Exmark 4500-501 Rev A Caster Pivot Bearings Pre-Load Adjustment, Motion Control Damper Adjustment

Maintenance

wheel must stop turning or slightly creep in reverse (Figure 22).

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 washers are reinstalled as shown in Figure 24.

Figure 22

Left-Hand Side of Unit

1.Turn LH tracking adjustment knob. (Do Not loosen any nuts on LH side)

10.Shut off unit. Remove jumper wire from wire harness connector and plug connector into seat switch.

Motion Control Damper

Adjustment

Figure 24

The top damper mounting bolt can be adjusted to obtain a more desired motion control lever resistance. See Figure 23 for mounting options.

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 23

1.Motion control bracket

2.Least resistance (softest feel)

3.Medium resistance (medium feel)

4.Most resistance (firmest feel)

5.Torque nyloc nut to 200 in-lb (16.7 ft-lb). Bolt must protrude past end of nyloc nut after torque.

6.Damper

7.Damper must move freely on bolt.

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