4-3 BLADE REPLACEMENT
WARNING
THE TILLER CAN FALL FROM HYDRAULIC SYSTEM FAILURE. TO AVOID SERIOUS INJURY OR DEATH, SECURELY SUPPORT TILLER BEFORE WORKING UNDERNEATH.
Tiller blades should be replaced when they have approximately 1/4” of wear left on tip of blade.(Figure 4-7) To replace blades, remove bolts securing blade. Install new blade in its place. Blade must be a right or left corresponding to the blade removed. Pay spe- cial attention to the bolts on the blades; the bolt head must be placed on the blade side, with the washer and the nut on the flange side so that the bolts can- not loosen while the equipment is being used. When several blades must be replaced, replace one blade at a time, so that the initial layout is maintained. (Figure 4-8) Tighten blade bolts to 70 ft. lbs. Use only genuine Bush Hog replacement parts.
Figure 4-7
1/4” Minimum
Bolt Head
Against Blade
Figure 4-8
Helical Arrangement
4-4 SLIP CLUTCH OPERATIONAL CHECK
After tiller has been stored for 30 days or more, perform the following operational check:
A. Loosen eight nuts retaining clutch springs exactly one full turn.
B. With tiller blades firmly on ground and tractor at idle speed, engage tractor PTO drive for 2-3 sec- onds. Clutch should slip without turning blades. If clutch does not slip, contact your authorized Bush Hog dealer.
C. Retighten nuts to within 1/64” of original position. Initial spring length is 1-1/16” (27mm). (Figure 4-9)
CAUTION
FAILURE TO RETIGHTEN SPRING NUTS TO ORIGINAL POSITION MAY CAUSE DAMAGE TO TILLER AND/OR TRACTOR DUE TO IMPROPER SLIP CLUTCH TORQUE SETTING.
4-5 SLIP CLUTCH ADJUSTMENT
The slip clutch is factory preset to the correct torque for protecting implement and tractor. Periodic adjustment is recommended; refer to Section 4-4. Should adjustment be needed, first check to be sure all spring lengths are within 1/64” of being the same. Initial spring length is 1-1/16” (27mm) shown in Figure 4-9. If necessary, loosen nut on any spring that is unequal. Adjust all eight spring retaining nuts 2/3 of a turn (2 flats on a nut) and check clutch slip- page. If further adjustment is necessary, do so in 1/3 turn increments or consult your Bush Hog dealer. Adjust only to provide sufficient torque to prevent slippage under normal conditions. When rocks, roots, etc. are present, occasional slippage is normal for
drivetrain protection.
Figure 4-9
Clutch Spring Length
1-1/16” (27mm)
