20
Servicing the Front Bushings
in the Castor Arms
The castor arms have bushings pressed into the top and
bottom of the tube, and after many hours of operation, the
bushings will wear. To check the bushings, move the castor
fork back and forth and from side to side. If the castor
spindle is loose inside the bushings, the bushings are worn
and must be replaced.
1. Raise the cutting unit so that the wheels are off of the
floor and block it so it cannot accidentally fall.
2. Remove the tensioning cap, spacer(s), and thrust washer
from the top of the castor spindle.
3. Pull the castor spindle out of the mounting tube. Allow
the thrust washer and spacer(s) to remain on the bottom
of the spindle.
4. Insert a pin punch into the top or bottom of the
mounting tube and drive the bushing out of the tube
(Fig. 24). Also drive the other bushing out of the tube.
Clean the inside of the tubes to remove dirt.
1
2
Figure 24
1.
Front castor arm tube
2.
Bushings
5. Apply grease to the inside and outside of the new
bushings. Using a hammer and flat plate, drive the
bushings into the mounting tube.
6. Inspect the castor spindle for wear and replace it if it is
damaged.
7. Push the castor spindle through the bushings and
mounting tube. Slide the thrust washer and spacer(s)
onto the spindle. Install the tensioning cap on the castor
spindle to retain all parts in place.
Servicing the Castor Wheels
and Bearings
The castor wheel rotates on a high-quality roller bearing
and is supported by a spanner bushing. Even after many
hours of use, provided that the bearing was kept well
lubricated, the bearing wear will be minimal. However,
failure to keep the bearing lubricated will cause rapid wear.
A wobbly castor wheel usually indicates a worn bearing.
1. Remove the locknut from the capscrew holding the
castor wheel assembly between the castor fork
(Fig. 25). Grasp the castor wheel and slide the capscrew
out of the fork.
2. Pull the spanner bushing out of the wheel hub (Fig. 25).
3. Remove the bushing from the wheel hub and allow the
bearing to fall out (Fig. 25). Remove the bushing from
the opposite side of the wheel hub.
4. Check the bearing, spanner, and inside of the wheel hub
for wear. Replace damaged parts.
5. To assemble the castor wheel, push the bushing into the
wheel hub. Slide the bearing into the wheel hub. Push
the other bushing into the open end of the wheel hub to
captivate the bearing inside the wheel hub.
6. Carefully slide the spanner through the bushings and the
wheel hub (Fig. 25).
7. Install the castor wheel assembly between the castor
fork and secure it in place with the capscrew, washers,
and locknut.
8. Lubricate the castor wheel bearing through the grease
fitting, using No. 2 general purpose lithium base grease.
1
2
3
4
5
6
6
Figure 25
1.
Castor wheel
2.
Capscrew and locknut
3.
Bushing (2)
4.
Spanner bushing
5.
Roller bearing
6.
Washer (2)
Summary of Contents for 30716
Page 23: ...23 Troubleshooting 85 To 110...
