BUSH HOG BH850 (01) PDF Document

Before delivering the BUSH HOG BH850, the dealer should complete the following checklist:

1. Machine properly assembled.

2. All safety decals readable.

3. All bolts tightened to torque specifications given in the torque chart.

4. Machine operates properly.

5. Operator’s manual has been delivered to owner and he has been instructed on the safe and proper use of the backhoe.

It is recommended that the tractor be equipped with a Rollover Protection System (ROPS) and seat belt for all implement operations.

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 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. 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 machine moving parts to stop, and remove the ignition key to prevent unauthorized starting before dismounting, servicing, repairing, or making adjustments.

8. Wear personal protective equipment (PPE) such as protection for eyes, ears, lungs, head, hands, and feet. Avoid wearing loose clothing or jewelry.

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, engine, and 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’s front axle. If unsure of weight distribution, determine at a weight scale. Total vehicle weight, including the backhoe and counterweights, 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 the operator’s platform of the 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 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 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 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 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 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 the tractor forward or backward using the backhoe dipperstick or bucket.

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 emblem is visible to the rear.

Before leaving the backhoe operator’s seat, position the backhoe for transport by raising the boom, crowding the dipperstick in, swinging to the center, and raising the stabilizers. When transporting for long distances, periodically examine the backhoe and raise stabilizers and bucket back up to the full transport height. It is normal for the backhoe to slowly settle while being transported.

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. Do not chain the backhoe down to secure the tractor to the trailer.

ADJUSTMENTS AND INSPECTION

1. CHECK pins that attach the backhoe to the 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 the backhoe.

3. DO NOT oil, grease, or adjust the backhoe while it is in motion.

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 a workpiece or striking tool.

7. DO NOT remove any guards on the 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 the engine and relieve all pressure before disconnecting lines. Be sure all connections are tight and that lines, pipes, and hoses are not damaged before applying pressure to the system. Fluid escaping from a very small hole can be almost invisible. Use a piece of cardboard or wood, not your hands, to search for suspected leaks.

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

1. Securely fasten your seat belt if the tractor has a ROPS.

2. Where possible, avoid operating the tractor near ditches, embankments, and holes.

3. Reduce speed when turning, crossing slopes, and on rough, slick, or muddy surfaces.

4. Stay off slopes too steep for safe operation.

5. Watch where you are going, especially at row ends, on roads, and around trees.

6. Do not permit others to ride.

7. Operate the tractor smoothly – no jerky turns, starts, or stops.

8. Hitch only to the drawbar and hitch points recommended by tractor manufacturers.

9. When the tractor is stopped, set brakes securely and use the park lock if available.

The BUSH HOG BH850 has two major control levers plus the stabilizer control levers on the control console. The terms right, left, front, and back are determined from the operator’s seated position.

1. Left Hand Stabilizer: Push the lever forward to lower the LH stabilizer. Pull the lever back to raise the LH stabilizer.

2. Boom/Swing:

– Push the lever forward to move the boom down, away from the operator.

– Pull the lever back to move the boom up, toward the operator.

– This lever has a “float” function. Pushing the lever further forward past a detent will cause the boom to float freely. When released, it should return to neutral.

– Move the lever to the left to swing the backhoe left.

– Move the lever to the right to swing the backhoe right.

– Intermediate positions allow for simultaneous swing and boom movements (e.g., move forward and to the left to swing left and lower the boom).

3. Crowd/Bucket:

– Push the lever forward to move the dipperstick out, away from the operator.

– Pull the lever back to move the dipperstick in, toward the operator.

– Move the lever to the left to curl the bucket in.

– Move the lever to the right to extend the bucket out.

– Intermediate positions allow for simultaneous dipperstick and bucket movements (e.g., move back and to the left to retract and load the bucket).

4. Right Hand Stabilizer: Push the lever forward to lower the RH stabilizer. Pull the lever back to raise the RH stabilizer.

In general, the direction of movement of a control lever corresponds to the movement of the operating member.

To avoid possible injury, observe the following safety rules when operating the BUSH HOG BH850:

1. DISENGAGE safety lock pins before attempting to operate the backhoe. Store lock pins in the angled tubes located at 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. NOTE: Rear tires should not come up off of 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 forward or backward using the backhoe dipperstick or bucket.

