, pay special attention to these precau-
tions:
и
=
Honda grass/weed trimmer Is designed to give safe and
dependable service if operated according to instructlons.
Read and understand the Owner’s Manual before operating
the grass/weed trimmer. Failure to do so could result in
personal injury or equipment damage.
y
a
Keep all persons and pets away from the grass/weed
trimmer operating area.
To prevent accidental contacts with the wheellng cutting
attachment (nylon-line cutting head, cutting blade or saw
blade) orthrown objects from the wheeling cutting attach-
ment, keep people and pets at least 15 m (50 ft.) away from
the grass/weed trimmer when it is in use.
/
N
Wear eye protection, helmet and other protective devices
to protect your eyes and body from all objects (gravel,
glass, wire, etc.) thrown by the wheeling cuttlng attach-
ment.
D
To ensure safe operation
Operator Responsibility
Any part from the machine is a potential source of danger if the machine
is used in abnormal conditions or if the maintenance is not done correctly.
Read the owner's manual carefully. Be familiar with the controls and their
proper use of the grass/weed trimmer. Know now to stop the engine rapidly,
and how to unhook a harnessed grass/weed trimmer quickly.
Use the grass/weed trimmer for the purpose itis intended for, thatis trimming.
Any other use could be dangerous or damage the grass/weed trimmer.
Do not use the grass/weed trimmer as a pruning hook.
Never allow children or people unfamiliar with this owner’s manual to use the
grassAveed trimmer. Local regulations may restrict the age of the operator.
If you lend or resell your grass/weed trimmer to a third person, instruct him
or her with how to handle the product and alert him or her to read the
Owner's Manual carefully before operation.
Never operate the grass/weed trimmer while:
— people, especially children or pets are nearby.
— user is fatigued or under medication, or has swallowed substances
known to affect judgement or reactions.
Keep people and pets at least 15 m (50 ft.) away from the operator during
operation. Note that an assistant to the operator should work at least 15 m
(50 ft.) away from the operator, too. We recommend to decide the engine
stop signal and other signals between the operator and assistant, and use
them for safety during operation.
Keep in mind that the operator or user is responsible for accidents or
hazards occurring to other people or their property.
To ensure safe operation
Operator Responsibility
While operating the grass/weed trimmer, always wear following protective
clothing and protective devices.
— Protective clothing
Wear adequate clothes with long sleeves and long pants.
The clothes must fit your body and button up or zip up the clothes
securely. Do not leave the sleeves and bottom of the shirt/jacket loose.
Wear the arm covers, too.
Do not wear the clothes with the tapes, laces and/or ribbons, loose
clothes, necktie, necklace, etc. during operation. They can be caughtin
the grass/weed trimmer or on the weed causing injury. Bind your hair if
itis long, and do not let your hair below your shoulder.
— Protective devices
*
Goggles
Wear the goggles or other eye protection to protect your eyes from
the debris that is thrown by the wheeling cutting attachment (nylon-
line cutting head, cutting blade or saw blade}.
Helmet
Wear the helmet to protect your head from the overhead branches
and the falling foreign material.
Face shield
Wear face shield to protect your face from the debris thrown by the
wheeling cutting attachment.
Ear muffs/ear plugs
Wear the ear muff, ear plugs or other hearing protection to protect
your ears from the noise.
Gloves
Wear the gloves to protect your hands.
= кон --—
To ensure safe operation
Operator Responsibility
« Safety boots
Wear the safety boots with the non-slip sole and toe protector to
protect your feet from the flying debris.
Do not operate the equipment when barefoot or wearing open
sandals.
Wear the leg protectors as well.
* Dust mask
We recommend that you wear the dust mask if you suffer from the
allergic rhinitis, e.g. pollinosis, etc. The dust mask is available at a
pharmacy and it is helpful for reducing the amount of pollens you
breathe.
GOGGLES HELMET
EAR MUFFS
CLOTHES
(LONG SLEEVE)
ARM COVER
GLOVES
CLOTHES
{LONG PANTS)
LEG PROTECTOR
SAFETY BOOTS
(WITH TOE PROTECTOR)
e Before each use, visually inspect the grass/weed trimmer including a
cutting attachment for any damage and looseness of fastening part.
+ Avoid operating the grass/weed trimmer at night or in abad weather of poor
visibility, because there is much possibility of accident.
Walk, never run during operation.
Avoid operating the grass/weed trimmer on a steep slope.
The steep slope is very slippery, so you can slip down.
AWARNING
To ensure safe operation
Operator Responsibility
Do not operate the grass/weed trimmer with the debris shield, labels, and
other parts removed.
Note that the debris shield is provided for protection of the operator from
the debris that are thrown from the wheeling cutting attachment (nylon-line
cutting head, cutting blade or saw blade). Never operate the grass/weed
trimmer with the debris shield removed or before installing the debris shield
in the proper position securely.
Do not mount an incorrect part and do not tamper with the grass/weed
trimmer as it can result in personal injury and/or equipment damage. Use
the cutting attachment that is designated for your model and application.
Do not change the engine governor settings or overspeed the engine.
Before cranking the engine, be sure to check the cutting attachment cannot
come into contact with the ground or any obstruction.
Start the engine carefully according to instructions and with hands and feet
well away from the cutting attachment.
Start the grass/weed trimmer on a level surface, free of high grass or
obstacle.
Do not raise the cutting attachment above your knee height during
operation. You can be hit by the debris thrown by the wheeling cutting
attachment in your eyes and face causing injury.
Never carry the grass/weed trimmer while the cutting attachment is turning.
Before you carry the grass/weed trimmer, be sure to stop the engine and
confirm the cutting attachment stops its turning. If a cutting or saw blade is
used, cover the blade with the protective plastic cover while carrying the
trimmer.
To ensure safe operation
Operator Responsibility
Stop the engine and disconnect the spark plug cap in the following cases:
— Before any operation around the cutting attachment (nylon-line cutting
head, cutting blade or saw blade).
— Before checking, cleaning or working on the grass/weed trimmer.
— After striking a foreign object. Inspect the grass/weed trimmer for
damage and make repairs before restarting and operating the grass/
weed trimmer again.
— If grass/weed trimmer starts to vibrate abnormally. Check immediately
the cause of the vibration and perform the necessary repair.
Stop the engine in the following caces:
— Whenever you leave the grass/weed trimmer unattended.
— Before refuelling.
— When any person or pet is approaching.
— Shut off the engine immediately when the grass/weed trimmer shows
abnormal vibration suddenly. Sudden vibration can suggest the dam-
aged rotating parts or loose fasteners. Examine the cause of the
problem, and do not start the engine before repair is made.
— When wires catch on the wheeling cutting attachment and flap around.
Remove the wires after the cutting attachment has stopped turning.
— Before placing the grass/weed trimmer on the ground, make sure the
cutting attachment stops turning as well.
Note that the cutting attachment is turning by inertia right after returning
the throttie trigger and while the engine ts idling.
The grass/weed trimmer is faulty when the engine is idling by returning the
throttle but the cutting attachment keeps turning, and idle speed adjust-
ment must be made. Consult your authorized Honda dealer.
Keep all nuts, bolts and screws tight to be sure the grass/weed trimmer is
In safe working condition. Regular maintenanceis an essential aid to user’s
safety and retaining a high level of performance.
Do notuse the grass/Aweed trimmer with worn or damaged parts. Parts must
be replaced, or repaired. Replace worn or damaged parts with HONDA
genuine parts. Non equivalent quality parts may damage the machine and
be prejudicial to your safety.
To ensure safe operation
Operator Responsibility
« Adjust the holding position of your grass/weed trimmer.
Be sure to adjust the holding position with the engine stopped. Adjust the
carrying harness so that the quick-release latch is positioned at your right
hip. Hook the grass/weed trimmer to the carrying harness. Adjust the
carrying harness length so that the cutting attachment is parallel to the
ground and stays above the ground keeping the clearance specified below.
Note that it might be hard to hold the grass/weed trimmer in the correct
position if you are very tall. Do not operate the grass/weed trimmer if the
cutting attachment is close to your feet when you hold the grass/weed
trimmer at the correct position.
e Check the balance of the grass/weed trimmer between its front and rear
sides for proper contro! and less fatigue.
Hold the grass/weed trimmer at the correct position as described above.
slacken your grip on the handle gradually. Do not release but put your
nands lightly on the handle and check that the cutting attachment-to-
ground clearance does not change large this time.
Balancing adjustment is necessary if the cutting attachment rises above
your knees. Do not operate the grass/weed trimmer without the balancing
adjustment.
Parallel to the ground and
0 - 30 cm (0 - 11.8 in.) for the nylon-line
(>t cutting head and 10 — 30 cm (3.9 — 11.8 in.) for
the cutting/saw blade clear of the ground.
GROUND
¢ Hold the grassAveed trimmer firmly with your both hands during operation
to keep the trimmer under control at all times.
