original backhoe manual
LITW/SEWOONG
OPERATION & INSTALLATION MANUAL
BH6600/BH7600
Dealer Contact:
Edition 7/2007
TABLE OF CONTENTS
SECTION
PAGE
Safety ....................................2
Safety Decals
…........................3
Federal Laws and Regulations
....6
General Operation
....................7
Controls ..................................8
Operating The Backhoe .............9
Placing The Stabilizers
..............9 and 11
Transporting The Backhoe
........11
Filling The Bucket ....................12
Backfilling
..............................13
Service
..................................14
Beginning Of The Season
.........14
Hydraulic System .....…............14
Lubrication ............................14/15/16/27
SECTION
PAGE
Removal/Storage
.....................16
Hydraulic Trouble Shooting
.......18
Valve Repair
............................21
Control Valves
……………………….23
Assembly
................................25
Hydraulic Hook-Up ...................26
Mounting Kits ...........................28
Bucket Spec ………………………………..38
Torque Values …………………………………....38
Thumb Linkage………………….……….….39
Service Notes……………………………………...40
Parts ………………………………………………..41/57
Warranty………………………………………. 58
UNDERSTAND SIGNAL WORDS
DANGER: Indicates an imminently
hazardous situation which, if not
avoided, will result in death or serious
injury. This signal word is to be limited
to the most extreme situations.
WARNING: Indicates a potentially CAUTION: Indicates a potentially
hazardous situation which, if not
avoided, could result in death or
serious injury.
hazardous situation which, if not
avoided, may result in minor or
moderate injury. It may also be used
to alert against unsafe practices.
IMPORTANT SAFETY PRECAUTIONS
This symbol is used to call attention to safety
precautions that should be followed by the
operator to avoid accidents. When you see
this symbol, carefully read the message that
follows and heed its advice. Failure to comply
with safety precautions could result in serious
bodily injury.
In addition to the design and configuration of equipment, hazard control and accident prevention are
dependent upon the awareness, concern, prudence, and proper training of personnel in the operation,
transport, maintenance and storage of equipment. Lack of attention to safety can result in accident,
personal injury, reduction of efficiency and worst of all-loss of life. Watch for safety hazards and correct
deficiencies promptly. Use the following safety precautions as a general guide to safe operations
when using this machine. Additional safety precautions are used throughout this manual for specific
operating and maintenance procedures. Read this manual and review the safety precautions often
until you know the limitations.
AVOID HIGH-PRESSURE FLUID
ESCAPING fluid under pressure can have sufficient force to penetrate the skin and cause serious injury.
Be sure to stop engine and relieve all pressure before disconnecting lines. Be sure all connections are
tight and that lines, pipes, and hoses are not damaged before applying pressure to the system. Fluid
escaping not your hands-to search for suspected leaks. SEE A DOCTOR at once if injured by escaping
fluid. Serious infection or gangrene can develop if proper medical treatment is not administered
immediately.
2
SAFETY DECALS
The safety of the operator was a prime consideration in the design of the backhoe. Proper shielding,
convenient controls, simple adjustment and other safety features have been built into this implement.
The following decals are located on the backhoe. Keep decals clean and replace them immediately if
they are missing. Contact your dealer or SEWOONG for replacements.
Location: Left Side of Control Tower
Location: Left Side Toe Shield Area
Location: Right Side of Control Tower
3
Location: Right Side of Control Tower
SAFETY PRECAUTIONS CONTINUED
THE TRACTOR AND/OR LOADER (IF EQUIPPED)
1. Read the tractor and/or loader operator's manual to learn how to operate your tractor and/or
loader safely. Failure to do so could result in serious injury or death and equipment damage.
2. It is recommended that tractor be equipped with Rollover Protective System (ROPS) and a seat belt
be used for all loader operations
3. Add wheel ballast or front weight for stability.
4. Move wheels to the tractor manufacture's widest recommended settings to increase stability.
5. For better stability, use tractor with wide front axle rather than tricycle front wheels.
6. Move and turn the tractor at low speeds.
7. Stop tractor engine, place transmission in park (or neutral), engage parking break, lower loader
arms to ground, cycle all hydraulic controls to relieve pressure, allow machine moving parts to stop,
remove ignition key to prevent unauthorized person from starting engine before dismounting
tractor or serving, repairing, or making adjustments to the equipment.
8. Wear personal protective equipment (PPE), such as, but not limited to, protection for eyes, ears,
lungs, head. hands and feet when operating, servicing, or repairing equipment. Avoid wearing
loose clothing or jewelry that may catch and entangle on equipment moving parts.
THE BACKHOE
1. DO NOT operate the backhoe unless it is rigidly attached to the tractor.
2. KNOW your controls. Read this operator's manual and the manual provided with your tractor. Learn how to
stop the tractor, the engine and the backhoe quickly in an emergency.
3. PROVIDE adequate front end weight to counter-balance the backhoe at all times. 20% of the total tractor,
loader and backhoe weight must be on the tractor front axle. If unsure of weight distribution, at a weight
scale. Total vehicle weight, including backhoe and counter weights, must not exceed the ROPS certificate for
gross vehicle weight.
4. BE SURE the area is clear of overhead or underground utilities or other hazards.
5. POSITION a barricade around the work area.
6. KEEP all bystanders a safe distance away.
7. DO NOT attempt to enter operator's platform backhoe by using the stabilizers as a step.
8. OPERATE from the backhoe operator's seat only.
9. ALLOW only one person to operate the backhoe at any time.
10. DISENGAGE safety locks as shown in Figure 1&3 before attempting to operate the backhoe.
11. NEVER dig with the backhoe unless the stabilizers are properly set.
12. DO NOT dig under stabilizers or tractor backhoe. Soft ground or sandy soil can cause cave-ins.
13. KEEP BUCKET away from the stabilizer area to avoid possible stabilizer damage.
14. ALWAYS swing bucket uphill to dump when on a hillside and keep loaded bucket low.
4
15. SET BRAKES and block wheels when operating on hills and banks to avoid dangerous runaway.
16. WATCH for overhead wires. DO NOT touch wires with any part of the backhoe.
17. NEVER allow a person to work under a raised bucket.
18. NEVER lift a person with the backhoe.
19. DO NOT use the backhoe as a battering ram. Use the backhoe only for digging.
20. ALWAYS lower the backhoe bucket and stabilizers to the ground, shut off engine, and apply the parking
break before getting off unit, or when not digging.
21. NEVER leave the tractor unattended with the engine running.
22. DO NOT attempt to raise the tractor off the ground or move the tractor forward or backward using the backhoe
Dipper stick or bucket.
TRANSPORTATION
1. ALWAYS engage safety locks before transporting backhoe. See Figure 1 & 3.
2. DO NOT drive the tractor near the edge of a ditch or excavation.
3. ALWAYS use accessory lights and devices when transporting on a road or highway to warn operators of other
vehicles. Check your local government regulations.
4. BE SURE the SMV emblem is visible to the rear.
ADJUSTMENTS AND INSPECTION
1. CHECK pins that attach backhoe to tractor and all pivot pins for tightness several times daily. Replace
any parts that are bent, broken or missing.
2. ALWAYS engage safety locks before servicing backhoe. See Figures 1 & 3.
3. DO NOT oil, grease, or adjust the backhoe while it is in motion. For greasing, see Service section for details.
4. DO NOT change any backhoe relief valve settings. They are factory set for best backhoe performance and
safety.
