Bush Hog Compact Excavator 665H User Manual
®
BUSH HOG  
BACKHOES  
Operator’s Manual  
MODELS 665H / 765H / 865H / 965H  
ASSEMBLY • OPERATION • MAINTENANCE  
$4.00  
801  
50034063  
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BACKHOES  
Operator’s Manual  
TABLE OF CONTENTS  
SECTION/PARA  
PAGE  
SECTION/PARA  
PAGE  
Beginning of Season .................................14  
Hydraulic System ......................................14  
Warranty ..................................................... 2  
Dealer Preparation Check List ................... 3  
Safety Procedures ...................................... 4  
Safety Decals ..............................................6  
Federal Laws & Regulations........................7  
General Operation ...................................... 8  
Controls .......................................................8  
Operating The Backhoe .............................9  
Transporting The Backhoe ........................10  
Placing The Stabilizers ............................. 11  
Filling The Bucket ..................................... 12  
Trenching .................................................. 12  
Backfilling ..................................................13  
Service ......................................................14  
Lubrication ................................................ 15  
Removal/Storage....................................... 16  
Stabilizer Pads ..........................................17  
Hydraulic Trouble Shooting........................17  
Valve Repair...............................................19  
Assembly....................................................20  
Attaching Kit Instructions........................... 21  
Hydraulic Hook-Up ....................................25  
Torque Chart ............................................. 30  
Power Beyond Kits.................................... 30  
PTO Pump & Reservoir............................. 35  
General Specifications...............................37  
RETAIL CUSTOMER’S RESPONSIBILITY  
UNDER THE BUSH HOG WARRANTY  
It is the Retail Customer and/or Operator’s responsibility to read the Operator’s Manual, to operate, lubricate,  
maintain, and store the product in accordance with all instructions and safety procedures. Failure of the opera-  
tor to read the Operator’s Manual is a misuse of this equipment.  
It is the Retail Customer and/or Operator’s responsibility to inspect the product and to have any part(s) repaired  
or replaced when continued operation would cause damage or excessive wear to other parts or cause a safety  
hazard.  
It is the Retail Customer’s responsibility to deliver the product to the authorized Bush Hog dealer from whom  
he purchased it, for service or replacement of defective parts which are covered by warranty. Repairs to be sub-  
mitted for warranty consideration must be made within forty-five (45) days of failure.  
It is the Retail Customer’s responsibility for any cost incurred by the Dealer for traveling to or hauling of the  
product for the purpose of performing a warranty obligation or inspection.  
UNDERSTAND SIGNAL WORDS  
DANGER: Indicates an imminently  
hazardous situation which, if not avoid-  
ed, will result in death or serious injury.  
This signal word is to be limited to the  
most extreme situations.  
WARNING: Indicates a potentially  
hazardous situation which, if not  
avoided, could result in death or  
serious injury.  
CAUTION: Indicates a potentially  
hazardous situation which, if not avoid-  
ed, may result in minor or moderate  
injury. It may also be used to alert  
against unsafe practices.  
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®
BUSH HOG  
LIMITED WARRANTY  
✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯  
Bush Hog warrants to the original purchaser of any new Bush Hog equipment, purchased from an authorized  
Bush Hog dealer, that the equipment be free from defects in material and workmanship for a period of one (1)  
year for non-commercial, state, and municipalities’ use and ninety (90) days for commercial use from date of  
retail sale. The obligation of Bush Hog to the purchaser under this warranty is limited to the repair or replace-  
ment of defective parts.  
Replacement or repair parts installed in the equipment covered by this limited warranty are warranted for nine-  
ty (90) days from the date of purchase of such part or to the expiration of the applicable new equipment war-  
ranty period, whichever occurs later. Warranted parts shall be provided at no cost to the user at an authorized  
Bush Hog dealer during regular working hours. Bush Hog reserves the right to inspect any equipment or parts  
which are claimed to have been defective in material or workmanship.  
DISCLAIMER OF IMPLIED WARRANTIES & CONSEQUENTIAL DAMAGES  
Bush Hog’s obligation under this limited warranty, to the extent allowed by law, is in lieu of all warranties,  
implied or expressed, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A  
PARTICULAR PURPOSE and any liability for incidental and consequential damages with respect to the sale or  
use of the items warranted. Such incidental and consequential damages shall include but not be limited to:  
transportation charges other than normal freight charges; cost of installation other than cost approved by Bush  
Hog; duty; taxes; charges for normal service or adjustment; loss of crops or any other loss of income; rental of  
substitute equipment, expenses due to loss, damage, detention or delay in the delivery of equipment or parts  
resulting from acts beyond the control of Bush Hog.  
THIS LIMITED WARRANTY SHALL NOT APPLY:  
1. To vendor items which carry their own warranties, such as engines, tires, and tubes.  
2. If the unit has been subjected to misapplication, abuse, misuse, negligence, fire or other accident.  
3. If parts not made or supplied by Bush Hog have been used in connection with the unit, if, in the sole judge-  
ment of Bush Hog such use affects its performance, stability or reliability.  
4. If the unit has been altered or repaired outside of an authorized Bush Hog dealership in a manner  
which, in the sole judgement of Bush Hog, affects its performance, stability or reliability.  
5. To normal maintenance service and normal replacement items such as gearbox lubricant, hydraulic fluid,  
worn blades, or to normal deterioration of such things as belts and exterior finish due to use or  
exposure.  
6. To expendable or wear items such as teeth, chains, sprockets, belts, springs and any other items that in the  
company’s sole judgement is a wear item.  
NO EMPLOYEE OR REPRESENTATIVE OF BUSH HOG IS AUTHORIZED TO CHANGE THIS LIM-  
ITED WARRANTY IN ANY WAY OR GRANT ANY OTHER WARRANTY UNLESS SUCH CHANGE IS MADE  
IN WRITING AND SIGNED BY BUSH HOG’S SERVICE MANAGER, POST OFFICE BOX 1039, SELMA,  
ALABAMA 36702-1039.  
✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯✯  
Record the model number, serial number and date  
purchased. This information will be helpful to your  
dealer if parts or service are required.  
MODEL NUMBER  
SERIAL NUMBER  
MAKE CERTAIN THE WARRANTY REGISTRATION  
CARD HAS BEEN FILED WITH BUSH HOG/  
SELMA, ALABAMA  
DATE OF RETAIL SALE  
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DEALER PREPARATION CHECK LIST  
665H - 765H - 865H - 965H BACKHOES  
BEFORE DELIVERING MACHINE - The following check list should be completed.  
Use the Operator’s Manual as a guide.  
❑ Machine properly assembled.  
❑ All safety decals readable (See decal page).  
❑ All bolts tightened to torque specifications given in the torque chart.  
❑ Machine operates properly.  
❑ Operators manual has been delivered to owner and he has been instructed  
on the safe and proper use of the backhoe.  
Dealer’s Signature  
CAUTION:  
It is recommended that the tractor be equipped with Rollover  
Protection System (ROPS) and seat belt be used for all  
implement operations.  
THIS CHECKLIST TO REMAIN IN OWNER’S MANUAL  
.
It is the responsibility of the dealer to complete the procedures listed  
above before delivery of this implement to the customer.  
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IMPORTANT SAFETY PRECAUTIONS  
This symbol is used to call attention to safe-  
ty 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.  
THE TRACTOR  
1. Read the tractor operator’s manual to learn how to operate your tractor safely. Failure to do so could result in seri-  
ous 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 manufacturer’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 brake, 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, determine 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 of 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 Figures 1 & 3 before attempting to operate the backhoe.  
11. NEVER dig with the backhoe unless the stabilizers are properly set.  
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SAFETY PRECAUTIONS CONTINUED  
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.  
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 brake  
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  
dipperstick or bucket.  
TRANSPORTATION  
1. ALWAYS engage safety locks before transporting backhoe. See Figures 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.  
AVOID HIGH-PRESSURE FLUIDS  
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  
from a very small hole can be almost invisible. Use a piece of cardboard or wood  
- not your hands-to search for suspected leaks.  
SEE A DOCTOR at once if injured by escaping fluid. Serious infection or gan-  
grene can develop if proper medical treatment is not administered immediately.  
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SAFETY DECALS  
The safety of the operator was a prime consideration in the design of the backhoe. Proper shielding, conve-  
nient controls, simple adjustments 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 Bush Hog for replacements.  
Location: Right Side Of  
Control Tower  
Location: Left Side Toe Shield Area  
Location: Left Side of Control Tower  
Location: Toe Shield Area  
865H BACKHOE  
665H BACKHOE  
765H BACKHOE  
965H BACKHOE  
Location: Right Side Of Control Tower  
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IMPORTANT FEDERAL LAWS AND REGULATIONS* CONCERNING  
EMPLOYERS, EMPLOYEES AND OPERATIONS.  
*(This section is intended to explain in broad 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 Law 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 a place of employment  
which are free from recognized hazards that are causing or are likely to cause  
death or serious physical harm to his employees;  
(2) shall comply with occupational safety and health standards 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 a  
ROPS.  
5. Watch where you are going, especially at row  
ends, on roads, and around trees.  
2. Where possible, avoid operating the tractor near  
ditches, embankments, and holes.  
6. Do not permit others to ride.  
7. Operate the tractor smoothly - no jerky turns,  
starts, or stops.  
3. Reduce speed when turning, crossing slopes,  
and on rough, slick, or muddy surfaces.  
8. Hitch only to the drawbar and hitch points recom-  
mended by tractor manufacturers.  
4. Stay off slopes too steep for safe operation.  
9. When tractor is stopped, set brakes securely and  
use park lock if available.  
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.)  