9
СРР
AWARNING
To ensure safe operation
Operator Responsibility
e Injury caused by vibration and cold:
You may feel the prickling or burning pain in your fingers, and the fingers
may lose color and feeling depending on your constitution. It is believed
that these symptoms are brought by vibration and/or exposure to cold. The
specific trigger point of these symptoms are not identified yet, but observe
the following instructions.
* Limit the amount of time you spend operating the grass/weed trimmer
In a day.
A day’s work should consist of the work with the grass/weed trimmer and
the other work without the hand-held equipment so you can limit the
amount of time when your hands are exposed to the machine vibration.
* Keep your body warm, especially your hands, wrists and arms.
* Take your breaks at shorter intervals and arm exercises well to maintain
good blood circulation. Do not smoke while working.
+ When you feel discomfort, redness and swelling of the fingers followed
by whitening and loss of feeling, consult your doctor promptly.
e Injury caused by repeated operation:
Performing the repeated operation for a prolonged time may cause injury.
Observe the following instructions to reduce the causes of the injury.
« Avoid the repeated operation by using your wrist(s) in bent, stretched or
twisted position.
* Take your breaks regularly to minimize the effect of the repeated
operation. Take your time when performing the repeated operation. Do
not rush to operate the grass/weed trimmer.
+ When your fingers, hands, wrists and/or arms are throbbing or numbed,
consult your doctor.
10
= gs Á RKÁ —Á
.
To ensure safe operation
Child Safety
e Keepchildren indoors and supervised at all times any outdoor power grass/
weed trimmer is being used nearby. Young children move quickly and are
attracted especially to the grass/weed trimmer and trimming activity.
e Wever assume children will remain where you last saw them. Be alert and
turn the grass/weed trimmer off if children enter the area.
e Children should never be allowed to operate the grass/weed trimmer, even
under adult supervision.
Thrown Object Hazard
Objects hit by the wheeling cutting attachment (nylon-line cutting head, cutting
blade or saw blade) can be thrown from the grass/weed trimmer with great
force, and may cause serious injury.
e Thoroughly inspect the area where the grass/weed trimmer is to be used
and remove ali objects (stones, branches, wires, bones, etc...) which may
be thrown by the wheeling cutting attachment.
11
di WARNING
To ensure safe operation
Fire and Burn Hazard
Gasoline is extremely flammable, and gasoline vapor can explode.
Use extreme care when handling gasoline. Keep gasoline out of reach of
children.
Store fuel in containers specifically designed for this purpose.
Refuel outdoors only, and do not smoke while refuelling or handling fuel.
Add fuel before starting the enging. Never remove the cap of the fuel tank
or add petrol while the engine is running or when the engine is hot.
lf gasoline is spilled, do not attempt to start the engine but move the grass/
weed trimmer away from the area of spillage and avoid creating any source
of ignition until gasoline vapours have dissipated.
Tighten all fuel tanks and container caps securely.
When you start the engine after refueling, be sure to start the engine at least
3 m (3.2 ft.) away from the refueling spot.
Never store the grass/weed trimmer with gasoline in the tank inside a
building where fumes may reach an open flame, spark or high temperature
source.
Allow the engine to cool before storing in any enclosure.
To reduce the fire hazard, keep the grass/weed trimmer, especially the
engine, muffler, the gasoline storage area as well, free of grass, leaves, or
excessive grease.
Do not leave containers of vegetable matters in or near a building.
lf the fuel tank has to be drained, this should be done outdoors, with a cold
engine.
12
PO TO
To ensure safe operation
Carbon Monoxide Poisoning Hazard
Exhaust contains poisonous carbon monoxide, a colorless and odorless gas.
Breathing exhaust can cause loss of consciousness and may lead to death.
e Ifyou run the engine in an area that is confined or even partially enclosed,
the air you breathe could contain a dangerous amount of exhaust gas.
To keep exhaust gas from building up, provide adequate ventilation.
Replace faulty muffler.
Do not operate the engine in a confined space where dangerous carbon
monoxide fumes can collect.
13
eee ne
—— eee в а ва.
4
2. SAFETY LABEL LOCATIONS
Your grass/weed trimmer must be used with care. Therefore, decals have
been placed on the machine, to remind you pictorially of main precautions to
take during use. Their meanings are explained on page 3.
These decals are considered as a part of the grass/weed trimmer. Should one
become detached or unreadable, contact your Honda dealer for its
replacement.
LTE:
14
UE:
A DAKOO O
LE:
ADA ооо
—
15
16
ооо
800
CE mark location
4
1
Honda Europe Power Equipment S.A. .
Lwa || Rue des Chätaigniers - Péle 45
45140 ORMES - France
dB CE |
6.
Blade label
3
. conformity mark, according to the
89/392/CEE modified Directive
Model and type
Year of manufacture
Name and adresse of the manu-
facturer
Acoustic power level according to the
directive 2000/14/EC
Serial number
ES? 9200 min!
Maximum transmission shaft roration speed.
pa
ERA
The trimmer {8 to be operated with a nylon line
cutting head only.
LE & LEB:
Use the brush cutter with a nylon line type
cutting head or plastic or metal blades only,
| Do not use circular saw blades.
17
3. COMPONENT IDENTIFICATION
LTE:
GEAR CASE
NYLON-LINE
CUTTING HEAD
С
ASE
ARS HANGER
A ENGINE SWITCH
AD THROTTLE
PR TRIGGER
DEBRIS SHIELD A 4 INTERLOCK
Ê
LOOP HANDLE
THROTTLE
TRIGGER FRAME SERIAL NUMBER
ENGINE SERIAL NUMBER
— — ———
18
UE:
CUTTING BLADE
GEAR CASE
DEBRIS SHIELD THROTTLE ENGINE SWITCH
VA TRIGGER
«a #7
=< + THROTTLE
Cutter:
TRIGGER
La
IN | Y INTERLOCK
| HANGER
NYLON-LINE ye
CUTTING HEAD
Debris shleld: U-SHAPED HANDLE
FRAME SERIAL NUMBER
ENGINE SERIAL NUMBER
For nylon-line For saw blade
cutting head
LE:
CUTTING BLADE
GEAR CASE
LOOP HANDLE
ENGINE SWITCH
DEBRIS SHIELD LO HANGER
==
Cutter: THROTTLE
TRIGGER
7 INTERLOCK
к р
u
NYLON-LINE
CUTTING HEAD
PROTECTOR
Debris shleld:
THROTTLE
TRIGGER
FRAME SERIAL NUMBER
ENGINE SERIAL NUMBER
For nylon-line
cutting head
19
— -———a»
UEB:
CUTTING BLADE |
GEAR CASE ENGINE SWITCH
VA TRIGGER |
Xe Г
Cutter: SQ ff ROTO-STOP
E LEVER
a Xd
x р >
NYLON-LINE
CUTTING HEAD
Debris shield: U-SHAPED HANDLE
FRAME SERIAL NUMB.
ENGINE SERIAL NUMBER
For nylon-Ine For saw blade
cutting head
LEB:
CUTTING BLADE
GEAR CASE
DEBRIS SHIELD LOOP HANDLE
ENGINE SWITCH
Cutter: HANGER
ROTO-STOP
LEVER
NYLON-LINE
CUTTING HEAD PROTECTOR
Debris shield:
THROTTLE
TRIGGER FRAME SERIAL NUMI
ENGINE SERIAL NUMBER
For nylon-line
cutting head
20
SPARK PLUG CAP
CHOKE LEVER
AIR CLEANER
MUFFLER
PRIMING
PUMP
FUEL RETURN
ENGINE — TUBE (TRANSPARENT
SERIAL |
NUMBER )
II A
че О FUEL TUBE
\ (BLACK TUBE)
FUEL TANK CAP
STARTER GRIP
ENGINE OIL
FILLER CAP
21
4. CONTROLS
1. Engine switch
The engine switch enables and disables the ignition system.
The engine switch must be in the ON position for the engine to run.
Turning the engine switch to the OFF position stops the engine.
Loop handle type (LTE and LE):
ENGINE SWITCH
Loop handle type (LEB):
ENGINE SWITCH
22
U-shaped handle type (UE):
ENGINE SWITCH
U-shaped handle type (UEB):
ENGINE SWITCH
ОМ.........
23
2. Choke lever
The choke lever opens and closes the choke valve in the carburetor.
The CLOSED position enriches the fuel mixture for starting a cold engine.
The OPEN position provides the correct fuel mixture for operation after
starting, and for restarting a warm engine.
CHOKE LEVER
3. Starter grip
Pulling the starter grip operates the recoil starter to crank the engine.
STARTER GRIP
24
4. Throttle trigger (LTE, LE and UE)
The throttle trigger controls engine speed.
