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Lubricating the
Caster-Wheel Hubs
Service Interval: Yearly
1.
Engage the parking brake, shut off the engine,
wait for all moving parts to stop, and remove
the key.
Figure 47
1. Seal guard
2.
Raise the front of the machine up, and support it
with jack stands (or equivalent support) just high
enough to allow the front wheels to turn freely.
3.
Remove the caster wheel from the caster forks.
4.
Remove the seal guards from the wheel hub.
5.
Remove 1 of the spacer nuts from the axle
assembly in the caster wheel. Note that
thread-locking adhesive has been applied to
lock the spacer nuts to the axle. Remove the
axle (with the other spacer nut still assembled to
it) from the wheel assembly.
6.
Pry out seals, and inspect the bearings for wear
or damage and replace them if necessary.
7.
Pack the bearings with a general-purpose
grease.
8.
Insert one bearing, one new seal into the wheel.
Note:
The seals must be replaced.
9.
If the axle assembly has had both spacer
nuts removed (or broken loose), apply a
thread-locking adhesive to one spacer nut and
thread it onto the axle with the wrench flats
facing outward. Do not thread the spacer nut
all the way onto the end of the axle. Leave
approximately 3 mm (1/8 inch) from the outer
surface of the spacer nut to the end of the axle
inside the nut.
10.
Insert the assembled nut and axle into the wheel
on the side of the wheel with the new seal and
bearing.
g006115
2. Spacer nut with wrench
flats
11.
With the open end of the wheel facing up, fill
the area inside the wheel around the axle full of
general-purpose grease.
12.
Insert the second bearing and a new seal into
the wheel.
13.
Apply a thread-locking adhesive to the second
spacer nut and thread it onto the axle with the
wrench flats facing outward.
14.
Torque the nut to 8 to 9 N∙m (75 to 80 in-lb),
loosen it, then torque it to 2 to 3 N∙m (20 to 25
in-lb). Make sure that the axle does not extend
beyond either nut.
15.
Install the seal guards over the wheel hub and
insert the wheel into the caster fork. Install the
caster bolt and tighten the nut fully.
16.
Remove the jack stands.
Important:
To prevent seal and bearing damage,
check the bearing adjustment often. Spin the
caster wheel. The wheel should not spin freely
(more than 1 or 2 revolutions) or have any side
play. If the wheel spins freely, adjust the torque on
spacer nut until there is a slight amount of drag.
Apply thread-locking adhesive.
38
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