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Belt Maintenance
Checking the Alternator
Belt
Service Interval: Every 100 hours
Proper tension allows 10 mm (3/8 inch) deflection
when a force of 44 N (10 lb) is applied on the belt
midway between the pulleys.
If the deflection is not 10 mm (3/8 inch), complete the
following procedure:
1.
Loosen the alternator mounting bolts
78).
Figure 78
1. Mounting bolt
2.
Increase or decrease the alternator-belt tension
and tighten the bolts.
3.
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 2.54 cm (1 inch)
height-of-cut setting, move the throttle lever
to the S
position, stop the engine, set the
LOW
parking brake, and remove the ignition key.
(Figure
g020537
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 away from the top
drive belt to release the belt tension and slip the
belt 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 away from the
bottom drive belt to release the belt tension
and allow the belt to be slipped off the pulleys
(Figure
79).
5.
Route a new belt around the gearbox pulley,
bottom spindle pulleys, and idler-pulley
assembly as shown in
6.
Route a new belt around the top spindle pulleys
and idler-pulley assembly as shown in
7.
Install the belt covers.
61
(Figure
79).
Figure 79
3. Bottom belt
4. Bottom idler pulley
Figure
79.
Figure
g004486
79.
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