5. PROTECT YOUR EYES - WEAR SAFETY GLASSES.
6. GUARD AGAINST INJURY when driving connecting pins or performing any repair in which particles can
chip from work piece or striking tool.
7. DO NOT remove any guards on backhoe or tractor.
5
IMPORTANT FEDERAL LAWS AND REGULATIONS*
CONCERNING EMPLOYERS, EMPLOYEES AND OPERATIONS.
*(This section is intended to explain in board terms the concept and effect of the following federal laws and
regulations. It is not intended as a legal interpretation of the laws and should not be considered as
such).
U.S. Public Laws 91-596 (The Williams-Steiger Occupational and Health Act of 1970) OSHA
This Act Seeks.
"...to assure so far as possible every working man and woman in the nation safe and healthful working
conditions and to preserve our human resources..."
DUTIES
Sec. 5 (a) Each employer-
(1) Shall furnish to each of his employees employment and place of employment which are free from
recognized hazard that are causing or are likely to cause death or serious physical harm to his employees;
(2) Shall comply with occupational safety and health standard promulgated under this Act.
(b) Each employee shall comply with occupational safety and health standards and all rules, regulations
and orders issued pursuant to this Act which are applicable to his own actions and conduct.
OSHA Regulations
Current OSHA regulations state in part: "At the time of initial assignment and at least annually
thereafter, the employer shall instruct every employee in the safe operation and servicing of all
equipment with which the employee is, or will
be involved." These will include (but are not limited to) instructions to: Keep all guards in place when the machine
is in operation;Permit no riders on equipment;
Stop engine, disconnect the power source, and wait for all machine movement to stop before servicing, adjusting,
cleaning or unclogging the equipment, except where the machine must be running to be properly serviced or
maintained, in which case the employer shall instruct employees as to all steps and procedures which are necessary
to safely service or maintain the equipment.
Make sure everyone is clear of machinery before starting the engine, engaging power, or operating the machine.
EMPLOYEE TRACTOR OPERATING INSTRUCTIONS:
1. Securely fasten your seat belt if the tractor has ROPS.
2. Where possible, avoid operating the tractor near
ditch, embankments, and holes.
3. Reduce speed when turning, crossing slopes, and on
rough, slick, or muddy surfaces.
4. Stay off slopes too steep for safe operation.
6. Do not permit others to ride.
7. Operate the tractor smoothly - no jerky turns, starts,
or stops.
8. Hitch only to the drawbar and hitch points
recommended by tractor manufactures.
9. When the tractor is stopped, set brakes securely and
use park lock if available.
5. Watch where you are going, especially at row
ends, on roads, and around trees.
Child Labor Under 16 Years Old
Some regulations specify that no one under the age of 16 may operate power machinery. It is your responsibility
to know what these regulations are in your own area or situation. (Refer to U.S. Dept. of Labor, Employment
Standard Administration, Wage & Home Division, Child Labor Bulletin #102.)
6
GENERAL OPERATION
Dipper Stick
Boom
Safety Swing Lock
CAUTION
To avoid possible injury,
observe the following safety
rules BEFORE OPERATING the
backhoe:
1. BE SURE the area is clear of
underground utilities or other
hazards
2. POSITION a barricade
around the work area.
3. PROVIDE adequate front
end weight to counter-balance
the tractor at all times.
20% of the total tractor.
Bucket
Boom Safety Lock
Stabilizer Cylinder
Sub Frame
Figure 1
7
DIRECTIONS: The terms right, left, front and back CONTROLS
shall be determined from the position of the operator
The backhoe has two major control levers plus the
when seated in the operating position on the backhoe.
stabilizer control levers. These controls are located
on the control panel directly ahead of the operator.
ENGINE SPEED
See Figure2. The following is a list of the controls,
The speed at which the backhoe operates is partwith the function of each, reading from left to right.
ially dependent on engine RPM. Use a moderate
engine speed to start and increase it as your
1. Boom/Swing: Push lever forward, the boom
experience permits. Refer to "DIMENSIONS AND
moves down, away from the operator. Pull lever back,
SPECIFICATONS" on Page 42 for hydraulic flow volume
the boom moves up, toward the operator.
requirement. When powering from tractor systems with
higher output, reduce engine RPM to obtain acceptable
The Boom/Swing Control lever has an added "float"
backhoe operating speed.
function. A detent or stop should be felt when the
lever is pushed forward to move the boom down.
Pushing the lever forward more will overcome the
detent and cause the boom to float, or move down
or up freely, depending on the forces acting on it.
when the lever is released it should return to the
center, neutral position.
Move lever to the left, the backhoe swings to the left.
Move lever to the right, the backhoe swings to the right.
By moving the lever to one of the intermediate positions,
the boom can be swung left or right at the same it is
being raised or lowered, performing the two operations
simultaneously.
SWING LEFT AND LOWER the boom by moving the
control lever forward and to the left.
SWING LEFT AND RAISE the boom by moving the
control lever back and to the left.
Figure 2
Safety Swing Lock Pin
Boom Safety Lock Pin
Goes Here
Figure 3
8
In general, the direction of movement of a control
lever corresponds to the movement of the operating
member.
1. SWING RIGHT AND LOWER the boom by moving
the lever forward and to the right.
2. SWING RIGHT AND RAISE the boom by moving
the lever forward to the right.
Operating the Backhoe
CAUTION
3. Left Hand Stabilizer: Push lever downward, the LH
stabilizer lowers. Pull lever upward, the LH stabilizer
raises.
To avoid possible injury, observe the following
safety rules WHEN OPERATING the backhoe.
4. Right Hand Stabilizer: Push lever downward, the
RH stabilizer lowers. Pull lever upward, the RH
stabilizer raises.
1. DISENGAGE safety locks as shown in Figure 3
before attempting to operate the backhoe. Store
lock pins in holes provided in operator platform.
5. Crowed/Bucket: Push lever forward, the dipper
stick moves out, away from the operator. Pull lever
back, the dipper stick moves in, toward the
operator.
2. OPERATE from the backhoe operator's seat only.
3. LOWER the stabilizers until the rear of the tractor
is totally supported by them. NOTE: Rear tires
should not come up off of the ground.
See diagram on Page 11.
Move lever to left, the bucket curls in. Move lever to
right, the bucket extends out.
4. DO NOT dig near the stabilizers.
By moving the lever to one of the intermediate positions,
the dipper stick can be extended or retracted at the
same time the bucket is being loaded or dumped.
5. DO NOT touch overhead wires with any part of
the backhoe.
EXTEND AND LOAD the bucket by moving the lever
forward and to the left.
6. DO NOT attempt to raise the tractor off the
ground or move the tractor forward or backward
using the backhoe dipper stick or bucket.
RETRACT AND LOAD the bucket by moving the
lever back and to the left.
EXTEND AND DUMP the bucket by moving the lever
forward and to the right.
7. DO NOT lose stability by swinging the bucket
Down hill when positioned on a slope.
8. DO NOT lower the backhoe boom using the
"float" function. It will freefall, and could result in
injury to bystanders or damage to the backhoe.
RETRACT AND DUMP the bucket by moving the
lever back and to the right.
The two operations of the room lever, combined
with the two operations performed by the bucket
and dipper stick control lever, provide four simultaneous
operations from the two levers, keeping cycle time to a
minimum.
Location: Back Of Control Panel
9
It is not difficult to become an efficient operator.
Control lever operating decal is located on back of
the control panel. Study this decal. It will assist you
in becoming familiar with the controls.
Smooth, light handling of the controls will result in
the most efficient backhoe operation.
