What are the maintenance methods for automotive wheel bearings?

Car wheel bearing maintenance process is:

1. Remove the decorative cover and dust cover of the hub shaft head;

2. Remove the tire nut and tire, taking care not to hurt the thread of the tire bolt. If it is a disc brake, remove the brake and use it to remove the lock ring or lock pin.

3. Remove the hub with a special tool;

4. Scrape the old grease in the bearing, journal and hub cavity, clean the hub bearing and journal with a cleaning agent and wipe dry with a cloth. Finally, wipe the inner cavity of the hub with a cloth.

5. Check the hub bearing and the bearing race. If there are cracks, fatigue peeling and loose bearing rollers, the bearings should be replaced. If there is a pitting on the bearing race, the bearing should also be replaced.

6. Check the fit of the inner diameter of the bearing and the journal. The clearance should be no more than 0.1Omm. When measuring the journal, it should be measured in the upper and lower parts of the vertical ground (the largest wear part).

7. After all the parts meet the requirements, apply the grease to the inner bearing and put it in the wheel hub.

8. When applying grease to the inner cavity of the bearing, be careful to squeeze the grease into the bearing until the grease emerges from the other side of the bearing. Apply a thin layer of grease to the hub cavity and the shaft cap to prevent rust.

9. Put the hub and outer bearing back on the journal, screw the shaft adjustment nut by hand, and then tighten the adjusting nut with the shaft wrench according to the specified torque. After tightening the nut, turn the hub a few turns to see if the bearing is installed. On the other hand, the bearing and the race are properly matched by rotation.

10. Finally, install the locking piece, fixing nut, tire, dust cover and decorative cover.
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