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

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

Set the stabilizers on your BUSH HOG BH850 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 best penetration. This will minimize dragging and scraping. When digging in hard-packed soil, increase bucket penetration 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 to correct the bucket depth.

To obtain a cleaner trench and avoid material buildup, crowd out and completely curl the bucket while starting to lift it from the excavation. This allows excess material to fall back into the excavation.

DUMPING THE BUCKET

To dump the bucket at the end of the digging cycle, lift the bucket clear of the trench while crowding it out and swinging it to the spoil pile. 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.

TRENCHING BETWEEN A BUILDING AND OPEN EXCAVATIONS

Start the trench at the building and trench out halfway to the excavation. Then, start trenching from the excavation toward the first trench until there is just enough room to move the unit out between the two trenches. Position the unit so the backhoe swing post is over the centerline of the trench connection, digging at extreme swing positions. Pile the spoil on the opposite side. Finally, position the unit forward 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. 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.

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 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, or swing cylinders and/or the mainframe.

At the beginning of the season, perform the following maintenance on your BUSH HOG BH850:

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 full load.

If the hydraulic hoses have been disconnected from the BUSH HOG BH850 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.

For PTO pump systems, maintain the reservoir oil at the proper level by checking the dipstick, which is located behind the right side of the foot platform. To check the oil level, 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, as oil may be forced out of the breather cap.

Fill with:

– SAE 10W40 engine oil with API “SF/SG” classification in northern climates.

– SAE 40W engine oil with API “SF/SG” classification in southern climates.

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 engine. Unseat the breather cap and remove the drain plug from the left rear underside of the reservoir using a 1/4″ hex wrench. After draining, replace the drain plug and refill the reservoir with 7 gallons of fresh oil. Reseat the breather cap, start the engine and PTO, and cycle all backhoe functions several times to remove air. Recheck the oil level and add oil if it is below the “ADD” line, bringing it up to the “FULL” line. DO NOT overfill.

If the tractor system supplies hydraulic power, service it according to the tractor’s instruction manual.

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

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

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.

Proper lubrication is essential for the efficient operation of your BUSH HOG BH850. Avoid excessive greasing, as dirt collects on exposed grease and increases wear.

1. All parts with grease fittings should be lubricated with a good quality chassis lube type grease. Clean all fittings before using a grease gun.

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

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

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

5. The following locations should be oiled with SAE30 oil:

– All Control Handle Linkages

– Seat Bracket Pivot

The BUSH HOG BH850 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. Move the tractor a few inches away. The backhoe can still be moved hydraulically to release connection points.

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. Make sure the tractor PTO is disengaged and the engine is shut off before disconnecting the pump or hydraulic lines.

– On PTO pump systems, the pump should be removed from the PTO shaft. The hydraulic system should remain complete.

– On systems that tap into the tractor for hydraulic power, these lines can be disconnected. 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. Refer to the attaching kit installation instructions for help with removal and reattaching.

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

11. Lubricate all grease fittings and oil all handle link.

Replace Center Section Assemblies:

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. Remove valve sections by sliding them along the tie rods.

7. Thoroughly clean the O-ring counterbores and ground surfaces. Place new O-ring seals (ordered as a kit) in the proper counterbores.

8. Replace the sections on the tie rods with the O-ring counterbores facing the right end of the valve, being careful not to move the O-rings from the counterbores.

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 and stick.

The cylinder ports must be pointing upward and hoses must be routed above the cylinder to the mainframe pivot pin connection.

1. The palletized backhoe is shipped from the factory. Remove stabilizers and fasteners from the pallet.

2. Position the stabilizer between the mounting lugs and pin it into place.

3. Cut the plastic ties from the rod ends of the hydraulic cylinders.

4. Swing the rod end down and pull it out to align with the stabilizer mounting lugs.

5. Pin it into place with the provided fasteners.

Recommended Torque in Foot Pounds (Newton Meters). Use 75% of the specified value for plated fasteners and 85% for lubricated fasteners.

Recommended torque in foot pounds (Newton Meters). Use 75% of the specified value for plated fasteners and 85% for lubricated fasteners.