Operate the backhoe control levers to become
familiar with their speed and movements. The
engine speed and the size of the hydraulic system
will determine the speed of cylinder operation.
When powering from tractor systems with higher
output than required, reduce engine RPM to obtain
acceptable backhoe operating speed.
Swing the boom several times to practice
controlling the speed of swing. Do not operate the
swing more than 45 each way for the first few
times, then gradually increase the arc.
This dual operation of controls will speed and
simplify the digging operation. Normally the two
or more movements will not be equal or even
simultaneous, but as the pressure within the
cylinders changes, and the resistance on an
operating member of the hoe lessens, it will begin
to move. It is balancing the force of one member
against the other.
NOTE: Actuating the bucket is the key to powerful
digging. Operating the crowd and bucket controls
simultaneously will insure a full bucket and
prevent waste motion and time.
Transporting the Backhoe:
IMPORTANT: To prevent serious damage to the
tractor, read and follow the instructions on the
following decal:
IMPORTANT: To avoid damage to the backhoe, do
not slam swing unit into the rubber bumpers.
The boom "float" function may be used during digging
to eliminate down pressure when cleaning the bottom
of a trench. The primary purpose of the boom "float"
function is to protect the operator from serious injury in
the event that the backhoe or tractor hitch would fail.
Best results are obtained by digging near the center of
the swing arc so material can be dumped on either side.
Best results are obtained by digging near the center of
the swing arc so material can be dumped on either side.
As the operator becomes more familiar with the operation of
the backhoe, it will be common practice to operate two controls
at one time. For ex example, with the bucket extended and the
dipper stick extended, the lift control and crowd control can be
Location: Right Side of Boom
operated together to bring the bucket toward the operator with
down pressure on it.
As the dipper stick approaches the operator, the crowd and
bucket controls can be operated to close the bucket and trap the
material. At the end of the stroke, the lift and crowd controls are
operated to move the load up and away from the operator to
save time in clearing the excavation.
10
Set the stabilizers to remove weight from the rear wheels. The wheels are to remain touching the
ground as this provides for the widest stabilizer stance and the lowest center of gravity. Raising
the wheels off the ground will not only reduce stability and digging depth, but will perform and
impose unnecessary stress
11
General Operations
FILLING THE BUCKET
Control the bucket attitude throughout the
digging cycle to keep teeth at the proper angle for
best penetration. This will minimize dragging and
scraping through the ground.
When digging in hard-packed soil, bucket
penetration can be increased by applying down
pressure with the boom while crowding in and
curling the bucket. If the crowed action "stalls" it
may be necessary to apply lift occasionally during
the digging cycle to correct the bucket depth.
As the pile is approached, dump the bucket. When
the bucket is empty, the dipper stick and bucket
are in position to resume digging upon return to
the trench.
IMPORTANT: Avoid constant jarring or hammering
type contact between the spoil pile and the loaded
bucket, as this may cause premature wear to the
backhoe pins and bushings.
TRENCHING BETWEEN A BUILDING AND
OPEN EXCAVATIONS
Start the trench at the building. Trench out
halfway to the excavation. Then start trenching
from the excavation to the first trench. Dig toward
the first trench until there is just enough room to
move the unit out between the two trenches.
Position the unit so the backhoe swing post is over
the centerline of the trench connection. Dig with
the backhoe at extreme swing positions, and in as
To obtain a cleaner trench and avoid the buildup close to the stabilizers as possible. Pile the spoil
on the opposite side of the trenches.
of material directly in front of the backhoe,
crowed out and completely curl the bucket while
starting to lift it from the excavation. In this way,
excess material will fall back into the excavation.
Position the unit forward with the lift and crowed
levers so the two trenches can be connected. Pile
DUMPING THE BUCKET To dump the bucket at the spoil on the opposite side of the trench.
the end of the digging cycle, lift the bucket clear
of the trench while crowding it out and swinging it
to the spoil pile.
12
General Operations
SIDE SLOPE EXCAVATING OR TRENCHING
Dig with backhoe uphill whenever possible.
MISCELLANEOUS
When finishing straight walls or bell holes in sandy
soil, use a platform under the rear tires and
stabilizers. The platform distributes the load over a
larger area and lessons the possibility of a cave-in.
The platform also tends to keep the unit from
creeping rearward if hard digging is encountered.
Level the backhoe on slops with the stabilizers to
dig plumb trenches, or use the backhoe or loader
to cut a level slot for the uphill wheel and stabilizer.
Pile the spoil from the slot on the low side.
FINISHING STRAIGHT WALLS
Finish the far wall by crowding out while forcing the
bucket down from the boom. Actuate the bucket
(curl out) to keep the bottom of the bucket vertical.
When on the side of a steep slope, cut a level
surface along the uphill side of the trench with the
loader.
Pile the spoil of the cut downhill. When digging,
pile the spoil of the trench uphill.
To finish the near wall, lift up and crowd in. Keep
the edges of the bucket horizontal.
Dig field trenched progressively. As soon as one
trench is completed, have the workmen lay the tile.
Start the next trench, using the spoil to fill the
previous trench.
BACKFILLING
Backfill by lifting the bucket over the spoil pile and
then crowding in. Pull both the crowd and lift levers
for smooth, even backfilling.
IMPORTANT: Do not backfill by using the swing
circuit and dragging the bucket sideways. Doing so
can cause damage to the dipper stick boom
swing cylinders or mainframe.
13
Service
CAUTION
To avoid possible injury, observe the following safety rules WHEN SERVICING the backhoe.
1. ENGAGE safety locks as shown in figure 1 & 3 before servicing the backhoe.
2. DO NOT oil, grease or adjust the backhoe while it is in motion.
3. DO NOT change any backhoe relief valve setting. They are factory set for best performance and
safety.
4. ESCAPING FLUID under pressure can have sufficient force to penetrate the skin and cause serious
injury. Be sure to relieve all pressure before disconnecting lines. Be sure all connections are tight and
that lines, pipes and hoses are not damaged before applying pressure to the system.
5. FLUID ESCAPING from a very small hole can be almost invisible. Use a small piece of cardboard or
wood not your hands - to search for suspected leaks.
6. SEE A DOCTOR AT ONCE if injured by escaping fluid. Serious infection or gangrene can develop if
proper medical treatment is not administered immediately.
7. PROTECT YOUR EYES - Wear safety glasses. Guard against injury when driving connecting pins or
performing any repair in which particles can chip from work piece or striking tool.
BEGINNING OF SEASON AND AT TIME OF INSTALLATION.
Remove all protective covering.
On the PTO pump contained system, maintain the reservoir oil at the proper level by looking at the oil
gauge. When checking oil level, the backhoe should be extended to full reach with the bucket rolled
back and resting on the ground. All cylinders are retracted except for the boom cylinder. Do not overfill:
oil may be forced out of the breather cap.
Change PTO Reservoir Hydraulic Oil and Filter every 200hrs, or earlier if necessary.
Fill PTO Pump Transmission Gear Box with about 4 oz of 85/90 W Gear Oil
Fill Reservoir with: SAE 10W40 engine oil with API “SF/SG” classification in northern climates. AW32
Fill Reservoir with: SAE 40W engine oil with API “SF/SG” classification in southern climates or AW42
Or Reservoir oil should be a all purpose tractor hydraulic oil, or AW32/AW42 is another good choice.
Check hydraulic hoses for deterioration and replace, if necessary.
Lubricate all grease fitting and oil handle linkage. Check hydraulic system for loss of fluid and, if
necessary, fill to proper level, or replace it if contaminated. Tighten all loose bolts, nuts and set screw.