Pulling and releasing the throttle triqger shown below makes the engine run
faster or slower,
NOTE: The throttle trigger interlock
must be depressed before the throttle
trigger can be activated.
By pulling the throttle trigger gradually,
the engine speed increases and the
cutting attachment (nylon-line cutting
head, cutting blade or saw blade) starts
to run.
Pull the throttle trigger more to acceler-
ate the engine speed and the cutting
rotating speed.
By releasing the throttle trigger, the
engine speed decreases and the cut-
ting attachment keeps turning for a
while by inertia, then it stops.
Throitle trigger interlock:
The throttle trigger interlock makes the
throttle trigger operable. The throttle
trigger cannot be pulled unless the
throttle trigger interlock has been
pushed beforehand.
Idle-up Knob:
When it is hard to start the engine, the
idle-up knob helps the engine to start
(see page 44).
LTE and LE:
IDLE-UP KNOB
THROTTLE TRIGGER
INTERLOCK
THROTTLE SLOW
TRIGGER
UE:
THROTTLE TRIGGER
IDLE-UP
KNOB
THROTTLE
A, TRIGGER
INFERLOCK
25
Throttie trigger (LEB and UEB)
The throttie trigger controls engine speed.
Pressing and releasing the throttle trig- LEB:
ger makes the engine run faster or ROTO-STOP
slower. LEVER
NOTE: The roto-stop lever must be
depressed to unlock and operate the
throttle trigger.
By pulling the throttle trigger gradually,
the engine speed increases and the
cutting attachment (nylon-line cutting
head, cutting blade or saw blade) starts
to run.
Press the throttle trigger to reach the
cutting too! operating speed. THROTTLE
TRIGGER
By releasing only the throttle trigger,
the engine speed decreases and the
cutting attachment keeps turning for a
while by inertia, then it stops.
By releasing both throttle trigger and
roto-stop lever simultaneously, the en-
gine decreases to idle speed and the
cutting tool is stopped.
Roto-Stop lever: UEB:
The roto-sop lever has two functions: THROTTLE TRIGGER
1. Roto-stop lever unlocks the throttle
trigger.
Throttle trigger cannot be activated
without depressing the rotostop le-
ver.
2. Roto-stop lever stops the cutting too!
when released.
ROTO-STOP
LEVER
26
. Quick-release latch
The quick-release latch tab is provided to detach the grass/weed trimmer
from your body in an emergency.
Pullup the quick-release latch tab, and the grass/weed trimmer is detached
from the carrying harness.
QUICK-RELEASE LATCH TAB
Г` CARRYING HARNESS
QUICK-RELEASE LATCH
27
5. PRE-OPERATION CHECKS
For safe and efficient trimming, always make a pre-operation inspection
before operating:
Perform a pre-operation inspection on firm, level surface
with the engine stopped and spark plug cap removed from the spark
plug.
1. Check the engine oil level
CAUTION: Running the engine with fow oil level will cause serious
engine damage.
1. Place the grass/weed trimmer on a level surface and remove the oil filler
cap.
2. Check the oillevel: it should reach to the edge of the oil filler neck, and check
the engine oil for contamination and deterioration.
3. If the oil level is low, fill to the edge of the oil-filler neck with the recom-
mended oil.
If the oil is contaminated or deteriorated, replace it (see page 53).
4. Install the oil filler cap.
Every 10 hours, check the engine oil level and replenish oil up to the top of the
oil filler neck if the engine is operated for more than 10 hours continuously.
ENGINE OIL CAPACITY: 0.1 2 (0.11 US at, 0.09 Imp gt)
OIL FILLER NECK
UPPER OIL LIMIT
NT
Na L
ENGINE OIL FILLER CAP < VA LE
28
2
Fa]
o
Use Honda 4-stroke, or an equivalent high detergent, premium quality motor
oil certified to meet or exceed U.S. automobile manufacturer's requirements
for service classification SG, SF. Motor oils classified SG, SF will show this
designation on the container.
Select the appropriate viscosity for the average temperature in your area.
SAE Viscosity Grades
AMBIENT TEMPERATURE
CAUTION:
Using nondetergent oil or 2-stroke engine oil could shorten the engine's
service life,
The recommended operating range of this engine is —5°C to 40°C (23°F to
104°F).
29
2. Check the fuel level
Use automotive gasoline (Unleaded or lowleaded is preferred to minimize
combustion chamber deposits).
FOR NEW SOUTH WALES ONLY:
Use unleaded fuel only.
Never use an oil/gasoline mixture or dirty gasoline. Avoid getting dirt, dust or
water in the fuel tank.
A WARNING
Gasoline is extremely flammable and is explosive under certain
conditions.
Refuel in a well-ventilated area with the engine stopped. Do not
smoke or allow flames or sparks in the area where the engine is
refueled or where gasoline is stored.
Do not overfill the fuel tank (there should be no fuel in the filler neck).
After refueling, make sure the tank cap is closed properly and
securely.
Be careful not to spill fue] when refueling. Spilled fuel or fuel vapor
may ignite. If any fuel is spilled, make sure the area is dry before
starting the engine.
Avoid repeated or prolonged contact with skin or breathing of vapor.
KEEP OUT OF REACH OF CHILDREN.
CAUTION: Gasoline substitutes are not recommended; they may be
harmful to fuel system components.
30
A AAA A 5
1. Check the fuel level visually from the outside of the fuel tank while keeping
the fuel filler neck upright.
2. Ifthe fuel level is low, refuel the fuel tank until the level as specified. Remove
the fuel tank cap gradually to release a pressurized air in the fuel tank. Fuel
in the fuel tank may spout out, if the fuel tank cap is removed quickly.
FUEL TANK CAPACITY: UMK422: 0.45 £ (0.119 US gal, 0.099 Imp gal)
UMK431: 0.65 2 (0.172 US gal, 0.143 Imp gal)
FUEL TANK CAP
UPPER FUEL——»-
LEVEL
FUEL TANK
31
ee и ни
Gasolines containing alcohol
If you decide to use a gasoline containing alcohol (gasonol}, be sure it's octane
rating is at least as high as that recommended by Honda. There are two types
of “gasohol”: one containing ethanol, and the other containing methanol. Do
not use gasohol that contains more than 10% ethanol. Do not use gasoline
containing methanol (methyl or wood alcohol) that does not also contain
cosolvents and corrosion inhibitors for methano!. Never use gasoline contain-
ing more than 5% methanol, even if it has cosolvents and corrosion inhibitors.
NOTE:
e Fuel system damage or engine performance problems resulting from the
use of fuels that contain alcohol is not covered under the warranty.
Honda’ cannot endorse the use of fuels containing methanol since
evidence of their suitability is as yet incomplete.
e Before buying fuel from an unfamiliar station, try to find out if the fuel
contains alcohol, if it does, confirm the type and percentage of alcohol
used. If you notice any undersirable operating symptoms while using a
gasoline that contains alcohcl, or one thay you think contains alcohol,
switch to a gasoline that you know does not contain alcohol.
32
3. Check the air cleaner elements
CAUTION: Never run the engine without the air cleaner; rapid engine
wear will result.
1. Move the choke lever to the CLOSED (upwards) position.
2. Remove the air cleaner cover by unhooking the upper tab on the top of the
air cleaner cover and its two lower tabs.
3. Check the air cleaner element for dirt or obstruction.
Clean the air cleaner element, if it is dirty (see page 55).
4. Reinstall the air cleaner element.
9. Reinstall the air cleaner cover by inserting the lower tabs, then insert the
upper tab.
AIR CLEANER ELEMENT
CHOKE LEVER
AIR CLEANER COVER
UPPER TAB
LOWER TABS
33
4. Check the throttle cable free play
e Check the throttle cable free play at the tip of the cable by pulling and
releasing the throttle trigger a few times. It should be 1 — 3 mm (0.039 —
0.118 in.) at the tip of the throttle cable.
FIXING NUT
FREE PLAY:
1-3 mm
(0.039 — 0.118 in.)
ADJUSTING /
NUT k
TIP OF THE THROTTLE CABLE
lf the free play is not as specified above, adjust the free play (see page 64).
e Check the throttle trigger operates smoothly and always spring back to the
idle position.
5. Check the quick-release latch
—
. Put on the carrying harness.
2. Check the latch is released as soon as the quick-release latch tab is pulled
upwards while holding the hip pad (U-shaped handie type only) with your
left hand.
3. Insert the latch tongue in the slot of the quick-release latch to reattach the
trimmer to ithe carrying harness.
QUICK-RELEASE LATCH
QUICK-RELEASE
LATCH TAB
HIP PAD
(U-shaped handle type only)
_ the latch is not released, have your device inspected and repaired by your
servicing dealer.
34
6. Inspect the cutting attachment
Nylon-line cutting head inspection:
For safety, check the cutting head before starting the engine.
