BUSH HOG BH750 (01) PDF Document

As the Retail Customer and/or Operator of a BUSH HOG BH750, your responsibilities under the Bush Hog Warranty are as follows:

1. To read the Operator’s Manual, and to operate, lubricate, maintain, and store the product in accordance with all instructions and safety procedures. Failure to read the Operator’s Manual is considered a misuse of the equipment.

2. 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 create a safety hazard.

3. To deliver the product to the authorized Bush Hog dealer from whom it was purchased for service or replacement of defective parts covered by warranty. Repairs must be submitted for warranty consideration within forty-five (45) days of failure.

4. To cover any cost incurred by the Dealer for traveling to or hauling of the product for the purpose of performing a warranty obligation or inspection.

When using the BUSH HOG BH750, follow these safety precautions for the tractor:

1. Read the tractor operator’s manual to learn how to operate your tractor safely. Failure to do so could result in serious injury or death and equipment damage.

2. It is recommended that the tractor be equipped with a Rollover Protective System (ROPS) and that 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 a tractor with a wide front axle rather than tricycle front wheels.

6. Move and turn the tractor at low speeds.

7. Before dismounting, servicing, or repairing, stop the tractor engine, place the transmission in park (or neutral), engage the parking brake, lower loader arms to the ground, cycle all hydraulic controls to relieve pressure, allow all moving parts to stop, and remove the ignition key.

8. Wear personal protective equipment (PPE) such as protection for eyes, ears, lungs, head, hands, and feet. Avoid wearing loose clothing or jewelry that may get caught in moving parts.

To ensure safe operation of the BUSH HOG BH750 backhoe, adhere to the following precautions:

1. DO NOT operate the backhoe unless it is rigidly attached to the tractor or skid steer loader.

2. KNOW your controls. Read the operator’s manuals for both the BUSH HOG BH750 and your tractor. Learn how to stop the equipment 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’s front axle.

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 the operator’s platform 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 before attempting to operate the backhoe.

11. NEVER dig with the backhoe unless the stabilizers are properly set.

12. DO NOT dig under stabilizers or the tractor. Soft ground can cause cave-ins.

13. KEEP BUCKET away from the stabilizer area to avoid damage.

14. ALWAYS swing the bucket uphill to dump when on a hillside and keep the loaded bucket low.

15. SET BRAKES and block wheels when operating on hills 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 it only for digging.

20. ALWAYS lower the backhoe bucket and stabilizers to the ground, shut off the engine, and apply the parking brake before getting off the 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 it using the backhoe dipperstick or bucket.

For safe transportation of the BUSH HOG BH750, follow these rules:

1. ALWAYS engage safety locks before transporting the backhoe.

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 (Slow Moving Vehicle) emblem is visible to the rear.

5. TRAVEL SLOWLY over rough terrain, on hillsides, and around curves to prevent tipping.

ESCAPING fluid under pressure can have sufficient force to penetrate the skin and cause serious injury. Follow these precautions:

1. Be sure to stop the engine and relieve all pressure before disconnecting lines.

2. Be sure all connections are tight and that lines, pipes, and hoses are not damaged before applying pressure to the system.

3. 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.

4. SEE A DOCTOR at once if injured by escaping fluid. Serious infection or gangrene can develop if proper medical treatment is not administered immediately.

The BUSH HOG BH750 has two major control levers and stabilizer control levers on the console ahead of the operator. In general, the direction of movement of a control lever corresponds to the movement of the operating member.

1. Left Hand Stabilizer:

Push lever forward: The LH stabilizer lowers.

Pull lever back: The LH stabilizer raises.

2. Boom/Swing Lever:

Push lever forward: The boom moves down, away from the operator.

Pull lever back: The boom moves up, toward the operator.

Move lever to the left: The backhoe swings to the left.

Move lever to the right: The backhoe swings to the right.

Float Function: The Boom/Swing lever has a “float” function. Pushing the lever forward past the detent stop will cause the boom to float, moving freely up or down. When released, the lever should return to neutral. DO NOT lower the backhoe boom using the “float” function as it will freefall.

Combined Movements: You can move the lever to intermediate positions to perform two operations simultaneously. For example, moving the lever forward and to the left will SWING LEFT AND LOWER the boom.

3. Crowd/Bucket Lever:

Push lever forward: The dipperstick moves out, away from the operator.

Pull lever back: The dipperstick moves in, toward the operator.

Move lever to left: The bucket curls in.

Move lever to right: The bucket extends out.

Combined Movements: Similar to the boom/swing lever, you can use intermediate positions for simultaneous operations, such as EXTEND AND LOAD the bucket by moving the lever forward and to the left.

4. Right Hand Stabilizer:

Push lever forward: The RH stabilizer lowers.

Pull lever back: The RH stabilizer raises.

To avoid possible injury when operating the BUSH HOG BH750, observe the following safety rules:

1. DISENGAGE safety lock pins before attempting to operate the backhoe. Store the lock pins in the angled tubes located on the rear right-hand side of the backhoe, below the foot platform.

