Adjusting Idler Pulley; Replacing The Drive Belt - Toro 30555 Operator's Manual

ADJUSTING THE IDLER PULLEY
The idler pulley applies force against the belt so power can be trans-
mitted to the blade pulleys. If the idler is not tensioned against the
belt with sufficient force, maximum power will not be transmitted
to the pulleys. Tension on the belt requires 54 to 68 Nm of torque
on the large nut, which applies force against the belt If the idler is
not adjusted to these specifications, adjustment is necessary.
1. Position the machine on a level surface, lower the cutting unit,
engage the parking brake, be sure the traction pedal is in neu-
tral position, the PTO lever in OFF position, shut engine OFF
and remove the key from the switch.
2. Release and unhook latches securing center cover to top of the
cutting unit. Remove cover from the cutting unit.
3. Loosen two nuts securing idler plate in place. Using a socket
and torque wrench, tighten the idler adjusting nut to 47 Nm.
4. Hold the torque against the belt and tighten the two nuts so
idler plate is held securely in place. Release the idler adjusting
nut. Install the cover and secure the latches.

REPLACING THE DRIVE BELT

The blade drive belt, tensioned by the adjustable idler, 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 rotat-
ing, blades slipping when cutting grass, frayed edges, burn marks
and cracks. Replace the belt if any of these conditions are evident.
1. Position the machine on a level surface, lower the cutting unit,
engage the parking brake, be sure the traction pedal is in neu-
tral position, the PTO lever in the OFF position, shut off the
engine and remove the key from the switch.
2. Release and unhook the latches securing the covers to the top
of the cutting unit. Remove the covers.
3. Loosen the two nuts securing the idler plate in place and
remove the old belt fromthe pulleys.
4. To install a new belt, the gear box base must be removed. To
do this, remove the four carriage bolts and locknuts holding the
gear box base.
5. Install the new belt around the gear box pulley, spindle pulleys,
Figure 19
1. Idler adjusting nut
2. Nuts (2)
3. Idler plate
21