®
BUSH HOG
Backhoe Models
CBH60 / CBH70 / CBH80
Operator’s Manual
l
l
ASSEMBLY OPERATION MAINTENANCE
06/09 Rev. 2
$4.00
50065802
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Operator’s Manual
BUSH HOG BACKHOE MODELS
CBH60, CBH70, CBH80
TABLE OF CONTENTS
SECTION/PARA
PAGE
SECTION/PARA
PAGE
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Dealer Preparation Check List. . . . . . . . . . . . . . 3
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . 5
Safety Decals. . . . . . . . . . . . . . . . . . . . . . . . . . 44
Federal Laws and Regulations . . . . . . . . . . . . . 8
General Operation . . . . . . . . . . . . . . . . . . . . . . . 9
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operating The Backhoe. . . . . . . . . . . . . . . . . . 10
Transporting The Backhoe . . . . . . . . . . . . . . . 12
Placing The Stabilizers . . . . . . . . . . . . . . . . . . 12
Filling The Bucket . . . . . . . . . . . . . . . . . . . . . . 13
Dumping The Bucket . . . . . . . . . . . . . . . . . . . . 13
Trenching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Back Filling . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Beginning Of Season. . . . . . . . . . . . . . . . . . . . 15
Hydraulic System. . . . . . . . . . . . . . . . . . . . . . . 15
Tooth Replacement . . . . . . . . . . . . . . . . . . . . . 16
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Removal / Storage . . . . . . . . . . . . . . . . . . . . . . 17
Stabilizer Pads . . . . . . . . . . . . . . . . . . . . . . . . . 18
Hydraulic Trouble Shooting . . . . . . . . . . . . . . . 18
Valve Repair CBH 60. . . . . . . . . . . . . . . . . . . . 25
Valve Repair CBH 70 & 80. . . . . . . . . . . . . . . . 26
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Mounting Kit Instructions . . . . . . . . . . . . . . . . . 29
PTO Pump Kits . . . . . . . . . . . . . . . . . . . . . . . . 36
Hydraulic Hook-Up To Tractor . . . . . . . . . . . . . 40
Power Beyond Kit. . . . . . . . . . . . . . . . . . . . . . . 42
Mechanical Thumb. . . . . . . . . . . . . . . . . . . . . . 47
Removing From Shipping Pallet. . . . . . . . . . . . 49
General Specifications . . . . . . . . . . . . . . . . . . . 50
Torque Specifications. . . . . . . . . . . . . . . . . . . . 45
RETAIL CUSTOMER’S RESPONSIBILITY
UNDER THE BUSH HOG WARRANTY
It is the Retail Customer and/or Operator’s responsibility to read the Operator’s Manual, to operate, lubricate,
maintain, and store the product in accordance with all instructions and safety procedures. Failure of the opera-
tor to read the Operator’s Manual is a misuse of this equipment.
It is the Retail Customer and/or Operator’s responsibility to inspect the product and to have any part(s) repaired
or replaced when continued operation would cause damage or excessive wear to other parts or cause a safety
hazard.
It is the Retail Customer’s responsibility to deliver the product to the authorized Bush Hog dealer from whom he
purchased it, for service or replacement of defective parts which are covered by warranty. Repairs to be submit-
ted 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.
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LIMITED WARRANTY
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
Bush Hog warrants to the original purchaser of any new Bush Hog equipment, purchased from an authorized
Bush Hog dealer, that the equipment be free from defects in material and workmanship for a period of one (1)
year for non-commercial, state, and municipalities’ use and ninety (90) days for commercial use from date of
retail sale. The obligation of Bush Hog to the purchaser under this warranty is limited to the repair or replace-
ment of defective parts.
Replacement or repair parts installed in the equipment covered by this limited warranty are warranted for nine-
ty (90) days from the date of purchase of such part or to the expiration of the applicable new equipment war-
ranty period, whichever occurs later. Warranted parts shall be provided at no cost to the user at an authorized
Bush Hog dealer during regular working hours. Bush Hog reserves the right to inspect any equipment or parts
which are claimed to have been defective in material or workmanship.
DISCLAIMER OF IMPLIED WARRANTIES & CONSEQUENTIAL DAMAGES
Bush Hog’s obligation under this limited warranty, to the extent allowed by law, is in lieu of all warranties,
implied or expressed, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE and any liability for incidental and consequential damages with respect to the sale or
use of the items warranted. Such incidental and consequential damages shall include but not be limited to:
transportation charges other than normal freight charges; cost of installation other than cost approved by Bush
Hog; duty; taxes; charges for normal service or adjustment; loss of crops or any other loss of income; rental of
substitute equipment, expenses due to loss, damage, detention or delay in the delivery of equipment or parts
resulting from acts beyond the control of Bush Hog.
THIS LIMITED WARRANTY SHALL NOT APPLY:
1. To vendor items which carry their own warranties, such as engines, tires, and tubes.
2. If the unit has been subjected to misapplication, abuse, misuse, negligence, fire or other accident.
3. If parts not made or supplied by Bush Hog have been used in connection with the unit, if, in the sole judge-
ment of Bush Hog such use affects its performance, stability or reliability.
4. If the unit has been altered or repaired outside of an authorized Bush Hog dealership in a manner
which, in the sole judgement of Bush Hog, affects its performance, stability or reliability.
5. To normal maintenance service and normal replacement items such as gearbox lubricant, hydraulic fluid,
worn blades, or to normal deterioration of such things as belts and exterior finish due to use or
exposure.
6. To expendable or wear items such as teeth, chains, sprockets, belts, springs and any other items that in the
company’s sole judgement is a wear item.
NO EMPLOYEE OR REPRESENTATIVE OF BUSH HOG IS AUTHORIZED TO CHANGE THIS LIM-
ITED WARRANTY IN ANY WAY OR GRANT ANY OTHER WARRANTY UNLESS SUCH CHANGE IS MADE
IN WRITING AND SIGNED BY BUSH HOG’S SERVICE MANAGER, 2501 GRIFFIN AVE., SELMA, ALABAMA
36703
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
MODEL NUMBER
Record the model number, serial number and date
purchased. This information will be helpful to your
dealer if parts or service are required.
SERIAL NUMBER
MAKE CERTAIN THE WARRANTY REGISTRATION
CARD HAS BEEN FILED WITH BUSH HOG/
DATE OF RETAIL SALE
SELMA, ALABAMA
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DEALER PREPARATION CHECK LIST
CBH60 - CBH70 - CBH80 BACKHOES
BEFORE DELIVERING MACHINE - The following check list should be completed.
Use the Operator’s Manual as a guide.
q Machine properly assembled.
q All safety decals readable (See decal page).
q All bolts tightened to torque specifications given in the torque chart.
q Machine operates properly.
q Operator’s manual has been delivered to owner and he has been instructed
on the safe and proper use of the backhoe.
Dealer’s Signature
CAUTION:
It is recommended that the tractor be equipped with Rollover
Protection System (ROPS) and seat belt be used for all
implement operations.
THIS CHECKLIST TO REMAIN IN OWNER’S MANUAL
It is the responsibility of the dealer to complete the procedures listed
above before delivery of this implement to the customer.
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Safety Alert Symbol
This Safety Alert Symbol means: “ATTENTION! BECOME ALERT!
YOUR SAFETY IS INVOLVED!”
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 death or seri-
ous bodily injury.
Safety Signs Signal Words
The signal words DANGER, WARNING, AND CAUTION are used on the equipment safety signs. These words
are intended to alert the viewer to the existence and the degree of hazard seriousness.
This signal word indicates a potentially hazardous situation
which, if not avoided, will result in death or serious injury.
White letters on RED
This signal word indicates a potentially hazardous situation
which, if not avoided, could result in death or serious injury
It may also be used to alert against unsafe practices.
Black letters on ORANGE
This signal word indicates a potentially hazardous situation exist
which, if not avoided, may result in minor or moderate injury.
It may also be used to alert against unsafe practices.
Black letters on YELLOW
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IMPORTANT SAFETY PRECAUTIONS
This symbol is used to call attention to safe-
ty precautions that should be followed by
the operator to avoid accidents. When you
see this symbol, carefully read the message
that follows and heed its advice. Failure to
comply with safety precautions could result
in serious bodily injury.
In addition to the design and configuration of equipment, hazard control and accident prevention are dependent upon the
awareness, concern, prudence and proper training of personnel in the operation, transport, maintenance and storage of
equipment. Lack of attention to safety can result in accident, personal injury, reduction of efficiency and worst of all—loss
of life. Watch for safety hazards and correct deficiencies promptly. Use the following safety precautions as a general
guide to safe operations when using this machine. Additional safety precautions are used throughout this manual for
specific operating and maintenance procedures. Read this manual and review the safety precautions often until you know
the limitations.
THE TRACTOR
1. Read the tractor operator’s manual to learn how to operate your tractor safely. Failure to do so could result in seri-
ous injury or death and equipment damage.
2. It is recommended that tractor be equipped with Rollover Protective System (ROPS) and a seat belt be used for all
loader operations.
3. Add wheel ballast or front weight for stability.
4. Move wheels to the tractor manufacturer’s widest recommended settings to increase stability.
5. For better stability, use tractor with wide front axle rather than tricycle front wheels.
6. Move and turn the tractor at low speeds.
7. Stop tractor engine, place transmission in park (or neutral), engage parking brake, lower loader arms to ground,
cycle all hydraulic controls to relieve pressure, allow machine moving parts to stop, remove ignition key to prevent
unauthorized person from starting engine before dismounting tractor or servicing, 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 or skid steer loader.
2. KNOW your controls. Read this operator’s manual and the manual provided with your tractor. Learn how to stop the
tractor, the engine and the backhoe quickly in an emergency.
3. PROVIDE adequate front end weight to counter-balance the backhoe at all times. 20% of the total tractor, loader and
backhoe weight must be on the tractor front axle. If unsure of weight distribution, determine at a weight scale. Total
vehicle weight , including backhoe and counter weights, must not exceed the ROPS certificate for gross vehicle weight.
4. BE SURE the area is clear of overhead or underground utilities or other hazards.
5. POSITION a barricade around the work area.
6. KEEP all bystanders a safe distance away.
7. DO NOT attempt to enter operator’s platform of backhoe by using the stabilizers as a step.
8. OPERATE from the backhoe operator’s seat only.
9. ALLOW only one person to operate the backhoe at any time.
10. DISENGAGE safety locks as shown in Figures 1 & 3 before attempting to operate the backhoe.
11. NEVER dig with the backhoe unless the stabilizers are properly set.
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SAFETY PRECAUTIONS CONTINUED
12. DO NOT dig under stabilizers or tractor backhoe. Soft ground or sandy soil can cause cave-ins.
13. KEEP BUCKET away from the stabilizer area to avoid possible stabilizer damage.
14. ALWAYS swing bucket uphill to dump when on a hillside and keep loaded bucket low.
15. SET BRAKES and block wheels when operating on hills and banks to avoid dangerous runaway.
16. WATCH for overhead wires. DO NOT touch wires with any part of the backhoe.
17. NEVER allow a person to work under a raised bucket.
18. NEVER lift a person with the backhoe.
19. DO NOT use the backhoe as a battering ram. Use the backhoe only for digging.
20. ALWAYS lower the backhoe bucket and stabilizers to the ground, shut off engine, and apply the parking
brake before getting off unit, or when not digging.
