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Belt Maintenance
Checking the Alternator Belt
Service Interval: Every 200 hours
After the first 10 hours
Check tension of alternator belt (Figure 56) after every 200
operating hours.
1. Apply 10 lb of force to the alternator belt, midway
between the pulleys.
2. If the deflection is not 10 mm (3/8 inch), loosen the
alternator mounting bolts.
Figure 56
1. Mounting bolt
3. Increase or decrease the alternator belt tension and
tighten the bolts.
4. Check the deflection of the belt again to ensure that
the tension is correct.
Replacing the Blade Drive
Belts
Service Interval: Every 50 hours
The blade drive belts, tensioned by the spring loaded idler
pulleys, are very durable. However, after many hours of use,
the belts 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 belts
if any of these conditions are evident.
1. Lower the cutting unit to the 25 mm (1 inch) height of
cut setting, move the throttle lever to the Slow position,
stop the engine, set the parking brake, and remove the
ignition key.
2. Alternator
2. Remove the belt covers from the top of the cutting unit
and set the covers aside.
3. Using a breaker bar or similar tool, move the idler
pulley for the top belt (Figure 57) away from the top
drive belt to release the belt tension and allow the belt
to be slipped off the pulleys.
1. Top belt
2. Top idler pulley
4. Using a breaker bar or similar tool, move the idler
pulley for the bottom belt (Figure 57) away from the
bottom drive belt to release the belt tension and allow
the belt to be slipped off the pulleys.
5. Route a new belt around the gearbox pulley, bottom
spindle pulleys, and idler pulley assembly as shown in
Figure 57.
6. Route a new belt around the top spindle pulleys and
idler pulley assembly as shown in Figure 57.
7. Install the belt covers.
47
Figure 57
3. Bottom belt
4. Bottom idler pulley
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