Lubricating The Caster-Wheel Hubs - Toro Z Master Professional 5000 Series Operator's Manual

Lubricating the
Caster-Wheel Hubs
Service Interval: Yearly
1. Shut off the engine, wait for all moving parts to
stop, remove the key, and engage the parking
brake.
Figure 47
1. Seal guard
2. Raise the mower for access.
3. Remove the caster wheel from the caster forks.
4. Remove the seal guards from the wheel hub.
5. Remove a spacer nut from the axle assembly in
the caster wheel.
Note:
Thread-locking adhesive has been
applied to lock the spacer nuts to the axle.
6. Remove the axle (with the other spacer nut still
assembled to it) from the wheel assembly.
7. Pry out seals and inspect bearings for wear or
damage and replace if necessary.
8. Pack the bearings with a general-purpose
grease.
9. Insert 1 bearing and 1 new seal into the wheel.
Note:
Replace the seals.
10. 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.
11. 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
12. With the open end of the wheel facing up, fill
the area inside the wheel around the axle full of
general-purpose grease.
13. Insert the second bearing and new seal into the
wheel.
14. Apply a thread-locking adhesive to the second
spacer nut, and thread it onto the axle with the
wrench flats facing outward.
15. 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 that the axle does not extend
beyond either nut.
16. Install the seal guards over the wheel hub, and
insert the wheel into the caster fork.
17. 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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