Bush Hog 865H Operator`s manual

®
BUSH HOG
BACKHOES
Operator’s Manual
MODELS 665H / 765H / 865H / 965H
ASSEMBLY • OPERATION • MAINTENANCE
801
$4.00
50034063
CONGRATULATIONS!
You have invested in the best implement of its type on the market today.
The care you give your Bush Hog implement will greatly determine your satisfaction
with its performance and its service life. We urge a careful study of this manual to provide
you with a thorough understanding of your new implement before operating, as well as
suggestions for operation and maintenance.
If your manual should become lost or destroyed, Bush Hog will be glad to provide you with
a new copy. Order from Bush Hog, P. O. Box 1039, Selma, Alabama 36702-1039.
As an authorized Bush Hog dealer, we stock genuine Bush Hog parts which are
manufactured with the same precision and skill as our original equipment. Our trained
service personnel are well informed on methods required to service Bush Hog equipment,
and are ready and able to help you.
Should you require additional information or assistance, please contact us.
YOUR AUTHORIZED
BUSH HOG DEALER
BECAUSE BUSH HOG MAINTAINS AN ONGOING
PROGRAM OF PRODUCT IMPROVEMENT, WE
RESERVE THE RIGHT TO MAKE IMPROVEMENTS IN
DESIGN OR CHANGES IN SPECIFICATIONS WITHOUT INCURRING ANY OBLIGATION TO INSTALL
THEM ON UNITS PREVIOUSLY SOLD.
BECAUSE OF THE POSSIBILITY THAT SOME
PHOTOGRAPHS IN THIS MANUAL WERE TAKEN OF
PROTOTYPE MODELS, PRODUCTION MODELS MAY
VARY IN SOME DETAIL. IN ADDITION, SOME
PHOTOGRAPHS MAY SHOW SHIELDS REMOVED
FOR PURPOSES OF CLARITY. NEVER OPERATE
THIS IMPLEMENT WITHOUT ALL SHIELDS IN PLACE.
BACKHOES
Operator’s Manual
TABLE OF CONTENTS
SECTION/PARA
SECTION/PARA
PAGE
PAGE
Beginning of Season .................................14
Hydraulic System ......................................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
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
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 operator 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 submitted 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 avoided, 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.
1
CAUTION: Indicates a potentially
hazardous situation which, if not avoided, may result in minor or moderate
injury. It may also be used to alert
against unsafe practices.
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 replacement of defective parts.
Replacement or repair parts installed in the equipment covered by this limited warranty are warranted for ninety (90) days from the date of purchase of such part or to the expiration of the applicable new equipment warranty 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 judgement 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 LIMITED 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
2
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.
3
IMPORTANT SAFETY PRECAUTIONS
This symbol is used to call attention to safety precautions that should be followed by
the operator to avoid accidents. When you
see this symbol, carefully read the message
that follows and heed its advice. Failure to
comply with safety precautions could result
in serious bodily injury.
In addition to the design and configuration of equipment, hazard control and accident prevention are dependent upon the
awareness, concern, prudence and proper training of personnel in the operation, transport, maintenance and storage of
equipment. Lack of attention to safety can result in accident, personal injury, reduction of efficiency and worst of all—loss
of life. Watch for safety hazards and correct deficiencies promptly. Use the following safety precautions as a general
guide to safe operations when using this machine. Additional safety precautions are used throughout this manual for
specific operating and maintenance procedures. Read this manual and review the safety precautions often until you know
the limitations.
THE TRACTOR
1. Read the tractor operator’s manual to learn how to operate your tractor safely. Failure to do so could result in serious injury or death and equipment damage.
2. It is recommended that tractor be equipped with Rollover Protective System (ROPS) and a seat belt be used for all
loader operations.
3. Add wheel ballast or front weight for stability.
4. Move wheels to the tractor 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.
4
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 gangrene can develop if proper medical treatment is not administered immediately.
5
SAFETY DECALS
The safety of the operator was a prime consideration in the design of the backhoe. Proper shielding, convenient 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
665H BACKHOE
865H BACKHOE
765H BACKHOE
Location: Right Side Of Control Tower
6
965H BACKHOE
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 recommended 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.)
