Adjusting The Caster-Pivot Bearing; Using The Clutch Shim - Toro 74901 Operator's Manual

Adjusting the Caster-pivot
Bearing
Service Interval: Every 500 hours/Yearly (whichever comes
first)
1. Disengage the blade-control switch (PTO), move the
motion-control levers to the neutral-locked position,
and set the parking brake.
2. Stop the engine, remove the key, and wait for all moving
parts to stop before leaving the operating position.
3. Remove the dust cap from caster and tighten the lock
nut (Figure 64).
4. Tighten the locknut until the spring washers are flat,
and then back off a 1/4 turn to properly set the preload
on the bearings (Figure 64).
Important: Make sure that the spring washers are
installed correctly as shown in Figure 64.
5. Install the dust cap (Figure 64).
Figure 64
1. Spring washers
2. Lock nut

Using the Clutch Shim

Some later model year units have been built with clutches that
contain a brake shim. When the clutch brake has worn to the
point where the clutch no longer engages consistently, the
shim can be removed to extend the clutch life.
3. Dust cap
1. Armature
2. Field shell
3. Rotor
4. Brake-mounting bolt
Removing the Clutch Shim
1. Stop the engine, wait for all moving parts to stop,
remove the key, engage the parking brake, and allow
the machine to cool completely before starting these
instructions.
2. Using an air compressor, blow out any debris from
under the brake pole and around the brake spacers.
3. Check the condition of the wire-harness leads,
connectors, and terminals.
Note: Clean or repair as necessary.
4. Verify that 12V is present at the clutch connector when
the PTO switch is engaged.
5. Measure the gap between the rotor and armature. If
the gap is greater than 1 mm (0.04 inch), proceed with
the following steps:
A. Loosen both brake-mounting bolts 1/2 to 1 full
turn as shown below.
Note: Do not remove the brake pole from the
field shell/armature. The brake pole has worn
to match the armature and needs to continue to
46
Figure 65
5. Brake spacer
6. Re-gap shim
7. Brake pole
Figure 66