21. NEVER leave the tractor unattended with the engine running.
22. DO NOT attempt to raise the tractor off the ground or move the tractor forward or backward using the
backhoe dipperstick or bucket.
TRANSPORTATION
1. ALWAYS engage safety locks before transporting backhoe. See Figures 1 & 3.
2. DO NOT drive the tractor near the edge of a ditch or excavation.
3. ALWAYS use accessory lights and devices when transporting on a road or highway to warn operators of
other vehicles. Check your local government regulations.
4. BE SURE the SMV emblem is visible to the rear.
ADJUSTMENTS AND INSPECTION
1. CHECK pins that attach backhoe to tractor and all pivot pins for tightness several times daily. Replace any
parts that are bent, broken or missing.
2. ALWAYS engage safety locks before servicing backhoe. See Figures 1 & 3.
3. DO NOT oil, grease, or adjust the backhoe while it is in motion. For greasing, see Service section for details.
4. DO NOT change any backhoe relief valve settings. They are factory set for best backhoe performance and safety.
5. PROTECT YOUR EYES - WEAR SAFETY GLASSES.
6. GUARD AGAINST INJURY when driving connecting pins or performing any repair in which particles can
chip from work piece or striking tool.
7. DO NOT remove any guards on backhoe or tractor.
AVOID HIGH-PRESSURE FLUIDS
ESCAPING fluid under pressure can have sufficient force to penetrate the skin
and cause serious injury. Be sure to stop engine and relieve all pressure before
disconnecting lines. Be sure all connections are tight and that lines, pipes, and
hoses are not damaged before applying pressure to the system. Fluid escaping
from a very small hole can be almost invisible. Use a piece of cardboard or wood
- not your hands-to search for suspected leaks.
SEE A DOCTOR at once if injured by escaping fluid. Serious infection or gan-
grene can develop if proper medical treatment is not administered immediately.
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SAFETY DECALS
The safety of the operator was a prime consideration in the design of the backhoe. Proper shielding, conve-
nient controls, simple adjustments and other safety features have been built into this implement. The following
decals are located on the backhoe. Keep decals clean and replace them immediately if they are missing.
Contact your dealer or Bush Hog for replacements.
All Models
All Models
CBH 70
7
CBH 60
CBH 80
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IMPORTANT FEDERAL LAWS AND REGULATIONS* CONCERNING
EMPLOYERS, EMPLOYEES AND OPERATIONS.
*(This section is intended to explain in broad terms the concept and effect of the following federal laws and
regulations. It is not intended as a legal interpretation of the laws and should not be considered as such).
U.S. Public Law 91-596 (The Williams-Steiger Occupational Safety 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:
5. Watch where you are going, especially at row
ends, on roads, and around trees.
1. Securely fasten your seat belt if the tractor has a
ROPS.
6. Do not permit others to ride.
2. Where possible, avoid operating the tractor near
ditches, embankments, and holes.
7. Operate the tractor smoothly - no jerky turns,
starts, or stops.
3. Reduce speed when turning, crossing slopes,
and on rough, slick, or muddy surfaces.
8. Hitch only to the drawbar and hitch points recom-
mended by tractor manufacturers.
4. Stay off slopes too steep for safe operation.
9. When tractor is stopped, set brakes securely and
use park lock if available.
Child Labor Under 16 Years Old
Some regulations specify that no one under the age of 16 may operate power machinery. It is your
responsibility to know what these regulations are in your own area or situation. (Refer to U.S. Dept. of
Labor, Employment Standard Administration, Wage & Home Division, Child Labor Bulletin #102.)
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GENERAL OPERATION
Figure 1
!
CAUTION
To avoid possible injury,
observe the following
safety rules BEFORE
OPERATING the backhoe:
1. BE SURE area is clear
of underground utilities or
other hazards.
Swing
Lock Pin
Location
Bucket
Link
2. POSITION barricade
around work area.
3. PROVIDE adequate
front end weight to
counter-balance tractor at
all times. 20% of the total
tractor, loader and back-
hoe weight must be on the
tractor front axle.
Boom
Dipper-Stick
Mainframe
Bucket
4. Keep bystanders a safe
distance away.
Boom
Stabilizer
Cylinder
Transport
Lock Pin
Locations
Stabilizer
CONTROLS
DIRECTIONS: The terms right, left, front and back
shall be determined from the position of the operator
when seated in the operating position on the back-
hoe.
The backhoe has two major control levers plus the
stabilizer control levers. These controls are located
on the control console directly ahead of the operator.
See Figure 2. The following is a list of the controls,
with the function of each, reading from left to right.
Engine Speed
The speed at which the backhoe operates is partially
dependent on engine RPM. Use a moderate engine
speed to start and increase it as your experience per-
mits. Refer to “SPECIFICATIONS” for hydraulic flow
volume requirements. When powering from tractor
systems with higher output, reduce engine RPM to
obtain acceptable backhoe operating speed.
1. Left Hand Stabilizer: Push lever forward, the LH
stabilizer lowers. Pull lever back, the LH stabilizer
raises.
2. Boom/Swing: Push lever forward, the boom
moves down, away from the operator. Pull lever
back, the boom moves up, toward the operator.
Figure 2 Control Handles
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.
Crowd &
Bucket
Boom &
Swing
Right Hand
Stabilizer
Left Hand
Stabilizer
Move lever to the left, the backhoe swings to the left.
Move lever to the right, the backhoe swings to the
right.
By moving the lever to one of the intermediate posi-
tions, the boom can be swung left or right at the
same time it is being raised or lowered, performing
the two operations simultaneously.
SWING LEFT AND LOWER the boom by moving the
control lever forward and to the left.
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Figure 3 Safety Locks
Figure 3a
Lock Pins
Storage Locations
Swing Lock Pin
Boom Transport Lock Pin Location
In general, the direction of movement of a control
lever corresponds to the movement of the operating
member.
SWING LEFT AND RAISE the boom by moving the
control lever back and to the left.
SWING RIGHT AND LOWER the boom by moving
the lever forward and to the right.
OPERATING THE BACKHOE
!
CAUTION
SWING RIGHT AND RAISE the boom by moving the
lever back and to the right.
To avoid possible injury, observe the following
safety rules WHEN OPERATING the backhoe.
3. Crowd/Bucket: Push lever forward, the dipper-
stick moves out, away from the operator. Pull lever
back, the dipperstick moves in, toward the operator.
1. DISENGAGE safety lock pins as shown in
Figure 3 before attempting to operate the back-
hoe. Store lock pins in angled tubes located at
the rear right hand side of the backhoe below the
foot platform. See Figure 3a.
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 posi-
tions, the dipperstick can be extended or retracted at
the same time the bucket is being loaded or dumped.
2. OPERATE from the backhoe operator’s seat
only.
3. LOWER the stabilizers until the rear of the trac-
tor is totally supported by them. NOTE: Rear tires
should not come up off of the ground. See
Placing The Stabilizers diagram on Page 12.
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.
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.
EXTEND AND DUMP the bucket by moving the lever
forward and to the right.
RETRACT AND DUMP the bucket by moving the
lever back and to the right.
7. DO NOT lose stability by swinging the bucket
downhill when positioned on a slope.
8. DO NOT lower the backhoe boom using the
“float” function. It will free fall, and could result
in injury to bystanders or damage to the back-
hoe.
The two operations of the boom/swing lever, com-
bined with the two operations performed by the
crowd/bucket control lever, provide four simultaneous
operations from the two levers, keeping cycle time to
a minimum.
4. Right Hand Stabilizer: Push lever forward, the
RH stabilizer lowers. Pull lever back, the RH stabiliz-
er raises.
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Location: Back Of Control Panel
This dual operation of controls will speed and simplify
It is not difficult to become an efficient operator.
Control lever operating decal is located on back of
the control console. Study this decal. It will assist you
in becoming familiar with the controls.
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 famil-
iar with their speed and movements. The engine
speed and the size of the hydraulic system will deter-
mine the speed of cylinder operation. When powering
from tractor systems with higher output than
required, reduce engine RPM to obtain acceptable
backhoe operating speed.
TRANSPORTING THE BACKHOE
Swing the boom several times to practice controlling
the speed of swing. Do not operate the swing more
than 45° each way for the first few times, then gradu-
ally increase the arc.
IMPORTANT: To prevent serious damage to the
tractor, read and follow the instructions on the
following decal:
IMPORTANT: To avoid damage to the backhoe,
do not slam unit into the rubber bumpers when
swinging the boom right or left.
The boom “float” function may be used during digging
to eliminate down pressure when cleaning the bottom
of a trench. The primary purpose of the boom “float”
function is to protect the operator from serious injury
in the event that the backhoe or tractor hitch would
fail.
Best results are obtained by digging near the center
of the swing arc so material can be dumped on either
side.
As the operator becomes more familiar with the oper-
ation of the backhoe, it will be common practice to
operate two controls at one time. For example, with
the bucket extended and the dipperstick extended,
the lift control and crowd control can be operated
together to bring the bucket toward the operator with
down pressure on it. As the dipperstick approaches
the operator, the crowd and bucket controls can be
operated to close the bucket and trap the material. At
the end of the stroke, the lift and crowd controls are
operated to move the load up and away from the
operator to save time in clearing the excavation.
Location: Right Side of Boom
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4. USE accessory lights and SMV emblem when
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 dip-
perstick in, swinging to center and raising the stabiliz-
ers.
1. ALWAYS engage safety locks as shown on Figs. 1
and 3 when transporting backhoe.
2. TRAVEL SLOWLY over rough terrain, on hillsides,
and around curves to prevent tipping.
When transporting for long distances, periodically
examine the backhoe and raise stabilizers and buck-
et back up to the full transport height. It is normal for
the backhoe to slowly settle while being transported.
3. DO NOT drive the tractor near the edge of a ditch
or excavation.
WHEN TRANSPORTING ON A TRAILER
Figure 4
!
CAUTION
DO NOT CHAIN BACKHOE DOWN IN ORDER
TO SECURE TRACTOR TO TRAILER
Note:
Bucket should be
lowered to bed
whenpossible.
Block and secure
tractor only.
DO NOT attach hold down
chains anywhere on back-
hoe assembly.
PLACING THE STABILIZERS
Decreased
Digging
Depth
Narrower
Stabilizers Improperly Positioned
INCORRECT
Stabilizers Properly Positioned
CORRECT
Stabilizer
Platform
Set the stabilizers to remove weight from the rear wheels. The wheels are to remain touching the ground as this
provides for the widest stabilizer stance and the lowest center of gravity. Raising the wheels off the ground will not
only reduce stability and digging depth, but will impair performance and impose unnecessary stress on the unit.
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General Operations
As the pile is approached, dump the bucket. When the
bucket is empty, the dipperstick and bucket are in position
to resume digging upon return to the trench.
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 tren-
ches.
When digging in hard-packed soil, bucket penetration can
be increased by applying down pressure with the boom
while crowding in and curling the bucket. If the crowd
action “stalls” it may be necessary to apply lift occasionally
during the digging cycle to correct the bucket depth.
Position the unit so the backhoe swing post is over the
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 tren-
ches.
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 swing-
ing it to the spoil pile.
13
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General Operations
MISCELLANEOUS
When finishing straight walls or bellholes in sandy soil, use
a platform under the rear tires and the stabilizers. The plat-
form distributes the load over a larger area and lessens 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 trenches 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, or swing
cylinders and/or the mainframe.