2. OPERATE from the backhoe operator’s seat only.

3. LOWER the stabilizers until the rear of the tractor is totally supported by them. The rear tires should not come up off the ground.

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 using the backhoe dipperstick or bucket.

7. DO NOT lose stability by swinging the bucket downhill when positioned on a slope.

8. DO NOT lower the backhoe boom using the “float” function. It will freefall and could result in injury or damage.

To prevent serious damage to the tractor, follow these instructions for transporting the BUSH HOG BH750:

1. Before leaving the operator’s seat, position the backhoe for transport by raising the boom, crowding the dipperstick in, swinging to the center, and raising the stabilizers.

2. ALWAYS engage both safety locks when transporting the backhoe.

3. TRAVEL SLOWLY over rough terrain.

4. When transporting on a truck or trailer, LOWER THE BACKHOE BOOM so the bucket rests firmly on the bed. Apply restraints to the TRACTOR, NOT to the backhoe or backhoe attaching kit.

5. For long-distance transport, periodically examine the backhoe and raise the stabilizers and bucket back to full transport height, as it is normal for them to slowly settle.

IMPORTANT: DO NOT chain the backhoe down to secure the tractor to a trailer. Block and secure the tractor only.

To properly position the stabilizers on your BUSH HOG BH750, set them to remove weight from the rear wheels. The wheels should remain touching the ground. This provides the widest stabilizer stance and the lowest center of gravity. Raising the wheels off the ground will reduce stability and digging depth, impair performance, and impose unnecessary stress on the unit.

FILLING THE BUCKET

Control the bucket attitude throughout the digging cycle to keep the teeth at the proper angle for the best penetration. When digging in hard-packed soil, you can increase penetration by applying down pressure with the boom while crowding in and curling the bucket.

DUMPING THE BUCKET

To dump the bucket, lift it clear of the trench while crowding it out and swinging it to the spoil pile. As the pile is approached, dump the bucket. When empty, the dipperstick and bucket are in position to resume digging.

IMPORTANT: Avoid constant jarring or hammering-type contact between the spoil pile and the loaded bucket to prevent premature wear to pins and bushings.

TRENCHING BETWEEN A BUILDING AND OPEN EXCAVATIONS

1. Start the trench at the building and dig halfway to the excavation.

2. Start trenching from the excavation toward the first trench until there is just enough room to move the unit out.

3. Position the unit so the backhoe swing post is over the centerline of the trench connection. Dig at extreme swing positions and as close to the stabilizers as possible, piling the spoil on the opposite side.

4. Position the unit forward with the lift and crowd levers to connect the two trenches.

SIDE SLOPE EXCAVATING OR TRENCHING

Dig with the backhoe uphill whenever possible. Level the backhoe on slopes with the stabilizers to dig plumb trenches. Pile the spoil from the slot on the low side. When on a steep slope, cut a level surface along the uphill side of the trench with the loader and pile the spoil of the cut downhill. When digging, pile the spoil of the trench uphill.

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. To finish the near wall, lift up and crowd in, keeping the edges of the bucket horizontal.

BACKFILLING

Backfill by lifting the bucket over the spoil pile and then crowding in. Pull both the crowd and lift levers for smooth, even backfilling.

IMPORTANT: Do not backfill by using the swing circuit and dragging the bucket sideways. Doing so can cause damage to the dipperstick, boom, swing cylinders, and/or the mainframe.

At the beginning of each season, perform the following maintenance on your BUSH HOG BH750:

1. Remove all protective coverings.

2. Check hydraulic hoses for deterioration and replace if necessary.

3. Lubricate all grease fittings and oil handle linkages.

4. Check the hydraulic system for loss of fluid and, if necessary, fill to the proper level.

5. Tighten all loose bolts, nuts, and setscrews.

6. Inspect bucket teeth and, if necessary, sharpen or replace them.

7. Operate the backhoe slowly for a short time before placing the unit under a 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 the tractor engine and operate the backhoe through all movements fully several times to purge the system of air.

Hydraulic System Hoses

Oil leaks in the pressure side can be located by inspecting the external area of hoses and fittings. For the return side, check for leaks by examining the oil in the reservoir; if air is being drawn in, the oil will contain air bubbles and appear to foam.

When tightening connections, always use two wrenches. Do not over-tighten fittings; make them just tight enough to eliminate leaks. NEVER use teflon tape on pipe thread fittings; always use a paste-type sealer.

Examine hoses regularly and replace any that show signs of failure. Pay careful attention to hose routing to ensure they can move freely without kinking and cannot be pinched or cut.

For BUSH HOG BH750 models with PTO pump systems, follow these steps to service the hydraulic reservoir:

1. Check Oil Level: Maintain the oil at the proper level using the dipstick/breather cap located behind the right side of the foot platform. To check, the backhoe should be extended to full reach with the bucket rolled back and resting on the ground. All cylinders should be retracted except for the boom cylinder. Do not overfill.

