Servicing The Castor Wheels And Bearings; Replacing Push Arm Bushings - Toro 78478 Operator's Manual

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Figure 40
1. Grease fitting
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 holding the castor
wheel to the castor fork (Fig. 41).
2. Remove the washer and bushing, then pull the spanner
bushing and roller bearing out of the wheel hub (Fig.
41).
3. Remove the other bushing from the wheel hub and
clean any grease and dirt from the wheel hub (Fig. 41).
4. Inspect the roller bearing, bushings, spanner bushing
and inside of the wheel hub for wear. Replace any
defective or worn parts (Fig. 41).
5. To assemble, place one (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. 41).
6. Install the castor wheel into the castor fork and secure
with the wheel bolt and locknut. Tighten the locknut
until the spanner bushing bottoms against the inside of
the castor forks (Fig. 41).
7. Grease the fitting on the castor wheel using No. 2
general purpose lithium base or molybdenum base
grease.
2. Bushing
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6
Figure 41
1. Locknut
2. Wheel Bolt
3. Washer
4. Bushing

Replacing Push Arm Bushings

The push arms have pressed in bushings on the end
mounted to the traction unit. To check the bushings, move
the push arms side-to-side and examine for wear. If a push
arm is loose, the bushings are worn and must be replaced.
1. Remove the mower: refer to Removing the Mower in
the Installation section.
2. Inspect the pivot pin assembly for wear and replace if
necessary.
3. Remove the retaining ring and flat washer securing the
push arm to the mower (Fig. 42).
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Figure 42
1. Pin
2. Push arm
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4
3
5. Spanner Bushing
6. Roller Bearing
7. Grease fitting
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3. Flat washer 1-1/2 in.
(38 mm)
4. Retaining ring