14
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SERVICE
!
Hydraulic System Hoses
Oil leaks in the pressure side of the system can be
located by carefully inspecting the external area of
the hoses and fittings.
CAUTION
To avoid possible injury, observe the following
safety rules WHEN SERVICING the backhoe:
1. ENGAGE safety locks as shown in Figures 1 & 3
before servicing the backhoe.
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.
2. DO NOT oil, grease or adjust the backhoe while it
is in motion.
3. DO NOT change any backhoe relief valve settings.
They are factory set for best performance and safety.
When tightening connections, always use two
wrenches.
IMPORTANT: Do not over-tighten fittings. Make them
just tight enough to eliminate leaks.
4. ESCAPING FLUID under
NEVER use teflon tape on pipe thread fittings.
Always use a paste-type sealer.
pressure can have sufficient
force to penetrate the skin
and cause serious injury. Be
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.
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 pres-
sure 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 systems, maintain the reservoir oil at
the proper level by looking at the dipstick. The dip-
stick/breather cap is located directly behind the right
side of the foot platform 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.
6. SEE A DOCTOR AT ONCE if injured by escaping
fluid. Serious infection or gangrene can develop if
proper medical treatment is not administered immedi-
ately.
7. PROTECT YOUR EYES - Wear safety glasses.
Guard against injury when driving connecting pins or
performing any repair in which particles can chip
from work piece or striking tool.
Fill with:
SAE 10W40 engine oil with API “SF/SG” classifica-
tion in northern climates.
BEGINNING OF SEASON
Remove all protective coverings.
SAE 40W engine oil with API “SF/SG” classification
in southern climates.
Change oil every 200 hours or more often if neces-
sary. To change oil, extend backhoe to full reach with
bucket rolled back and resting on ground. Turn off
tractor PTO and shut down tractor engine. Drain oil
from reservoir and replace drain plug. Refill reser-
voir with 4 gallons of fresh oil following guide-
lines listed above for proper oil selection. Reseat
breather cap and start engine and PTO. After cycling
all backhoe functions several times to remove any air
from hydraulic system, check oil level in reservoir
with backhoe extended to full reach and bucket rolled
back and resting on ground. If oil level on dipstick is
below “ADD” line, add enough oil to bring level up to
“FULL” line. DO NOT overfill reservoir or oil may be
forced out through breather cap during backhoe
operation.
Check hydraulic hoses for deterioration and replace,
if necessary.
Lubricate all grease fittings and oil handle linkages.
Check hydraulic system for loss of fluid and, if neces-
sary, fill to proper level.
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
placing the unit under full load.
Bleeding Backhoe Hydraulic System
If the hydraulic hoses have been disconnected from
the backhoe or tractor, all trapped air must be
removed after the hoses are connected. Start tractor
engine and operate backhoe through all movements
fully several times to purge the system of air.
If the tractor system supplies the hydraulic power,
service according to the tractor instruction manual.
15
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TOOTH REPLACEMENT
Tightening Nuts and Bolts
The bucket tooth points are shelf-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.
Periodically, check to be sure all bolts and nuts are
tight. See torque chart, page 51 .
Check all pivot pins for cotter pins, washers and
retainers; if missing, replace.
LUBRICATION
IMPORTANT: Avoid excessive greasing. Dirt collects
on exposed grease and increases wear greatly. After
greasing, wipe off excessive grease from fittings.
Peened-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.
Bolt-On tooth points, when worn, can be replaced by
removing the hardware that connects it to the cutting
edge. Install new tooth and replace hardware if nec-
essary. (Figure 6)
Economical and efficient operation of the backhoe is
dependent upon regular and proper lubrication of all
moving parts with a quality lubricant.
All parts provided with grease fittings should be lubricat-
ed 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.
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.
(Figure 7)
Lubricate all grease fittings at least twice daily, once
at the beginning of operation and again approximate-
ly halfway through the work day.
Tooth Point Tooth Shank
Figure 5
Peened-On Tooth
A
B
Lower stabilizers to the ground and lower boom so
bucket rests on the ground as shown in Figures 8.
Refer to these illustrations for the location of all
grease fittings.
Peen Metal Into Tooth Shank Recess
Nut
IMPORTANT: Before greasing boom to swing
frame pivot (*) shown in Figures 8, raise boom and
install transport lock pin shown in Figure 1.
Figure 6
Bolt-On Tooth
On Models CBH60, CBH70, CBH80 the following
Bolt
Point
locations should be oiled with SAE30 oil:
A. All Control Handle Linkages
B. Seat Bracket Pivot
Figure 7
Roll-Pin Tooth
Roll-Pin
Point
Figure 8
Lubrication Points
1
1
1
1
1
3
1
1
2 - Model CBH70, 80
1 - Model CBH60
1
1
2 - Model CBH70, 80
0 - Model CBH60
1
2 - Model CBH70, 80
1 - Model CBH60
16
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REMOVAL FROM TRACTOR - STORAGE
Figure 9
Backhoe Fully Extended
Place Blocking Under
Backhoe Frame For Support
The backhoe is self-assisting during the installation
!
CAUTION
and removal procedures. For removal and storage,
follow these steps:
Make sure tractor PTO is disengaged and engine
shut off before disconnecting pump or hydraulic
lines.
1. Install the swing safety lock pin as shown in
Figures 1 and 3.
a. On PTO pump self-contained systems, the pump
should be removed from the PTO shaft. The
hydraulic system should always remain complete. No
hoses or oil lines should be disconnected during cor-
rect removal and storage procedure.
2. Stretch out the boom, dipper stick 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.
b. On systems that tap into the tractor for hydraulic
power, these lines can be disconnected now.
4. Place suitable blocking under the backhoe frame
to support it adequately as indicated in Figure 9.
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.
5. Detach the backhoe from the tractor mechanically
only, not hydraulically at this point. Move the tractor a
few inches away from the backhoe.
8. Now slowly drive the tractor forward and away
from the backhoe. Be careful that all parts clear each
other during separation.
Note: To facilitate this procedure, the backhoe can
still be hydraulically moved, raised or lowered, to
release the connection points of the carrying forces.
9. Refer to the installation instructions for the attach-
ing kit. This will help with the removal and reattach-
ing.
6. Gently lower the backhoe onto the blocking as
indicated in Figure 9. Leave the stabilizers out-
stretched and firmly in contact with the ground for
added stability.
10. For long term storage, coat exposed lift, swing
and stabilizer cylinder rods with grease.
7. The hydraulic system can now be disconnected.
11. Lubricate all grease fittings and oil all handle link-
ages and seat bracket pivot.
17
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Figure 10
STABILIZER PADS
The backhoe is supplied with flip-over stabilizer feet
(Excluding Model CBH60) as standard equipment.
They are suitable for most backhoe work and gener-
ally are all that is ever required. However, foot pad
kits are available as options. These kits bolt to the
standard feet and increase the versatility of the back-
hoe. See Figure 10.
Hydraulic Trouble Shooting
!
WARNING
The trouble shooting material presented in this sec-
tion is offered as a guide to diagnosing probable
causes and remedies for general operational prob-
lems. Match your problem with the typical problem
examples given, and note the possible cause and the
proper corrective action.
Escaping hydraulic / diesel fluid under pressure
can penetrate the skin causing serious injury.
Do not use your hand to check for leaks. Use a
piece of cardboard or wood to check for leaks.
NOTE: When using the following chart, if it is decided
that an overhaul of components or pressure adjust-
ments are necessary to correct malfunctioning, it is
recommended that your dealer make these repairs.
He is equipped to do this work.
Stop engine and relieve pressure before connect-
ing or disconnecting lines.
If any liquid is injected into the skin, obtain med-
ical attention immediately or gangrene may
result.
TROUBLESHOOTING PROCEDURES
Problem
Cause
Correction
Machine fails to operate
when started initially
Low oil supply in reservoir
No oil supply to machine
Fill to proper level.
Oil is not being diverted from the
prime mover hydraulic system.
Be sure that the proper controls are
actuated on the prime mover.
Pump not running
Check pump drive to be sure it is
engaged.
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.
Excessive back pressure
Relieve condition. Restriction may be
from outlet to reservoir.
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 2000 PSI (CBH60),
2250 PSI (CBH70), 2550 PSI (CBH 80).
Relief valve may need cleaning and or
overhauling or entire cartridge must be
replaced.
Machine loses power after
operating satisfactorily
initially
Low oil supply in
reservoir
Fill to proper level.
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.
Oil is bypassing cylinder piston,
scored piston, worn piston
packing, or defective piston
assembly
Replace or rebuild the cylinder; replace
damaged parts.
18
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TROUBLESHOOTING (Continued)
Problem
Cause
Correction
Machine loses power after
operating satisfactorily
initially
Diverter valve on prime move
leaking or bypassing oil internally
through valve to reservoir
Diverter valve may need rebuilding or
replacing.
Excessive back pressure
Relieve condition. Restriction may be
from outlet to reservoir.
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 2000 PSI (CBH60),
2250 PSI (CBH70), 2550 PSI (CBH80),
Relief valve may need cleaning and
overhauling, or entire cartridge must be
replaced.
Loss of power in lift or
crowd cylinder, but other
cylinders function properly
Spool not moved to full stroke
Check spool travel - should be .16”
either way or a total of .32” for CBH60.
Check spool travel- should be .28”
either way, or a total of .56”. for
CBH70 and CBH80.
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.
Problems involving the control
valve
This valve is a precision device and is
not intended for any extensive field
adjustment or repair. Field replace-
ment parts are limited to seal kits,
cartridges, valve sections and tie rods.
Replacement of these parts, the
opening of check cavities and certain
relief cavities to examine for trapped
dirt, or 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 oil line removal and
replacement, and during any cylinder
work.
Loss of power in any one
cylinder, including lift
and crowd
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.
Restrictions in oil lines
Check and replace any damaged hoses
and lines. Check for pinched hoses.
Oil is bypassing cylinder piston,
scored piston, worn piston packing
or defective piston assembly
Replace or rebuild the cylinder; replace
damaged parts.
19
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Troubleshooting (Continued)
Problem
Cause
Correction
Loss of power in any one
cylinder, including lift
and crowd (cont.)
Scored piston rods and worn
guides in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Bent piston rod in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Worn or damaged rod seals on
cylinder; external leaks
Repack cylinder. Rebuild cylinder,
replacing damaged parts as necessary.
Spool not moved to full stroke
Check spool travel - should be .16”
either way, or a total of .32” for CBH60.
Spool travel should be .28” either way,
or a total of .56” for CBH70 CBH80.
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.
Worn control valve
Replace the control valve.
Loss of power in swing
cylinders, but other
cylinders functioning
properly.
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.
Restrictions in oil lines
Check and replace any damaged hoses
and lines. Check for pinched hoses.
Oil is bypassing cylinder piston,
scored piston, worn piston
packing, or defective piston
assembly
Replace or rebuild the cylinder; replace
damaged parts.
Scored piston rods and worn
guides in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Bent piston rod in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Worn or damaged rod seals on
cylinder; external leaks
Repack cylinder. Rebuild cylinder,
replacing damaged parts as necessary.
Spool not moved to full stroke
Check spool travel - should be .16”
either way, or a total of .32” for CBH60.
Spool travel should be .28” either way,
or a total of .56” for CBH70 CBH80.