Inspect bucket teeth and, if necessary, sharpen or replace them.
Operate the backhoe slowly for a short time before full time operation, to get used to the controls, and
also checking for hydraulic leaks, before placing the unit under full load.
14
Bleeding Backhoe Hydraulic System
If the hydraulic hoses have been disconnected from the backhoe or tractor, all trapped air must be
removed after the hoses are connected. Start tractor engine and operate backhoe through all
movements fully, several times, to purge the system of air.
Hydraulic System Hoses
Oil leaks in the pressure side of the system can be located by carefully inspecting the external area of
the hoses and fittings.
Check the return side of the system for leaks by examining the oil in the reservoir. If air is being
drawn into the system, the oil will contain air bubbles and appear to foam.
When tightening connections, always use two correct size wrenches.
IMPORTANT: Do not over-tighten fittings. Make them just tight enough to eliminate leaks.
NEVER use Teflon tape on pipe thread fittings. Always use a paste type sealer.
Hoses on any backhoe are very severely worked and will fail in time. Examine them regularly and
replace any that show signs of failure. Pay careful attention to the routing of hoses so they can move
fully and freely without kinking, and cannot be pinched or cut by any part of the backhoe.
The bucket tooth points are self-sharpening and will require little attention; however, these points on
the bucket shanks can be replaced when they become badly worn or broken.
A tooth points can be removed from the welded tooth shank by hammering at "A" (Figure 5) on the
tooth point or by driving a chisel at "B", just between the tooth point box section and the tooth shank.
Install the new point and anchor it to the shank by peening at the location shown.
If a tooth shank breaks off, becomes damaged or lost so that it cannot hold a tooth point, a new shank
should be welded to the bucket in its place. The newer Style are now bolted on.
Tightening Nuts and Bolts
Periodically, check to be sure all bolts and nuts are tight. See torque chart, page 43.
Check all pivot pins for cotter pins, washers and retainers; if missing, replace.
Lubrication
Economical and efficient operation of the backhoe is dependent upon regular and proper lubrication of
all moving parts with a quality lubricant.
All parts fitted with grease fittings should be lubricated with a good quality chassis lube type grease. If
any grease fittings are missing, replace them immediately. Clean all fittings thoroughly before using
grease gun.
15
Lubricate all grease fittings at least twice daily, once at the beginning of operation and again
approximately halfway through the work day.
Lower stabilizers to the ground, extend dipper stick and bucket and lower boom so bucket rests on the
ground as shown in Figure 6. Refer to these illustrations for the location of all grease fittings.
*IMPORTANT: Before greasing boom to swing frame pivot (*) shown in Figure 6, raise boom and install
boom safety lock pin shown in Figure 1.
The following locations should be oiled with SAE 30 oil:
A. Stabilizer Pivot Pins
B. Control Handle Linkage
C. Seat Bracket Pivot
Hydraulic Oil: Most any all purpose Tractor Hydraulic oil can be used, AW32 / AW42 is good.
IMPORTANT: Avoid excessive greasing. Dirt collects on exposed grease and increases wear greatly.
After greasing, wipe off excessive grease from fittings.
①
①
①
①
①
①
①
①
①
①
①
①
Figure 6 –Lubrication Points
16
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INSTALLATION AND REMOVAL
Tractor Preparation
1. Remove rockshaft center link.
2. Remove the sway links, lift links, and draft links.
3. Remove drawbar.
The backhoe can be self-assisting during the installation and removal procedures.
Installing an Assembled Backhoe on a Tractor
IMPORTANT - Consult the "General Operation" section for proper use and terminology when installing
this backhoe.
1. Center sub frame between tractor rear tires and carefully back over sub frame until hydraulic hoses
are close enough to connect.
2. Stop tractor and set park brake.
3. Disconnect tractor pressure line hose from tractor power beyond hose at rear of tractor. Connect
backhoe pressure line hose to tractor pressure line hose. Connect return hose of backhoe to tank line of
tractor, located on right hand side of tractor, under rockshaft arm.
DANGER
The only time the backhoe should be operated from a position other than the operator's seat is
during the backhoe installation and removal process.
•
•
Engage Swing Lock Pin
Always stand away from the backhoe stabilizer legs and along side of the tractor rear tires.
CAUTION
Route hydraulic hoses carefully to prevent damage.
4. Start tractor, set throttle at low idle, remove parking brake.
5. Using backhoe hydraulics in the boom and stabilizer leg circuits, raise sub frame enough to align
hooks on sub frame with Tractor lower 3-point hitch connection points.
IMPORTANT - As you raise unit, you will need to alternate back and forth between the boom and
stabilizer circuits. This procedure is needed to keep the front of the sub frame (under the loader mount)
as close to the ground as possible.
6. Roll or drive tractor back until hooks are fully engaged into lower 3-point hitch connection points.
7. Making sure that the Lock Pins and pivoting latches are out of the way in the front of the sub frame,
pivot sub frame up into the Loader Mount Weldment.
Again, this is accomplished by using the boom hydraulics.
8. Shut off tractor and engage parking brake.
9. Secure pivoting latches using Lock Pins and Hair Pin Clips.
Testing Backhoe Hydraulic Hook-Up
1. Start the tractor.
2. Exit the tractor.
17
3. Sitting in the backhoe operator's seat raise and lower the stabilizer legs and extend and retract the
dipper stick.
4. Exit backhoe, stop engine, and check hydraulic fluid level in tractor.
Removing Assembled Backhoe from Tractor1. Start tractor engine, engage park brake, place throttle in low idle position, and exit tractor.
2. Remove Swing Lock Pin from its storage location and install in backhoe.
3. Remove Lock Pins and Hair Pins Clips from front of sub frame. Pivot latches forward to disengage
from loader mount.
4. Pivot sub frame down until the sub frame clears the Loader Mount Weldment.
Again, this is Accomplished by using the boom and stabilizer circuit hydraulics.
5. Flip up pivoting latches and reinstall Lock Pins and Hair Pin Clips for storage Purposes.
6. Continuing to use the boom and stabilizer circuit hydraulics, raise sub frame slightly at the Tractor
lower 3-point hitch connection points to take the sub frame weight off of the pins.
IMPORTANT - Watch that hydraulic hoses to backhoe are not kinked or pulled tight.
7. Drive tractor ahead just enough (5" to 6") to clear sub frame hooks from the Tractor lower 3-point
hitch connection points.
8. Again, using boom and stabilizer circuit hydraulics lower backhoe and sub frame to the ground.
9. Shut off tractor, engage parking brake, then disconnect hydraulic hoses from backhoe.
10. Reconnect tractor pressure line hose to tractor power beyond hose, located just above PTO master
shield.
NOTE: For long term storage, coat exposed cylinder rods with grease.
Stabilizer Pads
The backhoe is supplied with flip-over stabilizer pads as standard equipment. They are suitable for
most backhoe work and generally are all that is ever required. However, Street pad kits are available
as an option. This kit bolts to the standard pads and increase the versatility of the backhoe. See figure
10.
Hydraulic Trouble Shooting
The trouble shooting material presented in this section is offered as a guide to diagnosing probable
causes and remedies for general operational problems. Match your problem with the typical problem
examples given, and note the numbers given for the possible cause. These numbers correspond with
the possible cause and correction paragraphs that follow.
NOTE: When using the following chart, if it is decided that an overhaul of components or pressure
adjustments are necessary to correct malfunctioning, it is recommended that your dealer make these
repairs. He is equipped to do this work.
