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Manafacture: Bush Hog File size: 679.56 kb File name: Language of manual:

BEFORE EACH USE 1. Driveline Universal Joints - Apply multi-purpose grease with grease gun. 2. Driveline Guard -Apply 2-3 shots of multi-pur- pose grease with grease gun to plastic fitting. 3. Wheels -Apply multi-purpose grease wiith grease gun. 4. Caster Pivot -Apply multi-purpose grease with grease gun. 40 HOURS 5. Input Gearbox - Add EP80W-90 gear oil, if nec- essary, to bring oil level to check plug. 20 HOURS 6. Driveline -Disconnect PTO driveline, pull the two sections apart, thoroughly clean old grease from tubes and apply thin coat of multi-purpose grease to outside of inner (male) section. Reassemble sec- tions and install. Pull each section to be sure drive- line and shields are securely connected. Make cer- tain PTO shielding is in good condition. (6) 20 Hours (1) Before Each UseFigure 4-1B(2) Before Each Use10 40 HOURS 7. Spindle Assembly -Apply multi-purpose grease with grease gun until grease purges out relief hole. Grease fittings for spindles should be accessed by removing the plastic plugs in the shields. After completing lubrication, replace plastic plugs.. Figure 4-1C (7) 40 Hours 3/8” Hex Nuts -Spring Length Adjustment 4-3 BELT ADJUSTMENT Belt tension should be checked every 40 hours to get maximum life from drive belt and best perfor- mance from cutter. Belt tension is adjusted by increasing or decreasing the length of the spring on the moveable idler. For proper belt tension on the 48” mower, the spring length should be set at 7-1/16”. For proper belt tension on the 60” mowers, the spring length should be set at 6-5/8”. For proper belt tension on the 72” mowers, the spring length should be set at 7-7/8”. (Figure 4-1C). To adjust the spring length, loosen or tighten the 3/8” hex nuts on the spring adjustment rod until the correct spring length is reached. 4-4 BELT REPLACEMENT Use only genuine Bush Hog replacement parts. A. Remove right and left side shields. B. Relieve spring tension by loosening the two 3/8” hex nuts on the spring adjustment rod. (Figure 4-1C) C. Remove old belt. D. Install new belt, referring to the diagrams below. (Also refer to the decal on the mower deck) Be sure that the belt is properly positioned in all sheave grooves. E. Adjust tension on the belt by adjusting the length of the spring on the moveable idler. The correct spring lengths are 71.16”, 65.8”, and 77.8” for the 48”, 60” and 72” mowers respectively. F. Replace right and left side shields. FTH 480 BELT DIAGRAM FRONTBELT INSTALLATION GUIDE ATH/FTH 600,720 BELT DIAGRAM FRONTBELT INSTALLATION GUIDE 11 Figure 4-2 Blade Placement 4-5 BLADE REPLACEMENT CAUTION WEAR HEAVY WORK GLOVES TO PROTECT HANDS FROM SHARP EDGES. A. Raise cutter using tractor 3-point lift and SECURELY BLOCK INTO POSITION. B. Turn off tractor, set parking brake and remove key. C. Remove bolt and cup washer securing blade to spindle. Remove blade. D. Install new blade as shown in Figure 4-2 with con- cave side of cup washer against blade. Be sure that blades are installed with offset in proper direction. Tighten retaining bolt to 76 ft./lbs. Retaining BoltCup WasherBladeSpindle Assembly 4-6 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 Uneven Cut PROBABLE CAUSE Cutter not level side to side or front to rear. REMEDY See SECTION III. Belt slipping. Adjust belt perparagraph 4-3. Worn or bent blade(s). Replace blade(s). Streaking or Windrowing Possible build-upof material under cutter. Clean cutter. Cutter not level. See SECTION III. Worn blades. Replace blades. Belt slipping. Adjust belt perparagraph 4-3. Noisy Cutter Loose components. Check all bolts for tightness. Low oil in gearbox. Check oil per paragraph 4-2. Rapid Blade Wear(cutting edge) Blade contactingground. Adjust cutting height to eliminate ground contact. Cutter Vibrating Cutter not beingoperated at ratedPTO speed. Set tractor throttle for proper PTO speed. Blade(s) bent. Replace blades. Foreign object wrapped around spindle or blade. Remove object. 12 SECTION V DEALER ASSEMBLY CAUTION THE FOLLOWING SAFETY PRECAUTIONS SHOULD BE THOROUGHLY UNDERSTOOD BEFORE ATTEMPTING MACHINE ASSEMBLY. 1. Wear personal protective equipment such as, but not limited to, protection for eyes, ears, feet, hands, lungs and head when assembling the equip- ment. 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 trucks or other mechanical devices. 3. Select an area for assembly that is clean and free of any debris which might cause persons work- ing on the assembly to trip. 4. Arrange parts to be assembled neatly in the work area and have tools or other mechanical assist- ing devices in easy reach. 5. Inspect all parts...

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