Operating the grass/weed trimmer with the loose, cracked, or other
damaged cutting head can cause a personal injury or equipment dam-
age. Thrown cutting head by loose fastening can hit the operator or
bystanders causing death or serious injury.
CAUTION: Wear heavy gloves to protect your hands, when you turn a
spool.
1. Stop the engine and remove the spark plug cap.
2. Check the cutting head for looseness.
Tighten the cutting head securely if it is loose (see page 56).
If it is hard to do it yourself, consult your authorized Honda dealer.
3. Check the nylon line for fluffing.
lf the nylon line is damaged, have the nylon line advance according to the
following procedures.
The nylon line advances when the cutting head is tapped against the ground
while the engine is running. A debris shield with cut-off knife must be used with
it.
$ ТАР
35
Blade inspection:
For safety, check the blade for wear and damage and check
the tightness of the blade nut before starting the engine. Operating the
grass/weed trimmer with a worn, cracked, or damaged blade can cause
a personal injury or equipment damage. A worn, cracked or damaged
blade can break and pieces of the damaged blade can hit the operator or
bystanders causing death or serious injury.
CAUTION: Wear heavy gloves to protect your hands, when working
around the blade.
1. Stop the engine and remove the spark plug cap.
2. Check the tightness of the blade nut.
Tighten the nut if it is loose (see page 58).
If it is hard to do it yourself, consult your authorized Honda dealer.
3. Check the blade for wear, bend, crack and other damage.
lf the blade is worn out, cracked, chipped, or otherwise damaged replace
the damaged blade with new one which is a genuine Honda replacement
blade or its equivalent (see page 58).
A dull blade can be sharpened.
If it is hard to do it yourself, consult your authorized Honda dealer.
Ina
NORMAL WORN
IN IN
BENT CRACKED
36
7. Inspect the debris shield
AWARNING
Never use the grass/weed trimmer without its debris shield. Stones
or other foreign objects thrown outward by the wheeling cutting
attachment (nylon-line cutting head, cutting blade or saw blade) or
contact with the wheeling cutting attachment could cause personal
injury or property damage.
Do not touch the line cut-off knife. Contact with it may hurt your
fingers.
. Inspect the debris shield to be sure that they are correctly installed and are
not damaged. If the debris shield is damaged, replace it before using the
grass/weed trimmer.
Check the debris shield mounting bolts for looseness.
Tighten the bolts securely, if necessary.
Nylon-line cutting head: Cutting/saw blade:
DEBRIS SHIELD DEBRIS SHIELD
MOUNTING BOLTS MOUNTING BOLTS
37
8. Check all bolts and nuts |
1. Gheck each bolt and nut for looseness. Tighten them securely if necessary.
2. Check the handle for loose mounting bolts or screws, and tighten them
securely if necessary.
UE: LE:
HANDLE MOUNTING
HANDLE MOUNTING BOLTS SCREWS
PROTECTOR MOUNTING
BOLTS AND NUTS
LOOP HANDLE
U-SHAPED HANDLE
UEB: | LEB:
HANDLE MOUNTING
BOLTS PROTECTOR MOUNTING MOUNTIN с
BOLTS AND NUTS
THROTTLE
LOOP HANDLE
U-SHAPED
HANDLE
LTE:
HANDLE MOUNTING
LOOP HANDLE SCREWS
THROTTLE
ASSY
38
9. Check the roto-stop lever (LEB and UEB)
1. Check that roto-stop lever:
+ has a full stroke between 29 ~ 33 mm (LEB), 35 ~ 39 mm (UEB) |
¢ always returns back to its starting point. |
+ operates smoothly and freely in the 3 following cases:
a. Squeeze the roto-stop lever and release it slowly.
b. With squeezing the roto-stop lever, pull the throttle trigger and
release only it slowly.
c. Squeeze the roto-stop lever and pull the throttle trigger, and
release them slowly at the same time.
lf something seems abnormal, have the grass/weed trimmer inspec-
ted and repaired by your authorised servicing dealer.
2. Check that the roto-stop lever free play is more than 3 mm.
lf the free play is not as specified above, have the grass/weed trimmer
inspected and repaired by your servicing dealer.
LEB: ROTO-STOP UEB:
LEVER
FREE PLAY
3mm (0.118 in)
or more
ROTO-STOP
LEVER
FREE PLAY
4mm (0.118 in)
or more
35 - 39 mm
10.Check the roto-stop system operation check (LEB and UEB)
To avoid severe personal Injury, disconnect the spark plug
cap to prevent accidental starting.
CAUTION: Wear heavy gloves to protect your hands, when handling the
cutting attachment.
Stop the engine and remove the spark plug cap. ]
Check that roto-stop system operates properly. i
Check that there is resistance difference of turning the cutting aitachment :
manually between when the roto-stop lever is released and when it is
squeezed. If you can turn the cutting attachment smoothly without
squeezing the roto-stop lever, there is no resistance difference between
when the roto-stop lever is released and when it is squeezed, you feel it -
abnormal, have the grass/weed trimmer inspected and repaired your
authorized servicing dealer.
39
6. STARTING THE ENGINE
e Exhaust gas contains poisonous carbon monoxide. Never run the
engine in an enclosed area. Be sure to provide adequate ventilation.
e Start the engine in a place away from the people, pets, and surround-
tng buildings. Be sure there are no obstacles in the working area.
CAUTION: Do not start the engine with the grass/weed trimmer hanged
from the carrying harness or raised in the air off the ground. The trimmer
can make unexpected movement causing injury in your legs, etc.
NOTE: Place the grass/weed trimmer in an area free from the obstacles, and
be sure the cutting attachment is not in contact with the ground and other
materials,
1. Turn the engine switch to the ON position.
Loop handle type (LTE and LE):
ENGINE SWITCH
Loop handle type (LEB):
ENGINE SWITCH
40
U-shaped handle type (UE):
. ENGINE SWITCH
ON.......
U-shaped handle type (UEB):
ENGINE SWITCH
41
2. To start a cold engine, move the choke lever to the CLOSED position.
To restart warm engine, leave the choke lever in the OPEN position.
CHOKE LEVER
CLOSED ......
3. Press the priming pump several times until a flow in the fuel return tube
(transparent tube) is visually noticed.
FUEL RETUAN TUBE (TRANSPARENT TUBE)
PRIMING PUMP
42
4. Pull the starter grip lightly until you feel resistance while holding the main
pipe, then pull briskly. Return the starter grip gently.
CAUTION:
«e Do not allow the starter grip to snap back against the engine.
Return it gently to prevent damage to the starter.
e Damage may result if the starter grip is pulled while the engine is
running.
5. If the choke lever has been moved to the CLOSED position to start the
engine, gradually move it to the OPEN position as the engine warms up.
CHOKE LEVER
43
AA SR
1
Idle-up function (LTE, LE and UE)
The idle-up function Is a function that helps an engine to start by opening the
throttle valve in the carburetor moderately when the engine won't start.
1. Hold down the throttle trigger interlock.
2. Pull the throttle trigger.
3. Push the idle-up knob, then release the throttle trigger and throttle trigger
interlock in that order.
4. Start the engine.
NOTE: This function must not be used while trimming work.
If the engine won't start after performing the idle-up function, consult the
Honda servicing dealer.
Loop handle type:
3 IDLE-UP KNOB
THROTTLE TRIGGER
INTERLOCK
THROTTLE TRIGGER
U-shaped handle type:
IDLE-UP KNOB
THROTTLE TRIGGER THROTTLE TRIGGER INTERLOCK
44 | |
7. TRIMMING OPERATION
Read and understand the safety instructions on pages 4 to 13 before operating
the grass/weed trimmer.
lf you notice any abnormal sound, smell, vibration, or other unusual signs, stop
the engine immediately and consult your authorized Honda dealer.
Grass/weed trimmer holding position adjustment:
Stop the engine and adjust the length of the carrying harness.
1. Adjust the carrying harness so that the quick-release latch is positioned at
your right hip.
2. Hang the trimmer cn the carrying harness hook by its hanger.
3. Keep the trimmer so that the cutting attachment (nylon-line cutting head,
cutting blade or saw blade} is parailel to the ground by holding the handle
with your both hands.
4. Adjust the carrying harness length so that the cutting attachment Is parallel
to the ground and stays above the ground keeping the clearance specified
below.
CARRYING HARNE
QUICK-RELEASE ss
LATCH
HANDLE
HANGER
ATTACHMENT
Parallel ta the ground and
0 - 30 cm (0 — 11.8 In.) for the nylon-line
HIP PAD cutting head and 10 — 30 cm (3.9 — 11.8 in.} for
(U-shaped handle type only) GROUND } the cutting/saw blade clear of the ground.
Do not operate the grass/weed trimmer if the wheeling
cutting attachment could reach your feet. Your feet can get injured if the
wheeling cutting attachment touches your feet.
Stop the engine and check the balance of the grass/weed trimmer between its
front and rear sides.