7
GENERAL OPERATION
Figure 1
Dipper-Stick
Safety Swing
Lock Position
Boom
Boom Safety
Lock Position
Mainframe
CAUTION
To avoid the possible
Bucket injury, observe the following safety rules BEFORE
Link
OPERATING the backhoe:
1. BE SURE area is clear of
underground utilities or
other hazards.
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 backhoe weight
must be on the tractor
Bucket front axle.
4. Keep bystanders a safe
distance away.
Stabilizer
Cylinder
Stabilizer
CONTROLS
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.
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.
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 permits. 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 position.
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 positions, the boom can be swung left or right at the same
it is being raised or lowered, performing the two operations 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.
8
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
3. Right Hand Stabilizer: Push lever forward, the RH
stabilizer lowers. Pull lever back, the RH stabilizer
raises.
CAUTION
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.
2. OPERATE from the backhoe operator’s seat
only.
3. LOWER the stabilizers until the rear of the tractor is totally supported by them. NOTE: rear tires
should not come up off of the ground. See diagram on Page 11.
4. DO NOT dig near the stabilizers.
5. DO NOT touch overhead wires with any part of
the backhoe.
6. DO NOT attempt to raise the tractor off the
ground or move the tractor forward or backward
using the backhoe dipperstick or bucket.
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.
Move lever to left, the bucket curls in. Move lever to
right, the bucket extends out.
By moving the lever to one of the intermediate positions, the dipperstick can be extended or retracted at
the same time the bucket is being loaded or dumped.
EXTEND AND LOAD the bucket by moving the lever
forward and to the left.
RETRACT AND LOAD the bucket by moving the
lever back and to the left.
EXTEND AND DUMP the bucket by moving the lever
forward and to the right.
RETRACT AND DUMP the bucket by moving the
lever back and to the right.
The two operations of the boom lever, combined with
the two operations performed by the bucket and dipperstick control lever, provide four simultaneous oper9
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 digging. Operating the crowd and bucket controls simultaneously will insure a full bucket and prevent waste
motion and time.
Operate the backhoe control levers to become familiar with their speed and movements. The engine
speed and the size of the hydraulic system will determine the speed of cylinder operation. When powering
from tractor systems with higher output than required,
reduce engine RPM to obtain acceptable backhoe
operating speed.
Transporting the Backhoe:
IMPORTANT: To prevent serious damage to the tractor, 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 gradually 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 operation 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
10
4. USE accessory lights and SMV emblem when traveling 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 dipperstick in, swinging to center and raising the stabilizers.
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 bucket 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
Note:
Bucket should be
lowered to bed
when possible.
DO NOT CHAIN BACKHOE DOWN IN ORDER
TO SECURE TRACTOR TO TRAILER
DO NOT attach hold down
chains anywhere on backhoe
assembly.
Block and secure
tractor only.
Placing the Stabilizers
Decreased
Digging
Depth
Stabilizers Properly Positioned
Narrower
Stabilizer
Platform
Stabilizers Improperly 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.
11
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.
IMPORTANT: Avoid constant jarring or hammering-type
contact between the spoil pile and the loaded bucket, as this
may cause premature wear to the backhoe pins and bushings.
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.
TRENCHING BETWEEN A BUILDING AND
OPEN EXCAVATIONS
Start the trench at the building. Trench out halfway to the
excavation. Then start trenching from the excavation to the
first trench. Dig toward the first trench until there is just
enough room to move the unit out between the two trenches.
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 centerline 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 trenches.
To obtain a cleaner trench and avoid the buildup of material directly in front of the backhoe, crowd out and completely curl the bucket while starting to lift it from the excavation.
In this way, excess material will fall back into the excavation.
Position the unit forward with the lift and 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 swinging it to the spoil pile.
12
General Operations
MISCELLANEOUS
When finishing straight walls or bellholes in sandy soil, use
a platform under the rear tires and the stabilizers. The platform distributes the load over a larger area and lessons the
possibility of a cave-in. The platform also tends to keep the
unit from creeping rearward if hard digging is encountered.
SIDE SLOPE EXCAVATING OR TRENCHING
Dig with the backhoe uphill whenever possible.
FINISHING STRAIGHT WALLS
Finish the far wall by crowding out while forcing the bucket
down from the boom. Actuate the bucket (curl out) to keep
the bottom of the bucket vertical.
