Lubricating The Caster-Wheel Hubs - Toro 74141 Operator's Manual

Lubricating the Caster-Wheel
Hubs
Service Interval: Yearly
1. Stop the engine, wait for all moving parts to stop,
remove the key, and 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: Thread-locking adhesive has been applied to
lock the spacer nuts to the axle.
5. Remove the axle (with the other spacer nut still
assembled to it) from the wheel assembly.
6. Pry out seals and inspect bearings for wear or damage
and replace if necessary.
7. Pack the bearings with a general-purpose grease.
8. Insert 1 bearing and 1 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 1
spacer nut, and thread it onto the axle with the wrench
flats facing outward.
Note: Do not thread the spacer nut all of 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.
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 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.
Figure 36
2. Spacer nut with wrench
flats
14. Torque the nut to 8 to 9 N-m (75 to 80 in-lb), loosen,
then torque to 2 to 3 N-m (20 to 25 in-lb).
Note: Make sure axle does not extend beyond either
nut.
15. Install the seal guards over the wheel hub, and insert
wheel into the caster fork.
16. Install the caster bolt and tighten the nut fully.
Important: To prevent seal and bearing damage, check
the bearing adjustment often. Spin the caster tire. The
tire should not spin freely (more than 1 or 2 revolutions)
or have any side play. If the wheel spins freely, adjust the
torque on the spacer nut until there is a slight amount of
drag. Apply another layer of thread-locking adhesive.
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