1. Hold the grass/weed trimmer at the correct position as mentioned above.
2. Slacken your grip on the handle gradually. Do not release but put your both
hands lightly on the handle, and be sure that the height of the cutting
attachment from the ground does not change large this time.
Adjustment is necessary if the cutting attachment rises high above your
knees. Do not operate the grass/weed trimmer before adjustment, and
consult your authorized Honda dealer for adjustment.
45
Basic operation:
e With the engine idling, hook the trimmer to your carrying harness and hold
the trimmer at the correct position. Be careful to avoid contact with the
cutting attachment (nylon-line cutting head, cutting blade or saw blade)
while handling the trimmer with the engine running.
The cutting attachment should not rotate with the engine idling. If there is
rotation at idle, adjust the idle speed correctly before using the trimmer. For
idle adjustment, consult your servicing dealer.
QUICK-RELEASE
e Holdthe trimmer firmly with both hands, with your fingers and thumbs encir-
cling the handles as shown. This will help you to keep the trimmer under
control at all times.
Keep firm footing and balance.
Do not overreach.
Keep the cutting attachment below your knee height.
Keep all part of your body away from the rotating cutting attachment and
hot surfaces.
46
ee
ee AR A al ==
L
e Operate the grass/weed trimmer not by using your arm force but by using
your waist so that the cutting attachment swings in a level arc from right to
left.
Hold the grass/weed trimmer so that you can shift your weight to the right
leg then to the left leg safely and easily, and walk siowly.
e When operating the grassfveed trimmer on a moderate slope, stand at the
down side of the slope. The steep slope is slippery and you can lose your
balance. Do not operate the grass/weed trimmer on a steep slope.
CAUTION: Take good care of your step. Do not operate the grass/weed
trimmer in a place where is slippery, or you can lose your balance.
« [nan emergency, pull up the quick-release latch tab to detach the grass/
weed trimmer from the carrying harness.
QUICK-RELEASE LATCH TAB
e Your grass/weed trimmer is not designed to cut down the trees. Do not use
your grass/weed trimmer as a pruner hook.
47
8. STOPPING THE ENGINE
1. Release the throttle trigger.
2. Turn the engine switch to the OFF position.
CAUTION: Note that the cutting attachement keeps turning for a while
by inertia after the engine its stopped.
Loop handle type (LTE and LE):
ENGINE SWITCH
THROTTLE TRIGGER
Loop handle type (LEB):
ENGINE SWITCH
RELEASED
THROTTLE TRIGGER
48
— ——— OSÁñú
1 .
=
r
U-shaped handle type (UE):
ENGINE SWITCH
RELEASED
THROTTLE
TRIGGER
U-shaped handle type (UEB):
ENGINE SWITCH
-.
RELEASED
RELEASED
THROTTLE
TRIGGER
NOTE: Be sure that the engine is stopped and the cutting attachment stops
turning before placing the grass/weed trimmer on the ground.
49
ween ee XI U m ol nn -
=
9. MAINTENANCE
. Before performing any maintenance, place the grass/weed trimmer оп а
level surface, stop the engine and remove the spark plug cap to be certain
the engine will not start accidentally.
e jhe grass/weed trimmer should be serviced by an authorized Honda
dealer unless the owner has proper tools and service data and feels he is
mechanically qualified.
CAUTION: Use only genuine Honda parts or their equivalent for main-
tenance or repair. Replacement parts which are not of equivalent quality
may damage the trimmer.
Periodic inspection and adjustment of the Honda UMK422/UMK431 are
essential if high level performance is to be maintained. Regular maintenance
will also help to extend service life. The required service intervals and the kind
of maintenance to be performed are described in chart on the following page.
For longer service and efficiency, keepthe underside ofthe debris shield clean
and free of accumulated grass clippings by washing it down with a hose after
each use and/or cleaning it with a wire brush and scraper.
50
Ur m
.
nn o
.
Maintenance schedule
REGULAR SERVICE PERIOD (4) Before | First [Every 3|Every 6| Every Every 2 Reter
of operating hour interval each | Month ¡Months| Monihs| Year or TS to
whichever comes first. | Use 10 Hrs. 25 Hrs, 50 Hrs. 100 Firs, ‘er page
ITEM 300 Hrs.
Engine oil Check O 28
Change о O 53
Air cleaner Check © 33
Clean O (1) 55
Cutting attachment Check O 35
Debris shield Check O 37
Nuts, bolts, fasteners Check 28
(Retighten if necessary}
ns check [о 4
Throttle cable Check О 34, 64
stop lover worl & ву er © (8) 39
Roto-stop efficiency Check O (3) 39
Roto-stop cable Check-Adjust O (218) © (2)(3)
Foto-stop shoe & Clutch Check-Adjust O (21(3)
Gear case Lubricate O (2)
Clutch shoes and drum Check O (2)
Spark plug Check-Adjust O 62
Replace O 62
Engine cooling fins Check O 66
Idle speed Check-Adjust O (2)
Valve clearance Check-Adjust O (2)
Combustion chamber Clean O (2)
Fuel filter Check O 67
Fuel tank Clean O 68
Fuel line Check Every 2 years [Replace(2) if necessary]
NOTE: (1) Service more frequently when used in dusty areas.
(2) These items should be serviced by your servicing dealer, unless you have the proper tools
and are mechanically proficient. Refer to Honda shop manual for service procedures.
(3) Roto-stop type only.
(4) Los hours of operation to determine proper maintenance intervals.
91
Tool kit
The tools supplied are necessary for performing some periodic maintenance,
simple adjustments and repairs.
B) Ó SPARK PLUG WRENCH
SY CS 10 x 12 mm WRENCH
4mm HEXAGON WRENCH
5 шт HEXAGON WRENCH
BAR (used to turn a spark
plug wrench)
52
1. Engine oil change
NOTE:
« Drain the oil while the engine is still warm to assure rapid and complete
draining.
ls
. Check the fuel tank cap is tightened.
2. Remove the oil filler cap and drain the oil into the oil container by tipping the
engine toward the oil filler neck.
3. Refill with the recommended oil (See page 29) and check the oil level (see
page 28).
4. Install the oil filler cap.
ENGINE OIL CAPACITY: 0.10 £ (0.11 US qt, 0.09 Imp qt)
Wash your hands with soap and water after handling used oil.
OIL FILLER NECK
OIL FILLER NECK
UPPER OIL
OIL FILLER CAP LIMIT
UPPER OIL LIMIT
53
NOTE: Please dispose of used motor oil in a manner that is compatible with
the environment. We suggest you take it in a sealed container to your local
service station for reclamation. Do not throw it in the trash or pour it on the
ground.
54
2. Air cleaner service
A dirty air cleaner will restrict air flow to the carburetor. To prevent carburetor
malfunction, service the air cleaner regularly. Service more frequently when
operating the grass/weed trimmer in extremely dusty areas.
Never use gasoline or low flash point solvents for cleaning
the air cleaner element. A fire or explosion could result.
CAUTION: Never run the engine without the air cleaner. Rapid engine
wear will result.
1. Move the choke lever to the CLOSED (upwards) position.
2. Remove the air cleaner cover by unhooking the upper tab on the top of the
air cleaner cover and its two lower tabs.
3. Wash the element in a nonflammable or high flash point solvent and dry it
thoroughly.
4. Soak the element in clean engine oil and squeeze out the excess oil.
5. Reinstall the air cleaner element.
6. Reinstall the air cleaner cover by inserting the lower tabs, then insert the
upper tab.
AIR CLEANER ELEMENT
CHOKE LEVER
UPPER TAB
LOWER TABS 55
3. Cutting attachment replacement
Nylon-line cutting head:
¢ To avoid severe personal injury, disconnect the spark plug cap to
prevent accidental starting.
e Use a genuine Honda replacement cutting head or its equivalent.
CAUTION: Wear heavy gloves to protect your hands when replacing the
cutting head.
1. Stop the engine and remove the spark plug cap.
2. Insert a 4 mm hexagon wrench into the locking tool hole to keep the drive
shaft from turning.
4mm HEXAGON WRENCH
3. Turnthe cutting head assembly clockwise to remove it from the gear case.
Replace it with new one.
CUTTING HEAD
ASSEMBLY
GEAR CASE
56
The line feeding action:
The nylon line comes out when the cutting head is tapped against the ground
while the engine is running. Adebris shield with cut-off knife must be used with
it. |
SN
97
Cutting blade:
To avoid severe personal injury, disconnect the spark plug cap to
prevent accidental starting.
Use a genuine Honda replacement cutting blade or its equivalent.
CAUTION: Wear heavy gloves to protect your hands, when working
around the cutting blade.
1.
2.
Install a protective plastic cover (that came with the blade) on the edge of
the cutting blade for safety and protecting the blade.
Insert the tip ofthe 4 mm hexagon wrench (supplied with your trimmer) fully
into the hole on the gear case.
