75CBH BACKHOE Published 11/11 Part No. 50069997 OPERATOR’S MANUAL This Operator's Manual is an integral part of the safe operation of this machine and must be maintained with the unit at all times. READ, UNDERSTAND, and FOLLOW the Safety and Operation Instructions contained in this manual before operating the equipment. C01Cover BUSH HOG ® 2501 Griffin Ave. Selma, AL 36703 334-874-2700 www.bushhog.com © 2011 Alamo Group Inc. $0.
TO THE OWNER/OPERATOR/DEALER All implements with moving parts are potentially hazardous. There is no substitute for a cautious, safe-minded operator who recognizes the potential hazards and follows reasonable safety practices. The manufacturer has designed this implement to be used with all its safety equipment properly attached to minimize the chance of accidents. BEFORE YOU START! Read the safety messages on the implement and shown in your manual.
TABLE OF CONTENTS SAFETY SECTION ............................................................................................................................... 1-1 General Safety Instructions and Practices .............................................................................. 1-2 Connecting and Disconnecting Safety Instructions and Practices .......................................... 1-5 Equipment Operation Safety Instructions and Practices .........................................................
BUCKET TOOTH POINTS ...................................................................................................... 4-4 TIGHTENING NUTS AND BOLTS .......................................................................................... 4-4 LUBRICATION ........................................................................................................................ 4-4 LUBRICATION CHART ...........................................................................................................
SAFETY SECTION Safety Section 1-1
SAFETY General Safety Instructions and Practices SAFETY A careful operator is the best operator. Safety is of primary importance to the manufacturer and should be to the owner/operator. Most accidents can be avoided by being aware of your equipment, your surroundings, and observing certain precautions. The first section of this manual includes a list of Safety Messages that, if followed, will help protect the operator and bystanders from injury or death.
SAFETY Never operate the Tractor or Implement until you have read and completely understand this Manual, the Tractor Operator’s Manual, and each of the Safety Messages found in the Manual or on the Tractor and Implement. Learn how to stop the tractor engine suddenly in an emergency. Never allow inexperienced or untrained personnel to operate the Tractor or Implement without supervision. Make sure the operator has fully read and understood the manuals prior to operation.
SAFETY Never run the Tractor engine in a closed building or without adequate ventilation. The exhaust fumes can be hazardous to your health. (SG-23) Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the state of California to cause cancer, birth defects or other reproductive harm.
SAFETY Use caution and wear protective gloves when handling sharp objects such as blades, knives, and other cutting edges. Be alert to worn component surfaces which have sharp edges. Sharp surfaces can inflict severe laceration injuries if proper hand protection is not worn. (SG-37) For your protection while operating or servicing equipment, wear relatively tight and belted clothing to avoid entanglement in moving parts. Tie up and protect long hair that could become entangled in machinery.
SAFETY Make sure the hydraulic quick disconnects are fully seated into the connections. Do not use the Backhoe if the hydraulic connection is leaking. Leaking oil could allow the Backhoe to fall resulting in a serious crushing injury. (SBH-21) SAFETY Make sure all air is purged from the hydraulic system before using the Backhoe. Air in the system can cause the Backhoe to respond sluggishly or with unexpected movement.
SAFETY Start tractor only when properly seated in the Tractor seat. Starting a tractor in gear can result in injury or death. Read the Tractor operators manual for proper starting instructions. (SG-13) Operate the Tractor and/or Implement controls only while properly seated in the Tractor seat with the seat belt securely fastened around you. Inadvertent movement of the Tractor or Implement may cause serious injury or death.
SAFETY Operate the tractor and Backhoe only in conditions where you have clear visibility in daylight or with adequate artificial lighting. Never operate in darkness or foggy conditions where you cannot clearly see at least 100 feet in front and to the sides of the tractor. Make sure you can clearly see bystanders, ditches, steep slopes, drop-offs, overhead obstructions, power lines, and debris or obstruction in the travel path. If you are unable to clearly see these types of items discontinue operating.
SAFETY Never walk or work under any raised boom or bucket. The Boom could fall and cause serious bodily injury or death. Always lower the boom and bucket flat on the ground or support the Boom and bucket on safety stands. Unload all hydraulic actuators prior to performing any maintenance. To do this, set the bucket on the ground then kill the tractor engine. Push and pull the control levers in and out several times to remove pressure.
SAFETY Do not work from the backhoe or attachments. Do now allow any riders on the backhoe, tractor or attachments. Falling off could result in serious injury. (SBH-34) SAFETY Use extreme care when digging, transporting or dumping loads that impair or partially block the operator’s line of sight. Know where you are traveling. Make sure no bystanders are in the area of travel. If a bystander assists in providing guidance, make sure they are not in the path of travel.