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.
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
SERVICE
CAUTION
To avoid possible injury, observe the following
safety rules WHEN SERVICING the backhoe:
placing the unit under full load.
1. ENGAGE safety locks as shown in Figures 1 & 3
before servicing the backhoe.
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.
Bleeding Backhoe Hydraulic System
2. DO NOT oil, grease or adjust the backhoe while it
is in motion.
Hydraulic System Hoses
3. DO NOT change any backhoe relief valve settings.
They are factory set for best performance and safety.
Oil leaks in the pressure side of the system can be
located by carefully inspecting the external area of the
hoses and fittings.
Check the return side of the system for leaks by
examining the oil in the reservoir. If air is being drawn
into the system, the oil will contain air bubbles and
appear to foam.
When tightening connections, always use two
wrenches.
IMPORTANT: Do not over-tighten fittings. Make them
just tight enough to eliminate leaks.
NEVER use teflon tape on pipe thread fittings. Always
use a paste-type sealer.
Hoses on any backhoe are very severely worked and
will fail in time. Examine them regularly and replace
any that show signs of failure. Pay careful attention to
the routing of hoses so they can move fully and freely
without kinking, and cannot be pinched or cut by any
part of the backhoe.
4. ESCAPING FLUID under pressure can have sufficient force to penetrate the skin and cause serious
injury. Be sure to relieve all pressure before disconnecting lines. Be sure all connections are tight and
that lines, pipes and hoses are not damaged before
applying pressure to the system.
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 reservoir 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 cylinders are retracted except for the boom cylinder. Do not
overfill; oil may be forced out of the breather cap.
Fill with:
SAE 10W40 engine oil with API “SF/SG” classification in northern climates.
6. SEE A DOCTOR AT ONCE if injured by escaping
fluid. Serious infection or gangrene can develop if
proper medical treatment is not administered immediately.
7. PROTECT YOUR EYES - Wear safety glasses.
Guard against injury when driving connecting pins or
performing any repair in which particles can chip from
work piece or striking tool.
SAE 40W engine oil with API “SF/SG” classification
in southern climates.
Change oil every 200 hours or more often if necessary.
If the tractor system supplies the hydraulic power, service 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 necessary, 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
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
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
③
②
①
①
①
①
➂
➀
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.
**
➀
➀
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.
Tightening Nuts and Bolts
➀
➀ ➀*
Periodically, check to be sure all bolts and nuts are
tight. See torque chart, page 28 .
➀
Check all pivot pins for cotter pins, washers and
retainers; if missing, replace.
➀
**
➀
➀
➀
➀
➀
➀
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.
①
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
①
①
③
All parts provided with grease fittings should be lubricated with a good quality chassis lube type grease. If
any grease fittings are missing, replace them immediately. Clean all fittings thoroughly before using grease
gun.
①
①
①
①
Lubricate all grease fittings at least twice daily, once
at the beginning of operation and again approximately halfway through the work day.
①
Figure 6 - Lubrication Points for Model 665H
①
①
①
①
①
①*
①
①
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
③
*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
On Models 665H, 765H, 865H and 965H the following locations should be oiled with SAE30 oil:
①
①
①
A. Stabilizer Pivot Pins
B. Control Handle Linkage
C. Seat Bracket Pivot
①
Figure 7 - Lubrication Points for Model 765H
15
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.
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.
b. On systems that tap into the tractor for hydraulic
power, these lines can be disconnected now.
IMPORTANT: Be sure to mark the lines to prevent
mix-up, during hook-up, when the hoe is again
attached to the tractor.
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.
9. Refer to the installation instructions for the attaching kit. This will help with the removal and reattaching.
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.
1. Install the swing safety lock pin as shown in
Figures 1 and 3.
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.
3. Raise the backhoe operator’s seat to the raised
position.
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.
Note: To facilitate this procedure, the backhoe can still
be hydraulically moved, raised or lowered, to release
the connection points of the carrying forces.
6. Gently lower the backhoe onto the blocking as indicated in Figure 9. Leave the stabilizers outstretched
and firmly in contact with the ground for added stability.
7. The hydraulic system can now be disconnected.
16
Stabilizer Pads - 765H, 865H and 965H
Problems and Possible Causes, Continued
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.