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GENERAL OPERATION  
Figure 1  
Dipper-Stick  
Safety Swing  
Lock Position  
CAUTION  
To avoid the possible  
injury, observe the follow-  
ing safety rules BEFORE  
OPERATING the backhoe:  
1. BE SURE area is clear of  
underground utilities or  
other hazards.  
Bucket  
Link  
Boom  
2. POSITION barricade  
around work area.  
3. PROVIDE adequate  
front end weight to  
counter-balance tractor at  
all times. 20% of the total  
tractor, loader and back-  
hoe weight must be on the  
tractor front axle.  
Boom Safety  
Lock Position  
Mainframe  
Bucket  
4. Keep bystanders a safe  
distance away.  
Stabilizer  
Cylinder  
Stabilizer  
CONTROLS  
DIRECTIONS: The terms right, left, front and back  
shall be determined from the position of the operator  
when seated in the operating position on the backhoe.  
The backhoe has two major control levers plus the  
stabilizer control levers. These controls are located on  
the control panel directly ahead of the operator. See  
Figure 2. The following is a list of the controls, with the  
function of each, reading from left to right.  
ENGINE SPEED  
The speed at which the backhoe operates is partially  
dependent on engine RPM. Use a moderate engine  
speed to start and increase it as your experience per-  
mits. Refer to “SPECIFICATIONS” for hydraulic flow  
volume requirements. When powering from tractor  
systems with higher output, reduce engine RPM to  
obtain acceptable backhoe operating speed.  
1. Boom/Swing: Push lever forward, the boom  
moves down, away from the operator. Pull lever back,  
the boom moves up, toward the operator.  
The Boom/Swing Control Lever has an added “float”  
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 posi-  
tion.  
Figure 2 Control Handles  
BOOM  
SWING  
Move lever to the left, the backhoe swings to the left.  
Move lever to the right, the backhoe swings to the  
right.  
CROWD  
BUCKET  
By moving the lever to one of the intermediate posi-  
tions, the boom can be swung left or right at the same  
it is being raised or lowered, performing the two oper-  
ations simultaneously.  
LEFT HAND  
STABILIZER  
SWING LEFT AND LOWER the boom by moving the  
control lever forward and to the left.  
RIGHT HAND  
STABILIZER  
SWING LEFT AND RAISE the boom by moving the  
control lever back and to the left.  
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Figure 3  
Safety Locks  
Swing Safety Lock  
Boom Safety Lock  
SWING RIGHT AND LOWER the boom by moving  
the lever forward and to the right.  
ations from the two levers, keeping cycle time to a  
minimum.  
SWING RIGHT AND RAISE the boom by moving the  
lever back and to the right.  
In general, the direction of movement of a control  
lever corresponds to the movement of the operating  
member.  
2. Left Hand Stabilizer: Push lever forward, the LH  
stabilizer lowers. Pull lever back, the LH stabilizer  
raises.  
Operating the Backhoe  
CAUTION  
3. Right Hand Stabilizer: Push lever forward, the RH  
stabilizer lowers. Pull lever back, the RH stabilizer  
raises.  
To avoid possible injury, observe the following  
safety rules WHEN OPERATING the backhoe.  
4. Crowd/Bucket: Push lever forward, the dipperstick  
moves out, away from the operator. Pull lever back,  
the dipperstick moves in, toward the operator.  
1. DISENGAGE safety locks as shown in Figure 3  
before attempting to operate the backhoe. Store  
lockpins in holes provided in operator platform.  
Move lever to left, the bucket curls in. Move lever to  
right, the bucket extends out.  
2. OPERATE from the backhoe operator’s seat  
only.  
By moving the lever to one of the intermediate posi-  
tions, the dipperstick can be extended or retracted at  
the same time the bucket is being loaded or dumped.  
3. LOWER the stabilizers until the rear of the trac-  
tor is totally supported by them. NOTE: rear tires  
should not come up off of the ground. See dia-  
gram on Page 11.  
EXTEND AND LOAD the bucket by moving the lever  
forward and to the left.  
4. DO NOT dig near the stabilizers.  
5. DO NOT touch overhead wires with any part of  
the backhoe.  
RETRACT AND LOAD the bucket by moving the  
lever back 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 dipperstick or bucket.  
EXTEND AND DUMP the bucket by moving the lever  
forward and to the right.  
RETRACT AND DUMP the bucket by moving the  
lever back and to the right.  
7. DO NOT lose stability by swinging the bucket  
downhill 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.  
The two operations of the boom lever, combined with  
the two operations performed by the bucket and dip-  
perstick control lever, provide four simultaneous oper-  
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Location: Back Of Control Panel  
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.  
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.  
Smooth, light handling of the controls will result in the  
most efficient backhoe operation.  
NOTE: Actuating the bucket is the key to powerful dig-  
ging. Operating the crowd and bucket controls simul-  
taneously will insure a full bucket and prevent waste  
motion and time.  
Operate the backhoe control levers to become famil-  
iar with their speed and movements. The engine  
speed and the size of the hydraulic system will deter-  
mine the speed of cylinder operation. When powering  
from tractor systems with higher output than required,  
reduce engine RPM to obtain acceptable backhoe  
operating speed.  
Transporting the Backhoe:  
IMPORTANT: To prevent serious damage to the trac-  
tor, read and follow the instructions on the following  
decal:  
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 gradu-  
ally increase the arc.  
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.  
As the operator becomes more familiar with the oper-  
ation of the backhoe, it will be common practice to  
operate two controls at one time. For example; with  
the bucket extended and the dipperstick extended,  
the lift control and crowd control can be operated  
together to bring the bucket toward the operator with  
down pressure on it. As the dipperstick 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.  
Location: Right Side of Boom  
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4. USE accessory lights and SMV emblem when trav-  
eling on highways.  
CAUTION  
To avoid possible injury, observe the following safety  
rules when transporting the backhoe:  
Before leaving backhoe operator’s seat, position the  
backhoe for transport by raising boom, crowding dip-  
perstick in, swinging to center and raising the stabiliz-  
ers.  
1. ALWAYS engage safety locks as shown on Figs. 1  
and 3 when transporting backhoe.  
2. TRAVEL SLOWLY over rough terrain, on hillsides,  
and around curves to prevent tipping.  
When transporting for long distances, periodically  
examine the backhoe and raise stabilizers and buck-  
et back up to the full transport height. It is normal for  
the backhoe to slowly settle while being transported.  
3. DO NOT drive the tractor near the edge of a ditch  
or excavation.  
WHEN TRANSPORTING  
CAUTION  
Figure 4  
DO NOT CHAIN BACKHOE DOWN IN ORDER  
TO SECURE TRACTOR TO TRAILER  
Note:  
Bucket should be  
lowered to bed  
when possible.  
DO NOT attach hold down  
chains anywhere on backhoe  
assembly.  
Block and secure  
tractor only.  
Placing the Stabilizers  
Decreased  
Digging  
Depth  
Narrower  
Stabilizer  
Platform  
Stabilizers Improperly Positioned  
Stabilizers Properly Positioned  
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 impair performance and impose unnecessary stress on the  
unit.  
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General Operations  
As the pile is approached, dump the bucket. When the  
bucket is empty, the dipperstick and bucket are in position  
to resume digging upon return to the trench.  
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 the bucket through the  
ground.  
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 bush-  
ings.  
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 tren-  
ches.  
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 crowd action  
“stalls” it may be necessary to apply lift occasionally during  
the digging cycle to correct the bucket depth.  
Position the unit so the backhoe swing post is over the cen-  
terline of the trench connection. Dig with the backhoe at  
extreme swing positions, and in as close to the stabilizers  
as possible. Pile the spoil on the opposite side of the tren-  
ches.  
To obtain a cleaner trench and avoid the buildup of materi-  
al directly in front of the backhoe, crowd out and complete-  
ly 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 crowd levers so  
the two trenches can be connected. Pile the spoil on the  
opposite side of the trench.  
DUMPING THE BUCKET  
To dump the bucket at the end of the digging cycle, lift the  
bucket clear of the trench while crowding it out and swing-  
ing it to the spoil pile.  
12  
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General Operations  
MISCELLANEOUS  
When finishing straight walls or bellholes in sandy soil, use  
a platform under the rear tires and the stabilizers. The plat-  
form 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.  
SIDE SLOPE EXCAVATING OR TRENCHING  
Dig with the backhoe uphill whenever possible.  
FINISHING STRAIGHT WALLS  
Level the backhoe on slopes 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.  
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 dipperstick boom swing cylinders or  
mainframe.  
13  
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SERVICE  
CAUTION  
placing the unit under full load.  
To avoid possible injury, observe the following  
safety rules WHEN SERVICING the backhoe:  
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.  
1. ENGAGE safety locks as shown in Figures 1 & 3  
before servicing the backhoe.  
2. DO NOT oil, grease or adjust the backhoe while it  
is in motion.  
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.  
3. DO NOT change any backhoe relief valve settings.  
They are factory set for best performance and safety.  
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  
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.  
4. ESCAPING FLUID under pressure can have suffi-  
cient force to penetrate the skin and cause serious  
injury. Be sure to relieve all pressure before discon-  
necting lines. Be sure all connections are tight and  
that lines, pipes and hoses are not damaged before  
applying pressure to the system.  
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.  
Hydraulic System Reservoir  
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.  
On PTO pump contained systems, maintain the reser-  
voir oil at the proper level by looking at the dipstick. The  
dipstick/breather cap is located directly behind the right  
hand foot pad on the backhoe. When checking oil level,  
the backhoe should be extended to full reach with the  
bucket rolled back and resting on the ground. All cylin-  
ders are retracted except for the boom cylinder. Do not  
overfill; oil may be forced out of the breather cap.  
