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1. Mounting Tube
5. Grease the inside and outside of the new bushings. Use
a hammer and flat plate to carefully drive the bushings
into the pivot tubes.
6. Inspect the caster wheel fork for wear and replace if
necessary (Figure 42).
7. Slide the caster wheel fork through the bushings in the
mounting tube. Replace the spacer(s) onto the fork and
secure with the retaining ring (Figure 42).
Important: The inside diameter of the bushings
may collapse slightly when installed. If the caster
wheel fork does not slide into the new bushings,
ream both bushings to an inside diameter of 1.126
inch (29 mm).
8. Grease the fitting on the carrier frame pivot tubes using
No. 2 general purpose lithium base or molybdenum
base grease.
Servicing the Caster Wheel
and Bearings
The caster wheels rotate on a roller bearing supported by a
spanner bushing. If the bearing is kept well lubricated, wear
will be minimal. Failure to keep the bearing well lubricated
will cause rapid wear. A wobbly caster wheel usually indicates
a worn bearing.
1. Remove the locknut and wheel bolt holding the caster
wheel to the caster fork (Figure 44).
Figure 43
2. Bushing
1. Locknut
2. Cap
3. Roller Bearing
2. Remove one bushing, then pull the spanner bushing
and roller bearing out of the wheel hub (Figure 44).
3. Remove the other bushing from the wheel hub
and clean any grease and dirt from the wheel hub
(Figure 44).
4. Inspect the roller bearing, bushings, spanner bushing
and inside of the wheel hub for wear. Replace any
defective or worn parts (Figure 44).
5. To assemble, place one bushing into the wheel hub.
Grease the roller bearing and spanner bushing and slide
them into the wheel hub. Place the second bushing
into the wheel hub (Figure 44).
6. Install the caster wheel into the caster fork and secure
with the wheel bolt and locknut. Tighten the locknut
until the spanner bushing bottoms against the inside of
the caster forks (Figure 44).
7. Grease the fitting on the caster wheel.
Adjusting the Electric Clutch
Service Interval: Every 100 hours
The clutch is adjustable to ensure proper engagement and
proper braking.
1. Insert a 0.015–0.021 inch (0.381–0.533 mm) feeler
gauge through one inspection slot in the side of the
assembly. Make sure it is between the armature and
the rotor friction surfaces.
2. Tighten the lock nuts until there is slight binding on
the feeler gauge but it can be moved easily within the
air gap (Figure 45).
3. Repeat this for the remaining slots.
30
Figure 44
4. Spanner Bushing
5. Wheel
6. Bushing
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