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 2000 PSI (CBH60),
2250 PSI (CBH70), 2550 PSI (CBH80),
Relief valve may need cleaning and or
overhauling or entire cartridge must be
replaced.
Worn control valve
20
Replace the control valve.
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Troubleshooting (Continued)
Problem
Cause
Correction
Maximum swing action
cannot be obtained
Bent piston rod in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Something jamming the swing
linkage
Remove interference.
Slow operation of machine
(lack of power) all cylinders
Low oil supply in reservoir
Fill to proper level.
Oil viscosity too heavy, or oil
is not at operating temperature
Use recommended hydraulic fluid. Run
machine until oil reaches operating
temperature.
Insufficient pumping
Advance engine throttle.
Divertor valve on prime mover
leaking externally or bypassing
oil internally through valve to
reservoir.
Divertor valve may need rebuilding or
replacing.
Excessive back pressure
Relieve condition. Restriction may be
from outlet to reservoir.
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 2000 PSI (CBH60),
2250 PSI (CBH70), 2550 PSI (CBH80),
Relief valve may need cleaning and
overhauling, or entire cartridge must be
replaced.
Spongy or jerking action
of cylinders and/or noisy
operation
Low oil supply in reservoir
Air in system
Fill to proper level.
Bleed all circuits of air by operating
machine at maximum oil flow and
through full movements.
Oil viscosity too heavy, or
oil is not at operating
temperature
Use recommended hydralic fluid. Run
machine until oil reaches operating
temperature.
Pump not running
Check pump drive to be sure it is
engaged.
Lift, crowd or bucket
cylinders drop under load
when control spools
shifted from neutral
Damaged or worn spool
seals
Replace spool end seals.
Problems involving the control
valve
This valve is a precision device and is
not intended for any extensive field
adjustment or repair. Field replace-
ment parts are limited to seal kits,
cartridges, valve sections and tie rods.
Replacement of these parts, the
opening of check cavities and certain
relief cavities to examine for trapped
dirt, or resetting of the main relief valve
with the use of good pressure gauge,
should be referred to qualified service
personnel.
21
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Troubleshooting (Continued)
Problem
Cause
Correction
Lift, crowd or bucket
cylinders drop under load
when control spools
shifted from neutral
Problems involving the control
valve (cont.)
Dirt and shreds of packing material are
the usual causes of valve malfunction.
Be sure the reservoir oil supply is kept
clean and only factory supplied packing
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.
Load drops or settles
Loose oil line connections,
leaks in line or broken lines
Tighten all hose connections and replace
replace any damaged o-rings at leaking
o-ring fittings. Check and replace any
damaged hoses and lines.
Oil is bypassing cylinder piston,
scored piston, worn piston
packing, or defective piston
assembly
Replace or rebuild the cylinder; replace
damaged parts.
Worn or damaged rod seals on
cylinder; external leaks
Repack cylinder. Rebuild cylinder,
replacing damaged parts as necessary.
Worn control valve
Replace the control valve.
Replace spool end seals.
Damaged or worn spool seals
Leaky cylinders
Oil is bypassing cylinder piston,
scored piston, worn piston
packing, or defective piston
assembly
Replace or rebuild the cylinder; replace
damaged parts.
Scored piston rods and worn
guides in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Bent piston rod in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Worn or damaged rod seals on
cylinder; external leaks
Repack cylinder. Rebuild cylinder,
replacing damaged parts as necessary.
Leaky valve
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.
Excessive back pressure
Relieve condition. Restriction may be
from outlet to reservoir.
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 overtighten
in an effort to stop leak. This will distort
body casting and cause spools to bind.
(cont.)
22
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Troubleshooting (Continued)
Problem
Cause
Correction
Leaky valve
Paint on valve spool; sticking
(cont.)
valve spool or scored valve spool 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 for CBH70, CBH80 should
be torqued to 14 ft/lbs for 5/16” nuts and 33
ft/lbs for 3/8” nuts. Never force spool.
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.
Sticky valve spool
spool in
Paint on valve spool; sticking
valve spool or scored valve
spool
Clean valve spool. Binding is usually
caused from an overtightened plug,
mounting bolt, fitting in valve body or
tie rod bolt. If a plug or fitting in the valve
body is leaking, do not overtighten 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 exces-
sive pressure on mounting bolts. The rods
for CBH70, CBH80 should be torqued to 14
ft/lbs for 5/16” nuts and 33 ft/lbs for 3/8”
nuts. Never force spool.
Bent spool
Replace with new spool section.
Clean system and valve.
Foreign particles
Misalignment of control handle
linkage
Check linkage for binding condition
Unable to push valve
spool in
Paint on valve spool; sticking
valve spool or scored valve
spool
Clean valve spool. Binding is usually
caused from an overtightened plug,
mounting bolt, fitting in valve body or
tie rod bolt. If a plug or fitting in the valve
body is leaking, do not overtighten 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 exces-
sive pressure on mounting bolts. The rods
for CBH70, CBH80 should be torqued to 14
ft/lbs for 5/16” nuts and 33 ft/lbs for 3/8”
nuts. Never force spool.
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. If supply and return lines are
reversed, pressure on low pressure / return
side of valve will cause problem.
Make sure hoses are connected correctly
at bulkhead connection on backhoe.
23
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Troubleshooting (Continued)
Problem
Cause
Correction
Unable to push valve
spool in
Bent spool
Replace with new spool section.
Foreign particles
Clean system and valve.
Misalignment of control handle
linkage
Check linkage for binding condition.
Spring centered spools
do not return to neutral
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 overtighten
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 for CBH70,
CBH80 should be torqued to 14 ft/lbs for
5/16” nuts and 33 ft/lbs for 3/8”nuts.
Never force spool.
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. If supply and return lines are
reversed, pressure on low pressure / return
side of valve will cause problem.
Make sure hoses are connected correctly
at bulkhead connection on backhoe.
Broken return springs
Bent spool
Replace springs.
Replace with new spool section.
Clean system and valve.
Foreign particles
Misalignment of control handle
linkage
Check linkage for binding condition.
24
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6. Install new seals:
MODEL CBH 60 MONOBLOCK
VALVE REPAIR - DISASSEMBLY
A. Spring-Centered Bonnet Assembly Only:
Replacing Spools Seals:
Lightly oil new O-ring seal. Slide seal over valve
spool and insert weal in counter bore. Replace back-
up washer and seal retainer.
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.
B. Float Bonnet Assembly Only:
1. Remove control valve from the backhoe.
Lightly oil new O-rings. Install O-rings into spacer.
Slide spacer with O-rings over valve spool being
careful to orient as shown in boom valve section
breakdown.
2. Throughly clean the exterior of the valve before
beginning disassembly procedures.
3. At the BACK of the valve remove all bonnet
assembly parts which are connected to the spool.
Keep parts in the order of disassembly. See each
valve section parts breakdown for the parts involved
in the make-up of the bennet assembly.
7. At the BACK of the valve replace bonnet assem-
bly parts, reversing the order in which they were dis-
assembled in step 3. Use 6 - 8 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 drive through the clevis slot,
or by running a rod through the pin hole and
using the rod as a handle.
8. At the FRONT of the valve remove all parts con-
nected to the spool (handle, linkage, etc.).
9. At the FRONT of the valve remove seal plate
retainer, back-up washer and spool O-ring seal.
10. Throughly clean counter bore.
DO NOT hold the spool with a wrench. This will
destroy the finish.
11. Lightly oil new O-ring seal. Slide O-ring seal over
valve spool and insert in seal counter bore. Replace
back-up washer and seal plate retainer.
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 O-ring.
12. Reattach all parts connected to the spool (han-
dle, linkage, etc.)
5. Throughly clean counter bores.
Figure 11
MODEL CBH 60
MONOBLOCK VALVE
Back Up Washer
“O”- Ring
Seal Plate
FRONT
Bonnet
Assembly
Float
Bonnet
Assembly
25
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of the end sections on a flat surface. To obtain prop-
er alignment of end sections relative to the spool sec-
tions apply downward pressure to the end sections;
snug tie rod nuts to about 10 ft. lbs.
MODEL CBH 70, CBH 80
VALVE REPAIR - DISASSEMBLY
Replace Center Section Assemblies:
Finally torque the two 1/2” nuts to 14 ft. lbs.; finally
torque the 9/16” nut to 33 ft. lbs. Check for proper
spool movement.
Note: For the purpose of these instructions we will
consider the section containing the INLET PORT as
the left side of the valve.
12. As required, install auxiliary valves and plugs and
torque to proper specifications.
NOTE: If it is decided that an overhaul of compo-
nents or pressure adjustments are necessary to cor-
rect malfunctioning, it is recommended that your
dealer make these repairs. He is equipped to do this
work.
Replacing Spools Seals:
Note: For the purpose of these instructions we will
consider the control handle side of the valve as the
FRONT, and the opposite side as the BACK.
1. Remove control valve from the backhoe.
1. Remove control valve from the backhoe.
2. Thoroughly clean the exterior of the valve before
beginning disassembly procedures.
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.
3. At the BACK of the valve remove all bonnet
assembly parts whick are connected to the spool.
Keep parts in the order of disassembly. See each
valve section parts breakdown for the parts involved
in the make-up of the bonnet assembly.
4. Mount the valve vertically in a vise to facilitate dis-
assembly and assembly.
IMPORTANT: DO NOT remove the spool from the
valve. The seals can be replaced externally.
Prevent spools from turning or moving by insert-
ing a screw driver through the clevis slot, or by
running a rod through the pin hole and using the
rod as a handle.
5. Remove the three tie rod nuts from the right end
section, using a thin-wall socket. Tools required for
basic valve disassembly and reassembly include
1/2” and 9/16” open or box end wrenches and a
torque wrench with thin wall sockets.
6. Valve sections can now be removed by sliding the
sections along the tie rods.
DO NOT hold the spool with a wrench. This will
destroy the finish.
7. Lay out valve components on a clean, flat working
surface. The inlet assembly will include an O-ring,
and the spool section(s) include an O-ring, a load
check poppet and a load check spring.
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 O-ring.
5. Thoroughly clean counter bores.
6. Install new seals:
8. Assemble tie rod nuts to one end of each tie rod
with one or two threads showing. Insert tie rods
through tie rod holes of inlet (larger tie rod at top).
Lay inlet on end with tie rods up, place O-ring into
position.
A. Spring-Centered Bonnet Assembly Only:
Lightly oil new O-ring seal. Slide O-ring over valve
spool and insert in seal counter bore. Replace back-
up washer and seal retainer.
9. Place first spool section (O-ring side up) on inlet
section, position O-ring and insert load check poppet
(nose down) and spring (behind poppet) into loader
check cavity. Repeat this procedure for each spool
section; the load check springs are compressed by
the following sections during assembly.
B. Float Bonnet Assembly Only:
Lightly oil new O-rings. Install O-rings into spacer.
Slide spacer with O-rings over spool being careful to
orient as shown in boom valve section breakdown.
10. Position end section on last spool section and
hand tighten tie rod nuts. The end section does not
have O-ring grooves.
7. At the BACK of the valve replace bonnet assembly
parts, reversing the order in which they were disas-
sembled in step 3. Use 6 - 8 ft. lbs torque to tighten
assembly screw on spring centered bonnet assem-
11. Position valve assembly with the mounting pads
26
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11. Lightly oil new O-ring seal. Slide O-ring seal over
valve spool and insert in seal counter bore. Replace
back-up washer, and seal plate retainer.