D. Loss of power in any one cylinder including lift
and crowd - 8, 9, 10, 11, 12, 13, 23, 25, 26
E. Loss of power in swing cylinders, but other cylinders 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
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
Figure 10
Causes and Corrections
Hydraulic Trouble Shooting
1. Low oil supply in reservoir - fill to proper level.
2. No oil supply to machine - oil is not being diverted
from the prime mover hydraulic system. Be sure
that the proper controls are actuated on the prime
mover.
3. Air in system - bleed all circuits of air by operating
machine at maximum oil flow and through full
movements.
4. Oil viscosity too heavy, or oil is not at operating
temperature - use recommended hydraulic fluid.
Run machine until oil reaches operating
temperature.
5. Pump not running - check pump drive to be sure it
is engaged.
6. Insufficient pumping - advance engine throttle.
The trouble shooting material presented in this section is offered as a guide to diagnosing probable causes and remedies for general operational problems.
Match your problem with the typical problem examples given, and note the numbers given for the possible cause. These numbers correspond with the possible cause and correction paragraphs that follow.
NOTE: When using the following chart, if it is decided
that an overhaul of components or pressure adjustments are necessary to correct malfunctioning, it is
recommended that your dealer make these repairs.
He is equipped to do this work.
WARNING
Escaping hydraulic / diesel fluid under pressure
can penetrate the skin causing serious injury.
7. Improper hose connection - IMPORTANT: Be sure
inlet and return hoses are hooked up correctly.
Improper hook-up will result in damage to the
backhoe valve.
8. Loose oil line connections, leaks in line or broken
lines - tighten all hose connections and replace
any damaged O-rings at leaking O-ring fittings.
Check and replace any damaged hoses and lines.
9. Restrictions in oil lines - check and replace any
damaged hoses and lines. Check for pinched
hoses.
10. Oil is bypassing cylinder piston, scored piston,
worn piston packing, or defective piston
assembly - replace or rebuild the cylinder;
replace damaged parts.
11. Scored piston rods and worn rod guides in
cylinder - replace or rebuild the cylinder; replace
damaged parts.
Do not use your hand to check for leaks. Use a
piece of cardboard or paper to check for leaks.
Stop engine and relieve pressure before connecting or disconnecting lines.
Tighten all connections before starting engine or
pressurizing lines.
If any liquid is injected into the skin, obtain medical attention immediately or gangrene may result.
Problems and Possible Causes
A. Machine fails to operate when started initially - 1,
2, 5, 7, 16, 24
B. Machine loses power after operating satisfactorily
initially - 1, 8, 10, 14, 16, 24
C. Loss of power in lift or crowd cylinder, but other
cylinders function properly - 23, 25, 30
Continued
17
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.
14. Diverter valve on prime mover leaking externally
or bypassing oil internally through valve to
reservoir - diverter valve may need rebuilding or
replacing.
15. Something jamming the swing linkage - remove
interference.
16. Excessive back pressure - relieve condition. May
be restriction from outlet to reservoir.
17. Paint on valve spool; sticking valve spool or
scored valve spool - clean valve spool. Binding is
usually caused from an over tightened plug,
mounting bolt, fitting in valve body or tie rod bolt.
If a plug or fitting in the valve body is leaking, do
not over tighten in an effort to stop leak. This will
distort body casting and cause spools to bind.
Instead, the plug and fitting should be removed
from valve body and be reconnected, using a
new O-ring. Do not apply excessive pressure on
mounting bolts. The rods should be torqued to
20 ft./lbs. Never force spool, if binding occurs see
item 30 at the end.
18. Oil leakage past spool seal into spool cap remove cap. If it contains oil replace spool seal
O-rings. Check O-ring retainer to be sure it is
flat. If it has been “belled” check for restriction
from outlet to reservoir of valve which would
cause excessive back pressure. See item 30 at
the end and item 9.
19. Broken return springs - replace springs, see item
30 at the end and Figure 11.
20. Bent spool - replace with new spool section. See
item 30 at the end.
21. Foreign particles - clean system and valve.
22. Misalignment of control handle linkage - check
linkage for binding condition.
