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.
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.
GHM HAY MOWER TABLE OF CONTENTS SECTION/PARA SECTION/PARA PAGE PAGE IV. MAINTENANCE.........................................12 4-1 Maintenance Check List ......................12 4-2 Lubrication ...........................................13 4-3 Blade Replacement .............................14 4-4 Belt Adjustment....................................14 4-5 Belt Replacement ................................14 4-6 Spindle Housing Removal and Reassembly .........................................
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.
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.
IMPORTANT SAFETY PRECAUTIONS 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 serious bodily injury.
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: “...
SECTION 1 INTRODUCTION AND DESCRIPTION 1-1 INTRODUCTION 1-2 DESCRIPTION We are pleased to have you as a Bush Hog customer. Your GHM hay mower has been carefully designed to give maximum service with minimum down time. This manual is provided to give you the necessary operating and maintenance instructions for keeping your mower in top operating condition. Please read this manual thoroughly. Understand what each control is for and how to use it.
SECTION II PREPARATION FOR USE Figure 2-1 Hitch Adjustments WARNING TO AVOID SERIOUS INJURY OR DEATH NEVER STAND BETWEEN TRACTOR AND MOWER WHILE TRACTOR IS BEING BACKED TO HITCH. NARROW WARNING TO AVOID SERIOUS INJURY OR DEATH ADDITIONAL TRACTOR FRONT BALLAST 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.
D. Attach PTO driveline to tractor 540 rpm or 1000 rpm PTO shaft. Make certain driveline is securely connected at both ends. Attach PTO driveline shield safety chain on both the implement and tractor ends. (Figure 2-3) H. Check to be certain all persons are clear of cutter bar. I. Raise mower using tractor 3-point lift. Raise cutter bar to transport position. When cylinder “bottoms out” hold valve open an additional 3-5 seconds to purge air from system. J.
SECTION III OPERATING INSTRUCTIONS 3-3 TRANSPORTING 3-1 GENERAL SAFETY WARNING TO AVOID SERIOUS INJURY OR DEATH, DO NOT ALLOW CUTTER BAR TO CONTACT ELECTRICAL WIRES. USE CARE WHEN PASSING BENEATH OVERHEAD OBSTRUCTIONS. Raise mower off ground using 3-point hitch. Fully raise cutter bar and pin transport lock in the transport position. (Figure 2-6) Place parking stand in the work position as shown in Figure 2-4.
Breakaway pressure is regulated by the tension of the latch springs (Figure 3-3). Spring length as shipped from the factory is 4-1/8” and is satisfactory for most conditions. Breakaway pressure can be increased by turning spring retaining nuts clockwise or decreased by turning counterclockwise. DO NOT COLLAPSE SPRING TO LESS THAN 3-3/4” OR SPRING WILL BECOME SOLID BEFORE LATCH CAN TRIP. E. With tractor at idle speed, engage PTO drive.
Figure 3-5 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.
AFTER EACH USE 1. Clean all debris from machine. Replace any missing or illegible decals. 2. Inspect mower for worn or damaged components. Repair or replace before next use. Any replace 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.
4-3 BLADE REPLACEMENT 4-5 BELT REPLACEMENT The disc mower blades each have two cutting edges. When one edge becomes dull or damaged, remove the bolt and turn the blade over, Nuts can be re-used if not damaged. If both cutting edges of the blade have been used, the blades must be replaced. Always replace both blades on a spindle to retain balance. When replacing blades, the attaching bolt and nut should also be replaced. Use only genuine Bush Hog replacement parts.
(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 Hub Cap Threaded Rod Jam Nut Cap Cutter Crop Divider Cap Retaining Nut Crop Divider Blade Disc Assembly Output Shaft Retaining Nut The blade disc assembly is now ready to be removed from the cutter bar.
STANDARD CROP DIVIDER (Figure 4-6) Reattach the cap and cutter to the crop divider by reinstalling the four(4) capscrews through the top of crop divider and tightening securely. 4-8 CUTTER BAR INSTALLATION A. Install gearbox into frame, securing with front mounting lug and two bolts. (Figure 4-10) B. Install sheave (Figure 4-11) onto gearbox input shaft and key aligning with driver sheave. Alternately tighten the three retaining bolts. C.
Figure 4-11 (3) Retaining Plate Pivot Bolt Belt Tension Adjusting Bolt Key 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 number, serial number, purchase date and exact cause or description of problem.
Figure 4-12 Cutter Bar Arrangement and Blade Rotation 8’ MAIN GEARBOX 9’ MAIN GEARBOX #1 CW #2 CW #3 CCW #4 CW #5 CCW #6 CW #7 CCW 7’ MAIN GEARBOX CW #1 #2 CCW #3 CW #4 CCW #5 CW #6 #1 #2 CW #3 CCW #4 CW #5 CCW CCW FORWARD NOTE The blades of adjacent oval discs must be 90° apart from one another as shown above to ensure proper timing.
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.
of front and rear curtain support. Q. Fasten transport latch to curtain support beam using a 5/8 x 1-3/4” bolt and locknut. Pin opposite end in place with faspin. R. Install curtain stop weldment flush with end of curtain support beam using one 5/8” U-bolt, lockwasher, flatwashers and nuts. Figure 5-1 Assembly Cutter Bar Helper Spring Beam Spring Cushion Curtain Cylinder Hitch Assy. Cylinder Lug Transport Latch Curtain Support Beam Parking Stand Curtain Support Breakaway Assy.
SAFETY DECALS To promote safe operation, Bush Hog supplies safety decals on all products manufactured. Because damage can occur to safety decals either through shipment, use or reconditioning, Bush Hog will, upon request, provide safety decals for any of our products in the field at no charge. Contact your authorized Bush Hog dealer for more information.
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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 Head Markings SAE Grade 2 (No Dashes) SAE Grade 5 (3 Dashes) ” lt Bo ter “B e m Dia Wrench Size “A” SAE Grade 8 (6 Dashes) METRIC Wrench Size “A” WRENCH SIZE (IN.) “A” BOLT DIAMETER (IN.
® BUSH HOG , L.L.C. P.O. Box 1039 ● Selma, AL 36702-1039 Telephone (334) 874-2700 ● www.bushhog.
