Exmark Lazer Z Mower 4500-507 - Manual (Page 43)

Maintenance
Figure 36
RH Motion Control Shown
1. Screw 3. Motion control lever
2. Cover plate
Caster Pivot Bearings
Pre-Load Adjustment
Remove dust cap from caster and tighten nyloc nut
until washers are flat and back off 1/4 of a turn
to properly set the pre-load on the bearings. If
disassembled, make sure the spring disc washers are
reinstalled as shown in Figure 37.
Figure 37
1. Spring disc washers
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.
Figure 38
1. Armature 5. Brake spacer
2. Field shell 6. Re-gap shim
3. Rotor 7. Brake pole
4. Brake mounting bolt
Removing the Shim:
1. Stop engine, wait for all moving parts to stop,
and remove key. Engage parking brake. Allow
the machine to cool completely before starting
these instructions.
2. Using a pneumatic line, blow out any debris
from under the brake pole and around the brake
spacers.
Figure 39
3. Check the condition of the wire harness leads,
connectors, and terminals. Clean or repair as
necessary.
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