18
WARNING
Escaping hydraulic / diesel fluid under pressure can penetrate the skin causing serious injury.
Do not use your hand to check for leaks. Use a piece of cardboard or paper to check for leaks.
Stop engine and relieve pressure before connecting or disconnecting lines.
Tighten all connections before starting engine or pressurizing lines.
If any liquid is injected into the skin, obtain medical attention immediately or gangrene may result.
Problems and Possible Causes
1. Machine fails to operate when started initially -1, 2, 5, 7, 16, 24
2. Machine loses power after operating satisfactory initially - 1, 8, 10, 14, 16, 24
3. Loss of power in lift or crowd cylinder, but other cylinders function properly - 23, 25, 30
Problems and Possible Causes, Continued
4. Loss of power in any one cylinder including lift and crowd - 8, 9, 10, 11, 12, 13, 23, 25, 26
5. Loss of power in swing cylinders, but other cylinders functioning property - 8, 9, 10, 11, 12, 13, 23,
24, 26
6. Maximum swing action cannot be obtained - 12, 15.
7. Slow operation of machine (lack of power) all cylinders - 1, 4, 6, 14, 16, 24
8. Spongy or jerking action of cylinders and/or noisy operation - 1, 3, 4, 5
9. Lift, crowd or bucket cylinders drop under load when control spools shifted from neutral - 28, 30
10.Load drops or settles - 8, 10, 13, 26, 28
11.Leaky cylinders - 10, 11, 12, 13
12.Leaky valve - 8, 16, 17, 29
13.Sticky valve spool - 17, 20, 21, 22
14.Unable to push valve spool in - 17, 18, 20, 21, 22
15.Spring centered spools do not return to neutral- 17, 18, 19, 20, 21, 22
Causes and Corrections
1. Low oil supply in reservoir - fill to proper level.
2. No oil supply to machine - oil is not being diverted from the prime mover hydraulic system.
Be sure that the proper controls are actuated on the prime mover.
3. Air in system - bleed all circuits of air by operating machine at maximum oil flow and through
full movements.
4. Oil viscosity too heavy, or oil is not at operating temperature - use recommended hydraulic fluid.
Run machine until oil reaches operating temperature.
5. Pump not running - check pump drive to be sure it is engaged.
6. Insufficient pumping - advance engine throttle.
7. Improper hose connection - IMPORTANT: Be sure inlet and return hoses are hooked up correctly
Improper hook-up will result in damage to the backhoe valve.
8. Loose oil line connections, leaks in line or broken lines - tighten all hose connections and replace and
damaged O-ring at leaking O-ring fittings. Check and replace any damaged hoses and lines.
9. Restrictions in oil line - check and replace any damaged hoses and lines. Check for pinched hoses.
10. Oil is bypassing cylinder piston, scored piston, worn piston packing, or defective piston assembly
19
replace
or rebuild the cylinder; replace damaged parts.
11.Scored piston rods and worn rod guides in cylinder - replace or rebuild the cylinder; replace
damaged parts.
12. Bent piston rod in cylinder - replace or rebuild the cylinder; replace damaged parts.
13. Worn or damaged rod seals on cylinder; external repack cylinder. Rebuild cylinder, replacing
damaged parts as necessary.
14. Diverter valve on prime mover leaking externally or bypassing oil internally through valve to
reservoir diverter valve may need rebuilding or replacing.
15. Something jamming the swing linkage – remove interference.
16. Excessive back pressure - relief condition. May be restriction from outlet to reservoir.
17. Paint on valve spool; sticking valve spool or scored valve spool - clean valve spool. Binding is
usually caused from an over tightened plug, mounting bolt, fitting in valve body or tie rod bolt. If a
plug or fitting in the valve body is leaking, do not over tighten in an effort to stop leak. This will
distort body casting and cause spools to bind. Instead, the plug and fitting should be removed from
valve body and be reconnected, using a new O-ring. Do not apply excessive pressure on mounting
bolts. The rods should be torqued to 20 ft./lbs. Never force spool, if binding occurs see item 30 at the
end.
18. Oil leakage past spool seal into spool cap remove cap. If it contains oil replace spool seal O-rings.
Check O-ring retainer to be sure it is flat. If it has been "belled" check for restriction from outlet to
reservoir of valve which would cause excessive back pressure. See item 30 at the end and item 9.
19. Broken return springs - replace springs, see item 30 at the end and Figure 11.
20. Bent spool - replace with new spool section. See item 30 at the end.
21. Foreign particles - clean system and valve.
22. Misalignment of control handle linkage – check linkage for binding condition.
23. Spool not moved to full stroke - check travel, should be 5/16" either way, or a total of 5/8".
See item 30 at the end.
24. Relief valve setting in backhoe control valve too low or defective - relief pressure will have to
be checked and corrections made. Backhoe system pressure is 2100 psi. Relief valve may
need cleaning and overhauling, or entire cartridge must be replaced. See item 30 at the end.
25. Overload relief valve in the control valve stuck open or malfunctioning - clean relief carefully
but do not disturb its pressure setting as it cannot be field calibrated, or replace cartridge.
See item 30 at the end.
26. Worn control valve - replace the control valve.
27. Check proper in the control valve not holding clean check poppet(s) carefully, being sure that it
moves freely with good spring action and seats properly or replace. See item 30 at the end.
28. Damaged or worn spool seals - replace spool end seals, see item 30 at the end.
29. Ball in check valve is stuck or not seating properly - clean anti-cavitation valve carefully, being sure
20
that checks move freely and seat properly, or replace cartridge. See item 30 next.
30. Problems involving the control valve proper:
This valve is a precision device and is not intended for any extensive field adjustment or repair. Field
replacement parts are limited to seal kits, cartridges, valve sections and tie rods. Replacement of
these parts, the opening of check cavities and certain relief valve cavities to examine for trapped
dirt, or the resetting of the main relief valve with the use of good pressure gauge, should be
referred to qualified service personnel.
Dirt and shreds of packing material are the usual causes of valve malfunction. Be sure the reservoir
oil supply is kept clean and only factory supplied packing’s are used in cylinder repair. Everything
must be clean and free of dirt during the oil line removal and replacement, and during any cylinder
work.
Pages 19 and 20, Valve Repair-disassemble explain the procedure to follow for valve repair.
The inclusion of this information and its use does not imply that the warranty will remain
effective on the valve if it is tampered with during the warranty period.
Replace Center Section Assemblies:
Note: For the purpose of these instructions we will consider the section containing the MAIN RELIEF
VALVE as the left side of the valve.
1. Remove control valve from the backhoe.
2. Thoroughly clean the exterior of the valve before beginning disassembly procedures.
21
3. Since the valve will be assembled in the same order, each section should be marked numerically
so that they can be reassembled in the same sequence.
4. Mount the valve vertically in a vise to facilitate disassembly and assembly.
5. Remove the 3 tie rod nuts from the right end section, using a thin-wall socket.
6. Valve sections can now be removed by sliding the sections along the tie rods.
7. Thoroughly clean the O-ring counter bores and the ground surfaces of each section. Place O-ring
seals, ordered as a kit, in proper counter bores. For better sealing it is recommended that all
O-rings,
used in the counter bores, are replaced with new parts.
8. Replace the sections on tie rods with the O-ring counter bores facing the right end of the valve. Be
careful replacing the sections so that the section O-rings are not moved from the counter bores.
9. When all sections are assembled on the tie rods, tighten the tie rod nuts equally to 20 ft. lbs . torque,
NO MORE - NO LESS, or spool may bind and stick.