8. At the FRONT of the valve remove all parts con-
nected to the spool (handle, linkage, etc.).
9. At the FRONT of the valve remove seal plate
retainer, back-up washer and spool O-ring seal.
12. Reattach all parts connected to the spool (han-
dle, linkage, etc.).
10. Thoroughly clean counter bore.
MODEL CBH 70, CBH 80 VALVE
Tie Rod Nuts
Figure 12
Mounting Pads
“O”- Ring
End
Section
Mounting
Pads
Inlet
Port
Bonnet
Float
Bonnet
Tie
Rods
27
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Figure 13
DIPPERSTICK
GUIDE LINK
BOOM
BUCKET
BUCKET LINK
STABILIZER
CYLINDER
STABILIZER
MAINFRAME
LEG
ASSEMBLY - CBH 60, CBH 70, CBH 80
Model CBH 60
3. Remove plastic bag containing bucket pins from
backhoe. Attach bucket to dipperstick using one pin,
bolt, lock nuts, and shims as needed to take up gap
between dipperstick and bucket.
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 com-
plete, 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.
Model CBH 70
3. Remove plastic bag containing bucket pins from
backhoe. Attach bucket to dipperstick using one
pivot pin, two 5/16 NF x 7/8” bolts, lock nuts, pin
retainers and washers as needed to take up gap
under pin retainers. Place shims between dipper-
stick and bucket as needed to take up gap.
IMPORTANT: Tighten all hardware to torque
requirements specified in torque chart.
Model CBH 80
3. Remove plastic bag containing bucket pins from
backhoe. Attach bucket to dipperstick using one pin,
two bolts, nuts, lockwashers, pin retainers and
washers as needed to take up gap under pin retain-
ers. Place shims between dipperstick and bucket as
needed to take up gap.
1, Remove the stabilizer assemblies and any mis-
cellaneous items which have been fastened to the
skid and arrange conveniently.
Reposition stabilizer cylinders from their shipping
configuration by assembling them into the main-
frame, using pins and hardware provided. Be sure
cylinder ports are pointed upward and hoses are
routed above the cylinder to mainframe pivot pin
connection.
4.Attach bucket link to bucket, using same hardware
as listed from step #3.
5. Reposition hoist to backhoe to prevent tipping.
Remove all remaining strapping and attach stabiliz-
ers to mainframe using pins and hardware assem-
bled to backhoe.
!
CAUTION
DO NOT cut any strapping that fastens the
backhoe mainframe and swing frame to the
skid base at this time.
6. Attach stabilizer cylinders to stabilizers using pins
and hardware assembled to stabilizers.
2. Support boom and dipperstick 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.
7. Using caution to prevent tipping, raise mainframe
with hoist to a height of approximately 13” and
remove skid. Block mainframe and swing frame
securely.
!
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.
8. Follow the Attaching Kit Assembly Instructions to
mount the backhoe to the tractor. Check the installa-
tion carefully and make sure that all members are
correctly installed and securely fastened.
28
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MOUNTING KITS AND OPTIONAL KITS ASSEMBLY
3-POINT HITCH LINKAGE FOR CBH 60 & CBH 70
3-Point Hitch Linkage
General Description
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.
Mounting and hydraulic kits do not include hoses to
connect the backhoe to the tractor hydraulic system.
Additional hydraulic components, hoses, and/or kits
will be required to complete the hook-up to the trac-
tor hydraulic system. Refer to the “Hydraulic Hook-
up” section for further information. PTO pump 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.
Mounting Backhoe to Tractor
The Bush Hog backhoe can be mounted to the
power source using four different attaching kits.
NOTE: If the 3-Point Kit is to be used with a PTO
Pump Kit, the Reservoir Tank and its fittings should
be installed before proceeding with the 3-Point Kit
installation - Model CBH 70 and CBH80 only.
1. To an agricultural tractor’s 3-point hitch linkage
using the 3-point hitch kit: The 3-point hitch kit is the
same regardless of tractor model and the instruc-
tions for attaching the kit to the backhoe are includ-
ed below. .
2 To an agricultural tractor using a subframe kit
specifically offered for the tractor model and back-
hoe being mounted: The subframe kit instructions
differ with each tractor/backhoe combination and
come included with the individual subframe kit.
4. To an agricultural tractor using a 4-point kit specif-
ically offered for the tractor model and backhoe
being mounted: The 4-point kit instructions differ
with each tractor/backhoe combination and come
included with the individual 4-point mount kit.
29
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4. Install Seat Assembly from base backhoe to
Seat Upper Weldment (23) using hardware pro-
vided with base backhoe, consisting of four
1/2NC x 1-3/4” Carriage Bolts, Lockwashers, and Nuts.
Model CBH60 Backhoe
ATTACHING KIT INSTRUCTIONS
3-POINT HITCH LINKAGE & HYDRAULIC HOOK-
UP TO TRACTOR HYDRAULIC SYSTEMS
5. Tighten and torque all hardware installed.
6. Back tractor close to the backhoe. Connect tractor
lower link arms to lower link mounts using two L-pins
(20), two Cotter Pins (17), and two Wire Form Cotter
Pins (18).
General Description
Mounting and hydraulics kits do not include hoses
which connect the backhoe control valve to the trac-
tor hydraulic system. Additional hydraulic compo-
nents, hoses, and / or kits will be required to complete
hook-up to the tractor hydraulic system. Refer to the
Hydraulic Hook-up section for further information.
NOTE: If tractor has a Category II hitch, install two
Bushings (30) in lower link arms.
7. Attach Upper Braces (27) to backhoe with 3/4NF x
7-1/2 Bolt (6), Lockwasher (14), Washers (16) and Nut
(11). Do not tighten hardware at this time.
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.
8. Install Bushing (19) or Bushing (31) in the hole of the
Upper Bar (26) that most closely matches the diameter
of the tractor upper link pin. No bushing is necessary
for Category II tractors.
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.
9. Secure Upper Bar (26) between Upper Braces (27)
using 3/4NF x 4” Bolt (5), Washers (16), Lockwasher
(14) and Nut (110. Use hoist to raise or lower back-
hoe slightly until a hole in the Upper Bar aligns with a
hole in the Upper Braces.
ASSEMBLY
10. Attach RH Lower Link Weldment (28) and LH Lower
Link Weldment (29) to backhoe mainframe using
3/4NF x 2-1/4” Bolt (4), Washers (16), Lockwasher
(14), and Nut (11).
IMPORTANT: Tighten all hardware to the torque
requirements specified in the torque chart.
11. Align RH and LH Link Weldment (28, 29) with a hole in
the Upper Bar/Brace assembly, as close to the tractor
as possible. Use 3/4NF x 5-1/2” Bolt (7), Washers (16),
Lockwasher (14), and Nut (11). You may need to
return to step 6 and readjust upward or downward the
bolt connection. You may also need to switch the Right
and Left Hand Link weldments on the backhoe to
obtain proper clearances with tractor components.
!
WARNING!
To prevent bodily injury, do not operate backhoe
unless Lower Link Weldments (28, 29) are proper-
ly installed and adjusted. Failure to do so may
result in backhoe being thrust upward, crushing
operator against cab or ROPS.
12. Remove backhoe from the tractor.
1. Use hoist to raise the backhoe mainframe so that
the boom pivot pin is approximately 12” off the
ground.
13. Install Connector Plate (32) to RH and LH Lower Link
Weldments (28, 29) using 1/2NF x 1-3/4” bolt (2),
Lockwasher (13), and Nut (9).
2. Attach Right Hand and Left Hand Lower Link
Mount Weldments (21, 22) and Seat Upper Link
Weldment (23) to backhoe Mainframe Weldment
using eight 5/8NF x 2” Bolts (3), Hardened
Washers (15) and Nuts (10). Do not tighten hard-
ware at this time.
14. Tighten all hardware at this time.Check your installation
very carefully to be sure all members are correctly
installed and securely fastened.
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.
3. Install Right and Left Hand Floor Pans (24, 25) to
Seat Upper link Weldment (23) using four 3/8NC
x1”CarriageBolts(1), Lockwashers(12), andNuts(8).
30
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Model CBH60 Backhoe
ATTACHING KIT INSTRUCTIONS
3-POINT HITCH LINKAGE
Figure 14
31
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MODEL CBH70 BACKHOE
4. Install Bushing (13) or Bushing (16) in the Upper
Bar (20) that most closely matches the diameter of
the tractor upper link pin. No bushing is necessary
for Category II tractors.
ATTACHING KIT INSTRUCTIONS
3-POINT HITCH LINKAGE & HYDRAULIC HOOK-UP
TO TRACTOR HYDRAULIC SYSTEMS.
General Description
5. Secure Upper Bar (20) between Upper Braces (21)
using 3/4 x 4-1/2” Bolt (3), Flat Washers (10),
Lockwasher (9) and Nut (7). Use hoist to raise or
lower backhoe slightly until a hole in the upper bar
aligns with a hole in the upper braces.
Mounting and hydraulics kits do not include hoses
which connect the backhoe control valve to the trac-
tor hydraulic system. Additional hydraulic compo-
nents, hoses and/or kits will be required to complete
the hook-up to the tractor hydraulic system. Refer to
the Hydraulic Hook-up section for further information.
Pumps and reservoir kits are available as options.
6. Attach RH Lower Link Weldment (17) and LH
Lower Link Weldment (18) to backhoe mainframe
using 3/4 x 2-1/4” Bolt (2), Flat Washer (10),
Lockwasher (9), and Nut (7).
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.
7. Align RH and LH Link Weldment (17, 18) with the
upper bar/brace assembly, as close to the tractor
as possible. Use 3/4 x 6” Bolt (4), Flat Washer (10),
Lockwasher (9), and Nut (7). You may need to
return to Step 6 and readjust upward or downward
the bolt connection.
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.
8. Remove backhoe from the tractor.
9. Install connector plate (19) to RH and LH Lower
Link Weldments (17, 18) using 1/2 x 1-3/4” Bolt (1),
Lockwasher (8) and Nut (6).
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.
10. Tighten all hardware at this time. Check your instal-
lation very carefully to be sure all members are cor-
rectly installed and securely fastened.
ASSEMBLY
IMPORTANT: Tighten all hardware to the require-
ments specified in the torque chart.
11. If using optional PTO Pump and Reservoir Kit pro-
ceed to that section prior to remounting the back-
hoe onto the tractor.
!
WARNING
12. 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.
To prevent bodily injury, do not operate backhoe
unless Lower Link Weldments (17, 18) are prop-
erly installed and adjusted. Failure to do so may
result in backhoe being thrust upward, crushing
operator against cab or ROPS.
1. Use hoist to raise the backhoe mainframe so that
the boom pivot pin is approximately 14” off the
ground.
2. Back tractor close to the backhoe. Connect
tractor lower link arms to lower link mounts using
two L-pins (14), two Cotter Pins (11), and two
Wire Form Cotter Pins (12).
NOTE: If tractor has a Category II hitch, install two
Bushings (15) in lower link arms.
3. Attach Upper Braces (21), to backhoe with 3/4 x
7-1/2” Bolt (50, Lockwasher (9), Flat Washers
(10) and Nut (7). Do not tighten hardware at this
time.