6. SEE A DOCTOR AT ONCE if injured by escaping  
fluid. Serious infection or gangrene can develop if  
proper medical treatment is not administered immedi-  
ately.  
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.  
Fill with:  
SAE 10W40 engine oil with API “SF/SG” classifica-  
tion in northern climates.  
SAE 40W engine oil with API “SF/SG” classification  
in southern climates.  
Change oil every 200 hours or more often if neces-  
sary.  
If the tractor system supplies the hydraulic power, ser-  
vice according to the tractor instruction manual.  
BEGINNING OF SEASON  
Remove all protective covering.  
Check hydraulic hoses for deterioration and replace,  
if necessary.  
Lubricate all grease fittings and oil handle linkage.  
Bucket Tooth Points  
Check hydraulic system for loss of fluid and, if neces-  
sary, fill to proper level.  
Figure 5  
Tighten all loose bolts, nuts and setscrews.  
Inspect bucket teeth and, if necessary, sharpen or  
replace them.  
Operate the backhoe slowly for a short time before  
14  
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Tooth Replacement  
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. 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.  
①
①
①
①
①
①
①
①
Weld-On 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.  
①
①
①
*
①
①
①
①
①
Figure 8 - Lubrication Points for Model 865H  
Bolt-On tooth points, when worn, can be replaced by  
removing the hardware that connects it to the cutting  
lip. Install new tooth and replace hardware if necessary.  
**  
①①①  
①
①
①
①
Roll-Pinned tooth points, when worn, can be replaced  
by driving out the roll pin with a hammer and punch.  
Install the new tooth using a new roll pin and hammer.  
①
Tightening Nuts and Bolts  
①*  
①
①
①
Periodically, check to be sure all bolts and nuts are  
tight. See torque chart, page 28 .  
①
**  
①
①
①
Check all pivot pins for cotter pins, washers and  
retainers; if missing, replace.  
Figure 8A - Lubrication Points for Model 965H  
Lubrication  
** On Model 965H the Upper and Lower Swing Frame  
Pivot Bearings located in the Mainframe should be  
replaced every 300 to 400 operating hours.  
IMPORTANT: Avoid excessive greasing. Dirt collects  
on exposed grrease and increases wear greatly. After  
greasing, wipe off excessive grease from fittings.  
Economical and efficient operation of the backhoe is  
dependent upon regular and proper lubrication of all  
moving parts with a quality lubricant.  
①
①
①
①
①
All parts provided with grease fittings should be lubri-  
cated with a good quality chassis lube type grease. If  
any grease fittings are missing, replace them immedi-  
ately. Clean all fittings thoroughly before using grease  
gun.  
①
①
①
*
①
①
①
Lubricate all grease fittings at least twice daily, once  
at the beginning of operation and again approximate-  
ly halfway through the work day.  
①
①
①
Figure 6 - Lubrication Points for Model 665H  
Lower stabilizers to the ground, extend dipperstick  
and bucket and lower boom so bucket rests on the  
ground as shown in Figures 6, 7, 8 and 8A. Refer to  
these illustrations for the location of all grease fittings.  
①
①
①
*IMPORTANT: Before greasing boom to swing frame  
pivot (*) shown in Figures 6, 7, 8 & 8A, raise boom  
and install transport lock pin shown in Figure 1.  
①
①
①
①
On Models 665H, 765H, 865H and 965H the follow-  
ing locations should be oiled with SAE30 oil:  
①
*
①
①
①
①
A. Stabilizer Pivot Pins  
B. Control Handle Linkage  
C. Seat Bracket Pivot  
①
①
①
Figure 7 - Lubrication Points for Model 765H  
15  
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REMOVAL FROM TRACTOR - STORAGE  
Figure 9  
Backhoe Shown Partially Extended  
Backhoe Fully Extended  
Blocking For Support  
CAUTION  
The backhoe is self-assisting during the installation  
and removal procedures. For removal and storage,  
follow these steps:  
Make sure tractor PTO is disengaged and engine  
shut off before disconnecting pump or hydraulic  
lines.  
1. Install the swing safety lock pin as shown in  
Figures 1 and 3.  
a. On PTO pump self-contained systems the pump  
should be removed from the PTO shaft. The hydraulic  
system should always remain complete. No hoses or  
oil lines should be disconnected during correct  
removal and storage procedure.  
2. Stretch out the boom, dipper arm and bucket as  
shown in Figure 9. Lower the bucket to the ground so  
that it rests there solidly.  
b. On systems that tap into the tractor for hydraulic  
power, these lines can be disconnected now.  
3. Raise the backhoe operator’s seat to the raised  
position.  
IMPORTANT: Be sure to mark the lines to prevent  
mix-up, during hook-up, when the hoe is again  
attached to the tractor.  
4. Place suitable blocking under the backhoe frame to  
support it adequately as indicated in Figure 9.  
5. Detach the backhoe from the tractor mechanically  
only, not hydraulically at this point. Move the tractor a  
few inches away from the backhoe.  
Be sure to cap the ends of the lines to keep clean  
while in storage.  
8. Now slowly drive the tractor forward and away from  
the backhoe. Be careful that all parts clear each other  
during separation.  
Note: To facilitate this procedure, the backhoe can still  
be hydraulically moved, raised or lowered, to release  
the connection points of the carrying forces.  
9. Refer to the installation instructions for the attach-  
ing kit. This will help with the removal and reattaching.  
6. Gently lower the backhoe onto the blocking as indi-  
cated in Figure 9. Leave the stabilizers outstretched  
and firmly in contact with the ground for added stabil-  
ity.  
10. For long term storage, coat exposed lift, swing  
and stabilizer cylinder rods with grease.  
11. Lubricate all grease fittings and oil stabilizer pivot  
pins, and complete handle linkage.  
7. The hydraulic system can now be disconnected.  
16  
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Problems and Possible Causes, Continued  
Stabilizer Pads - 765H, 865H and 965H  
D. Loss of power in any one cylinder including lift  
and crowd - 8, 9, 10, 11, 12, 13, 23, 25, 26  
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  
options for Models 765H, 865H and 965H backhoes.  
These kits bolt to the standard pads and increase  
the versatility of the backhoe. See Figure 10.  
E. Loss of power in swing cylinders, but other cylin-  
ders functioning properly - 8, 9, 10, 11, 12, 13, 23,  
24, 26  
F. Maximum swing action cannot be obtained - 12, 15  
G. Slow operation of machine (lack of power) all  
cylinders - 1, 4, 6, 14, 16, 24  
Figure 10  
H. Spongy or jerking action of cylinders and/or noisy  
operation - 1, 3, 4, 5  
I. Lift, crowd or bucket cylinders drop under load  
when control spools shifted from neutral - 28, 30  
J. Load drops or settles - 8, 10, 13, 26, 28  
K. Leaky cylinders - 10, 11, 12, 13  
L. Leaky valve - 8, 16, 17, 29  
M. Sticky valve spool - 17, 20, 21, 22  
N. Unable to push valve spool in - 17, 18, 20, 21, 22  
O. Spring centered spools do not return to neutral -  
17, 18, 19, 20, 21, 22  
Causes and Corrections  
Hydraulic Trouble Shooting  
1. Low oil supply in reservoir - fill to proper level.  
The trouble shooting material presented in this sec-  
tion is offered as a guide to diagnosing probable caus-  
es and remedies for general operational problems.  
Match your problem with the typical problem exam-  
ples given, and note the numbers given for the possi-  
ble cause. These numbers correspond with the possi-  
ble cause and correction paragraphs that follow.  
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.  
NOTE: When using the following chart, if it is decided  
that an overhaul of components or pressure adjust-  
ments are necessary to correct malfunctioning, it is  
recommended that your dealer make these repairs.  
He is equipped to do this work.  
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.  
WARNING  
6. Insufficient pumping - advance engine throttle.  
Escaping hydraulic / diesel fluid under pressure  
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.  
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.  
8. Loose oil line connections, leaks in line or broken  
lines - tighten all hose connections and replace  
any damaged O-rings at leaking O-ring fittings.  
Check and replace any damaged hoses and lines.  
Stop engine and relieve pressure before connect-  
ing or disconnecting lines.  
Tighten all connections before starting engine or  
pressurizing lines.  
9. Restrictions in oil lines - check and replace any  
damaged hoses and lines. Check for pinched  
hoses.  
If any liquid is injected into the skin, obtain med-  
ical attention immediately or gangrene may result.  
Problems and Possible Causes  
A. Machine fails to operate when started initially - 1,  
2, 5, 7, 16, 24  
10. Oil is bypassing cylinder piston, scored piston,  
worn piston packing, or defective piston  
assembly - replace or rebuild the cylinder;  
replace damaged parts.  
B. Machine loses power after operating satisfactorily  
initially - 1, 8, 10, 14, 16, 24  
11. Scored piston rods and worn rod guides in  
cylinder - replace or rebuild the cylinder; replace  
damaged parts.  
C. Loss of power in lift or crowd cylinder, but other  
cylinders function properly - 23, 25, 30  
Continued  
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27. Check poppet 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.  
Causes and Corrections, Continued  
12. Bent piston rod in cylinder - replace or rebuild  
the cylinder; replace damaged parts.  
13.Worn or damaged rod seals on cylinder; external  
leaks - repack cylinder. Rebuild cylinder,  
replacing damaged parts as necessary.  
28. Damaged or worn spool seals - replace spool  
end seals, see item 30 at the end.  
14. Diverter valve on prime mover leaking externally  
or bypassing oil internally through valve to  
reservoir - diverter valve may need rebuilding or  
replacing.  
