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Belt Maintenance
Servicing the Alternator Belt
Service Interval: After the first 10 hours
Every 100 hours
Proper tension allows 10 mm (3/8 inch) of deflection when
a force of 44 N∙m (10 ft-lb) is applied on the belt midway
between the pulleys.
If the deflection is not 10 mm (3/8 inch), loosen the
alternator-mounting bolts
Note: Increase or decrease the alternator-belt tension and
tighten the bolts. Check the deflection of the belt again to
ensure that the tension is correct.
Figure 72
1. Alternator
2. Mounting bolt
Servicing the Air Conditioner
Compressor Belt
Service Interval: After the first 10 hours
Every 100 hours
Cab model only
Check the condition and tension of the belt
every 100 operating hours.
1. Proper tension will allow 10 mm (3/8 inch) deflection
when a force of 44 N (10 lb) is applied on the belt
midway between the pulleys.
2. If the deflection is not 10 mm (3/8 inch), loosen the
idler pulley mounting bolt
decrease the compressor belt tension and tighten the
bolt. Check the deflection of the belt again to ensure
that the tension is correct.
(Figure
72).
3. Compressor
4. Idler pulley
(Figure
(Figure
72). Increase or
Tensioning the Blade-Drive
Belts
Service Interval: After the first 10 hours
Every 50 hours
When properly tensioned, the inside measurement of the
extension spring (hook to hook) should be approximately
8.3 to 9.5 cm (3-1/4 to 3-3/4 inches). Once the correct
spring tension is attained, adjust the stop bolt (carriage bolt)
until there is approximately 2 to 5 mm (0.065 to 0.185 inch)
clearance between the head of the bolt and the idler arm
(Figure
73).
Note: Ensure that the belt is positioned on the spring side
of the belt guide
1. Belt
2. Eye bolt
3. Extension spring
Replacing the Blade-Drive Belt
Service Interval: Every 800 hours
The blade-drive belt, tensioned by the spring-loaded 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 the 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 mower deck to the shop floor, remove the
72) after
belt covers from the top of the mower deck, and set
the covers aside.
2. Loosen the eye bolt allowing the removal of the
extension spring
3. Loosen the flange nut securing the stop bolt to the
mounting tab and move the idler pulley away from the
belt to release the belt tension
Note: Loosen the nut enough to allow the idler arm
to pass the stop bolt.
57
(Figure
73).
Figure 73
4. Belt guide
5. Flange nut
6. Stop bolt
(Figure
73).
(Figure
73).
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