Replacing Spool Seals:
Note: For the purpose of these instructions we will consider the control handle side of the valve as the
FRONT, and the opposite side as the BACK.
1. Remove control valve from the backhoe.
2. Thoroughly clean the exterior of the valve before beginning disassembly procedures.
3. At the BACK of the valve remove all bonnet assembly parts which are connected to the spool.
Keep parts in the order of disassembly. See Figure 11 for the parts involved in the make-up of the
bonnet assembly.
IMPORTANT: DO NOT remove the spool from the valve. The seals can be replaced externally. Prevent spools from
turning or moving by inserting a screw driver through the clevis slot, or by running a rod through the pin hole and
using the rod as a handle. DO NOT hold the spool with a wrench. This will destroy the finish.
4. At the BACK of the valve, remove seal retainer, back-up washer, and spool O-ring seal, or retaining
sleeve, bonnet O-ring seal and spool U-cup seal.
5. Thoroughly clean counter bores.
6. Install new seals:
A. Spring-Centered Bonnet Assembly Only: Lightly oil new O-ring seal. Slide O-ring seal over valve
spool and insert in seal counter bore. Replace back-up washer and seal retainer.
B. Float Bonnet Assembly Only: Replace retaining sleeve on valve spool. Lightly oil new U-cup seal.
Slide U-cup seal over valve spool being careful to orient seal as shown in figure 11. install new O-ring
seal in bonnet counter bore.
7. At the BACK of the valve replace bonnet assembly parts, reversing the order in which they were
disassembled in step 3. Use 12 ft. lbs. torque to tighten assembly screw on spring centered bonnet
assembly.
8. At the FRONT of the valve remove all parts connected to the spool (handle, linkage, etc.).
22
9. At the FRONT of the valve remove seal plate retainer, seal retainer, back-up washer and spool
O-ring seal.
10. Thoroughly clean counter bore.
11. Lightly oil new O-ring seal. Slide O-ring seal over valve spool and insert in seal counter bore.
Replace back-up washer, seal retainer, and seal plate retainer.
12. Reattach all parts connected to the spool (handle, linkage, etc.).
ASSEMBLY
Basic components for all models can be identified in Figure 12.
CONTROL VALVE SECTION
Typical Section for Actuate (Bucket) & Swing Circuits)
*Cv126 VALVE PART LIST for the BH6600 Control Valve
23
*CV556 VALVE PARTS LIST That Comes with the BH7600
24
General Unpacking
The backhoe has been partially disassembled and strapped to a skid for shipping purposes. Initial
installation on the tractor will require a hoist or other device capable of safely lifting the entire backhoe
from the skid. After the initial installation is complete, the backhoe can serve as its own erecting hoist,
by lowering stabilizers and bucket to the ground. Additional lifting devices will not be required for
normal removal and reattaching.
Assembly - Figure 12
IMPORTANT: Tighten all hardware to torque requirements specified in torque chart.
1. Remove the stabilizer assemblies and any miscellaneous items which have been fastened to the
skid and arrange conveniently. Reposition stabilizer cylinders from their shipping configuration (See
Fig. 12A), by assembling them into the Mainframe, using pins and hardware provided. Be sure cylinder
ports are pointed upward and hoses are routed above the cylinder to mainframe pivot pin connection.
See Fig. 12B.
CAUTION
DO NOT cut any strapping that fastens the backhoe mainframe and swing frame to the skid base at this time.
CAUTION
Be sure hoist being used is suitable,
has sufficient capacity and is in the
proper position. Do not allow anyone
under a backhoe member supported
by hoist.
2. Support boom(A) and dipper stick(B) with
hoist and remove boom transport lock pin. Lower
boom and manually extend dipper stick until it
rests on ground. Move control handle to "BOOM
DOWN" position as required to aid movement.
4. Attach Bucket Link (E) to Bucket, using same
hardware as listed for step #3.
CAUTION
Be sure hoist being used is suitable,
has sufficient capacity and is in the
proper position. Do not allow anyone
under a backhoe member supported
by hoist.
3. Remove plastic bag containing bucket pins from
backhoe. Attach Bucket (D) to Dipper stick using
one pin, two bolts, locknuts, pin retainers, and
washers as needed to take up gap under pin
retainers.
5. Reposition hoist on backhoe to prevent tipping
and raise Mainframe slightly. Remove all remaining
strapping and skid. Using caution to prevent tipping
raise Mainframe (G) approximately 10" and block
Mainframe and Swing Frame securely.
6. Attach Stabilizers (F) to Mainframe (G) using 7. Attach Stabilizer Cylinders (H) to stabilizers (F)
pins and hardware assembled to Stabilizers (F). using pins and hardware assembled to stabilizer (F).
8. Follow the Mount Kit Instructions section of the Operator's Manual. Check the installation carefully
and make sure that all members are correctly installed and securely fastened.
25
Figure 12
Packing may be different than below, as we are always trying to improve, to maximize space and
prevent damage during shipping.
Figure 12A
Figure 12B
HYDRAULICS and MOUNTING KITS
SUB FRAME & 3 POINT HYDRAULIC HOOK-UP TO THE TRACTOR & HYDRAULIC SYSTEMS
Warning! If the control valve is piped wrong you will damage the valve this will void the valve warranty.
If using your Tractor Hydraulics it must have a filter installed on the return system, if not, it will void any
warranty. Please contact your dealer for help. The factory installed PTO pump with reservoir does not
come with a check valve, a check valve is only needed when the hydraulic lines are connected directly
to the tractor hydraulic system. Hose connections maybe different then shown, be sure to check them.
26
Hoses for the Tractor Hydraulic system
JM354 Hydraulic Pump
Oil Fill & Vent Plug
Use 90 Gear Oil
Drain Plug
Factory Supplied PTO Pump
PTO- Gearbox Sight Glass
27
3 Point components and hookups
These parts come with your 3 point Backhoe, both models BH6600 / BH7600
Some parts may vary in size or length for each model.
Top Link
Attaches to BH
Frame
3 Point Kit above, shown below
assembled on a JM254LE Tractor
Shown with optional PTO pump and reservoir.
3 Point attaching point on a JM254LE
3 Point Shown Mounted on a Mahindra Tractor
Hose Kit supplied without PTO pump all fittings are JIC
28
ATTACHING KIT INSTRUCTIONS
3-POINT HITCH LINKAGE & MOUNT KIT & HYDRAULIC HOOK-UP
General Description
Mounting and hydraulics kits include two hoses which Can be used to connect the backhoe to the tractor
hydraulic system. Additional hydraulic com-ponents or kits will be required to complete the hook-up to
the tractor hydraulic system. Refer to the Hydraulic Hook-up section for futher information. Pumps and
reservoir kits are available as options.
The backhoe is mounted on the tractor lower link arms and an adjustable upper link. A set of stabilizer
arms is included. They bolt from the adjustable upper link to the backhoe
mainframe, locking the hoe rigidly in one position.
IMPORTANT: Tractor lower links must be kept free of lifting forces at all times after
installation of the attaching kit, by keeping tractor quadrant lever in the lowered position.
IMPORTANT: If the 3-point kit is to be used with a PTO & Reservoir Kit, the Reservoir Tank and it’s fittings
should be installed before proceeding with the 3-Point installation, this might be done at the factory depending on how
purchased.
3-POINT HITCH LINKAGE ASSEMBLY (Refer to Figures 13, 14 below, page 30 )
IMPORTANT: Tighten all hardware to the torque requirements specified in the torque chart.