29. Ball in anti-cavitation check valve is stuck  
or not seating properly - clean anti-cavitation  
valve carefully, being sure that checks move  
freely and seat properly, or replace cartridge. See  
item 30 next.  
15. Something jamming the swing linkage - remove  
interference.  
30. Problems involving the control valve proper:  
16. Excessive back pressure - relieve condition. May  
be restriction from outlet to reservoir.  
This valve is a precision device and is not intend-  
ed 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 reser-  
voir oil supply is kept clean and only factory sup-  
plied packings are used in cylinder repair. Every-  
thing must be clean and free of dirt during the  
oil line removal and replacement, and during any  
cylinder work.  
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.  
Pages 19 and 20, Valve Repair-Disassembly,  
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.  
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 for the 665H, 2100 psi for  
the 765H, 2400 psi for the 865H and 2250 psi for  
the 965H. 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.  
18  
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VALVE REPAIR - DISASSEMBLY  
Figure 11  
SCREW 5/16-18 x 3/4  
RETURN SPRING  
RETAINER  
SPOOL  
COLLAR  
RETURN  
SPRING  
BACK-UP  
WASHER  
SPRING COLLAR  
SCREW, 5/16-18  
x 3/4  
SPOOL COLLAR  
LOCKWASHER  
LOCKWASHER  
O-RING SEAL  
SPRING  
COLLAR  
SCREW, 1/4-20  
x 7/8  
STANDARD SPRING CENTERED BONNET ASSEMBLY  
RETURN SPRING  
DETENT BALL FOLLOWER  
BONNET  
U-CUP SEAL  
FLOAT SLEEVE  
RETAINING SLEEVE  
RETAINING RING  
STOP COLLAR  
DETENT SPRING  
DETENT BALL  
O-RING SEAL  
LOCKWASHER  
SCREW, 1/4-20 x 7/8  
FLOAT BONNET ASSEMBLY  
7. Thoroughly clean the O-ring counterbores and the  
ground surfaces of each section. Place O-ring seals,  
ordered as a kit, in proper counterbores. For better  
sealing it is recommended that all O-rings, used in the  
counterbores, are replaced with new parts.  
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.  
8. Replace the sections on tie rods with the O-ring  
counterbores facing the right end of the valve. Be  
careful replacing the sections so that the section O-  
rings are not moved from the counterbores.  
2. Thoroughly clean the exterior of the valve before  
beginning disassembly procedures.  
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.  
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 spools may bind and stick.  
4. Mount the valve vertically in a vise to facilitate dis-  
assembly and assembly.  
Replacing Spool Seals:  
5. Remove the 3 tie rod nuts from the right end sec-  
tion, using a thin-wall socket.  
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.  
6. Valve sections can now be removed by sliding the  
sections along the tie rods.  
19  
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1. Remove control valve from the backhoe.  
valve spool and insert in seal counterbore. Replace  
back-up washer and seal retainer.  
2. Thoroughly clean the exterior of the valve before  
beginning disassembly procedures.  
B. Float Bonnet Assembly Only:  
3. At the BACK of the valve remove all bonnet assem-  
bly 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.  
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 counterbore.  
7. At the BACK of the valve replace bonnet assembly  
parts, reversing the order in which they were disas-  
sembled in step 3. Use 12 ft. lbs. torque to tighten  
assembly screw on spring centered 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 dri-  
ver 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 fin-  
ish.  
8. At the FRONT of the valve remove all parts con-  
nected to the spool (handle, linkage, etc.).  
9. At the FRONT of the valve remove seal plate retain-  
er, seal retainer, back-up washer and spool O-ring  
seal.  
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.  
10. Thoroughly clean counterbore.  
5. Thoroughly clean counterbores.  
6. Install new seals:  
11. Lightly oil new O-ring seal. Slide O-ring seal over  
valve spool and insert in seal counterbore. Replace  
back-up washer, seal retainer, and seal plate retainer.  
A. Spring-Centered Bonnet Assembly Only:  
Lightly oil new O-ring seal. Slide O-ring seal over  
12. Reattach all parts connected to the spool (handle,  
linkage, etc.).  
ASSEMBLY  
Basic components for all models can be identified in Figure 12. Refer to Page 38 for photographs of units on their shipping pallets.  
Assembly(865H & 965H) - Figure 12  
IMPORTANT: Tighten all hardware to torque require-  
ments specified in torque chart.  
General:  
The backhoe has been partially disassembled and  
strapped to a skid for shipping purposes. Initial installa-  
tion 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.  
1. Remove the stabilizer assemblies and any miscellaneous  
items which have been fastened to the skid and arrange  
conveniently. Reposition Stabilizer Cylinders from their ship-  
ping configuration, by assembling them into the mainframe,  
using the hardware provided. Be sure cylinder ports are  
pointed upward and hoses are routed above the cylinder to  
mainframe pivot pin connection. Refer to page 38.  
Figure 12  
C
CAUTION  
DO NOT cut any strapping that  
fastens the backhoe mainframe  
and swing frame to the skid base  
at this time.  
B
A
2. Support boom(A) and dipperstick (B) with hoist and  
remove boom transport lock pin. Lower boom and  
manually extend dipperstick until it rests on ground.  
Move control handle to “BOOM DOWN” position as  
required to aid movement.  
E
I
CAUTION  
D
G
Be sure hoist being used is suit-  
able, has sufficient capacity and  
is in the proper position. Do not  
allow anyone under a backhoe  
member supported by hoist.  
H
F
20  
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3. Remove plastic bag containing bucket pins from  
backhoe. Attach bucket (D) to dipperstick using one  
pin, two bolts, nuts, lockwashers, pin retainers and  
washers as necessary.  
6. Attach stabilizer cylinders (H) to stabilizers using  
pins and hardware assembled to stabilizers.  
7. Using caution to prevent tipping, raise mainframe  
with hoist to a height of approximately 11” for 862H  
and 13” for 962H and remove skid. Block mainframe  
(G) and swing frame (I) securely.  
4. Attach bucket link (E) to bucket, using same hard-  
ware as listed for step #3.  
5. Attach hoist to backhoe to prevent tipping. Remove  
all remaining strapping and attach stabilizers (F) to  
mainframe (G) using pins and hardware assembled to  
backhoe.  
8. Follow the Attaching Kit Assembly Instructions to  
mount the backhoe to the tractor. Check the installa-  
tion carefully and make sure that all members are cor-  
rectly installed and securely fastened.  
CAUTION  
Assembly:(665H & 765H) - Figure 12  
Be sure hoist being used is suitable, has suffi-  
cient capacity and is in the proper position. Do  
not allow anyone under a backhoe member sup-  
ported by hoist.  
(See “General” note, page 20)  
IMPORTANT: Tighten all hardware to torque  
requirements specified in torque chart.  
3. Remove plastic bag containing bucket pins from  
backhoe. Attach Bucket (D) to Dipperstick using one  
pin, two bolts, locknuts, pin retainers, and washers as  
needed to take up gap under pin retainers.  
CAUTION  
DO NOT cut any strapping that fastens the back-  
hoe mainframe and swing frame to the skid at  
this time.  
4. Attach Bucket Link (E) to Bucket, using same  
hardware as listed for step #3.  
1. Remove the stabilizer assemblies and any miscella-  
neous items which have been fastened to skid and  
arrange conveniently. Reposition stabilizer cylinders from  
their shipping configuration, by assembling them into the  
mainframe, using the hardware provided. Be sure cylinder  
ports are pointed upward and hoses are routed above the  
cylinder to mainframe pivot pin connection. Refer to page 36.  
5. Reposition hoist on backhoe to prevent tipping and  
raise Mainframe slightly. Remove all remaining strap-  
ping and crate base. 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 pins  
and hardware assembled to Stabilizers (F).  
7. Attach Stabilizer Cylinders (H) to stabilizers (F)  
using pins and hardware assembled to Stabilizers (F).  
2. Support Boom (A) and Dipperstick (B) with hoist  
and remove Boom transport lock pin. Lower Boom  
and manually extend Dipperstick until it rests on the  
ground. Move control handle to “Boom Down” position  
as required to aid movement.  
8. Follow the Attaching Kit Assembly Instructions to  
mount the backhoe to the tractor. Check the installa-  
tion carefully and make sure that all members are cor-  
rectly installed and securely fastened.  
ATTACHING KIT INSTRUCTIONS (For 665H & 765H)  
3-POINT HITCH LINKAGE & HYDRAULIC HOOK-UP  
TO TRACTOR HYDRAULIC SYSTEMS  
General Description  
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.  
Mounting and hydraulics kits include two hoses which  
can be used to connect the backhoe to the tractor  
hydraulic system. Additional hydraulic components or  
kits will be required to complete the hook-up to the  
tractor hydraulic system. Refer to the Hydraulic Hook-  
up section for further information. Pumps and reser-  
voir kits are available as options.  
IMPORTANT: If the 3-Point Kit is to be used with a  
PTO & Reservoir Kit, the Reservoir Tank and it’s fit-  
tings should be installed before proceeding with the  
3-Point installation.  
The backhoe is mounted on the tractor lower link  
arms and an adjustable upper link is supplied to  
replace the tractor 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.  
21  
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using 3/4 x 4-1/2” bolt (9), flat washers (10), lock-  
washer (9) and nut (11). Use hoist to raise or lower  
backhoe slightly until a hole in the upper bar aligns  
with a hole in the upper braces. See Figure 13.  
(Refer to Figures 13 & 14)  
ASSEMBLY  
IMPORTANT: Tighten all hardware to the torque  
requirements specified in the torque chart.  
WARNING  
6. Attach RH lower link weldment (1) and LH lower  
link weldment (2) to backhoe mainframe using 3/4 x  
2-1/4” bolt (15), flat wahser (10), lockwasher (9), and  
nut (11). See Figure 14.  