. Turnthe cutting blade until you feel the tool drops into the hole in the internal
locking ring. Verify the blade does not turn. The drive bolt and blade nut use
left-hand threads. Make sure the 4 mm hexagone wrench remains in the
hole, then loosen (turn clockwise) the self-locking nut. Pay attention to the
order and orientation of the parts as they are removed.
Installation can be performed in the reverse order of removal. Make sure
you install the blade with the cutting edge in the direction of rotation. Torque
the blade nut to 1.9 kgf-m (19 N-m, 14 ft-lb).
CUTTING BLADE
LOCK RING
The blade turns clockwise
| f he blade.
SELF-LOCKING NUT as viewed from the blade
PROTECTIVE PLASTIC
GLIDE CUP \ DRIVE BOLT
COVER PLATE
GEAR CASE 4mm HEXAGON WRENCH
58
A A AAA nn
= II
.
Saw blade (for UE and UEB types only):
To avoid severe personal injury, disconnect the spark plug cap to
prevent accidental starting.
CAUTION: Wear heavy gloves to protect your hands, when working
around the saw blade.
1.
2.
3.
Install a protective plastic cover (that came with the blade) on the edge of
the saw blade for safety and protecting the blade (see page 60).
Insertthe tip ofthe 4 mm hexagon wrench (supplied with your trimmer) fully
into the hole on the gear case.
Turn the saw blade until you feel the tool drops into the hole in the internal
locking ring. Verify the blade does not turn. The drive bolt and blade nut use
left-hand threads. Make sure the 4 mm hexagone wrench remains in the
hole, then loosen (turn clockwise) the self-locking nut. Pay attention to the
order and orientation of the parts as they are removed.
. Installation can be performed in the reverse order of removal. Make sure
you install the blade with the cutting edge in the direction of rotation. Torque
the blade nut to 1.9 kgf-m (19 N-m, 14 ft-lb).
SAW BLADE
LOCK RING § (commercially available)
The blade turns clockwise
as Viewed from the blade.
a
SELF-LOCKING NUT
PROTECTIVE PLASTIC COVER
DRIVE BOLT
GLIDE CUP
COVER PLATE
Standard: 25.4 тт (1.0 т.) т 1.0.
Accessory: 20.0 mm (0.8 In.) in 1.D,
SPACER
Standard: 25.4 mm (1.0 In.) in O.D.
Accessory: 20.0 mm (0.8 in.) in O.D.
4 mm HEXAGON WRENCH
GEAR CASE 59
Blade cover installation and removal on and from saw blade:
(for UE and UEB types only) BLADE
(commercially available}
1. Place the blade cover on the blade half- DEBRISSHIELD | enna
way starting with the end A. To prevent
the tabs on the end A from interferring
with the debris shield, remove the end
A from the blade and place it on the
blade as shown.
2. Turn the blade little by little until the end
A is clear of the debris shield.
3. Replace the end A on the blade.
4. Secure the end B to the end A by insert-
ing the two tabs on the end A in the
hoies in the end B.
The blade cover can be removed in the reverse order of installation.
60
-- mme ——-: ILL
4. Debris shield change
AWARNING
e Install the debris shield in the proper position securely to protect you
from the debris that are thrown from a wheeling cutting attachment.
CAUTION: Wear heavy gloves to protect your hands, when working
around the cutting attachment.
Refer to the illustration below for removing and installing the debris shields.
Note that the debris shield for the nylon-line cutting head uses an additional
spacer plate and the longer 5 x 30 mm bolts.
Tighten the bolts securely. Torque the bolts to 0.34 kgf-m (3.4 Nem, 2.5 ft-lb).
5 x 30 mm 5 x 30 mm 5 x 30 mm
BOLTS {4} BOLTS (4) BOLTS (4)
Ae За 5 mm
A a 3% 5mm 28% WASHERS (4)
: AN WASHERS (4 YU,
N E à DEFLECTOR
DEFLECTOR PLATE
PLATE DEFLECTOR
À SPACER
Ke
ADI
5 mm
WASHERS (4) 2 à \
DEFLECTOR A Y A ©)
SPACER s y ks
NYLON-LINE HEAD CUTTING BLADE
DEBRIS SHIELD DEBRIS SHIELD
SAW BLADE
DEBRIS SHIELD
61
5. Spark plug service
Recommended spark plug: CR5HSB (NGK), U16FSR-UB (DENSO)
To ensure proper engine operation, the spark plug must be properly gapped
and free of deposits.
If the engine has been running, the muffler will be very hot,
be careful not to touch the muffler.
CAUTION: Never use a spark plug of incorrect heat range.
1. Remove the spark plug cap and use the proper size spark plug wrench to
remove the spark plug.
SPARK PLUG
SPARK PLUG CAP
2. Visually inspect the spark plug. Discard it if there is apparent wear or the
insulator is cracked or chipped. Clean the spark plug with a wire brush if it
is to be reused.
62
3. Measure the plug gap with a feeler gauge. |
The gap should be 0.60 - 0.70 mm (0.024 —0.028 in.) Correct as necessary
by carefully bending the side electrode.
0.60 — 0.70 mm
(0.024 - 0.028 In.)
4. Check thatthe spark plug washer is in good condition and thread the spark
plug in by hand to prevent cross-threading.
>. After the spark plug is seated, tighten with a spark plug wrench to compress
the washer.
NOTE:
After a new spark plug has been seated by hand, it should be tightened 1/2 turn
with a wrench to compress its washer.
If a used plug is being reinstalled, it should only require 1/8 to 1/4 turn after
being seated.
CAUTION: The spark plug must be securely tightened. An improperly
tightened plug can become very hot and possibly damage the engine.
63
6. Throttle cable check and adjustment
Adjust the throttle cable free play properly.
Adjustment:
1.
2.
Move the choke lever to the
CLOSED (upwards) position.
Remove the air cleaner cover by
unhooking the upper tab on the
top of the air cleaner cover and
its two lower tabs.
. Loosen the throttle cable fixing
nut.
Check the throttle cable free play
at the tip of the cable by pulling
and releasing the throttle trigger
a few times and adjust the free
play by using the adjusting nut. It
should be 1 — 3 mm (0.039 —
0.118 in.) atthe tip of the throttle
cable.
64
COVER
UPPER TAB
FIXING NUT
ADJUSTING
NUT
CHOKE LEVER
LOWER TABS
FREE PLAY:
1-3mm
(0.039 — 0.118 in.)
f
TIP OF FHE THROTTLE CABLE
5. Reinstall the air cleaner cover by inserting the lower tabs, then insert the
upper tab.
CAUTION:
+ After removing the air cleaner cover, reinstall the air cleaner cover
securely.
Failure to tighten the cover securely may cause the cover to come out
of position by vibration or some sort of engine malfunction.
+ Operating the engine without the air cleaner or improperly installed
air cleaner will allow dirt to enter the inside of the engine, causing
adverse effect to the engine.
After adjustment, check the throttle trigger for smooth operation. Check the
throttle cable free play at the tip of the cable again.
Consult your authorized Honda dealer if necessary.
Loop handle type (LTE and LE): U-shaped handle type (UE):
THROTTLE TRIGGER
Loop handie type (LEB): U-shaped handle type (UEB):
THROTTLE TRIGGER
THROTTLE TRIGGER
65
7. Engine cooling fin inspection
Inspect the cooling fin visually through the cover. If there are dry grass, leaves
and mud clagged, consult your authorized Honda power equipment dealer for
cleaning it.
COOLING FIN {inside the cover)
66
8. Fuel tank strainer service
Note that the clogged fuel filter can cause poor engine performance.
Gasoline is extremely flammable and is explosive under
certain conditions. You can be burned or seriously injured when han-
dling fuel. Observe the following when servicing the fuel tank strainer.
—
Stop the engine.
Inspect in a well-ventilated area.
Keep heat, sparks, and flame away. Do not smoke.
Do not spill the gasoline. If you spilled the gasoline, wipe it up
immediately and dispose of the cloth or shop towel you wiped the
spilled gasoline in a manner that is compatible with the environment.
. Be sure that the engine oil filler cap is tightened securely.
Remove the fuel tank cap and drain the gasoline into the container by
tipping the engine toward the fuel filler neck.
ENGINE OIL FILLER CAP
. Pull out the fuel tank strainer with the mechanic's wire from the fuel filler
neck gently.
. Check the fuel tank strainer for contamination. If the fuel tank strainer is
dirty, wash it gently with nonflammable or high flash point solvent. If the fuel
tank strainer is excessively dirty, replace it.
FUEL STRAINER
. Reinsiall the fuel tank strainer into the fuel tank and tighten the fuel tank cap
securely.
67
eee ee A A a ee к
9.
Fuel tank cleaning
Water and dust, dirt or foreign material in the fuel tank cause a poor engine
performance.