23. Spool not moved to full stroke - check travel,
should be 5/16” either way, or a total of 5/8”. See
item 30 at the end.
24. Relief valve setting in backhoe control valve too
low or defective - relief pressure will have to be
checked and corrections made. Backhoe system
pressure is 2100 psi 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.
28. Damaged or worn spool seals - replace spool
end seals, see item 30 at the end.
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.
30. Problems involving the control valve proper:
This valve is a precision device and is not intended for any extensive field adjustment or repair.
Field replacement parts are limited to seal kits,
cartridges, valve sections and tie rods.
Replacement of these parts, the opening of
check cavities and certain relief valve cavities to
examine for trapped dirt, or the resetting of the
main relief valve with the use of good pressure
gauge, should be referred to qualified service
personnel.
Dirt and shreds of packing material are the usual
causes of valve malfunction. Be sure the reservoir oil supply is kept clean and only factory supplied packings are used in cylinder repair. Everything must be clean and free of dirt during the
oil line removal and replacement, and during any
cylinder work.
Pages 19 and 20, Valve Repair-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.
18
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
SPRING
COLLAR
O-RING SEAL
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
SCREW, 1/4-20 x 7/8
LOCKWASHER
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 Orings 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 disassembly and assembly.
Replacing Spool Seals:
5. Remove the 3 tie rod nuts from the right end section, 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
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 assembly parts which are connected to the spool. Keep
parts in the order of disassembly. See Figure 11 for
the parts involved in the make-up of the bonnet
assembly.
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 disassembled 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 driver through the clevis slot, or by running a rod through
the pin hole and using the rod as a handle. DO NOT
hold the spool with a wrench. This will destroy the finish.
8. At the FRONT of the valve remove all parts connected to the spool (handle, linkage, etc.).
9. At the FRONT of the valve remove seal plate retainer, 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.
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.
6. Install new seals:
A. Spring-Centered Bonnet Assembly Only:
12. Reattach all parts connected to the spool (handle,
linkage, etc.).
Lightly oil new O-ring seal. Slide O-ring seal over
ASSEMBLY
Basic components for all models can be identified in Figure 12. Refer to Page 38 for photographs of units on their shipping pallets.
General:
Assembly(865H & 965H) - Figure 12
The backhoe has been partially disassembled and
strapped to a skid for shipping purposes. Initial installation on the tractor will require a hoist or other device
capable of safely lifting the entire backhoe from the skid.
After the initial installation is complete, the backhoe can
serve as its own erecting hoist, by lowering stabilizers
and bucket to the ground. Additional lifting devices will
not be required for normal removal and reattaching.
IMPORTANT: Tighten all hardware to torque requirements specified in torque chart.
1. Remove the stabilizer assemblies and any miscellaneous
items which have been fastened to the skid and arrange
conveniently. Reposition Stabilizer Cylinders from their shipping configuration, 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
E
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.
I
D
CAUTION
G
Be sure hoist being used is suitable, has sufficient capacity and
is in the proper position. Do not
allow anyone under a backhoe
member supported by hoist.
H
F
20
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.
4. Attach bucket link (E) to bucket, using same hardware as listed for step #3.
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.
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 installation carefully and make sure that all members are correctly installed and securely fastened.
Assembly:(665H & 765H) - Figure 12
CAUTION
Be sure hoist being used is suitable, has sufficient capacity and is in the proper position. Do
not allow anyone under a backhoe member supported by hoist.
(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 backhoe 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 miscellaneous 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 strapping 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 installation carefully and make sure that all members are correctly 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.
IMPORTANT: If the 3-Point Kit is to be used with a
PTO & Reservoir Kit, the Reservoir Tank and it’s fittings should be installed before proceeding with the
3-Point installation.
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 Hookup section for further information. Pumps and reservoir kits are available as options.
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
using 3/4 x 4-1/2” bolt (9), flat washers (10), lockwasher (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.
ASSEMBLY (Refer to Figures 13 & 14)
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 downward 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), lockwasher (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 installation very carefully to be sure all members are correctly 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 backhoe 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.
5. Secure upper bar (14) between upper braces (7)
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.