To prevent bodily injury, do not operate backhoe  
unless Lower Link Weldments (1, 2) are properly  
installed and adjusted. Failure to do so may  
result in backhoe being thrust upward, crushing  
operator against cab or ROPS.  
7. Align RH and LH link weldment (1, 2) with a hole in  
the upper bar/brace assembly, as close to the tractor  
as possible. Use 3/4 x 6” bolt(16), flat washer (10),  
lockwasher (9), and nut (11). See Figure 14. You may  
need to return to Step 6 and readjust upward or down-  
ward the bolt connection.  
1. Use hoist to raise the backhoe mainframe so that  
the boom pivot pin is aproximately 12” (662H), or 14”  
(762H), 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 (3), two cotter pins (4), and  
two wire form cotter pins (5) as shown in Figure 14.  
8. Remove backhoe from the tractor.  
9. Install connector plate (17) to RH and LH lower link  
weldments (1, 2) using 1/2 x 1-3/4” bolt (18), lockwash-  
er (19), and nut (20). See Figure 14.  
NOTE: If tractor has a Category II hitch, install two  
bushings (6) in lower link arms as shown in Figure 14.  
10. Tighten all hardware at this time. Check your instal-  
lation very carefully to be sure all members are correct-  
ly installed and securely fastened.  
3. Attach upper braces (7), Figure 14 to backhoe with  
3/4 x 7-1/2” bolt (8), lockwasher (9), flat washers (10)  
and nut (11). Do not tighten hardware at this time.  
10A. If using optional PTO Pump and Reservoir Kit  
proceed to that section prior to remounting the back-  
hoe onto the tractor.  
4. Install bushing (12) or bushing (13) in the hole of  
the upper bar (14) that most closely matches the  
diameter of the tractor upper link pin, as shown in  
Figure 14. No bushing is necessary for Category II  
tractors.  
11. 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.  
5. Secure upper bar (14) between upper braces (7)  
Figure 13  
Tractor Upper  
Link Weldment  
Upper Brace  
Upper Bar  
Backhoe Mainframe  
Boom Pivot Pin  
C
Tractor Lower Link  
Link Weldment  
22  
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Figure 14  
(665H & 765H)  
11  
9
10  
14  
7
12  
13  
8
10  
20  
10  
19  
16  
7
9 11 1  
10  
9
11  
9
18 17  
2
10  
6
10  
15  
3
5
4
ATTACHING KIT INSTRUCTIONS (For 865H)  
3-POINT HITCH LINKAGE & HYDRAULIC HOOK-UP  
TO TRACTOR HYDRAULIC SYSTEMS  
link to the backhoe mainframe, locking the hoe rigid-  
ly in one position.  
General Description  
Mounting and hydraulic kits include two hoses which  
can be used in connecting the backhoe control valve  
to the tractor hydraulic system. Additional hydraulic  
components or kits will be required to complete the  
hook-up to the tractor hydraulic system. Refer to  
“Hydraulic Hook-Up” section for further information.  
Pump and reservoir kits are available as options.  
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 fit-  
tings should be installed before proceeding with the  
3-Point installation.  
The backhoe is mounted on the tractor lower link  
arms and an adjustable upper link is supplied to  
replace the tractor upper link. A set of stabilizer arms  
are included. They bolt from the adjustable upper  
23  
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Figure 15  
14  
12 11  
9
7
10 13  
26  
24  
16 17  
25  
1
8
28  
27  
22  
29  
15  
23  
35  
36  
25  
25  
25  
32  
33 22  
3
26  
37  
24  
24  
30  
6
35  
2
34  
38  
25  
26 25  
31  
21  
5
4
18  
20 19  
5. Back tractor close to the backhoe. Connect tractor  
lower link arms to lower link mounts at position “C”,  
Figure 16, using two L-pins (18), two cotter pins (19),  
and two wire form cotter pins (20) as shown in  
Figure 15.  
ASSEMBLY  
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 ( Figure 15 - 1, 2)  
are properly installed and adjusted. Failure to do  
so may result in backhoe being thrust upward,  
crushing operator against cab or ROPS.  
NOTE: If tractor has a Category II hitch, install two  
bushings (21) in lower link arms as shown in Figure 15.  
6. Attach upper braces (22), Figure 15 to backhoe with  
3/4 x 7-1/2” bolt (23), lockwasher (24), flat washers (25)  
and nut (26). Do not tighten hardware at this time.  
1. Use hoist to raise the backhoe mainframe so that  
the boom pivot pin is approximately 16” off the  
ground.  
7. Install bushing (27) or bushing (28) in the hole of the  
upper bar (29) that most closely matches the diameter  
of the tractor upper link pin, as shown in Figure 15. No  
bushing is necessary for Category II tractors.  
2. Attach adapter weldment (3) to backhoe main-  
frame using twelve 1/2 x 7-1/2” bolts (4), washers  
(5), and locknuts (6), as shown in Figure 15.  
8. Secure upper bar (29) between upper braces (22)  
using 3/4 x 4-1/2” bolt (30), flat washers (25), lockwash-  
er (24) and nut (26). Use hoist to raise or lower back-  
hoe slightly until a hole in the upper bar aligns with a  
hole in the upper braces. See Figure 15.  
3. Install RH foot pad (7) and LH foot pad (8) to  
adapter weldment (3) as shown in Figure 15. Use four  
carriage 5/16 x 1” bolts (9), washers (10), lockwashers  
(11), and nuts (12). Also use two 5/16 x 1-1/4” bolts  
(13), washers (10), lockwashers (11), and nuts (12).  
9. Attach RH lower link weldment (1) and LH lower link  
weldment (2) to backhoe mainframe using 3/4 x 2-1/4” bolt  
(31), flat washer (25), lockwasher (24), and nut (26). See  
Figure 15.  
4. Attach seat assembly (14) to adapter weldment  
(3) as shown in Figure 15. Use four carriage 1/2 x 1-  
3/4” bolts (15), lockwashers (16), and nuts (17).  
24  
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Figure 16  
Upper Bar  
Tractor Upper  
Link Bracket  
Upper Brace  
Link Weldment  
Backhoe Mainframe  
Tractor Lower Link  
C
correctly installed and securely fastened.  
10. Align RH and LH link weldment (12) with a hole  
in the upper bar/brace assembly, as close to the  
tractor as possible. Use 3/4 x 6” bolt (32), flat washer  
(25), lockwasher (24), and nut (26). See Figure 15.  
You may need to return to Step 6 and readjust  
upward or downward the bolt connection.  
14. If using optional PTO Pump and Reservoir Kit  
proceed to that section prior to remounting the back-  
hoe onto the tractor.  
15. 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.  
11. Remove backhoe from the tractor.  
12. Install connector plate (33) to RH and LH lower  
link weldments (1, 2) using 1/2 x 1-3/4” bolt (34),  
lockwasher (35), and nut (36). See Figure 15.  
16. Attach bumper plate (37) to backhoe mainframe  
using two bolts (38), lockwashers, and flat washers  
(35, 5) once the “Hydraulic Hook-Up” has been com-  
pleted. See Figure 15.  
13. Tighten all hardware at this time. Check your  
installation very carefully to be sure all members are  
The decal shown below is located on the Left Hand  
toe shield.  
Hydraulic Hook-Up  
If the optional Pump and Reservoir Kit is to be used,  
refer to the instructions for that kit for proper assembly.  
There are four basic methods of hooking up the back-  
hoe to the hydraulic system of a tractor. The correct  
method for the particular tractor will depend on the  
remote couplers available, whether a loader valve or  
other accessory valve is connected to the tractor sys-  
tem, and whether the tractor has an open-center sys-  
tem (constant pumping of oil to control valve and back  
to reservoir) or a closed-center system (no flow of oil  
until there is a demand at one hydraulic cylinder). The  
four hook up methods are described below.  
IMPORTANT: Follow instructions carefully when con-  
necting backhoe to tractor hydraulic system.  
25  
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Note: The surge relief valve is not supplied with the  
backhoe or mounting kit and must be ordered sepa-  
rately to complete this type hydraulic hook-up.  
Note: Do not connect hoses from the backhoe con-  
trol valve to the tractor hydraulic system until initial  
assembly of mounting kit is complete.  
Complete the hydraulic hook-up by connecting the  
surge relief valve to the return port of tractor remote  
couplers or directly to the tractor valve, and by con-  
necting a hose from the TANK port of the surge  
relief valve to the tractor reservoir as shown in  
Figure 18. The surge relief valve is used to protect  
the backhoe valve from damage caused by acciden-  
tal pressurization or high back pressure build-up. If  
this happens, oil will be vented from the TANK port  
of the surge relief valve to the tractor reservoir to  
prevent loss of vented oil.  
1. OPEN-CENTER SYSTEM WITH LOADER  
VALVE OR OTHER ACCESSORY VALVE CON-  
NECTED TO THE TRACTOR HYDRAULIC SYS-  
TEM:  
When a loader valve or other accessory valve must  
be connected to the tractor hydraulic system in addi-  
tion to the backhoe control valve, a Power Beyond  
Kit is required. This kit converts the backhoe valve  
so that pressurized hydraulic oil can be directed to  
another open-center valve for a loader or other  
accessory. This allows the backhoe valve and the  
other valve to be connected to the tractor hydraulic  
system simultaneously, without the inconvenience of  
using a flow diverting valve.  
Figure 17  
Since the Power Beyond Kit is used with open-cen-  
ter tractor hydraulic systems, oil constantly flows  
from the pump, through the backhoe valve and the  
loader valve or other accessory valve, and then to  
the reservoir. See further in this manual for instruc-  
tions on proper assembly.  