WARNING
To prevent bodily injury, do not operate backhoe unless Lower Link Weldments(17,18) are
properly installed and adjusted. Failure to do so may result in backhoe being thrust upward,
crushing operator against cab or ROPS.
1. Use hoist to raise the backhoe mainframe so that the boom pivot pin is approximately 12”(BH6600),
or 14” (BH7600), off the ground.
2. Back tractor close to the backhoe. Connect tractor lower link arms to lower link mounts at position “C”
Figure 13, using two L-pins(4), two cotter pins, and two snap pins (7) as shown in Figure 8.
3. Secure upper bar(16) between upper braces(15) Using M20*2.5p*90 bolt(22), lock washer(20) And
nut(21).Use hoist to raise or lower backhoe slightly until a hole in the upper bar aligns with a hole in the
upper braces.
4. Attach RH lower link weldment (18) and LH lower link weldment(17) to backhoe mainframe using
M20*2.5p*50 bolt(24), lock washer(20), and nut(21).
5. Align RH and LH link weldment(17,18) with a hole in the upper bar/brace assembly, as close to the
tractor as possible. Use M20*2.5p*110 bolt(23), lock washers(20) and nut(21). You may need to return
to Step 4 and readjust upward or downward the bolt connection.
6. Remove backhoe from the tractor.
7. Tighten all hardware at this time. Check your installation very carefully to be sure all members are
correctly installed and securely fastened.
7A. If using optional PTO pump and Reservoir Kit proceed to that section prior to remounting the backhoe
onto the tractor.
8. Connect hoses from the backhoe control valve to the tractor hydraulic system as described in
“Hydraulic
hook-up.” Section, prior to remounting the backhoe onto the tractor.
29
Figure 13
Figure 14
30
BH6600 / BH7600 JM254 JM354 Frame mount parts
JM254 Rear Frame Bracket
JM354 Rear Frame Brackets
Frame Brace
General Description
Tractor will require setup, please consult your backhoe safety section for proper ballasting and
31
other important safety precautions.
IMPORTANT: Remove tractor Upper 3-point Arm and Lower Draft Arms from tractor before
proceeding.
IMPORTANT: Tighten all hardware to the torque requirements specified in the torque chart.
IMPORTANT: Some hardware on the sub frame has been factory preassembled for ease of shipment.
This hardware must be loosened to ease initial assembly of kit to tractor and backhoe.
IMPORTANT: Some tractor or loader mounting hardware will be discarded and replaced by
components in the backhoe mounting kit. Please read manual carefully, if loader and mount kit.
Please read manual carefully, if loader and mount kit have already been installed, remove loader.
Some of the loader mount kit hardware may need to be loosened, to ease backhoe mount kit installation
Adjustment of Sub frame Weldment (less backhoe) when Installed on Tractor with Loader Mount
1. Lift and slide hooks located on Sub frame Assembly into Tractor lower 3-point hitch connection
points.
2. Remove Lock Pins (04) and Hair Pin Clips (07). Pivot assembly up and into Loader Mount Weldment.
Secure to Loader Mount Weldment using Lock Pins (04) and Hair Pin Clips (07).
Tighten and torque all hardware that has been loosened, reinstalled, and installed up to this point.
Remove sub frame assembly from tractor.
Sub frame Assembly to Basic Backhoe
1. Install sub frame assembly to basic backhoe using two M20*2.5P*50 bolts (12), Φ20 lock washers
(03), and nuts (14). See figure 13 and figure 14.
2. Assemble Braces (02) to sub frame using two M20*2.5P*50 bolts (12), Φ20 lock washers (03), and
nuts(14). Install Braces to backhoe mainframe using four M20*2.5P*50 bolts (12), Φ20 lock washers
(03), and nuts (14). See figure 13 and figure 14.
3. Tighten and torque all hardware.
4. Using a hoist on backhoe to prevent tipping. Raise backhoe slightly to remove blocking, then lower
entire unit to the ground. Block as required.
5. Proceed to the "hydraulic Hook-Up" section of your backhoe Operator's Manual.
MOUNT KIT ASSEMBLY
Tractor will require setup, please consult your backhoe safety section for proper ballasting and other
important safety precautions.
IMPORTANT: Remove tractor Upper 3-point Arm and Lower Draft Arms from tractor before proceeding.
IMPORTANT: Some hardware on the sub frame has been factory preassembled for ease of shipment.
This hardware must be loosened to ease initial assembly of kit to tractor and backhoe.
IMPORTANT: Tighten all hardware to the torque requirements specified in the torque chart.
IMPORTANT: Some tractor or loader mounting hardware will be discarded and replaced by components
in the backhoe mounting kit. Please read manual carefully, if loader and mount kit. Please read manual
32
carefully, if loader and mount kit have already been installed. Some of the loader mount kit hardware
may need to be loosened, to ease backhoe mount kit installation.
Figure 15
Figure 15a
Figure 15b
33
Hydraulic Hook-Up
IMPORTANT - Follow instructions carefully when connecting backhoe to tractor hydraulic system.
The decal shown below is located on the Left-Hand toe shield.
Installing Backhoe Hydraulic Hose Lines –
IMPORTANT - Improper hydraulic hook-up can cause serious damage to backhoe control
valve or other hydraulic components. This is not covered under warranty.
Inlet Line (HP Pressure to the control valve inlet)
Note: Place a container under INLET port to catch trapped oil.
1. Remove Valve Cover from backhoe.
2. Attach to the left side of the backhoe control valve, the 48-inch hydraulic hose with hose sleeve, dust
cap and male coupler to the INLET port on the valve. Secure hose sleeve with plastic tie near male
coupler.
CAUTION
Hose Sleeves are installed to help protect the backhoe operator from escaping fluid under pressure. If
it become damaged or lost, replace hose sleeve and plastic tie straps immediately.
Outlet Line (Return to the pump return or reservoir)
Note: Place a container under OUTLET port to catch trapped oil.
1. Attach to the left side of the backhoe control valve, the long 90 degree adapter union, the 48 inch
hydraulic hose, Straight Adapter Union, Dust Plug, and female coupler to the OUTLET port on the valve.
2. Replace Valve Cover.
NOTE: Coupler Noses are physically larger than Coupler Nose. Coupler Body is physically larger than
coupler Body. This will insure proper hydraulic coupling of backhoe to tractor during the installation
process of the backhoe to tractor. If in doubt contact your dealer.
Installing Hydraulic Hose Lines to Tractor
IMPORTANT - Improper hydraulic hook-up can cause serious damage to tractor hydraulic components.
Rerouting Power Beyond Line (to Tractor Rockshaft)Note: Place a container under tractor loaded mid-mount valve to catch trapped oil.
1. Disconnect lower hose from the 90-degree fitting located at the front of loader mid-mount valve
located on the right hand side of the tractor.
2. Reroute hose back under the center of the tractor. Direct it rearward on the left hand side, to the
back of the tractor and lay it over the top of the left hand rear axle casting. Make sure that hose
does not interfere with any lines or operational linkages.
3. Install Hose Sleeve, Straight Adapter Union, and Male Coupler to hose. Secure hose sleeve with
34
plastic tie near male coupler.
4. Using heavy-duty plastic tie secure hose assembly to area near top of PTO shield.
CAUTION
Hose Sleeves are installed to help protect the backhoe operator from escaping fluid under pressure. If
it becomes damaged or lost, replace hose sleeve and plastic tie straps immediately.