SAFETY BEFORE leaving the tractor seat lower the implement, set the parking brake and/or set the tractor transmission in parking gear, disengage the PTO, stop the engine, remove the key, and wait for all moving parts to stop. Place the tractor shift lever into a low range or parking gear to prevent the tractor from rolling. Never dismount a Tractor that is moving or while the engine is running. Operate the Tractor controls from the tractor seat only.
SAFETY Do not drive near the edge of a ditch or excavation. The soil could giveway resulting in loss of control or rollover. (SBH-46) Use extra care when turning or stopping. Allow for increased length and weight of added backhoe. The backhoe adds five to six feet of length in rear of the tractor and significant weight. Allow extra distance when stopping or turning. Do not allow backhoe or attachment to contact solid objects.
SAFETY Always look behind you before backing up. Make sure you are looking in the direction of travel. A bystander could walk behind the tractor. Running into a bystander can result in serious injury or death. (SBH-27) Storage Safety Instructions and Practices Always lower legs and bucket to the ground and engage the swing lock when the Backhoe is not in use. (SBH-8) (SBH-12) Do not remove the attachment from the Backhoe when the Backhoe is disconnected from the tractor.
SAFETY SAFETY Periodically inspect all moving parts for wear and replace when necessary with authorized service parts. Look for loose fasteners, worn or broken parts, and leaky or loose fittings. Make sure all pins have cotter pins and washers. Serious injury may occur from not maintaining this machine in good working order. (SG-21) Always maintain the safety signs in good readable condition. If the safety signs are missing, damaged, or unreadable, obtain and install replacement safety signs immediately.
SAFETY Decal Location SAFETY 75CBH 11/11 © 2011 Alamo Group Inc.
SAFETY SAFETY ITEM PART NO. QTY LEVEL DESCRIPTION 1. 45970 1 WARNING To Prevent Bodily Injury 2. 44907 1 WARNING To Prevent Instability 3. 44895 2 DANGER Crushing Hazard 4. 44896 1 WARNING To Prevent Bodily Injury 5. 44897 2 DANGER Crushing Hazard 6. 44898 1 OPERATION Boom Operation 7. 44899 1 OPERATION Dipperstick & Bucket Operation 8. 44900 1 OPERATION Left Side Stabilizer Position 9. 44901 1 OPERATION Right Side Stabilizer Position 10.
SAFETY Decal Description 10 -- 44908 8 -- 44900 7 -- 44899 13 -- 50069981 14 -- 50069982 15 -- 50057411 75CBH 11/11 © 2011 Alamo Group Inc.
SAFETY SAFETY Note: Safety decal location is listed below each decal. Replace decal if damaged or illegible. Replacement decals are available from dealer. 4 -- 44896 1 -- 45970 3 -- 44895 5 -- 44897 12 -- 48280 2 -- 44907 75CBH 11/11 © 2011 Alamo Group Inc.
SAFETY Federal Laws and Regulations This section is intended to explain in broad terms the concept and effect of federal laws and regulations concerning employer and employee equipment operators. This section is not intended as a legal interpretation of the law and should not be considered as such. Employer-Employee Operator Regulations U.S. Public Law 91-596 (The Williams-Steiger Occupational and Health Act of 1970) OSHA Title 29, Code of Federal Regulations Part 1928.57(a)(6). www.osha.
INTRODUCTION SECTION Introduction Section 2-1
INTRODUCTION INTRODUCTION Bush Hog CBH Series Backhoes are designed to provide years of outstanding service. CBH Series Backhoes are designed to fit on a wide range of compact and utility class tractors operating in a wide range of conditions. CBH Series backhoes should be mounted to a sub-frame on tractors smaller than 50 PTO HP or to a 3-Point mount for larger tractors. The purpose of this manual is to assist you with proper assembly, operation and maintenance of your new CBH Series Backhoe.
INTRODUCTION SPECIFICATIONS Specifications may vary depending on tractor model, tire size and bucket used and are subject to change without notification. Tractor must be equipped with ROPS and seat belt that will provide greater safety and installation of backhoe subframe. GENERAL DATA Digging Depth (two foot flat bottom) ...............................................85.25” Reach from center line of Swing Pivot............................................117.58” Loading Height (bucket at 60°) .............
INTRODUCTION INTRODUCTION 75CBH 11/11 © 2011 Alamo Group Inc.
