How to maintain car wheel bearings?

Before disassembling the hub, prepare the wheel hub for maintenance, stop the car and set up the axle to ensure the safety of the maintenance work.

(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, and find that 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 matching between the inner diameter of the bearing and the journal. The matching clearance should be no more than 0.1Omm. When measuring the journal, it should be measured at the upper and lower parts of the vertical ground (the largest wear part at this place). If the fit clearance exceeds the specified service limit, the bearing should be replaced to restore the normal fit clearance. It is not allowed to burr and pock on the journal to narrow the gap.

(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 bearing inner cavity, 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. Be careful not to apply too much grease in the hub cavity, otherwise it will affect heat dissipation and braking.

(9) Put the hub and outer bearing back on the journal, screw the shaft adjusting 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.