Loader Valve Tank Port Line (Return)
1. Disconnect hydraulic hose from right hand side of rockshaft housing. Hose is located just below right
hand rockshaft arm.
2. Install Tee Fitting, Straight Adapter Union on right hand side of rockshaft housing. See Figure 16.
3. Reconnect and tighten hydraulic hose that was removed in step 1.
Loader Valve Pressure Line (from loader power beyond port)
1. Install the 86-inch hydraulic hose to the 90-degree fitting located at the front of loader midmount
valve located on the right hand side of the tractor.
2. Route hose back under along the right hand side of the tractor. Direct it rearward on the right hand
side, to the back of the tractor and lay it over the top of the right hand rear axle casting. Make sure
that hose does not interfere with any lines or operational linkages. Secure hose along its route with two
heavy-duty plastic ties.
3. Install Hose Sleeve, Plastic Tag, 90-degree Adapter Union, and Female Coupler to hose. Secure hose
sleeve with plastic tie near adapter union.
4. Make sure that all hydraulic connections made to the tractor are tight and leak free.
Continue with Installation and Removal section of the Operator's Manual.
Valve Shown is on the BH7600
Valve Low Pressure Outlet
Valve High Pressure Intlet
Figure 16
35
Valve Shown is used on the BH7600
Both the BH6600/BH7600 are piped JD style, but can be changed to Cat Style, ask your dealer for help.
BUCKET
DIPPER
Stabilizers Right/Left
SWING
BOOM Down/Up
Figure 16a
Factory Supplied PTO Pump if purchased.
Hose Kit Hose Kit if no PTO pump
36
H. Specification
MODEL
BH6600
BH7600
7'0"
7'7"
6'11"
7'4"
B. Swing Arc
180
180
C. Loading Height (bucket at 60 )
4'9"
5'3"
D. Reach from Center Line of Swing Pivot
9'0"
9'8"
E. Transport Height (maximum)
5'4"
5'11"
F. Bucket Rotation
172
172
G. Loading Reach (bucket at 60 )
3'2"
3'8"
H. Transport Overhang
3'6"
4'0"
I.
2'9"
3'0"
6'11"
6'11"
4'4"
4'4"
Bucket Cylinder Digging Force
2450 lbs
2840 lbs
Dipperstick Cylinder Digging Force
1250 lbs
2005 lbs
Shipping Weight (less bucket)
(654 )lbs
(875 )lbs
Hydraulic Volume Requirements
4 to 5 GPM
5 to 6 GPM
Hydraulic Pressure Requirements
2250 psi
2250 psi
18 - 35 HP
25 - 45 HP
Maximum Digging Depth
A. Digging Depth (two foot flat bottom)
Undercut
J. Stabilizer Spread, down position
K. Stabilizer Spread, up position
Recommended Tractor HP Requirements
37
REGULAR DUTY DEEP PROFILE BUCKET PARTS BREAKDOWN
FOR THE BH6600 6-1/2' BH7600 7-1/2' BACKHOE
Part
Number
Index
Number
1
2
3
1
2
3
1
2
3
Description
Regular duty Deep Profile Bucket - 12"
Tooth and Shank Assemblies for 12" Bucket
Tooth Point for 12" Bucket
Regular Duty Deep Profile Bucket - 14"
Tooth and Shank Assemblies for 14"Bucket
Tooth Point For The 14"
Regular Duty Deep Profile Bucket - 16"
Tooth and Shank Assemblies for 16"Bucket
Tooth Point for The 16" Bucket
Bucket Data: All Buckets are Interchangeable.
Bucket Width
SAE Capacity Heaped Capacity
12”
.50 Cu. Ft.
.64 Cu. Ft.
14”
.78 Cu. Ft.
1.04 Cu. Ft.
16”
.98 Cu. Ft.
1.33 Cu. Ft.
Shipping Weight
46lbs
52lbs
57lbs
TORQUE VALVES
Common bolts and nuts--Tightening Torque Plus/Minus 20%
Size
Grade 2
Grade 5
Grade 8
1/4-20 NC
70 in. lbs.
115 in. lbs.
165 in. lbs.
1/4-28 NF
85 in. lbs.
140 in. lbs.
200 in. lbs.
5/16-18 NC
150 in. lbs.
250 in. lbs.
350 in. lbs.
5/16-24 NF
165 in. lbs.
270 in. lbs.
30 ft. lbs.
3/8-16 NC
260 in. lbs.
35 ft. lbs.
50 ft. lbs.
3/8-24 NF
300 in. lbs.
40 ft. lbs.
60 ft. lbs.
7/16-14 NC
35 ft. lbs.
55 ft. lbs.
80 ft. lbs.
7/16-20 NF
45 ft. lbs.
75 ft. lbs.
105 ft. lbs.
1/2-13 NC
50 ft. lbs
80 ft. lbs.
115 ft. lbs.
1/2-20 NF
70 ft. lbs.
105 ft. lbs.
165 ft. lbs.
9/16-12 NC
75 ft. lbs.
125 ft. lbs.
175 ft. lbs.
9/16-18 NF
100 ft. lbs.
165 ft. lbs.
230 ft. lbs.
5/8-11 NC
110 ft. lbs.
180 ft. lbs.
260 ft. lbs.
5/8-18 NF
140 ft. lbs.
230 ft. lbs.
330 ft. lbs.
3/4-10 NC
150 ft. lbs.
245 ft. lbs.
350 ft. lbs.
3/4-16 NF
200 ft. lbs.
325 ft. lbs.
470 ft. lbs.
Note - See tractor instruction manual or your tractor dealer for tightening of metric bolts.
38
THUMB LINKAGE ASSEMBLY
(Refer to Figures 10 & 11)
39
SERVICE NOTES:
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40
Parts List:
BH6600 & BH7600 BACKHOE
CONTENTS
1. SUB FRAME PARTS
-------------------------------------------------- 42/43
2. STABILIZER PARTS
-------------------------------------------------- 44/45
3. BUCKET/DIPPER/BOOM PARTS --------------------------------------- 46/47
4. MOUNTING PARTS
--------------------------------------------------- 48/49
5. HYDRAULIC PARTS ---------------------------------------------------- 50/53
6. HYDRAULIC PARTS without PTO PUMP PARTS ----------------------- 54/55
7. THUMB PARTS --------------------------------------------------------- 56/57
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
LITW PRODUCT LIMITED WARRANTY
Sewoong Machinery Co. LTD(LITW) Warrants that each BACK HOE is free defects in
material and workmanship.
Home Owner 1 Year limited warranty: Commercial Use 3 month limited warranty.
LITW will repair or replace at LITW’s sole option any parts that are determined by LITW
To be defective in material or workmanship.
This Warranty is on the basis that the owner is responsible for bringing the Back hoe to the repairing
Dealer’s premises.
This warranty does not cover the following:
☞ Damage caused by accidents.
☞ Damage caused by misuse.
☞ Damage caused by abuse.
☞ Damage as a result of unauthorized modifications made by people other LITW.
☞ Normal wear and tear of the machine.
Normal services are not covered by this warranty
To the extent permitted by law, all implied warranties including warranties of merchantability
or fitness for a particular purpose and any other obligation on the part of the manufacturer and
Its Distributors and their dealers are specifically excluded.
☞ Please record your Backhoe in the space provided below.
Model:
Serial Number:
Selling Dealer:
Owner:
58
LITW BACKHOE
We Hope You Enjoy Your LITW Back Hoe
For any problems or service please contact your Dealer
Dealer Contact Information:
Edition 7/2007
59
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