ASSEMBLY SECTION Assembly Section 3-1
ASSEMBLY ASSEMBLY INSTALLING PUMP KIT (Optional) WARNING: Do not modify or alter this implement. Do not permit anyone to modify or alter this Implement, any of its components or any Implement function. 1. Fasten PTO adapter (16) to hydraulic pump (6) using 5/16 x 1/2 set screws (17). Fasten hydraulic pump (6) to pump mounting bracket (15) using 3/8-16 x 1-1/2 cap screws (18) and 3/8-16 lock nuts (21). 2.
ASSEMBLY INSTALLING THREE POINT ADAPTER (Option) ASSEMBLY 1. Install link pins (7) to backhoe using 7/8 lock washers (14) and 7/8 nuts (15). 2. Join upper link (1) and center link (2) using 3/4 x 2-1/2 cap screws (9) and 3/4 lock nuts (11). Leave a minimum of 3-3/4 inches between bolts. NOTE: Leave hardware loose. Assembly may need to be lengthened or shortened to mount backhoe mainframe in vertical position. 75CBH 11/11 © 2011 Alamo Group Inc. 3.
ASSEMBLY MOUNTING BACKHOE TO TRACTOR ASSEMBLY 1. Back tractor close enough to backhoe to connect hose kit or pump to tractor. WARNING: BEFORE leaving the Power Unit Seat, always engage the brake and set the Power Unit transmission in parking gear, disengage the auxiliary hydraulics, stop the engine, remove the key, and wait for all moving parts to stop. 2. 3. 4. Using backhoe hydraulics, lower stabilizers until backhoe can be connected to 3-point hitch.
OPERATION SECTION Operation Section 4-1
OPERATION CAUTION: To avoid possible injury, observe the following safety rules BEFORE OPERATING backhoe. • Be sure area is clear of underground utilities or other hazards. • Position a barricade around work area. • Keep bystanders a safe distance away. OPERATION PRE-OPERATION CHECKLIST This backhoe is designed for safety, durability and operator convenience. To insure satisfactory performance, complete the following check list and make all necessary adjustments before initial operation. 1.
OPERATION Move dipperstick toward operator and extend bucket by moving lever back and to the right. The two operations of the boom and swing lever combined with the two operations performed by bucket and dipperstick control lever provide four simultaneous operations of the two levers. Oil flow will go to operation which requires the least pressure. The ability to feather valve spools and balance pressure comes with experience resulting in reduced cycle times.
OPERATION OPERATION FILLING BUCKET DUMPING 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. 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.
OPERATION Position the unit so the backhoe swing post is over the center line of the trench connection. Dig with the backhoe at extreme swing positions, and in as close to the stabilizers as possible. Pile the soil on the opposite side of the trenches. SIDE SLOPE EXCAVATING OR TRENCHING Dig with the backhoe uphill whenever possible. 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.
OPERATION When on the side of a steep slope, cut a level surface along the uphill side of the trench with the loader. OPERATION Pile the spoil of the cut downhill. When digging, pile the spoil of the trench uphill. Dig field trenches progressively. As soon as one trench is completed, have the work men lay the tile. Start the next trench, using the spoil to fill the previous trench.
OPERATION BACKFILLING MOUNTING AND DISMOUNTING BUCKETS Backfill by lifting the bucket over the spoil pile and then crowding in. Pull both the crowd and lift levers for smooth, even backfilling. Mount buckets using 1 x 6-5/8 antirotation pins (1), 3/8 x 11/8 cap screws (2) and lock nuts (3). IMPORTANT: Do not backfill by using the swing circuit and dragging the bucket sideways. Doing so can cause damage to the dipstick, boom, swing cylinders, or mainframe.
OPERATION PLACING THE STABILIZERS OPERATION Set the stabilizers to remove weight from the rear wheels. Rear wheels are to remain touching the ground as this provides for the widest stabilizer stance and lowest center of gravity. Raising the wheels off the ground will not only reduce stability and digging depth, but impair performance and impose unnecessary stress on the backhoe and tractor.
OPERATION REMOVAL FROM TRACTOR - STORAGE NOTE: For added stability, rest backhoe or subframe on wood blocks or plywood. 7. 8. 9. Shut off tractor. Work handles back and forth to relieve hydraulic pressure. Disconnect hydraulic lines or pump from backhoe. For long term storage, coat all exposed cylinder rods with grease. Lubricate all grease fittings, stabilizer pivot pins and complete handle linkage. WARNING: To avoid injury during removal of backhoe: • Do not permit bystanders within 15 feet.
