Repack and Pre-Load Wheel Hub Bearings
The wheel bearing pre-load should be set periodically or more often if transported frequently. Raise
the tire so it can rotate and:
1. Remove the dust cap from hub.
2. Remove cotter pin from nut and spindle.
3. While turning the tire, tighten the castellated nut until there is a slight but noticeable drag on
the bearing. Do not back the nut off. Place the cotter pin in the nearest hole to secure the
nut. Replace the dust cap and gasket.
Repack the wheel hub bearings yearly by:
1. Remove the tire from the hub.
2. Remove the dust cap and gasket.
3. Remove the cotter pin and remove the castellated nut from the end of the spindle.
4. Slide the hub off the spindle taking care not to damage the seal..
5. Clean bearing cones, dust cap and nut with kerosene or other appropriate solvent.
6. Clean the inside of the hub and inspect the bearing cups and the seal. If they show
excessive wear or are damaged, replace both the cups and cones and seal. Though it is not
always necessary, it is advisable to replace the seal whenever repacking the hubs.
7. Pack the bearing cones and inside cavity of the hub with No. 2 multi-purpose lithium grease
or equivalent. Make sure no foreign material contaminates the lubricant.
8. Place the rear bearing cone into the back of the hub and press the seal into the hub. Place a
light film of grease on the seal surface and carefully slide the hub onto the spindle taking
care not to damage the seal.
9. Place the outside bearing cone over the spindle and into the hub.
10. Install the castellated nut and follow the procedure for setting the pre-load.
11. Reinstall the dust cap and tire.
Check the wheel lug nuts and wheel bearing pre-load after the next week of operation.
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