Toro 74549 Operator's Manual page 31

1. Stop the engine, wait for all moving parts to stop, and
remove the key. Engage the parking brake.
1. Seal guard
2. Remove the caster wheel from the caster forks.
3. Remove the seal guards from the wheel hub.
4. Remove one 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.
5. Pry out seals, and inspect bearings for wear or damage
and replace if necessary.
6. Pack the bearings with a general-purpose grease.
7. Insert one bearing, one new seal into the wheel.
Note: The seals must be replaced.
8. If the axle assembly has had both spacer nuts removed
(or broken loose), apply a thread locking adhesive
to one spacer nut and thread onto the axle with the
wrench flats facing outward. Do Not thread spacer
nut all of the way onto the end of the axle. Leave
approximately 1/8 inch (3 mm) from the outer surface
of the spacer nut to the end of the axle inside the nut.
9. Insert the assembled nut and axle into the wheel on the
side of the wheel with the new seal and bearing.
10. With the open end of the wheel facing up, fill the area
inside the wheel around the axle full of general-purpose
grease.
11. Insert the second bearing and new seal into the wheel.
12. Apply a thread locking adhesive to the 2nd spacer nut
and thread onto the axle with the wrench flats facing
outward.
13. Torque the nut to 75-80 in-lb (8-9 N-m), loosen, then
re-torque to 20-25 in-lb (2-3 N-m). Make sure axle
does not extend beyond either nut.
14. Reinstall the seal guards over the wheel hub and insert
wheel into caster fork. Reinstall caster bolt and tighten
nut fully.
Important: To prevent seal and bearing damage, check
the bearing adjustment often. Spin the caster tire. The
Figure 41
2. Spacer nut with wrench
flats
tire should not spin freely (more than 1 or 2 revolutions)
or have any side play. If the wheel spins freely, adjust
torque on spacer nut until there is a slight amount of
drag. Reapply thread locking adhesive.
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