32
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MODEL CBH70 BACKHOE
ATTACHING KIT INSTRUCTIONS
3-POINT HITCH LINKAGE
Figure 15
33
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4. Install Bushing (13) or Bushing (16) in hole of
the Upper Bar (17) that most closely matches
the diameter of the tractor upper link pin. No
bushing is necessary for Category II tractors.
MODEL CBH80 BACKHOE
ATTACHING KIT INSTRUCTIONS
3-POINT HITCH LINKAGE & HYDRAULIC HOOK-
UP TO TRACTOR HYDRAULIC SYSTEMS
5. Secure Upper Bar (17) between Upper Braces
(18) using 3/4 x 4-1/2” Bolt (3), Flat Washers
(10), Lockwasher (9) and nut (7). Use hoist to
raise or lower backhoe slightly until a hole in the
upper bar aligns with a hole in the upper braces.
General Description
Mounting and hydraulic kits do not include hoses
which connect the backhoe control valve to the trac-
tor hydraulic system. Additional hydraulic compo-
nents, hoses and /or kits will be required to complete
the hook-up to the tractor hydraulic system. Refer to
the Hydraulic Hook-up section for further informa-
tion. Pumps and reservoir kits are available as
options.
6. Attach RH Lower Link Weldment (19) and LH
Lower Link Weldment (20) to backhoe main-
frame using 3/4 x 2-1/2” Bolt (2), Flat Washer
(10), Lockwasher (9), and Nut (7).
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.
7. Align RH and LH Link Weldment (19, 20) with a
hole in the upper bar/brace assembly, as close
to the tractor as possible. Use 3/4 x 6” Bolt (4),
Flat Washer (10), Lockwasher (9), and Nut (7).
You may need to return to Step 6 and readjust
upward or downward the bolt connection.
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.
8. Remove backhoe from the tractor.
9. Install connector plate (21) to RH and LH Lower
Link Weldments (19, 20) using 1/2 x 1-3/4” Bolt
(1), Lockwasher (8), and Nut (6).
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.
10. Tighten all hardware at this time. Check your
installation very carefully to be sure all members
are correctly installed and securely fastened.
ASSEMBLY
11. If using optional PTO Pump and reservoir Kit
proceed to that section prior to remounting the
backhoe onto the tractor.
IMPORTANT: Tighten all hardware to the require-
ments specified in the torque chart.
12. 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.
!
WARNING
To prevent bodily injury, do not operate backhoe
unless Lower Link Weldments (19, 20) are prop-
erly installed and adjusted. Failure to do so may
result in backhoe being thrust upward, crushing
operator against cab or ROPS.
1. Use hoist to raise the backhoe mainframe so
that the boom pivot pin is approximately 16” off
the ground.
2. Back tractor close to the backhoe. Connect trac-
tor lower link arms to lower link mounts using
two L-pins (14), two Cotter Pins (11), and two
Wire Form Cotter Pins (12).
NOTE: If tractor has a category II hitch, install two
Bushings (15) in lower link arms.
3. Attach Upper Braces (18), to backhoe with 3/4 x
7-1/2” Bolt (5), Lockwasher (9), Flat Washers
(10) and Nut (7). Do not tighten hardware at this time.
34
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MODEL CBH80 BACKHOE
ATTACHING KIT INSTRUCTIONS
3-POINT HITCH LINKAGE
Figure 16
35
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PTO PUMP & RESERVOIR KIT INSTALLATION
7. Reinstall Filter Element to the Filter Base.
General Description CBH70
4.5 GPM Pump
8. Assemble Pump Plate (26) to Pump (11) using
two 3/8” NF x 1-3/4” Bolts (1), Lockwashers (8), and
Nuts (4). Pump Plate may have to be readjusted
later when installed on tractor PTO Shaft. The Plate
may need to be turned 180 degrees to provide prop-
er engagement with tractor drawbar and have ade-
quate clearances.
The PTO Pump Kit consists of those parts required
to power the backhoe from the tractor’s PTO shaft. It
includes the PTO pump and adapter, reservoir, filtra-
tion system, hydraulic hoses, and fittings. In addi-
tion, it includes a pump plate which attaches to the
tractor’s drawbar and keeps the pump from turning
with the PTO shaft.
9. Slide PTO Adapter (19) onto pump shaft, allowing
1/8” clearance between Adapter (19) in place using
two Setscrews (9) and 5/16” NC Nuts (2).
NOTE: The speed of the backhoe operation increas-
es as PTO speed increases.
10. Assemble Suction Hose (12) to Pump (11) using
Reducer Fitting (15) and 90 Degree Barbed Fitting
(16) Secure Hose using Hose Clamp.
Assembly
IMPORTANT - When installing hoses and fittings
always use thread sealant in permanent connec-
tions. Do not use thread sealant in union ends of
adapters. Do not over tighten fittings - they can
split or expand, causing leakage.
11. Connect 36” Hydraulic Hose (21) to Inlet Line
steel oil line located under Left Hand Foot Pad area
of the backhoe mainframe. Complete connection to
Pump using 90 Adapter Union (14).
IMPORTANT - Have a suitable hoist available
before proceeding with loader setup.
IMPORTANT - If hoses are connected incorrectly,
serious damage to the backhoe valve will result.
1. Assemble Filler Tube (27) and Breather Cap with
Dipstick (28) to Reservoir Tank (20).
12. NOTE: Initial fill up of Reservoir Tank will require
4-1/2 gallons of fluid. Fill Reservoir with recommend-
ed fluid to correct level; refer to Service Section in
the Backhoe Manual.
2. Assemble Reservoir Tank (20) to backhoe main-
frame using 5/16” NF Locknuts (3).
13. Install the backhoe to the tractor at this time fol-
lowing the installation procedure in the Attaching
Section of the manual.
3. Preassembly of Filter Base and Element (22):
Remove Filter Element from base to ease installa-
tion. Assemble Pipe Nipple (5) to “Inlet” port on filter
base (22).
14. Slide complete Pump assembly onto the PTO
shaft of the tractor, making sure locking collar on
PTO Adapter has locked into position.
Assemble 90 Degree Adapter Union (13) to “Outlet”
port on filter base (22).
IMPORTANT - Make sure kinks DO NOT develop
in any of the lines. Suction hose can be short-
ened to prevent this problem.
4. Assemble Filter Base (22) to Reservoir Tank (20)
using 90 Degree Pipe Elbow (7) and 45 Degree Pipe
Elbow (6).
!
CAUTION
NOTE - Change Filter Element (29) every time oil is
changed.
DO NOT REMOVE HE TRACTOR PTO SHIELD!
15. Pump Plate (26) may be adjusted (turned front to
back or bottom to top) on Pump (11) 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.
5. Assemble Suction Hose (12) to straight Barbed
Fitting (17) using Hose Clamp (18). Connect assem-
bly to 90 Degree Adapter Union (13) installed earlier
on the Filter Base and Element (22).
6. Install 90 Degree Adapter Union (25) top upper
port on Reservoir Tank (20). Install 90 Degree
Adapter Union (24) to Return Line “Check Valve” in
upper steel oil line located under Left Hand Foot Pad
area of the backhoe mainframe. Complete return
line connection to Reservoir Tank using Steel Oil
Line (23).
An alternate position for the Pump Plate may have it
pointed upwards and retained by the Upper Bar of
the Three Point Mount Kit. Whatever position is
selected, it is important that the pump be restrained
from rotating. Refer to illustration.
36
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IMPORTANT - When installing the backhoe, do not let the Swing Cylinders interfere with the backhoe
pump, or have the hydraulic lines become entangled in any part of the backhoe or tractor. Make sure
both Pressure and Suction Lines are free from kinks or twists to reduce back pressure and excessive
heat build-up.
CBH 70
BACKHOE
MAINFRAME/ADAPTER
4.5 GPM Pump
Installation
Figure 17
37
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may need to be turned 180 degrees to provide prop-
er engagement with tractor drawbar and have ade-
quate clearances.
General Description CBH 80
6.1 GPM Pump
The PTO Pump Kit consists of those parts required
to power the backhoe from the tractor’s PTO shaft. It
includes the PTO pump and adapter, reservoir, filtra-
tion system, hydraulic hoses, and fittings. In addi-
tion, it includes a pump plate which attaches to the
tractor’s drawbar and keeps the pump from turning
the PTO shaft.
9. Slide PTO Adapter (19) onto pump shaft, allowing
1/8” clearance between Adapter and pump face.
Secure PTO Adapter (19) in place using two
Setscrews (9) and 5/16” NC Nuts (2).
10. Assemble Suction Hose (11) to Pump (22) using
Reducer Fitting (7), Reducer Fitting (14), and 90
Degree Barbed Fitting (16). Secure Hose using Hose
Clamp (18).
NOTE: The speed of the backhoe operation increas-
es as PTO speed increases.
11. Connect 36” Hydraulic Hose (21) to Inlet Line
steel oil line located under Left Hand Foot Pad area
of the backhoe mainframe. Complete connection to
Pump using Reducer Fitting (15) and 90 Adapter
Union (12).
Assembly
IMPORTANT - When installing hoses and fittings
always use thread sealant in permanent connec-
tions. Do not use thread sealant in union ends of
adapters. Do not over tighten fittings - they can
split or expand, causing leakage.
IMPORTANT - If hoses are connected incorrectly,
serious damage to the backhoe will result.
IMPORTANT - Have a suitable hoist available before
proceeding with loader setup.
12. NOTE: Initial fill up of the Reservoir Tank will
require 4-1/2 gallons of fluid. Fill Reservoir with rec-
ommended fluid to correct level; refer to Service
Section in the Backhoe Manual.
1. Assemble Filler Tube (28) and Breather Cap with
Dipstick (29) to Reservoir Tank (20).
13. Install the backhoe to the tractor at this time fol-
lowing the installation procedure in the Attaching
Section of the manual.
2. Assemble Reservoir (20) to backhoe mainframe
using 5/16” NF Locknuts (3).
3. Preassembly of filter Base and Element (23):
14. Slide complete Pump assembly onto the PTO
shaft of the tractor, making sure locking collar on the
PTO Adapter has locked into position.
Remove Filter Element from base to ease installa-
tion. Assemble Pipe Nipple (5) to “Inlet” port on filter
base (23).
IMPORTANT - Make sure kinks DO NOT develop
in any of the lines. Suction hose can be short-
ened to prevent this problem.
4. Assemble Filter Base (23) to Reservoir Tank (20)
using 90 Degree Pipe Elbow (6) and Pipe Nipple (5).
CAUTION
NOTE - Change Filter Element (30) every time oil is
changed.
DO NOT REMOVE THE TRACTOR PTO SHIELD!
15. Pump Plate (27) may be adjusted (turned front to
back or bottom to top) on Pump (22) 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.
5. Assemble Suction Hose (11) to straight Barbed
Fitting (17) using Hose Clamp (18). Connect assem-
bly to 90 Degree Adapter Union (13) installed earlier
on the Filter Base and Element (23).
6. Install 90 Degree Adapter Union (26) to upper port
on Reservoir Tank (20). Install 90 Degree Adapter
Union (25) to Return Line “Check Valve” in upper
steel oil line located under Left Hand Foot Pad area
of the backhoe mainframe. Complete return line con-
nection to Reservoir Tank using Steel Oil Line (24).
An alternate position for the Pump Plate may have it
pointed upwards and retained by the Upper Bar of
the Three Point Mount Kit. Whatever position is
selected, it is important that the pump be restrained
from rotating. Refer to illustration.
