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Replacing the Drive Belt
The blade drive belt, tensioned by the stationary idler
pulley, is very durable. However, after many hours of use,
the belt will show signs of wear. Signs of a worn belt are:
squealing when belt is rotating, blades slipping when
cutting grass, frayed edges, burn marks and cracks. Replace
the belt if any of these conditions are evident.
1. Lower the cutting unit to the shop floor. Remove the
belt covers from the top of the cutting unit and set the
covers aside.
2. Loosen the nut securing the idler pulley to the cutting
unit (Fig. 77). Move the pulley away from the belt to
release the belt tension.
3. Remove the bolts securing the hydraulic motor to the
cutting unit (Fig. 87). Lift the motor off of the cutting
unit and lay it on top of the cutting unit.
2
Figure 87
1. Hydraulic motor
4. Remove the old belt from around the spindle pulleys
and idler pulley.
5. Route the new belt around the spindle pulleys and idler
pulley assembly.
6. Position the hydraulic motor on the cutting unit after
routing the belt around the pulleys. Mount the motor to
the cutting unit with bolts removed in step 3.
7. Using approximately 45 lb. of force for a used belt
(90 lb. for a new belt), slide the idler pulley against the
belt.
8. Hold the pulley in position and tighten the nut.
9. Install the belt covers.
2
1
2. Mounting bolts
53
Replacing the Cutting Unit
Hinge Covers
The hinge cover prevents debris from escaping at hinge
points between cutting units. If cover(s) ever become
damaged or worm they must be replaced.
Figure 88
1. Hinge cover
Torque Lock Nuts
After the first 50 hours, the lock nuts on the lower pivot
links (Fig. 89), the lift arm pins (Fig. 90) and the wing deck
cylinder mounts (Fig. 91) must be torqued to
160–180 ft–lb.
1
Figure 89
1. Lower pivot link nut (4)
1
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