Belt Maintenance; Servicing The Alternator Belt; Servicing The Compressor Belt; Tensioning The Blade-Drive Belts - Toro Groundsmaster 4000 Operator's Manual

Belt Maintenance

Servicing the Alternator
Belt
Service Interval: After the first 10 hours
Every 100 hours
Proper tension of the belt 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 100
1. Alternator
2. Mounting bolt
Servicing the Compressor
Belt
Service Interval: After the first 10 hours
Every 100 hours
1. Proper tension of the belt 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.
2. If the deflection is not 10 mm (3/8 inch), loosen
the idler pulley mounting bolt
Note:
Increase or decrease the compressor-belt
tension and tighten the bolt. Check the deflection
of the belt again to ensure that the tension is
correct.
(Figure 100).
3. Compressor
4. Idler pulley
(Figure 100).
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
Note:
Ensure that the belt is positioned on the spring
side of the belt guide
1. Belt
2. Eye bolt
g020460
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 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
70
(Figure 101).
(Figure 101).
Figure 101
4. Belt guide
5. Flange nut
6. Stop bolt
(Figure 101).
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