MAINTENANCE SECTION Maintenance Section 5-1
MAINTENANCE MAINTENANCE CYLINDER SERVICE CYLINDER ASSEMBLY Cylinder are designed to be reliable and easy to service. If a cylinder should malfunction during warranty period, return complete cylinder assembly, without disassembling, to your authorized service department for instructions. Unauthorized disassembly of a cylinder in warranty period will VOID WARRANTY. Note: Be careful not to damage seals and o-rings on edges or holes in cylinder tube.
MAINTENANCE CAUTION: To avoid possible injury, observe the following safety rules when servicing backhoe. BEGINNING OF SEASON Remove all protective covering. Remove excessive grease from cylinder rods if unit has been in long term storage. Check hydraulic hoses for deterioration and replace if necessary. Caution, hydraulic hoses may be under pressure. Make sure pressure has been relieved before removing hoses. Lubricate all grease fittings and oil handle linkage.
MAINTENANCE MAINTENANCE BUCKET TOOTH POINTS Bucket tooth points are self-sharpening and will require little attention. However, points can be replaced when they become badly worn or broken. Remove point from welded tooth shank by hammering at “A” on tooth point or by driving a chisel at “B”, just between tooth point box section and tooth shank. Install new point and anchor it to shank by peening at location shown.
MAINTENANCE HYDRAULIC TROUBLESHOOTING Hydraulic troubleshooting material presented in this section is offered as a guide to diagnosing probable causes and remedies for general operational problems. PROBLEM Spring centered spools do not return to neutral. Match your problem wiht the typical problem examples given in the possible cause column. These numbers correspond with the possible cause and correction paragraphs that follow.
MAINTENANCE MAINTENANCE POSSIBLE CAUSE CORRECTIVE ACTION 13 Worn or damaged rod seals on cylinder. External leaks. Re-pack cylinder. Rebuild cylinder replacing damaged parts as necessary. 14 Swing linkage jammed. Remove interference. 15 Excessive back pressure. Restriction between “in” and “out” port and reservoir. 16 Paint on valve spool. Sticking valve spool, or scored valve. Clean valve spool. Binding may be caused by over tightened plug, mounting bolt, fitting or tie rod bolt.
MAINTENANCE VALVE SERVICE Top of valve is defined as side where joysticks are installed. Before servicing valve, make sure backhoe has boom locked, stabilizers locked, and dipper in down position. Shut off tractor and relieve pressure by activating valve handles. Use a drip pan below backhoe to catch any escaping oil during removal of valve. MAIN RELIEF REPLACEMENT 1. 2. 3. 4. 5. Use a socket to remove main relief from valve housing.
MAINTENANCE MAINTENANCE 75CBH 11/11 © 2011 Alamo Group Inc.
MAINTENANCE PARTS LIST DESCRIPTION QTY. O-RING O-RING VALVE BODY/RELIEF PISTON SPRING O-RING REGISTER NUT, M16-1.5 DEFLECTOR O-RING CENTERING RING SPRING SPACER SCREW CAP SCREW SCREW CIRCLIP WASHER BUSHING SPRING BALL HOLDER STEEL BALL D.5 STEEL BALL D.7 CAP WASHER SPACER SPRING SPACER CENTERING RING O-RING 15.10 X 2.70 X 1.5 PLUG COPPER GASKET 14 X 20 X 15 REGISTER SPRING PISTON VALVE BODY/RELIEF O-RING 17.17 X 1.78 O-RING PLUG O-RING 17.17 X 1.78 O-RING PLUG SPRING O-RING 11.11 X 1.
MAINTENANCE MAINTENANCE PROPER TORQUE FOR FASTENERS 75CBH 11/11 © 2011 Alamo Group Inc.
LIMITED WARRANTY Bush Hog warrants to the original purchaser of any new Bush Hog equipment, purchased from an authorized Bush Hog dealer, that the equipment be free from defects in material and workmanship for a period of one (1) year for non-commercial, state and municipalities’ use and ninety (90) days for commercial use from date of retail sale. The obligation of Bush Hog to the purchaser under this warranty is limited to the repair or replacement of defective parts.
TO THE OWNER/OPERATOR/DEALER To keep your implement running efficiently and safely, read your manual thoroughly and follow these directions and the Safety Messages in this Manual. The Table of Contents clearly identifies each section where you can easily find the information you need. The OCCUPATIONAL SAFETY AND HEALTH ACT (1928.51 Subpart C) makes these minimum safety requirements of tractor operators: REQUIRED OF THE OWNER: 1.
75CBH BACKHOE 75CBH-SOM-11/11 Printed U.S.