7. Reinstall Filter Element to the Filter Base.
8. Assemble Pump Plate (27) to Pump (22) using
two 1/2” NF x 1-3/4” Bolts (1), Lockwashers (8), and
Nuts (4). Pump Plate may have to be readjusted
later when installed on tractor PTO Shaft. The Plate
38
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IMPORTANT - When installing the backhoe, do not let the Swing Cylinders interfere with the backhoe
pump, or have the hydraulic lines become entangled in any part of the backhoe or tractor. Make sure
both Pressure and Suction Lines are free from kinks or twists to reduce back pressure and excessive
heat build-up.
CBH 80
BACKHOE
6.1 GPM Pump
MAINFRAME/ADAPTER
Installation
Figure 18
30
39
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port of the tractor remote couplers or directly to the
tractor valve. The return hose (B) should be con-
nected from the tank (return) port on the backhoe to
a port on the reservoir, as shown in Figure 19.
1. OPEN-CENTER SYSTEM WITH LOADER VALVE
OR OTHER ACCESSORY VALVE CONNECTED TO
THE TRACTOR HYDRAULIC SYSTEM
When a loader valve or other accessory valve must
be connected to the tractor hydraulic system in addi-
tion to the backhoe control valve, a Power Beyond
Kit is required. This kit converts the backhoe valve so
that pressurized hydraulic oil can be directed to
another open-center valve for a loader or other
accessory. This allows the backhoe valve and the
other valve to be connected to the tractor hydraulic
system simultaneously, without the inconvenience of
using a flow diverting valve.
IMPORTANT: Never connect the return hose to a
tractor remote coupler which can be pressur-
ized. Accidental pressurization can cause seri-
ous damage to backhoe valve.
4. OPEN-CENTER SYSTEM WITH RETURN OIL
REQUIRED FOR LUBRICATION - Figure 20
On some tractors, the return oil cannot be routed
directly to the reservoir because it is required for the
lubrication of other functions. Check this characteris-
tic with your dealer. The pressure hose (A) must be
connected from the pressure port on the backhoe to
the pressure port of the tractor’s remote couplers or
directly to the tractor valve. The return hose (B)
must be connected from the tank (return) port on the
backhoe to a surge relief valve as shown in Figure
20.
Since the Power Beyond Kit is used with open-cen-
ter tractor hydraulic systems, oil constantly flows
from the pump, through the backhoe valve and then
to the reservoir. See further in this manual for
instructions on proper assembly.
2. CLOSED CENTER SYSTEM:(CBH 60 & CBH70)
Because a closed -center system requires no flow of
oil through the backhoe control valve when the
levers are in a neutral position, the CBH 60 & CBH
70 backhoe must not be connected to a closed-cen-
ter tractor hydraulic system.
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.
Complete the hydraulic hook-up by connecting the
surge relief valve to the return port of tractor remote
couplers or directly to the tractor valve, and by con-
necting a hose from TANK port of the surge relief
valve to the tractor reservoir as shown in Figure 20.
The surge relief valve is used to protect the backhoe
valve from damage caused by accidental pressur-
ization or high back pressure build-up. If this hap-
pens, oil will be vented from the TANK port of the
surge relief valve to the tractor reservoir to prevent
loss of vented oil.
IMPORTANT: Do not connect a CBH 60 & CBH
70 backhoe control valve to a closed-center trac-
tor hydraulic system, or serious damage to
backhoe valve or tractor hydraulic system may
result.
3.OPEN-CENTER SYSTEM WITH RETURN OIL
NOT REQUIRED FOR LUBRICATION -Figure 19
The pressure hose (A) should be connected from
the pressure port on the backhoe to the pressure
Figure 20
To Tractor
Figure 19
Resevoir
To Return Port
Backhoe Control
of Oil Supply
Backhoe Control
Valve
CBH 70 & 80
Shown
To Tractor
Reservoir
Valve
CBH 70 & 80
Shown
B
B
Coupler
Couplers
A
A
Hoses Supplied
by Customer
To Pressure Port
of Oil Supply
Pressure
Pressure
To Pressure Port
of Oil Supply
Hoses Supplied
by Customer
40
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exceed 2800 PSI.
Hydraulic Hook-Up (CBH 80) For
Tractors With Closed-Center Hydraulic
Systems (Figure 21)
3. A closed-center plug in the backhoe control valve
to make it a non-circulating or a demand type sys-
tem.
There are two basic types of hydraulic systems,
open-center 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.
4. A low pressure surge valve in the return line to
keep the tractor back pressure surges from dam-
aging the backhoe control valve seals or tractor
system. A surplus flow line from the relief valve car-
ries only the excess surge oil directly back to the
tractor hydraulic reservoir so that it bypasses all
other functions.
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 of pres-
sure approximately 2000PSI or more is maintained
in the system. Pressure oil is available instantly to
go to work when any one of the operating valves is
opened.
Backhoe Operation
Fot 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 when utilizing a closed-Center hydraulic
system.
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.
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 maxi-
mum 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 is completely
destroyed and there is no delivery.
Hook-Up Requirements
The hook-up of the CBH 80 Backhoe to the closed-
center system requires more than connecting it to
the remote couplers. The required devices are:
Therefore, when working various backhoe functions
at or near maximum ability, a closed center system
will give the operator the impression that the back-
hoe is sluggish and somewhat unresponsive.
Learning to ease up slight at the first indication of
slow down will permit the backhoe to perform at con-
tinuing maximum speed and efficiency.
1. A flow restrictor in the pressure line to keep the
speed of the backhoe operation within safe and
acceptable limits.
2. The main relief valve in the backhoe control valve
must be replaced with plug, to allow tractor system
relief to control pressure. System pressure must not
Figure 21
To Tractor
Reservoir
Surge Relief
Valve
Replace Main Relief with
Closed-Center Plug.
Couplers
Hoses Supplied
by Customer
Replace Open-Center Plug
with Closed-Center Plug,
Shown.
41
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POWER BEYOND KITS
FOR TRACTORS WITH OPEN-CENTER HYDRAULIC SYSTEMS
General Description
FIRST PROCEDURE
A power beyond application is required to convert a
hydraulic valve so that pressurized oil can be direct-
ed to another “open center” valve. This allows the
backhoe valve and a loader valve, or other accesso-
ry, to be connected to the tractor hydraulic system
simultaneously, without the inconvenience of using a
flow diverting 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.
Since the power beyond application is only required
on “open center” hydraulic systems, oil will be con-
stantly flowing from the pump through the backhoe
and loader or other accessory valve, and then back
to the reservoir. “Open center” refers to this constant
flow through the open center of the valves.
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.
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 sec-
ond 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. In the first procedure,
the power beyond plug is included with the loader
valve when the valve is ordered. The second proce-
dure requires the power beyond kit for the backhoe
valve be ordered from Bush Hog as a separate item.
There have been several different valves used on
the Bush Hog loader in past years. The fittings
requires 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 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.
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.
1. Install the power beyond plug received with the
loader valve into valve cavity as shown in Figure 22
(Page 43). Make sure O-rings on sleeve ae posi-
tioned properly and are not pinched or damaged.
Tractor Preparation
2. Install a pressure line (supplied by customer)
between the tractor pressure “out” port and the pres-
sure inlet port of the loader valve.
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 sev-
eral times.
3. Install a pressure line (supplied by customer)
between the power beyond fitting of the loader valve
and the pressure inlet port on the backhoe connec-
tion as shown in Figure 22.
Note: The terms RIGHT and LEFT for all adapter
parts are determined from the position of the opera-
tor when seated in the operating position on the
backhoe.
4. Complete assembly of “return” hoses as shown in
Figure 22. Connect tee fitting to return outlet port on
the backhoe connector as shown. Connect return
hose from return outlet port of the loader valve to the
branch port of the tee fitting. Hoses and tee supplied
by customer. Connect a second return hose from the
tee fitting directly to a port on the tractor reservoir as
shown in Figure 22.
42
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BUSH HOG BACKHOE & BUSH HOG LOADER VALVE
Figure 22
NOTE: Large loader valve (Walvoil)
shown. Small loader valve porting
is different. Refer to loader opera-
tor’s manual for different valves.
Outlet
Inlet
Open
Center
Plug
Bush Hog Loader Valve
From Tractor
PressureOutlet Port
To Tractor
Reservoir Port
Power Beyond Plug
(Supplied With Valve)
Backhoe Connection (Located
on outside of mainframe side
plate at left rear of hoe)
Backhoe Valve
Return Line
Adapter Union
1/2” NPTM x -8- JIC Male
Pressure To
Backhoe Valve
IMPORTANT: Never connect the return hose to a
tractor remote coupler which can be pressurized.
Accidental pressurization can cause serious damage
to backhoe valve.
43
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The following instructions are to be used to connect
the backhoe valve in line with a loader valve that is
not a Bush Hog loader valve. When connecting the
Bush Hog backhoe valve to a valve other than one
obtained from Bush Hog, the input pressure line
from the tractor will be connected to the pressure
port on the backhoe first. In order to properly plumb
the system, the backhoe valve will require convert-
ing to a power beyond valve. The power beyond
pressure line from the backhoe valve will be con-
nected 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.
SECOND PROCEDURE
ASSEMBLY OF A BUSH HOG BACKHOE
TO A NON BUSH HOG LOADER VALVE -
OR - BUSH HOG BACKHOE TO LOADER
VALVE USING PTO PUMP KIT OPTION.
IMPORTANT:
• Improper hydraulic hook-up can cause seri-
ous damage to the backhoe control valve,
loader valve, tractor valve, and other hydraulic
components.
• The pressure supply line from the PTO pump
must be connected to the pressure inlet port
on the backhoe whether using a Bush Hog
loader valve or a non - Bush Hog loader valve.
Never connect the pressure supply line from the
PTO pump to the loader valve pressure inlet port
because excessive pressure will build up result-
ing in damage to the PTO pump.
Figure 23
Loader or
Accessary Valve
To Tractor Reservoir
Port or Backhoe
Return Filter Inlet
Backhoe
Control
Valve
Adapter
Union
Outlet
90°
Adapter
Union
Return from
Loader Valve
Pressure to
Backhoe Valve
45°
Adapter
Union
From Tractor Pressure
“Out” Port or Outlet Port
of PTO Pump.
Shut Off
Plug
Pressure to
Loader Valver
44
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Power Beyond – Model CBH60 - FIGURE 24
1. Remove the cover that encloses the backhoe valve within the control console.
2. Disconnect Return Hose from 90 degree Adapter Union located on right hand side of control valve.
3. Remove 90 degree Adapter Union from control valve.
4. Install 1/4" BSPP Pipe Plug internally into the port opening. Tighten. Reinstall 90 degree Adapter Union
into right hand side of control valve.
5. Reconnect Return Hose to 90 degree Adapter Union.
6. Remove Plug from front of valve (Right Hand side).
7. Install 90 degree Adapter Union into right hand side of control valve.
8. Connect hydraulic hose (supplied by customer) to 90 degree Adapter Union. The hydraulic hose should
have the same pressure rating as the original pressure hose to the loader or other accessory valve.
9. Connect the other end of the hydraulic hose to the pressure port of the loader or accessory valve using fit-
tings (supplied by customer) as required. Refer to Figure 24.
10. Complete assembly of the backhoe “pressure” and “return” hydraulic hoses and a tee fitting (all supplied by
customer) as shown.