Figure 13
Tractor Upper
Link Weldment
Upper Brace
Upper Bar
Backhoe Mainframe
Boom Pivot Pin
C
Link Weldment
22
Tractor Lower Link
Figure 14
(665H & 765H)
11
9
10
14
7
8
10
20
12
13
19
16
7
10
9 11 1
10
11
18
10
17
9
9
2
10
15
6
5
3
4
ATTACHING KIT INSTRUCTIONS (For 865H)
3-POINT HITCH LINKAGE & HYDRAULIC HOOK-UP
TO TRACTOR HYDRAULIC SYSTEMS
General Description
link to the backhoe mainframe, locking the hoe rigidly in one position.
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 fittings 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
Figure 15
14
12 11
7
9
10 13
26
24
16 17
25
8
22
28
29
15
23
27
36 35
25
25
3
37
24
33
26
22
35
30
24
6
38
32
1
25
34
25
26 25
2
31
21
4
5
20 19
ASSEMBLY
18
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.
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 mainframe 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), lockwasher (24) and nut (26). 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 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 13/4” bolts (15), lockwashers (16), and nuts (17).
24
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 backhoe 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 completed. See Figure 15.
13. Tighten all hardware at this time. Check your
installation very carefully to be sure all members are
Hydraulic Hook-Up
The decal shown below is located on the Left Hand
toe shield.
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 backhoe 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 system, and whether the tractor has an open-center system (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 connecting backhoe to tractor hydraulic system.
25
Note: Do not connect hoses from the backhoe control valve to the tractor hydraulic system until initial
assembly of mounting kit is complete.
Note: The surge relief valve is not supplied with the
backhoe or mounting kit and must be ordered separately to complete this type hydraulic hook-up.
1. OPEN-CENTER SYSTEM WITH LOADER
VALVE OR OTHER ACCESSORY VALVE CONNECTED TO THE TRACTOR HYDRAULIC SYSTEM:
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 connecting 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 accidental 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.
When a loader valve or other accessory valve must
be connected to the tractor hydraulic system in addition 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-center 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 instructions on proper assembly.
Backhoe Valve
Coupler tip (not supplied) 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 closedcenter 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 tractor’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 reservoir, as shown in Figure 17.
Coupler tip (not supplied) 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 supplied) 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 characteristic 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.
B
Surge relief valve
Tractor reservoir
Hose supplied
by customer
26
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 perform at continuing maximum speed and efficiency.
There are two basic types of hydraulic systems, opencenter and closed-center. The open-center system constantly pumps oil through the hydraulic cylinder operating 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
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 running, 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.
Replace 2400 PSI relief valve (865H) or
2250 PSI (965H) with 2600 PSI relief
valve.
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.
Hook-Up Requirements
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:
3
2
1
Tractor
Coupler
Tip
5
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 damaging the backhoe control valve seals or tractor system. 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 maximum, 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 carefully 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
Figure 21
(965H)
207
217
213
207
210
220
221
216
210
210
203
206
205
208
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
General Description
link to the backhoe mainframe, locking the hoe rigidly in one position.
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 fittings 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
ASSEMBLY (Refer to Figure 21 & 22)
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 (217,218) ARE PROPERLY INSTEALLED AND ADJUSTED. FAILURE
TO DO SO MAY RESULT IN BACKHOE
BEING THRUST UPWARD, CRUSHING
OPERATOR AGAINST CAB OR ROPS.
1. Use hoist to raise the backhoe mainframe so that
the boom pivot pin is approximately 16” off the
ground.
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.
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.
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.
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.
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.
NOTE: If tractor has a category II hitch, install two bushings (215) in lower link arms as shoen 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.
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.
10A. If using optional PTO Pump and Reservoir Kit
proceed to that section 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.
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.
Figure 22
Tractor Upper
Link Weldment
Upper Brace
Upper Bar
Backhoe Mainframe
Boom Pivot Pin
C
Link Weldment
29
Tractor Lower Link
TORQUE VALUES
Common bolts and nuts
Size
Grade 2
Tightening Torque Plus/Minus 20%
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 backhoe valve and a loader valve, or other accessory, to
be connected to the tractor hydraulic system simultaneously, 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 constantly 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 procedure shows the recommended method for connecting 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 backhoe 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 conversion plug is the larger plug located lower on the right
side of the valve.
