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®
BUSH HOG
GEARDRIVE
HAY MOWERS
SERIES GHM 700, GHM 800, GHM 900
GHM 1800 & GHM 1900
Operator’s Manual
ASSEMBLY OPERATION MAINTENANCE
1297
$4.00 Part No. 99707
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CONGRATULATIONS! You have invested in the best implement of its type on the market today. The care you give your Bush Hog implement will greatly determine your satisfaction with its performance and its service life. We urge a careful study of this manual to provide you with a thorough understanding of your new implement before operating, as well as suggestions for operation and maintenance. If your manual should become lost or destroyed, Bush Hog will be glad to provide you with a new copy. Orde
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GHM HAY MOWER TABLE OF CONTENTS SECTION/PARA PAGE SECTION/PARA PAGE Warranty.......................................................3 IV.MAINTENANCE.........................................12 Dealer Preparation Check List.....................4 4-1 Maintenance Check List ......................12 Safety Precautions.......................................5 4-2 Lubrication ...........................................13 Federal Laws and Regu
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® BUSH HOG LIMITED WARRANTY Bush Hog warrants to the original purchaser of any new Bush Hog equipment, purchased from an authorized Bush Hog dealer, that the equipment be free from defects in material and workmanship for a period of one (1) year for non-commercial, state, and municipalities’ use and ninety (90) days for commercial use from date of retail sale. The obligation of Bush Hog to the purchaser under this warranty is limited to the repair or replacement of defective parts. Replacement o
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DEALER PREPARATION CHECK LIST GHM HAY MOWER BEFORE DELIVERING MACHINE — The following check list should be completed. Use the Operator’s Manual as a guide. ❒ 1. Assembly completed. ❒ 2. Gearbox filled with oil. ❒ 3. All fittings lubricated. ❒ 4. All shields in place and in good condition. ❒ 5. All fasteners torqued to specifications given in Torque Chart. ❒ 6. All decals in place and readable. (See decal page.) ❒ 7. Overall condition good (i.e. paint, welds) ❒ 8. Operators manual has been delive
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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 depen- dent upon the awareness, concern, prudence and proper training of pe
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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 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 health
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SECTION 1 INTRODUCTION AND DESCRIPTION 1-2 DESCRIPTION 1-1 INTRODUCTION The GHM (Figure 1-1) is intended for cutting hay We are pleased to have you as a Bush Hog cus- and grass in a clean maintained area. A breakaway tomer. Your GHM hay mower has been carefully mechanism built into the three point hitch allows cut- designed to give maximum service with minimum ter bar to pivot back if a stationary object is hit. The down time. This manual is provided to give you the cutter bar consists of indivi
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SECTION II PREPARATION FOR USE Figure 2-1 Hitch Adjustments WARNING TO AVOID SERIOUS INJURY OR DEATH NEVER STAND BETWEEN TRACTOR NARROW AND MOWER WHILE TRACTOR IS BEING BACKED TO HITCH. WARNING TO AVOID SERIOUS INJURY OR DEATH ADDITIONAL TRACTOR FRONT BAL- LAST MAY BE NEEDED FOR STABLE OPERATION AND TRANSPORT OF MOWER. SEE TRACTOR OPERATOR’S MANUAL FOR RECOMMENDED WEIGHTS. During mower operations, the right tractor tire should run on stubble between the cut and uncut crop. As shown in Figure 2-1
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D. Attach PTO driveline to tractor 540 rpm or H. Check to be certain all persons are clear of 1000 rpm PTO shaft. Make certain driveline is cutter bar. securely connected at both ends. Attach PTO drive- I. Raise mower using tractor 3-point lift. Raise line shield safety chain on both the implement and cutter bar to transport position. When cylinder “bot- tractor ends. (Figure 2-3) toms out” hold valve open an additional 3-5 seconds to purge air from system. J. Pin transport lock to retain cutter
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SECTION III OPERATING INSTRUCTIONS 3-3 TRANSPORTING 3-1 GENERAL SAFETY WARNING Only qualified people familiar with this operator’s TO AVOID SERIOUS INJURY OR DEATH, manual should operate this machine. Operator DO NOT ALLOW CUTTER BAR TO CON- should wear hard hat, safety glasses and safety TACT ELECTRICAL WIRES. USE CARE shoes. The operator should read, understand and WHEN PASSING BENEATH OVERHEAD practice all safety messages shown on the caution, OBSTRUCTIONS. warning and danger decals affixed t