11. Complete assembly of the loader or accessory valve “return” hydraulic hose (supplied by customer) to the
tee fitting as shown.
12. Reinstall the cover that encloses the backhoe valve within the control console
Figure 24
Loader or
Accessary Valve
To Tractor Reservoir
Port or Backhoe
Return Filter Inlet
Return
Line
1/4” BSPP
Pipe Plug
Backhoe
Control
Valve
Return from
Loader Valve
Pressure to
Backhoe Valve
From Tractor Pressure
“Out” Port or Outlet Port
of PTO Pump.
Pressure
Hose
90°
Adapter
Union
Pressure to
Loader Valver
45
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Power Beyond – Model CBH70 & CBH80 - FIGURE 25
1. Remove Plug from underside of Right Hand Valve End Cover.
2. Install “Shut Off” Plug into the port opening. Torque Plug to 32 ft-lbs.
3. Remove Plug from Upper port on front side of Right Hand Valve End Cover.
4. Install 90 degree Adapter Union into Right Hand End Cover.
5. Assemble 45 degree Adapter Union into 90 degree Adapter Union, directing it rearward.
6. Connect hydraulic hose (supplied by customer) to 45 degree Adapter Union. The hydraulic hose should
have the same pressure rating as the original pressure hose to the loader or other accessory valve.
9. Connect the other end of the hydraulic hose to the pressure port of the loader or accessory valve using fit-
tings (supplied by customer) as required. Refer to Figure 25.
10. Complete assembly of the backhoe “pressure” and “return” hydraulic hoses and a tee fitting (all supplied by
customer) as shown.
11. Complete assembly of the loader or accessory valve “return” hydraulic hose (supplied by customer) to the
tee fitting as shown.
Figure 25
Loader or
To Tractor Reservoir
Accessary Valve
Port or Backhoe
Return Filter Inlet
Backhoe
Control
Valve
Adapter
Union
Outlet
90°
Adapter
Union
Return from
Loader Valve
Pressure to
Backhoe Valve
45°
Adapter
Union
From Tractor Pressure
“Out” Port or Outlet Port
of PTO Pump.
Shut Off
Plug
Pressure to
Loader Valver
46
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MECHANICAL THUMB INSTRUCTIONS - FIGURE 26
Thumb Operation
The Mechanical Thumb is used for picking up objects and securing them between the thumb and the bucket.
Large objects which can include rocks and logs when grasped, will increase momentum of backhoe as it is
swung side to side. Do not make sudden start and stops. Be careful lifting and moving long items such as tree
limbs, which will extend beyond the normal backhoe swing arc area.
Improper usage will damage backhoe and/or thumb.
When thumb is not in use it should be placed in the “storage” position. Remove Hitch Pin and slide column
assembly to its “shortest” position. Secure using Hitch Pin and Hair Pin Clip. The two remaining holes in the
column assembly can be selected when using the thumb assembly.
Do not use Mechanical Thumb:
• As a pry bar to loosen objects.
• To push or pull material or objects.
• To move objects from side to side.
• As an area to wrap a chain or rope for lifting purposes.
Installing Thumb to Backhoe
IMPORTANT – Improper hook-up can cause serious damage to backhoe components.
1. Park tractor with loader and backhoe on a level surface.
2. Set Parking Brake. Exit tractor.
3. Remove Boom Lock Pin from backhoe and place in storage location. Enter backhoe.
4. Lower Boom to place backhoe bucket on the ground. Rotate bucket such that the bucket side cutting edges
are parallel to the ground.
5. Exit backhoe and turn off the tractor ignition.
6. Remove hardware and pivot pin which secures Bucket to Dipperstick. Discard pivot pin and retain hardware
for use in a later step.
7. Assemble Mechanical Thumb (8) over Bucket and secure to backhoe using Pivot Pin (9), Shims (5) as
required, and hardware removed earlier.
8. Attach Upper Column Weldment (10) to underside of Dipperstick Weldment using Bolt (2), Flat Washers (4),
and Nut (3). Do not over tighten hardware. Upper Column must pivot freely under Dipperstick.
9. Install Lower Column Weldment (11) into Upper Column Weldment (10). Secure Upper Column into lowest
of the three holes of the Lower Column using Hitch Pin (7) and Hair Pin Clip (6).
10. Connect Column assembly to Mechanical Thumb (8) using Bolt (1), Flat Washers (4), and Lock Nut (3). Do
not over tighten hardware. Column assembly must pivot freely in Mechanical Thumb
47
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FIGURE 26
4
2
3
4
7
6
10
11
8
4
1
4
3
5
9
MECHANICAL THUMB
ASSEMBLED
48
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REPOSITION STABILIZER CYLINDERS BEFORE
REMOVING BACKHOE FROM SHIPPING PALLET
Cylinder ports must be pointing upward and hoses routed above the cylinder to main-
frame pivot pin connection.
Backhoe is shipped palletized from factory. Remove stabilizers and fasteners from pallet. Position stabilizer
between mounting lugs and pin into place. Cut plastic ties from rod ends of hydraulic cylinders, swing down
and pull rod end out to align with stabilizer mounting lugs. Pin into place with provided fasteners.
Pinning Stabilizer
Into Place
Hydraulic Cylinder Rod
Stabilizer
49
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BACKHOES - DIMENSIONS AND SPECIFICATIONS
CBH60
6-1/4 Foot
76”
CBH70
7-1/4 Foot
87.5”
CBH80
8-1/4 Foot
99.5”
SERIES
Maximum Digging Depth
A. Digging Depth (two foot flat bottom)
B. Swing Arc
74.5”
86.5”
98.5”
150°
180°
180°
C. Loading Height (bucket at 60°)
D. Reach from Center Line of Swing Pivot
E. Transport Height (maximum)
F. Bucket Rotation
60”
73.5”
82”
104”
120”
136”
66”
82”
90”
180°
180°
180°
G. Loading Reach (bucket at 60°)
H. Transport Overhang
33”
40”
41”
37”
48.5”
54.5”
I. Undercut
17”
14”
17.5’
J. Stabilizer Spread, up position
K. Stabilizer Spread, down position
Bucket Cylinder Digging Force
Dipperstick Cylinder Digging Force`
Hydraulic Volume Requirements
Hydraulic Pressure Requirements
Recommended Tractor HP Requirements
Shipping Weight (less bucket & pallet)
58”
61”
54”
74”
89”
99”
2473 lbs.
1363 lbs.
3 to 4 GPM
2000 psi.
15 - 25 HP
604 lbs.
3540 lbs.
2173 lbs.
4 to 5 GPM
2250 psi.
45 HP
920 lbs.
3860 lbs.
2505 lbs.
6 to 8 GPM
2550 psi.
45 - 95 HP
1180 lbs.
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.
50
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TORQUE SPECIFICATIONS
Proper toque for American fasteners used on Bush Hog equipment.
Recommended Torque in Foot Pounds (Newton Meters).*
AMERICAN
BOLT DIAMETER
Bolt Head Markings
WRENCH
(IN.) “B” AND
THREAD SIZE
SAE
SAE
SAE
SIZE (IN.) “A”
GRADE 2
GRADE 5
GRADE 8
7/16
7/16
1/4 - 2O UNC
1/4 - 28 UNF
5/16 - 18 UNC
5/16 - 24 UNF
3/8 - 16 UNC
3/8 - 24 UNF
7/16 - 14 UNC
7/16 - 20 UNF
1/2 - 13 UNC
1/2 - 20 UNF
9/16 - 12 UNC
9/16 - 18 UNF
5/8 - 11 UNC
5/8 - 18 UNF
3/4 - 10 UNC
3/4 - 16 UNF
7/8 - 9 UNC
6 (7)
8 (11)
10 (13)
12 (16)
14 (18)
6 (8)
1/2
11 (15)
17 (23)
25 (33)
1/2
13 (17)
19 (26)
27 (37)
SAE Grade 2
(No Dashes)
9/16
20 (27)
31 (42)
44 (60)
9/16
23 (31)
35 (47)
49 (66)
5/8
32 (43)
49 (66)
70 (95)
5/8
36 (49)
55 (75)
78 (106)
3/4
49 (66)
76 (103)
106 (144)
120 (163)
153 (207)
172 (233)
212 (287)
240 (325)
376 (509)
420 (569)
606 (821)
668 (905)
909 (1232)
995 (1348)
1019 (1381)
1288(1745)
1444 (1957)
1817 (2462)
2013 (2728)
2382 (3228)
2712 (3675)
3161 (4283)
3557 (4820)
3/4
55 (75)
85 (115)
7/8
70 (95)
109 (148)
122 (165)
150 (203)
170 (230)
266 (360)
297 (402)
430 (583)
474 (642)
644 (873)
705 (955)
721 (977)
795 (1077)
890 (1206)
1120 (1518)
1241 (1682)
1470 (1992)
1672 (2266)
1950 (2642)
2194 (2973)
7/8
79 (107)
97 (131)
110 (149)
144 (195)
192 (260)
166 (225)
184 (249)
250 (339)
274 (371)
280 (379)
354 (480)
397 (538)
500 (678)
553 (749)
655 (887)
746 (1011)
870 (1179)
979 (1327)
15/16
15/16
1-1/8
1-1/8
1-5/16
1-5/16
1-1/2
1-1/2
1-1/2
1-11/16
1-11/16
1-7/8
1-7/8
2-1/16
2-1/16
2-1/4
2-1/4
SAE Grade 5
(3 Dashes)
7/8 - 14 UNF
1 - 8 UNC
1 - 12 UNF
1 - 14 UNF
1-1/8 - 7 UNC
1-1/8 - 12 UNF
1-1/4 - 7 UNC
1-1/4 - 12 UNF
1-3/8 - 6 UNC
1-3/8 - 12 UNF
1-1/2 - 6 UNC
1-1/2 - 12 UNF
Wrench
Size “A”
SAE Grade 8
(6 Dashes)
Proper torque for metric fasteners used on Bush Hog equipment.
Recommended torque in foot pounds (Newton Meters).*
METRIC
—WRENCH
BOLT
SIZE
DIA.
ASTM
4.6
ASTM
8.8
ASTM
9.8
ASTM
10.9
(mm) “A”
(mm) “B”
8
5
1.8 (2.4)
3 (4)
5.1 (6.9)
8.7 (12)
21.1 (29)
42 (57)
73 (99)
116 (157)
181 (245)
6.5 (8.8)
11.1 (15)
27 (37)
10
13
16
18
21
24
30
33
36
41
46
6
Wrench
Size “A”
8
7.3 (10)
14.5 (20)
25 (34)
40 (54)
62 (84)
122 (165)
8.8
10
12
14
16
20
22
24
27
30
53 (72)
74 (100)
118 (160)
167 (226)
325 (440)
443 (600)
563 (763)
821 (1112)
1119 (1516)
93 (126)
148 (201)
230 (312)
449 (608)
611 (828)
778 (1054)
1138 (1542)
1547 (2096)
Numbers appearing on bolt heads
indicate ASTM class.
*Use 75% of the specified torque value for plated
fasteners. Use 85% of the specified torque values
for lubricated fasteners.
211 (286)
418 (566)
51
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Download from Www.Somanuals.com. All Manuals Search And Download.
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2501 Griffin Ave. Selma, AL 36703
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Download from Www.Somanuals.com. All Manuals Search And Download.
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