30
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 identification 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 positioned 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 pressure 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 convert 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
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)
Backhoe
Tractor
Pressure Outlet
Outlet
Plug
Inlet
Return Line
Pipe Tee
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
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 pressure 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 backhoe valve will require converting to a power beyond
valve. The power beyond pressue line from the backhoe valve will be connected to the input pressure port
of the loader valve. The power beyond kit for the backhoe 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 backhoe 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
Figure 24
1
3
OUTLET
2
4
INLET
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
PTO PUMP AND RESERVOIR KIT
(Optional)
er (14), 90 degree beaded fitting (20), and hose clamp
(24) as shown in Figure 25.
General Description
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, filtration 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 GPM PTO PUMP KIT Assemble suction hose (23) to pump (10), using reducer (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 coming 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 overtighten fittings - they can split or expand, causing leakage.
6.1 GPM PTO PUMP KIT -
1. Assemble filler tube (19) and breather cap with dipstick (18) to reservoir (16) as shown in Figure 25 & 26.
Connect 36” long pressure line (25) to steel oil line coming from the valve “IN” port fitting. Complete connection
to pump usign 90 degree adapter union (12) and reducer (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, serious 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 following 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 element (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 3Point 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 hardware 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 pressure 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 reduc35
PUMP PLATE POSITIONS
Figure 25
Pump Plate
Pointing Up
4.5 GPM PUMP KIT
18
Pump Plate
Pointing Down
19
3
16
28
12
14
6
20
26
22
11
FILTER
ONLY
FROM BACKHOE
“RETURN”
21
24
17
5
9
2
9 2
4
7
24
25
13
23
15
10
27
TO BACKHOE
“PRESSURE”
Figure 26
1
18
6.1 GPM PUMP KIT
19
3 16
29
12
14
6
22
11
28
26
FILTER
ONLY
BACKHOE
“RETURN”
17
5
21
24
4
7
12
23
9
36
9
2
24
13
25
15
10
TO BACKHOE
“PRESSURE”
2
20
27
1
BACKHOES - DIMENSIONS AND SPECIFICATIONS
SERIES
665H
765H
865H
965H
Maximum Digging Depth
7’0”
8’0”
9’0”
10’1”
A. Digging Depth (two foot flat bottom)
6’6”
7’6”
8’6”
9’7”
B. Swing Arc
180°
180°
180°
180°
C. Loading Height (bucket at 60°)
5’0”
5’10”
6’10”
7’8”
D. Reach from Center Line of Swing Pivot
8’6”
9’6”
11’1”
12’5”
E. Transport Height (maximum)
4’11”
5’9”
6’9”
7’10”
F. Bucket Rotation
180°
180°
180°
180°
G. Loading Reach (bucket at 60°)
3’2”
3’7”
3’7”
4’11”
H. Transport Overhang
3’5”
3’6”
4’0”
5’1”
I. Undercut
2’4”
2’6”
2’10”
2’11”
J. Stabilizer Spread, down position
6’6”
7’5”
8’3”
9’3”
K. Stabilizer Spread, up position
3’11”
5’1”
4’6”
6’0”
Bucket Cylinder Digging Force
2450 lbs.
2840 lbs.
3730 lbs.
4575 lbs.
Dipperstick Cylinder Digging Force`
1250 lbs.
2005 lbs.
2435 lbs.
3175 lbs.
Shipping Weight (less bucket)
654 lbs.
875lbs.
1040 lbs.
1620 lbs.
4 to 5 GPM
5 to 6 GPM
5 to 8 GPM
6 to 9 GPM
2250 psi.
2250 psi.
2525 psi.
2400 psi.
18 - 35 HP
25 - 45 HP
45 - 95 HP
55 - 100HP
Hydraulic Volume Requirements
Hydraulic Pressure Requirements
Recommended Tractor HP Requirements
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
REPOSITION STABILIZER CYLINDERS BEFORE
REMOVING BACKHOE FROM SHIPPING PALLET
Cylinder ports must be pointing upward and hoses routed above the cylinder to mainframe pivot pin connection.
Models 665H and 765H
Models 865H (Shown)
&
965H
38
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
®
BUSH HOG
, L.L.C.
P.O. Box 1039 ● Selma, AL 36702-1039
Telephone (334) 874-6960