Backhoe Valve  
Coupler tip (not sup-  
plied) to connect to  
pressure port of oil  
supply  
A
2. CLOSED CENTER SYSTEM: (665H &765H))  
Because a closed-center system requires no flow  
of oil through the backhoe control valve when the  
levers are in a neutral position, the 665H & 765H  
backhoes must not be connected to a closed-  
center tractor hydraulic system. A PTO pump kit  
is required if the tractor is to be mounted to a  
tractor with closed-center hydraulic system.  
Tractor  
Reservoir  
B
IMPORTANT: Do not connect a 665H or 765H  
backhoe control valve to a closed-center tractor  
hydraulic system, or serious damage to backhoe  
valve or tractor hydraulic system may result.  
Figure 18  
3. OPEN-CENTER SYSTEM WITH RETURN OIL  
NOT REQUIRED FOR LUBRICATION - Figure 17  
Backhoe Valve  
The pressure hose (A) on the backhoe control valve  
should be connected to the pressure port of the trac-  
tor’s remote couplers or directly to the tractor valve.  
The return hose (B) on the backhoe control valve  
should be connected directly to a port on the reser-  
voir, as shown in Figure 17.  
Coupler tip (not sup-  
plied) to connect to  
pressure port of oil  
supply  
A
IMPORTANT: Never connect the return hose to a  
tractor remote coupler which can be pressurized.  
Accidental pressurization can cause serious  
damage to backhoe valve.  
Coupler tip (not sup-  
plied) to connect to  
return port of oil  
supply  
4. OPEN-CENTER SYSTEM WITH RETURN OIL  
REQUIRED FOR LUBRICATION - Figure 18  
On some tractors, the return oil cannot be routed  
directly to the reservoir because it is required for the  
lubrication of other functions. Check this characteris-  
tic with your dealer. The pressure hose (A) on the  
backhoe control valve must be connected to the  
pressure port of the tractor’s remote couplers or  
directly to the tractor valve. The return hose (B) on  
the backhoe control valve must be connected to a  
surge relief valve as shown in Figure 18.  
Surge relief valve  
B
Tractor reservoir  
Hose supplied  
by customer  
26  
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is completely destroked and there is no delivery.  
Hydraulic Hook-Up (865H & 965H)  
For Tractors With Closed-Center Hydraulic Systems  
Therefore, when working various backhoe functions at  
near maximum ability, it will give the operator the  
impression that the backhoe is sluggish and somewhat  
unresponsive. Learning to ease up slightly at the first  
indication of slow down will permit the backhoe to per-  
form at continuing maximum speed and efficiency.  
There are two basic types of hydraulic systems, open-  
center and closed-center. The open-center system con-  
stantly pumps oil through the hydraulic cylinder operat-  
ing valves and returns the oil to the reservoir. The  
closed-center system does not pump oil until there is a  
demand for oil from one of the hydraulic cylinders.  
Hook-Up Diagram  
Replace 2400 PSI relief valve (865H) or  
2250 PSI (965H) with 2600 PSI relief  
valve.  
In this case, CLOSED-CENTER means that when the  
operating valves which control the hydraulic cylinders  
are in the neutral position, there is no flow of oil through  
the valves. As long as the engine and pump are run-  
ning, a constant stand-by oil pressure of approximately  
2000 PSI or more is maintained in the system. Pressure  
oil is available instantaneously to go to work when any  
one of the operating valves is opened.  
Figure 19  
BACKHOE VALVE  
4
6
1
7
Because there must be no flow through the backhoe  
control valve, when the levers are in neutral position, the  
backhoe must be converted for closed-center operation.  
Replace open-center  
plug with closed-center  
plug, shown.  
2
Tractor  
1
Hook-Up Requirements  
Coupler  
Tip  
The hook-up of the 865H & 965H Backhoes to the  
closed-center system requires more than connecting it  
to the remote couplers. The required devices are:  
5
3
1. A flow restrictor in the pressure line to keep the speed  
of the backhoe operation within safe and acceptable limits.  
2. A main relief valve in the backhoe control valve with a  
pressure setting that is always higher than the tractor  
system pressure.  
For John Deere Tractors use reservoir plug. Remove  
plug, drill with 37/64 drill, and tap 3/8 NPT pipe. Screw  
plug onto hose, locking with Locktite to assure  
assembly will remain together during connecting  
and disconnecting procedures. Obtain another plug  
from your dealer to use when backhoe is removed.  
3. A closed-center plug in the backhoe control valve to  
make it a non-circulating or a demand type system.  
4. A low pressure surge relief valve in the return line  
to keep the tractor back pressure surges from dam-  
aging the backhoe control valve seals or tractor sys-  
tem. A surplus flow line from the relief valve carries only  
the excess surge oil directly back to the tractor hydraulic  
reservoir so that it bypasses all other tractor functions.  
For other tractor makes, use filler plug, drain plug,  
or any other port that goes directly into the hydraulic  
reservoir. Do not rely only on the remote coupler  
return.  
Figure 20  
JOHN DEERE - DIAL APPROXIMATELY  
AS SHOWN  
Backhoe Operation  
For the most part, a backhoe will function about the  
same whether it is powered by an open-center or  
closed-center hydraulic system. However, there are  
some differences which the operator should be aware of.  
As a backhoe function (lifting, actuating the bucket to fill  
it, etc.) becomes increasingly difficult and the hydraulic  
system pressure is rising closer to its maximum setting,  
there will be a noticeable slow down before stoppage  
occurs. As the system pressure is approaching maxi-  
mum, the pump is also beginning to stroke back for less  
and less fluid delivery. At maximum pressure, the pump  
Typical plug for surplus relief flow line. Check care-  
fully that it enters the reservoir before using. Note  
that the location varies with different tractor makes  
and models. A John Deere Tractor is shown.  
27  
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Figure 21  
(965H)  
207  
213  
207  
217  
210  
220  
221  
216  
203  
210  
210  
208  
206  
205  
200  
204  
210  
219  
210  
209  
207  
203  
207  
218  
210  
210  
202  
215  
214  
212  
211  
ATTACHING KIT INSTRUCTIONS (For 965H)  
3-POINT HITCH LINKAGE & HYDRAULIC HOOK-UP  
TO TRACTOR HYDRAULIC SYSTEMS  
link to the backhoe mainframe, locking the hoe rigid-  
ly in one position.  
General Description  
Mounting and hydraulic kits include two hoses which  
can be used in connecting the backhoe control valve  
to the tractor hydraulic system. Additional hydraulic  
components or kits will be required to complete the  
hook-up to the tractor hydraulic system. Refer to  
“Hydraulic Hook-Up” section for further information.  
Pump and reservoir kits are available as options.  
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 fit-  
tings should be installed before proceeding with the  
3-Point installation.  
The backhoe is mounted on the tractor lower link  
arms and an adjustable upper link is supplied to  
replace the tractor upper link. A set of stabilizer arms  
are included. They bolt from the adjustable upper  
28  
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5. Secure upper bar (220) between upper braces  
(221) using 3/4 x 5” bolts (203), flat washers (210),  
and nuts (207). Use hoist to raise or lower backhoe  
slightly until a hole in the upperr bar aligns with a  
hole in the upper braces. See Figure 21.  
ASSEMBLY (Refer to Figure 21 & 22)  
IMPORTANT: Tighten all hardware to the torque  
requirements specified in the torque chart.  
WARNING  
6. Attach RH lower link weldment (217) and LH  
lower link weldment (218) to backhoe mainframe  
using 3/4 x 2-1/2” bolt (202), flat washer (210), and  
nut (207). See Figure 21.  
TO PREVENT BODILY INJURY, DO NOT  
OPERATE BACKHOE UNLESS LOWER  
LINK WELDMENTS (217,218) ARE PROPER-  
LY INSTEALLED AND ADJUSTED. FAILURE  
TO DO SO MAY RESULT IN BACKHOE  
BEING THRUST UPWARD, CRUSHING  
OPERATOR AGAINST CAB OR ROPS.  
7. Align RH and LH link weldment (217, 218) with a  
hole in the upper bar/brace assembly, as close to  
the tractor as possible. Use 3/4 x 6-1/2” bolt (204),  
flat washer (210), and nut (207). See Figure 21. You  
may need to return to Step 6 and readjust upward or  
downward the bolt connection.  
1. Use hoist to raise the backhoe mainframe so that  
the boom pivot pin is approximately 16” off the  
ground.  
8. Remove backhoe from the tractor.  
9. Install connector plate (219) to RH and LH lower  
link weldments (217, 218) using 5/8 x 2” bolt (200),  
lockwasher (208), and nut (206). See Figure 21.  
2. Back tractor close to the backhoe. Connect tractor  
lower link arms to lower link mounts at position “C”,  
Figure 22, using two L-pins (214), two cotter pins (211),  
and two wire form cotter pins (212) as shown in Figure 21.  
10. Tighten all hardware at this time. Check your  
installation very carefully to be sure all members are  
correctly installed and securely fastened.  
NOTE: If tractor has a category II hitch, install two bush-  
ings (215) in lower link arms as shoen in Figure 21.  
10A. If using optional PTO Pump and Reservoir Kit  
proceed to that section prior to remounting the back-  
hoe onto the tractor.  
3. Attach upper braces (221), Figure 21 to backhoe with  
3/4 x 7-1/2” bolt (205), lockwasher (209), flat washers  
(210) and nut (207). Do not tighten hardware at this time.  
11. Connect hoses from the backhoe control valve  
to the tractor hydraulic system as described in  
“Hydraulic Hook-Up” section, pages 25-27, prior to  
remounting the backhoe onto the tractor.  
