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Figure 28
1. Caster fork
2. Bolt
3. Seal guard
6. Remove one of the spacer nuts (with wrench
flats) from the axle (Figure 30).
Note: Thread locking adhesive has been
applied to the spacer nuts.
7. Remove the axle without removing the
opposite spacer nut (Figure 30).
8. Remove the seals and inspect the bearings
for wear or damage. Replace the bearings if
needed.
9. Pack the bearings with general purpose grease.
10. Insert the bearing and a new seal into the
wheel (Figure 30).
Note: Do not install the nut all the way onto
the axle.
11. If both spacer nuts were removed from the
axle, apply thread locking adhesive to the
spacer nut. Install the spacer nuts onto the axle
leaving an 1/8 inch (3mm) of the nut past the
axle (Figure 29).
4. Caster wheel
5. Nut
Figure 29
1. 1/8 inch (3 mm) of the nut past the axle
12. Install the assembled nut and axle into the
wheel on the side with the bearing and a new
seal (Figure 30).
13. Place the wheel with the open end facing
up and fill the area inside the wheel with
multi-purpose grease.
14. Install the second bearing and a new seal into
the wheel (Figure 30).
15. Apply thread locking adhesive to the second
spacer nut and install it onto the axle with the
wrench flats facing outward.
16. Torque the spacer nut to 75-80 in-lb (8-9 N⋅m)
then loosen it and torque it to 20–25 in-lb (2-3
N⋅m). Make sure the axle does not extend past
either nut (Figure 29).
17. Install the seal guards over the wheel hubs and
insert the wheel into the caster fork (Figure 28).
18. Install the caster bolt and tighten the nut
(Figure 28).
Important: Check the bearing
adjustment often to prevent seal and
bearing damage. Spin the caster tire. The
tire should not spin freely more than 1 to 2
revolutions or have any side-to-side play
between the caster fork. If the wheel spins
freely, adjust the torque on the spacer nut
until there is a slight amount of drag.
28
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