Gasoline is extremely flammable and is explosive under
certain conditions. You can be burned or seriously injured when han-
dling fuel. Observe the following when cleaning the fuel tank.
Stop the engine.
Inspect in a well-ventilated area.
Keep heat, sparks, and flame sway. Do not smoke.
Do not spill the gasoline. If you spilled the gasoline, wipe it up
immediately and dispose of the cloth or shop towel you wiped the
spilled gasoline in a manner that is compatible with the environment.
. Be sure that the engine oil filler cap is tightened securely.
. Remove the fuel tank cap and drain the gasoline into the container by
tipping the engine toward the fuel filler neck.
ENGINE OIL FILLER CAP
FUEL FILLER NECK
. Pull out the fuel tank strainer with the mechanic's wire from the fuel filler
neck gently.
. Remove water and dirt stood in the fuel tank by rinsing the inside of the fuel
tank with nonflammable or high flash point solvent.
. Reinstall the fuel tank strainer into the fuel tank and tighten the fuel tank cap
securely.
68
10. STORAGE
Proper storage preparation is essential for keeping your grass/weed trimmer
trouble free and looking good. The following steps will help to keep rust and
corrosion from impairing your grass/weed trimmer.
CAUTION:
e If the grass/weed trimmer has been running, the engine will be very
hot; allow it to cool before proceeding.
e Place the grass/weed trimmer onalevel surface and remove the spark
plug cap to be certain the engine will not start accidentally.
1. Clean all exterior surfaces, touch up any damaged paint, and coat other
areas that may rust with a light film of oil.
2. Drain the fuel.
Gasoline is extremely flammable and explosive under cer-
tain conditions. Do not smoke or allow flames or sparks in the area.
a. Be sure that the engine oil filler cap is tightened securely.
b. Remove the fuel tank cap and drain the fuel into the container by tipping the
engine toward the fuel filler neck.
ENGINE OIL FILLER CAP
FUEL FILLER NECK
69
-. ¿- ee _ Qu €Q —— mn oe ee -
c. Press the priming pump several times until all fuel leftin the fuel returntube |
is returned into the fuel tank.
FUEL RETURN TUBE
(TRANSPARENT TUBE)
FUEL TANK CAP
d. Tip the engine toward the fuel filler neck again to drain the fuel left in the
fuel tank into the container.
e. Tighten the fuel tank cap securely after draining the fuel completely.
3. Change the engine oil (see page 53).
4. Clean the air cleaner (see page 55).
5. Remove the spark plug and pour about a tablespoon of clean engine ail into
the cylinder.
6. Crank the engine several revolutions to distribute the oil, then reinstall the
spark plug. Pull the starter grip slowly until resistance is felt.
7. Cover the grass/weed trimmer to keep out dust.
70
11. TROUBLESHOOTING
When the engine will not start:
1. Is the engine switch in the ON position?
2. Is there fuel in the fuel tank (see page 30)?
Gasoline is extremely flammable and explosive under cer-
tain conditions. Do not smoke or allow flames or sparks in the area.
3. ls gasoline reaching the carburetor?
To check, press the priming pump several times (see page 42).
4, Is there a spark at the spark plug (see page 62)?
a.
D.
С.
а.
е.
Remove the spark plug cap. Clean any dirt from around the spark plug
base, then remove the spark plug.
Install the spark plug in the plug cap.
Turn the engine switch ON.
Grounding the side electrode to ihe cooling fin below the spark plug
hole, pull the recoil starter to see if sparks jump across the gap.
lf there is no spark, replace the spark plug.
lf OK, reinstall the spark plug and try to start the engine according to the
instructions.
5. If the engine still does not start, take the grass/weed trimmer to an
authorized Honda dealer.
When an abnormal vibration occurs during operation, immediately turn off the
engine and check the cutting attachment is properly installed and tightened
securely, and inspect it for wear, crack or any other damage. If necessary,
replace it (see page 56).
71
12. SPECIFICATIONS
Model UMK422K1
Power products
description code KAAF
Frame
Type UE
Handle type U-shaped
Overall length 1,900 mm
(74.8 in)
Overall width 610 mm
(24.0 in)
Overall height 430 mm
(16.9 in)
Dry weight 6.5kg
(without cutting head) (14,3lbs)
Clutch type Centrifugal clutch
Tool Nylon-line
Cutter Type Semi-automatic line feed
O.D. 420 mm (16.5 in)
Accessory cutting attachment
Type UE
Tool Cutting blade
Cutter Shape 4-tooth blade
O.D. 230 mm (9.1 in)
Applicable debris shield
Type UE
For nylon-line
cutting head
For cutting blade
For saw blade:
less than 254 mm O
(10.0 in) in O.D.
NOTE:
Specifications may vary according to the types, and are subject to change
without notice.
72
Model UMK422k1
Power products
description code KAAF
Frame
Type LTE | LE
Handle type Loop
Overall length 1,885 mm 1,300 mm
(74.2 in) (74.8 in)
Overall width 345 mm 355 mm
(13.6 in) (14.0 in)
Overall height 265 mm 265 mm
(10.4 in) (16.9 in)
Dry weight 6.2 kg 6.4 kg
(without cutting head) (13.7 lbs) (14.1 lbs)
Clutch type Centrifugal clutch
Tool Nylon-line
Cutter Type Semi-automatic line feed
O.D. 420 mm (16.5 in)
Accessory cutting attachment
Type LTE LE
Tool Cutting blade
Cutter Shape Not assigned 4-tooth blade
O.D. 230 mm (9.1 in)
Applicable debris shield
Type LTE LE
For nylon-line
cutting head O O
For cutting blade ©
NOTE:
Specifications may vary according to the types, and are subject to change
without notice.
73
2 > E_ 3 o _ _—_ A An
"
Model
UMK431K1
Power products
description code
KABF
Frame
Type
UE
| UEB
Handle type
U-shaped
Overall length
1,900 mm
(74.8 in)
1,875 mm
(73.8 in)
Overall width
610 mm
(24.0 in)
605 mm
(23.8 in)
Overall height
430 mm
(16.9 in)
450 mm
(17.7 in)
Dry weight
(without cutting head)
7.5 kg
(16.5 lbs)
7.4 kg
(16.3 lbs)
Clutch type
Centrifugal clutch
Roto-stop
| O
Tool
Nylon-line
Cutter Type
Semi-automatic line feed
О.0.
445 mm (17.5 in)
Accessory cutting attachment
Type
UE | UEB
Tool
Cutting blade
Cutter Shape
4-tooth blade
O.D.
230 mm {9.1 in)
Applicable debris shield
Type
UE UEB
For nylon-line
cutting head
For cutting blade
For saw blade:
less than 254 mm
{10.0 in} in O.D.
NOTE:
Specifications may vary according to the types, and are subject to change
without notice.
74
Model UMK431K1
Power products
description code KABF
Frame
Type LE | LEB
Handle type Loop
Overall length 1,900 mm 1,885 mm
(74.8 in) (74.2 in)
Overall width 355 mm 345 mm
(14.0 in) (13.6 in)
Overall height 265 mm 265 mm
(16.9 in) (16.9 in)
Dry weight 7.1 Ка 7.2 kg
(without cutting head) (15.7 lbs) (15.9 lbs)
Clutch type Centrifugal clutch
Roto-stop O
Tool Nylon-line
Cutter Type Semi-automatic line feed
O.D. 445 mm (17.5 in)
Accessory cutting attachment
Type LE | LEB
Tool Cutting blade
Cutter Shape 4-tooth blade
O.D. 230 mm (9.1 in)
Applicable debris shield
Type LE LEB
For nylon-line
cutting head O
For cutting blade ©
NOTE:
specifications may vary according to the types, and are subject to change
without notice.
Sound pressure levels and vibrations:
LTE type:
Model UMK422K1
Type LTE
Sound Power level guaranteed 109 dB(A)
(in accordance with directive 2000/14/CE)
Sound Pressure Level at operator's 87 dB(A)
ears (150-7917)
Vibrations Measurement Lefthand side 1 mis?
at idling (ISO-7916} Righthand side 9.2 mis’
Vibrations Measurement at Lefthand side 5 mis?
maximum throttle (150-7916) Righthand side 3.2 mis’
UE type:
Model UMK422K1 | UMK431K1
Type UE
Sound: Power level guaranteed Nylon-line head} 111 dB(A) | 111 dB(A}
{in accordance with directive 2000/14/CE) Cutting blade | 104 dB(A) | 109 dB(A)
Sound Pressure Level at operator's Nylon-line head) 87 dB(A) | 101 dB(A)
ears (150-7917) Cutting blade | 82 dB(A) | 92 dB(A}
at idlin Nylon-line head] 5 m/s? 6.7 mis’
Vibrations Measurement at | Cutting blade | 6 пи 3.4 mis”
lefthand side (50-7916) — [at max.throttle|Nylon-line head] 4.6 m/s? | 4.5 mis?
at racing | Cutting blade | 2.7 mis’ 7.4 m/s’
at idling Nylon-line head] 4.7 m/s? 5.5 mis’
Vibrations Measurement at Cutting blade | 43m/s" | 4.9 mis’
righthand side (150-7916) — at max.throttle|Nylon-line head] 3.3 m/s? | 4.1 mis’
atracing | Cutting blade | 3.2 m/s? | 2.8 mis’
NOTE:
Specifications may vary according to the types, and are subject to change
without notice.
