How to repair and maintain auto wheel bearings?

Wheel bearings are important  parts of auto car. The hub axle is responsible for reducing the frictional resistance when the chassis is running and maintaining the normal driving of the car. If the hub bearing fails, it may cause noise, bearing heating, etc., especially the front wheel is more obvious, and it is easy to cause dangerous phenomena such as out of control. Therefore, the hub bearings must be maintained on schedule. Before disassembling the hub, you should make preparations for hub maintenance, stop the car and erect the axle to ensure the safety of maintenance operations.

 1. Remove the decorative cover and dust cover of the hub axle;

 2. Remove the tire nut and tire, taking care not to damage 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 special tools;

 4. Scrape off the old grease in the bearing, journal and hub cavity, clean the hub bearing and journal with detergent and dry it with a cloth, and 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 bearing should be replaced. If pitting is found on the bearing race, the bearing should also be replaced.

 6. Check the fit between the inner diameter of the bearing and the journal. The fit clearance should not be greater than 0.1Omm. When measuring the journal, it should be measured at the upper and lower parts of the vertical ground (the place is the largest wear part). If the fit gap exceeds the specified limit of use, the bearing should be replaced to restore the normal fit gap. Burrs and pits on the journal are not allowed to narrow the gap.

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

 8. Pay attention when applying grease to the bearing cavity. The grease should be squeezed 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 axle head cover to prevent rust. Be careful not to apply too much grease in the hub cavity, otherwise it will affect heat dissipation and braking.

 9. Install the hub and outer bearing back to the journal, screw on the adjusting nut of the shaft head by hand, and then tighten the adjusting nut according to the specified torque with the shaft head wrench. After tightening the nut, you should turn the hub a few turns left and right to see the installation of the bearing; on the other hand, make the bearing and the seat ring fit correctly by turning. At this time, the bearing tightness is appropriate, and the wheel rotates freely without feeling the axial clearance.

 10. Finally, install the lock plate, fixing nut, tire, dust cover and decorative cover in sequence.

 11. After adjusting the wheel hub bearing, drive for a certain mileage (about 10km) and stop for inspection to wipe the temperature of the wheel hub. If it gets hot, the bearing should be adjusted too tightly. It should be adjusted again and the bearing tightness should be loosened appropriately.

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