17
4. Insert a pin punch into the mounting tube and carefully
drive out the bushings (Fig. 30).
2
2
1
m-1076
Figure 30
1.
Carrier frame mounting
tube
2.
Bushing
5. Clean the inside of the mounting tube.
6. Grease the inside and outside of the new bushings.
Note: Use a hammer and flat plate to carefully drive the
bushings into the mounting tube.
7. Inspect the castor wheel fork for wear and replace it if
necessary (Fig. 29).
8. Slide the castor wheel fork through the bushings in the
mounting tube.
9. Replace the thrust washer(s) onto the fork and secure
with the locking pin (Fig 29).
Important
The inside diameter of the bushings may
collapse slightly when installed. If the castor wheel fork
does not slide into the new bushings, ream both bushings to
an inside diameter of 1.126 in. (28.6mm).
10. Grease the fitting on the carrier frame mounting tube
using No. 2 general-purpose lithium- or molybdenum-
base grease.
Servicing the Castor Wheels
and Bearings
The castor 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 castor wheel usually
indicates a worn bearing.
1. Remove the locknut and wheel bolt that hold the castor
wheel to the castor fork (Fig. 31).
1
2
3
4
5
3
m-3986
Figure 31
1.
Locknut
2.
Wheel bolt
3.
Bushing
4.
Spanner bushing
5.
Roller bearing
2. Remove 1 bushing, then pull the spanner bushing and
the roller bearing out of the wheel hub (Fig. 31).
3. Remove the other bushing from the wheel hub and
clean any grease and dirt from the wheel hub (Fig. 31).
4. Inspect the roller bearing, bushings, spanner bushing,
and the inside of the wheel hub for wear. Replace any
defective or worn parts (Fig. 31).
5. To assemble, place 1 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 (Fig. 31).
6. Install the castor wheel into the castor fork and secure
with the wheel bolt and locknut.
7. Tighten the locknut until the spanner bushing bottoms
against the inside of the castor forks (Fig. 31).
8. Grease the fitting on the castor wheel.
Summary of Contents for 30149
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