Belt Maintenance; Servicing The Alternator Belt; Re-Tensioning The Blade Drive; Belts - Toro 30411 Groundsmaster 4100-D Operator's Manual

Belt Maintenance

Servicing the Alternator Belt

Check the condition and tension of the belts
(Figure 63) after every 100 operating hours.
1. Proper tension will allow 3/8 inch (10 mm)
deflection when a force of 10 lb is applied on
the belt midway between the pulleys.
2. If the deflection is not 3/8 inch (10 mm),
loosen the alternator mounting bolts
(Figure 63). 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 63
1. Alternator
Re-tensioning the Blade
Drive Belts
Check the condition and tension of the cutting
unit drive belts initially after 8 hours of operation
and every 50 operating hours thereafter.
When properly tensioned, the extension
spring (hook to hook) measurement should be
approximately 3.50 ±.25 inch (inside). Once the
correct spring tension is attained, adjust the stop
bolt (carriage bolt) until there is approximately
.125 +.060/-.000 inch clearance between the head
of the bolt and the idler arm (Figure 64).
2. Mounting bolt
Note: Make sure the belt is positioned on the
spring side of the belt guide (Figure 64).
Figure 64
1. Belt
2. Eye bolt
3. Extension spring
Replacing the Blade Drive
Belt
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
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 eye bolt allowing the removal of
the extension spring (Figure 64).
3. Loosen the flange nut securing the stop bolt
to the mounting tab. Back off the nut enough
to allow the idler arm to pass by the stop bolt
(Figure 64). Move the idler pulley away from
the belt to release belt tension.
Note: If the stop bolt is ever removed from
the mounting tab, make sure it is reinstalled
in the hole that aligns the stop bolt head with
the idler arm.
4. Remove the bolts securing the hydraulic motor
to the cutting unit (Figure 65). Lift the motor
off of the cutting unit and lay it on top of the
cutting unit.
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4. Belt guide
5. Flange nut
6. Stop bolt