76
=
— D =
A AAA RÁ
Sound pressure levels and vibrations (cont'd):
LE type:
Model UMK422K1 | UMK431K1
Type LE
Sound Power level guaranteed Nylon-line head] 109 dB(4)| 111 dB(A)
(in accordance with directives 2000/14/CE) Cutting blade | 104 dB(A}| 109 dB(A)
Sound Pressure Level at operator's Nylon-line head] 87 dB(A) | 101 dB(A)
ears (150-7917) Cutting blade | 82dB(4) | 92 dB(A)
m Nylon-line head} 1.6 m/s’ 2.9 mis?
| at idling =
Vibrations Measurement at Cutting blade 1.6 m/s 1.8 mis
lefthand side (150-7916) lat max.throtile|Nylon-line head] 7.6mis? | 4.3 mis’
at racing | Cutting blade 4.4 mis’ 3.6 mis?
ap Nylon-line head] 1.9 mis’ 5.7 mis’
og at idling : = =
Vibrations Measurement at Cutting blade 1.8 mis 4.4 mis
righthand side (150-7916) — [at max.throttle[Nylon-line head] 5.1m/s? | 5.6 mis’
| atracing | Cutting blade 7.5mis* | 7.1mis’
UEB type:
Model UMK431K1
Type WEB
Sound Power level guaranteed Nylon-line head 111 dB(A)
(in accordance with directives 2000/14/CE) Cutting blade 109 dB(A)
Sound Pressure Level at operator's Nylon-line head 101 dB(A}
gars (150-7917) Cutting blade 92 dB(A)
re Nylon-line head 3.9 m/s’
an at idling =
Vibrations Measurement at Cutting blade 6.2 m/s
lefthand side (ISO-7916} —_ lat max.throttle|Nylon-line head 5.5 mis’
atracing | Cutting blade 7.4 mis’
m Nylon-line head 2.2 mis’
ae at idling =
Vibrations Measurement at Cutting blade 2.1 ms
righthand side (150-7916) |at max.throttie[Nylon-line head 5.4 mis’
atracing | Cutting blade 6.5 mis’
NOTE:
Specifications may vary according to the types, and are subject to change
without notice.
77
Sound pressure levels and vibrations (cont'd):
LEB type:
Model UMK431K1
Type LEB
Sound Power level guaranteed Nylon-line head 111 dB(A)
(in accordance with directives 2000/14/CE) Cutting blade 109 dB(A)
Sound Pressure Level at operator's Nylon-tine head 101 dB(A)
ears (ISO-7917) Cutting blade 92 dB(A)
o Nylon-line head 2.6 mis’
| at idling =
Vibrations Measurement at Cutting blade 2.6 mis
lefthand side (150-7916) [at max.throttle[Nylon-line head 6.3 mis?
atracing | Cutting blade 5.6 mis
un INylon-line head 3.9 mis’
| at idling - =
Vibrations Measurement at Cutting blade 3.1 m/s
righthand side (1$50-7916} at max.throttie|Nylon-line head 7.4 m/s
at racing | Cutting blade 5.9 mis?
Engine
MODEL UMK422K1 UMK431K1
Engine model GX22 GX31
Engine description code GCAFF GCAGF
Engine type 4-stroke, overhead valve, 1 cylinder
Displacement 22 cm? (1.3 cu-in) 31 cm? (1.9 cu-in)
Bore x Stroke
33 x 26 mm (1.3 x 1.0 in)
39 x 26 mm (1.5 x 1.0 in)
Max. output (ISO 8893)
0,56 kW (0,75PSY7,000 rpm
0,84 kW (1,13 PS)/7,000 rpm
Max. torque
1.09 N«m (0.11 kgi-m)/
4,500 rpm
1.64 Nm (0.17 kgf-my/
4,500 rpm
Fuel consumption
340 g/kWh (250 g/PSh)
Cooling system
Forced air
Ignition system
Transistor magneto
Oil capacity
0.1 2 (0.11 US at, 0.09 Imp qt)
Fuel tank capacity
0.45 2 (0.119 US gal,
0.099 Imp gal)
0.65 @ (0.172 US gal,
0.143 Imp gal)
Spark plug
NGK: CR5HSB, DENSO: U16FSR-UB
NOTE:
Specifications may vary according to the types, and are subject to change
without notice.
78
13. MAJOR HONDA DISTRIBUTOR ADDRESSES IN EUROPE
NAME OF FIRM (COMPANY) ADDRESS TEL: FAX:
Honda (U.K.) Limited 470 London Road Tel: 01753-590-590
Slough Berkshire SL3 8QY Fax: 01753-590-000
United Kingdom
Honda Europe Power
Equipment S.A.
Pole 45 Rue des Chataigniers
45140 Ormes
France
Tel: 1-3
Fax: 1-3
-65-06-00
-65-06-05
co 05
Honda Deutschiand
GmbH.
Sprendlinger, Landstraße 166
D-63069 Offenbach/Main
Germany
Tel: 069-83-09-0
Fax: 069-83-09-519
Honda Belgium H.V.
Wijngaardveld 1, 9300 Aalst
Belgium
Tel: 053-725-111
Fax: 053-725-100
Honda Italia Industriale
S.P.A.
Via della Cecchignola, 5/7
00143 ROMA
Italy
Tel: 06-54928-1
Fax: 06-54928-400
Honda (Suisse) $.A.
Route des Mouliéres 10
Case Postale Ch 1214
Vernier-Geneve, Switzerland
Tel: 022-341-22-00
Fax: 022-341-09-72
Honda Nederland В.М.
Nikkelstraat 17
Tel: 018-04-57-333
2984 Ridderkerk Fax: 018-04-91-888
Netherlands
Honda Austria G.M.B.H. | Honda Strasse 1 A-2351 Tel: 223-66-900
Wiener Neudorf Fax: 223-66-4130
Austria
Honda Power Equipment
Sweden A.B.
Ostmastargrand 8
Stockholm-Arsta
Sweden
Tel: 08-602-24-60
Fax: 08-722-36-27
Honda Produtos De
Forca, Portugal, S.A.
Lugar da Abrunheira
5. Pedro de Penaferrim
2710 Sintra, Portugal
Tel: 351-1-9150374
Fax: 351-1-9111021
Berema A/S Berghagan 5, Langhus Tel: 64-86-05-00
Box 454, 1401 Ski Fax: 64-86-05-49
Norway
OY Brandt AB Tuupakantie 4 Tel: 90-895-501
SF-01740, Vantaa Fax: 90-878-5276
Finland
79
NAME OF FIRM (COMPANY)
ADDRESS
TEL: FAX:
08530, La Garriga
(Barcelona), Spain
TIMA PRODUCTS A/S | Tárntalkevej 16, Postboks 511 | Tel: 31-49-17-00
DK 2650 Hvidovre Fax: 36-77-16-30
Denmark
Greens Polig. Industrial Congost Tel: 93-871-84-50
Fax: 93-871-81-80
Automocion Canarias
S.A. (AUCASA)
Apartado, de Correos, num 206
Santa Cruz de Tenerife
Canary Island
Tel: 922-61-13-50
Fax: 922-61-13-44
The Associated Motors
Company Ltd.
148, Rue D'Argens, Msida
Malta
Tel: 356-333001
Fax: 356-340473
Two Wheels Ltd. Crosslands Business Park, Tel: 4602111
Ballymount Road, Dublin 12, Fax: 4566539
Ireland
General Automotive P.O. Box 1200, 101 73 Athens | Tel: 346-5321
Go., S.A. Greece Fax: 346-7329
BG Technik s.r.o.
Radlicka 117/520
158 01 Praha 5
Czech Republic
Tel: 2-5694 573
Fax: 2-5694 571
Aries Power Equipment
Lid.
01-493 Warszawa,
ul Wroclawska 25a
Poland
Tel: 22-685 17 06
Fax: 22-685 16 03
MO.TOR.PEDO Ltd.
1134 Budapest,
Dózsa Gy.üt 61-63.
Hungary
Tel: 1-4652080
Fax: 1-4652081
80
37VFOFO2
00X37-VF9-F02
mn
HONDA
The Power of Dreams
y A nn гв - 4
Pee Le mme п
I
© Honda Motor Co., Ltd. 2001
F 6000 2001 11
Printed in France ;