4. Install bushing (213) or bushing (216) in the hole of the  
upper bar (220) that most closely matches the diameter  
of the tractor upper link pin, as shown in Figure 21. No  
bushing is necessary for Category II tractors.  
Figure 22  
Tractor Upper  
Link Weldment  
Upper Brace  
Upper Bar  
Backhoe Mainframe  
Boom Pivot Pin  
Tractor Lower Link  
C
Link Weldment  
29  
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TORQUE VALUES  
Common bolts and nuts  
Tightening Torque Plus/Minus 20%  
Size  
Grade 2  
Grade 5  
Grade 8  
1/4-20 NC  
1/4-28 NF  
70 in. lbs.  
85 in. lbs.  
115 in. lbs.  
140 in. lbs.  
165 in. lbs.  
200 in. lbs.  
5/16-18 NC  
5/16-24 NF  
150 in. lbs.  
165 in. lbs.  
250 in. lbs.  
270 in. lbs.  
350 in. lbs.  
30 ft. lbs.  
3/8-16 NC  
3/8-24 NF  
260 in. lbs.  
300 in. lbs.  
35 ft. lbs.  
40 ft. lbs.  
50 ft. lbs.  
60 ft. lbs.  
7/16-14 NC  
7/16-20 NF  
35 ft. lbs.  
45 ft. lbs.  
55 ft. lbs.  
75 ft. lbs.  
80 ft. lbs.  
105 ft. lbs.  
1/2-13 NC  
1/2-20 NF  
50 ft. lbs.  
70 ft. lbs.  
80 ft. lbs.  
105 ft. lbs.  
115 ft. lbs.  
165 ft. lbs.  
9/16-12 NC  
9/16-18 NF  
75 ft. lbs.  
100 ft. lbs.  
125 ft. lbs.  
165 ft. lbs.  
175 ft. lbs.  
230 ft. lbs.  
5/8-11 NC  
5/8-18 NF  
110 ft. lbs.  
140 ft. lbs.  
180 ft. lbs.  
230 ft. lbs.  
260 ft. lbs.  
330 ft. lbs.  
3/4-10 NC  
3/4-16 NF  
150 ft. lbs.  
200 ft. lbs.  
245 ft. lbs.  
325 ft. lbs.  
350 ft. lbs.  
470 ft. lbs.  
Note - See tractor instruction manual or your tractor dealer for tightening of metric bolts.  
POWER BEYOND KITS  
FOR TRACTORS WITH OPEN-CENTER HYDRAULIC SYSTEMS  
General Description  
the backhoe valve be ordered from Bush Hog as a  
separate item.  
A power beyond application is required to convert a  
hydraulic valve so that pressurized oil can be directed  
to another “open center” valve. This allows the back-  
hoe valve and a loader valve, or other accessory, to  
be connected to the tractor hydraulic system simulta-  
neously, without the inconvenience of using a flow  
diverting valve.  
The hoses and fittings required in either procedure to  
connect the two valves together are not supplied. The  
proper fittings and hose lengths required must be  
determined for each specific application. The parts  
must be supplied by the customer.  
Tractor Preparation  
Since the power beyond application is only required  
on “open center” hydraulic systems, oil will be con-  
stantly flowing from the pump through the backhoe  
and loader or other accessory valve, and then back to  
the reservoir. “Open center” refers to this constant  
flow through the open center of the valves.  
Stop tractor, lower all attachments to the ground, and  
relieve pressure in all hydraulic lines by moving all  
control handles back and forth or side to side several  
times.  
Backhoe Preparation  
The assembly instructions cover two conditions that  
require a power beyond kit to be ordered from Bush  
Hog. The first procedure shows the recommended  
method of connecting a Bush Hog loader with a Bush  
Hog valve to a Bush Hog backhoe. The second pro-  
cedure shows the recommended method for connect-  
ing a Bush Hog backhoe and a competitive loader or  
a non Bush Hog valve. The second is also used to  
operate the backhoe and loader off the backhoe PTO  
pump kit option. The power beyond plug is included  
with the loader valve when the valve is ordered. The  
second procedure requires the power beyond kit for  
1. Remove shroud covering valve hydraulic fittings.  
Note: The terms RIGHT and LEFT for all adapter  
parts are determined from the position of the operator  
when seated in the operating position on the backhoe.  
2. Carefully clean the top and right side of the back-  
hoe control valve and remove the “conversion” plug  
located in the center of the right side of the valve.  
Note: If there are two plugs in this area, the conver-  
sion plug is the larger plug located lower on the right  
side of the valve.  
30  
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obtained from Bush Hog Service Parts. Before  
attempting to order the plug you must first determine  
the manufacturer of the loader valve assembled to  
your loader. This can be determined from the identifi-  
cation plate located on the valve.  
ASSEMBLY OF A BUSH HOG BACKHOE  
TO A BUSH HOG LOADER VALVE  
IMPORTANT: Improper hydraulic hook-up can  
cause serious damage to backhoe control valve or  
other hydraulic components. Refer to the Bush Hog  
loader Operator’s Manual during this procedure.  
1. Install the power beyond plug received with the  
loader valve into valve cavity as shown in Figure 23  
(Page 32). Make sure O-rings on sleeve are posi-  
tioned properly and are not pinched or damaged.  
When connecting the Bush Hog backhoe valve to a  
Bush Hog front end loader valve, the input pressure  
line from the tractor will be connected to the loader  
valve first. The power beyond pressure line will be  
connected to the input pressure port of the backhoe  
valve. In order to properly plumb the system, the  
loader valve will require converting to a power  
beyond valve. Refer to the Operator’s Manual  
received with the loader for the proper assembly of  
the power beyond valve.  
2. Install a pressure line (supplied by customer)  
between the tractor pressure “out” port and the pres-  
sure inlet port of the loader valve.  
3. Install a pressure line (supplied by customer)  
between the power beyond fitting of the loader valve  
and the pressure inlet port of the backhoe valve as  
shown in Figure 23.  
There have been several different valves used on  
the loader in past years. The fittings required to con-  
vert the Bush Hog loader valve to a power beyond  
application are included in the loader valve kit. If the  
fittings (or plugs) cannot be located, they can be  
4. Complete assembly of “return” hoses as shown in  
Figure 23. Connect return hoses from both valves to  
tee as shown. Hoses and tee supplied by customer.  
Connect the return line directly to a port on the tractor  
reservoir as shown in Figure 23.  
31  
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BUSH HOG BACKHOE & BUSH HOG LOADER VALVE  
FIGURE 23  
NOTE: Large loader valve  
shown. Small loader valve  
porting is different. Refer to  
loader operator’s manual for  
different valves.  
Outlet  
Inlet  
Bush Hog Loader Valve  
Open Center  
Plug  
Power Beyond  
Plug  
(Supplied With Valve)  
Tractor  
Pressure Outlet  
Backhoe  
Outlet  
Plug  
Pipe Tee  
Inlet  
Tractor Reservoir Port  
IMPORTANT: Never connect the return hose to a tractor remote  
coupler which can be pressurised. Accidental pressurization  
can cause serious damage to backhoe valve.  
32  
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865H & 965H - Assemble straight O-ring adapter  
union (3) to power beyond sleeve (1). Install 90  
degree pipe threaded adapter union (2) into adapter  
union (3).  
ASSEMBLY:  
BUSH HOG BACKHOE AND A NON BUSH HOG  
LOADER - OR - BUSH HOG BACKHOE AND  
LOADER USING PTO PUMP KIT OPTION  
3. Assemble hydraulic hose (supplied by customer)  
to adapter union (2) as shown in Figure 24. Hose  
should have same pressure rating as original pres-  
sure hose to loader or other accessory valve.  
IMPORTANT: Improper hydraulic hook-up can cause  
serious damage to backhoe control valve or other  
hydraulic components.  
The following instructions are to be used to connect the  
backhoe valve in line with a front end loader valve that  
is not a Bush Hog loader valve. When connecting the  
Bush Hog backhoe valve to a loader valve other than  
one obtained from Bush Hog, the input pressure line  
from the tractor will be connected to the backhoe valve  
first. In order to properly plumb the system, the back-  
hoe valve will require converting to a power beyond  
valve. The power beyond pressue line from the back-  
hoe valve will be connected to the input pressure port  
of the loader valve. The power beyond kit for the back-  
hoe being assembled must be ordered as a separate  
item from Bush Hog.  
4. Install hose sleeve (4) onto hose assembled in  
step 3. Position hose sleeve to completely cover  
adapter union (2) and secure with plastic tie (8) as  
shown in Figure 24.  
CAUTION  
Hose sleeve (4) is installed to help protect the  
backhoe operator from escaping fluid under  
pressure. If it becomes damaged or lost, replace  
hose sleeve (4) and plastic ties (8) immediately.  
5. Assemble hydraulic hose (see step 3) from back-  
hoe power beyond port to loader or accessory valve  
inlet port using fittings (supplied by customer) as  
needed. Refer to Figure 24.  
Assembly  
IMPORTANT: Improper hydraulic hook-up can  
cause serious damage to backhoe control valve  
or other hydraulic components.  
6. Complete assembly of backhoe “pressure” and  
“return” hoses as shown in Figure 24 using hoses  
and tee fitting (supplied by customer).  
1. Install power beyond sleeve (1) into valve cavity,  
as shown in Figure 24 (Page 33), making sure that  
O-rings and back-up ring on sleeve are positioned  
properly and are not pinched or damaged.  
7. Complete assembly of loader “return” hose to tee  
fitting as shown.  
2. 665H and 765H - Assemble 90 degree O-ring  
adapter union (2) to power beyond sleeve (1) and  
direct fitting down through notch in Right Hand foot  
pad.  