2. Fluid Type:

Northern climates: Use SAE 10W40 engine oil with API “SF/SG” classification.

Southern climates: Use SAE 40W engine oil with API “SF/SG” classification.

3. Change Oil: Change the oil every 200 hours or more often if necessary.

To change the oil, extend the backhoe to full reach with the bucket rolled back and resting on the ground.

Turn off the tractor PTO and shut down the tractor engine.

Unseat the breather cap and remove the drain plug from the left rear underside of the reservoir using a 1/4″ hex wrench.

Drain the oil and replace the drain plug.

Refill the reservoir with 7 gallons of fresh oil according to the guidelines above.

Reseat the breather cap, start the engine and PTO, and cycle all backhoe functions several times to remove air.

Re-check the oil level with the backhoe in the same extended position. If the level is below the “ADD” line, add enough oil to bring it up to the “FULL” line. DO NOT overfill.

TOOTH REPLACEMENT

Bolt-On Tooth: When worn, replace by removing the hardware that connects it to the cutting edge. Install the new tooth and replace hardware if necessary.

Roll-Pinned Tooth: When worn, replace by driving out the roll pin with a hammer and punch. Install the new tooth using a new roll pin and a hammer.

TIGHTENING NUTS AND BOLTS

Periodically check to be sure all bolts and nuts are tight. Also, check all pivot pins for cotter pins, washers, and retainers; if missing, replace.

LUBRICATION

IMPORTANT: Avoid excessive greasing, as dirt collects on exposed grease and increases wear. After greasing, wipe off excessive grease from fittings.

Lubricate all parts with grease fittings using a good quality chassis lube type grease. Clean all fittings before using a grease gun and replace any missing fittings immediately.

Lubricate all grease fittings at least twice daily: once at the beginning of operation and again approximately halfway through the workday.

To access all fittings, lower the stabilizers to the ground and lower the boom so the bucket rests on the ground.

IMPORTANT: Before greasing the boom to swing frame pivot, raise the boom and install the transport lock pin.

The following locations should be oiled with SAE30 oil:

A. All Control Handle Linkages

B. Seat Bracket Pivot

The BUSH HOG BH750 is self-assisting during removal. Follow these steps:

1. Install the swing safety lock pin.

2. Stretch out the boom, dipper stick, and bucket. Lower the bucket to the ground so that it rests solidly.

3. Raise the backhoe operator’s seat to the raised position.

4. Place suitable blocking under the backhoe frame to support it adequately.

5. Detach the backhoe from the tractor mechanically only, not hydraulically at this point. The backhoe can still be moved hydraulically to release connection points. Move the tractor a few inches away.

6. Gently lower the backhoe onto the blocking. Leave the stabilizers outstretched and firmly in contact with the ground for added stability.

7. The hydraulic system can now be disconnected. CAUTION: Make sure the tractor PTO is disengaged and the engine is shut off before disconnecting the pump or hydraulic lines.

a. For PTO pump systems, remove the pump from the PTO shaft. The hydraulic system should remain complete.

b. For systems that tap into tractor hydraulics, these lines can be disconnected. IMPORTANT: Mark the lines to prevent mix-up during reattachment and cap the ends to keep them clean.

8. Slowly drive the tractor forward and away from the backhoe, ensuring all parts clear each other.

9. For long-term storage, coat exposed lift, swing, and stabilizer cylinder rods with grease.

10. Lubricate all grease fittings and oil all handle linkages.

Use this table to troubleshoot operational problems with your BUSH HOG BH750.

If your BUSH HOG BH750 is experiencing power loss in specific cylinders, consult the following troubleshooting guide:

Replace Center Section Assemblies:

Note: The section containing the MAIN RELIEF VALVE is considered the left side.

1. Remove the control valve from the backhoe.

2. Thoroughly clean the exterior of the valve.

3. Mark each section numerically so they can be reassembled in the same order.

4. Mount the valve vertically in a vise.

5. Remove the 3 tie rod nuts from the right end section using a thin-wall socket.

6. Slide the valve sections off the tie rods.

7. Thoroughly clean the O-ring counterbores and ground surfaces of each section. It is recommended to replace all O-rings with new parts from a kit.

8. Replace the sections on the tie rods with the O-ring counterbores facing the right end of the valve. Be careful not to dislodge the O-rings.

9. When all sections are assembled, tighten the tie rod nuts equally to 30 ft. lbs. torque. NO MORE – NO LESS, or spools may bind.

Replacing Spool Seals:

Note: The control handle side is considered the TOP, and the opposite side is the BOTTOM.

Use the following tables for proper torque on American and Metric fasteners used on Bush Hog equipment. Note that for plated fasteners, use 75% of the specified torque value, and for lubricated fasteners, use 85% of the specified value.

AMERICAN – Recommended Torque in Foot Pounds (Newton Meters)

METRIC – Recommended torque in foot pounds (Newton Meters)