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Breakaway pressure is regulated by the tension of E. With tractor at idle speed, engage PTO drive. the latch springs (Figure 3-3). Spring length as Set tractor throttle for 540 PTO rpm for models GHM shipped from the factory is 4-1/8” and is satisfactory 700, GHM 800, and GHM 900 and 1000 PTO rpm for most conditions. Breakaway pressure can be for models GHM 1800 and GHM 1900. increased by turning spring retaining nuts clockwise F. Place tractor in a gear that will give proper or decreased by tur
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5-1/2” Figure 3-5 Helper Spring Assembly 3-7 CUTTER BAR HELPER SPRING ADJUSTMENT (9’ MODELS ONLY) The 9’ models are equipped with a helper spring assembly to transfer cutter bar weight from the outer end of the cutter bar back to the frame assembly. The recommended minimum adjustment measurement is 5-1/2” from under the bolt head to the end of the rod weldment nut. (Figure 3-5) To transfer more weight, shorten the measurement. To transfer less weight, lengthen the measurement. Be ad
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AFTER EACH USE Figure 4-1a 1. Clean all debris from machine. Replace any (2) BEfore Each Use missing or illegible decals. 2. Inspect mower for worn or damaged components. Repair or replace before next use. Any replace (1) Before Each Use ment components installed during repair shall include the components current safety decals specified by the manufacturer to be affixed to the component. 3. Store mower in a dry place. 4-2 LUBRICATION (Figures 4-1a, b, c, d) NOTE The multi-purpose grease refe
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4-3 BLADE REPLACEMENT 4-5 BELT REPLACEMENT The disc mower blades each have two cutting Replacement belts are sold in matched sets. To edges. When one edge becomes dull or damaged, maintain an equal amount of tension on each belt, remove the bolt and turn the blade over, Nuts can be replace all belts at same time. Use only genuine re-used if not damaged. If both cutting edges of the Bush Hog replacement parts. Replace as follows: blade have been used, the blades must be replaced. A. Remove belt s
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(Curtain Removed To Show Details Only) Figure 4-5 Standard Crop Divider Blade Disc Cap Covering Retaining Nut Cutter Bar Figure 4-6 Standard Crop Divider Figure 4-7 Optional Crop Divider Cutter Hub Cap Threaded Rod Jam Nut Crop Cap Cap Divider Crop Divider Retaining Nut Blade Disc Assembly Output Shaft Retaining Nut The blade disc assembly is now ready to be Blade Disc Output Shaft removed from the cutter bar. If required, a steady Assembly Figure 4-8 Cutter Bar prying force
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STANDARD CROP DIVIDER (Figure 4-6) Reattach 4-8 CUTTER BAR INSTALLATION the cap and cutter to the crop divider by reinstalling the four(4) capscrews through the top of crop divider A. Install gearbox into frame, securing with front and tightening securely. mounting lug and two bolts. (Figure 4-10) B. Install sheave (Figure 4-11) onto gearbox input OPTIONAL CROP DIVIDER (Figure 4-7) Tilt cap shaft and key aligning with driver sheave. Alternately sideways and insert cap assembly into the top of t
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Figure 4-11 (3) Retaining Plate Pivot Bolt Belt Tension Key Adjusting Bolt Bushing (1) Belts Securing Bolts (2) Sheave 4-9 TROUBLESHOOTING Troubleshooting procedures are listed in Table 4-1 below. If the problem cannot be solved or replacement parts are necessary, contact your authorized Bush Hog dealer. Please have ready your machine name, model num- ber, serial number, purchase date and exact cause or description of problem. Table 4-1 Troubleshooting PROBLEM PROBABLE CAUSE REMEDY Uneven or str
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Figure 4-12 Cutter Bar Arrangement and Blade Rotation 8’ 7’ 9’ MAIN GEARBOX MAIN GEARBOX MAIN GEARBOX CW CW CW #1 #1 #1 #2 CCW CW CW #2 #2 CW #3 #3 CCW #3 CCW CCW #4 CW CW #4 #4 CW #5 #5 #5 CCW CCW #6 CCW CW #6 #7 CCW FORWARD NOTE The blades of adjacent oval discs must be 90° apart from one another as shown above to ensure proper timing. 18
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SECTION V ASSEMBLY CAUTION THE FOLLOWING SAFETY PRECAUTIONS SHOULD BE THOROUGHLY UNDERSTOOD BEFORE ATTEMPTING MACHINE ASSEMBLY. 1. Wear protective equipment such as , but not limited to, protection for eyes, ears, feet, hands, lungs and head when assembling the equipment. Do not wear loose clothing or jewelry that may catch on equipment moving parts. 2. Do not lift heavy parts or assemblies. Use crane, jack, tackle, fork t5rucks, or other mechanical devices. 3. Select an area for assembly that