8. Replace shroud using hardware removed in step  
1 of “Backhoe Preparation” section.  
33  
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Figure 24  
1
3
OUTLET  
INLET  
2
4
PRESSURE TO  
BACKHOE VALVE  
8
RETURN FROM  
BACKHOE VALVE  
TRACTOR PRESSURE  
“OUT” PORT  
PRESSURE TO  
LOADER VALVE  
INLET  
LOADER  
VALVE  
OUTLET  
TEE FITTING  
RETURN FROM  
LOADER VALVE  
TRACTOR  
RESERVOIR  
PORT  
3
2
2
662H & 762H BACKHOES  
862H & 962H BACKHOES  
34  
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PTO PUMP AND RESERVOIR KIT (Optional)  
er (14), 90 degree beaded fitting (20), and hose clamp  
General Description  
(24) as shown in Figure 25.  
The PTO Pump Kit consists of those parts required to  
power the backhoe from the tractor’s PTO shaft. It  
includes the PTO pump and adapter, reservoir, filtra-  
tion system, hydraulic hoses and fittings. In addition,  
it includes a pump plate which attaches to the tractor’s  
draw bar and keeps the pump from turning with the  
PTO shaft.  
6.1 or 8 GPM PTO PUMP KIT -  
Assemble suction hose (23) to pump (10), using reduc-  
er (28), reducer (14), 90 degree beaded fitting (20), and  
hose clamp (24) as shown in Figures 26.  
11. 4.5 GPM PTO PUMP KIT -  
Note: The speed of the backhoe operation increases  
as PTO speed increases.  
Connect 36” long pressure line (25) to steel oil line com-  
ing from the valve “IN” port fitting. Complete connection  
to pump using 90 degree adapter union (13) as shown  
in Figure 25.  
Assembly  
Note: When installing hoses and fittings always use  
thread sealant in permanent connections. Do not use  
thread sealant in union ends of adapters. Do not over-  
tighten fittings - they can split or expand, causing leakage.  
6.1 or 8 GPM PTO PUMP KIT -  
1. Assemble filler tube (19) and breather cap with dip-  
stick (18) to reservoir (16) as shown in Figure 25 & 26.  
Connect 36” long pressure line (25) to steel oil line com-  
ing from the valve “IN” port fitting. Complete connection  
to pump usign 90 degree adapter union (12) and reduc-  
er (13) as shown in Figures 26.  
2. Assemble reservoir (16) to backhoe using locknuts (3)  
as shown in Figures 25 & 26.  
IMPORTANT - If hoses are hooked up incorrectly, seri-  
ous damage to the backhoe valve will result.  
3. Preassembly of filter base and element (22):  
Remove filter element from base to ease installation.  
Assemble pipe nipple (26) to inlet port on filter base (22)  
as shown in Figures 25 & 26.  
12. NOTE: Initial fill up of the Reservoir Tank will require  
4-1/2 gallons of fluid. Fill reservoir with recommended  
fluid to correct level, referring to Service Section in the  
Backhoe Manual.  
Assemble 90 degree adapter union (5) to Outlet port on  
filter base (22) as shown in Figures 25 & 26.  
13. Mount the backhoe to the tractor at this time follow-  
ing the procedure in the Attaching Kit Manual.  
4. Assemble filter base (22) to reservoir (16) using 90  
degree pipe elbow (28 or 29) as shown in Figures 25 &  
26.  
14. Slide complete pump assemble onto the PTO shaft  
and secure with lock pin on PTO adapter. Be sure kinks  
do not develop in any of the lines. Suction hose can be  
shortened to prevent this problem.  
NOTE - Change filter element (11) every time oil is  
changed.  
CAUTION  
5. Assemble suction hose (23) to straight beaded fitting  
(21) using hose clamp (24). Connect assembly to 90  
degree adapter union (5) located on filter base and ele-  
ment (22) as shown in Figures 25 & 26.  
DO NOT REMOVE THE TRACTOR PTO GUARD  
15. Pump Plate (27) may be adjusted (flipped front to  
back or bottom to top) on pump (10) for proper fit-up to  
tractor drawbar or three point mount if necessary. The  
optimum position is to have the plate pointing down and  
over the drawbar with the offset towards the tractor.  
(Refer to illustration on following page)  
6. Connect 15” long return line hose (17) to steel oil line  
coming from the “OUT” port on backhoe control valve as  
shown in Figures 25 & 26.  
7. Complete return line connection to reservoir (16) using  
pipe bushing (6), and 90 degree adapter union (12) as  
shown in Figures 24 & 25. Reinstall filter element to filter  
base (22)  
An alternate position for the pump plate may have it  
pointed upwards and retained by the Upper Bar of the 3-  
Point Mount Kit. Whatever position is used by the Pump  
Plate, it is important that the pump be restrained from  
rotating. (Refer to illustration on following page)  
8. Assemble Pump Plate (27) to pump (10), using hard-  
ware provided (1, 4, 7), as shown in Figures 25 & 26.  
Pump Plate may have to be readjusted later.  
IMPORTANT - When mounting backhoe on the adapter,  
do not let the swing cylinders interfere with the backhoe  
pump, or the hydraulic lines become tangled in any part  
of the adapter during installation. Make sure both pres-  
sure and suction lines are free from kinks or twists to  
reduce back pressure and excessive heat built-up.  
9. Slide PTO adapter (15) onto pump shaft allowing 1/8  
inch between adapter and pump face and secure with  
two setscrews (9), as shown in Figures 25 & 26, lock with  
two nuts (2).  
10. 4.5 GPM PTO PUMP KIT -  
Assemble suction hose (23) to pump (10), using reduc-  
35  
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PUMP PLATE POSITIONS  
Pump Plate  
Pointing Up  
Figure 25  
4.5 GPM PUMP KIT  
18  
Pump Plate  
Pointing Down  
19  
16  
3
28  
26  
12  
6
14  
20  
22  
11  
FILTER  
ONLY  
9
2
9
2
24  
21  
24  
4
17  
FROM BACKHOE  
“RETURN”  
7
5
25  
10  
15  
13  
23  
27  
TO BACKHOE  
“PRESSURE”  
1
Figure 26  
6.1 GPM PUMP KIT  
or  
8 GPM PUMP KIT  
18  
19  
16  
3
29  
12  
14  
6
28  
20  
22  
11  
26  
FILTER  
ONLY  
9
2
9
24  
2
BACKHOE  
“RETURN”  
21  
24  
4
17  
7
5
13  
25  
12  
15  
23  
10  
TO BACKHOE  
“PRESSURE”  
27  
1
36  
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BACKHOES - DIMENSIONS AND SPECIFICATIONS  
SERIES  
665H  
7’0”  
765H  
8’0”  
865H  
9’0”  
965H  
10’1”  
Maximum Digging Depth  
A. Digging Depth (two foot flat bottom)  
B. Swing Arc  
6’6”  
7’6”  
8’6”  
9’7”  
180°  
180°  
180°  
180°  
C. Loading Height (bucket at 60°)  
D. Reach from Center Line of Swing Pivot  
E. Transport Height (maximum)  
F. Bucket Rotation  
5’0”  
5’10”  
6’10”  
7’8”  
8’6”  
9’6”  
11’1”  
12’5”  
4’11”  
5’9”  
6’9”  
7’10”  
180°  
180°  
180°  
180°  
G. Loading Reach (bucket at 60°)  
H. Transport Overhang  
3’2”  
3’7”  
3’7”  
4’11”  
3’5”  
3’6”  
4’0”  
5’1”  
I. Undercut  
2’4”  
2’6”  
2’10”  
2’11”  
J. Stabilizer Spread, down position  
K. Stabilizer Spread, up position  
Bucket Cylinder Digging Force  
Dipperstick Cylinder Digging Force`  
Shipping Weight (less bucket)  
Hydraulic Volume Requirements  
Hydraulic Pressure Requirements  
Recommended Tractor HP Requirements  
6’6”  
7’5”  
8’3”  
9’3”  
3’11”  
5’1”  
4’6”  
6’0”  
2450 lbs.  
1250 lbs.  
654 lbs.  
4 to 5 GPM  
2250 psi.  
18 - 35 HP  
2840 lbs.  
2005 lbs.  
875lbs.  
5 to 6 GPM  
2250 psi.  
25 - 45 HP  
3730 lbs.  
2435 lbs.  
1040 lbs.  
5 to 8 GPM  
2525 psi.  
45 - 95 HP  
4575 lbs.  
3175 lbs.  
1620 lbs.  
6 to 9 GPM  
2400 psi.  
55 - 100HP  
Specifications May Vary Depending on Tractor Model and are Subject to Change Without Notification. Tractors Must Be Equipped  
with ROPS and Seat belt That Will Provide Better Safety.  
37  
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REPOSITION STABILIZER CYLINDERS BEFORE  
REMOVING BACKHOE FROM SHIPPING PALLET  
Cylinder ports must be pointing upward and hoses routed above the cylinder to main-  
frame pivot pin connection.  
Models 665H and 765H  
Models 865H (Shown)  
&
965H  
38  
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NOTICE:  
INSTRUCTIONS FOR MOUNTING BUSH HOG BACKHOES ON SKID STEER LOADERS  
COME WITH THE INDIVIDUAL MOUNTING KITS. THE EXAMPLE SHOWN BELOW IS  
A MODEL 865H MOUNTED ON A JOHN DEERE MACHINE.  
39  
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®
BUSH HOG, L.L.C.  
P.O. Box 1039  
Telephone (334) 874-2700 www.bushhog.com  
G
Selma, AL 36702-1039  
GG  
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