How to repair and maintain the wheel hub bearing is an important part of the automobile. The hub bearing is responsible for reducing the friction resistance of the chassis during operation and maintaining the normal driving of the vehicle. Repair and Maintenance of Automobile Hub
If the hub bearing fails, it may cause noise and bearing heating, especially the front wheel, which is easy to lead to dangerous phenomena such as out of control. Therefore, the hub bearing must be maintained on schedule.Repair and Maintenance of Automobile Hub
Repair and Maintenance of Automobile Hub
When checking the tightness of the wheel hub bearing, first set up the axle of the wheel at one end of the wheel hub of the vehicle to be inspected, and put the vehicle on the ground with tools such as supporting stool and cover wood.Repair and Maintenance of Automobile Hub
Rotate the tested wheel by hand for several turns to see whether the rotation is stable and whether there is abnormal noise. If the rotation is not smooth and there is friction sound, the braking part is abnormal;
If there is no noise, the rotation is unstable and tight and loose, it indicates that the bearing part is abnormal. When the above abnormal phenomena occur, the hub should be disassembled and inspected.Repair and Maintenance of Automobile Hub
For small cars, when checking the wheel hub bearing, hold the upper and lower sides of the tire with both hands, pull the tire back and forth with both hands, and repeat for many times.
If normal, there should be no feeling of looseness and block; If there is obvious looseness in the swing, dismantle and inspect the hub.Repair and Maintenance of Automobile Hub
Inspection of braking. Usually, when checking the wheel hub bearing, check the wheel braking device. If there is oil stain on the inner side of the tire, it is likely to be caused by oil leakage of the brake wheel cylinder or brake oil pipe. Find out the cause in time and eliminate it.Repair and Maintenance of Automobile Hub
Maintenance of automobile wheel hub bearing before removing the wheel hub, make preparations for wheel hub maintenance, stop the vehicle stably and set up the axle to ensure the safety of maintenance operation.Repair and Maintenance of Automobile Hub
Remove the decorative cover and dust cover of the hub shaft head;
Remove the tire nut and tire, and be careful not to damage the thread of the tire bolt. If it is a disc brake, remove the brake and then use it to remove the lock ring or lock pin.
Remove the hub with special tools;Scrape off the old grease in the bearing, journal and hub cavity, clean the hub bearing and journal with cleaning agent and dry them with cloth, and then clean the hub cavity with cloth.Repair and Maintenance of Automobile Hub
Check the hub bearing and bearing race. If cracks, fatigue peeling and loose bearing rollers are found, replace the bearing. If pitting is found on the bearing race, the bearing should also be replaced.Repair and Maintenance of Automobile Hub
Check the fit between the inner diameter of the bearing and the journal. The fit clearance shall not be greater than 0.10mm. When measuring the journal, it shall be measured at the upper and lower parts of the vertical ground (this is the wear part of the bearing). If the fit clearance exceeds the specified service limit, replace the bearing to restore the normal fit clearance. It is not allowed to reduce the clearance by burring and pitting on the journal.Repair and Maintenance of Automobile Hub
After all parts meet the requirements, apply grease to the inner bearing and put it into the hub.Repair and Maintenance of Automobile Hub
When applying grease to the bearing cavity, pay attention to squeeze the grease into the bearing until the grease comes out from the other side of the bearing. Apply a thin layer of grease in the hub cavity and the shaft head cover to prevent rust. Pay attention not to apply too much grease in the hub cavity, otherwise it will affect heat dissipation and braking.Repair and Maintenance of Automobile Hub
Install the hub and outer bearing back on the journal, screw the shaft head adjusting nut by hand, and then tighten the adjusting nut with the shaft head wrench according to the specified torque. After tightening the nut, turn the hub left and right for several turns to see the installation of the bearing;
On the other hand, rotate to make the bearing and race fit correctly. At this time, the bearing tightness is appropriate, and the wheel rotates freely without axial clearance.Repair and Maintenance of Automobile Hub
After installation, install the locking plate, fixing nut, tire, dust cover, decorative cover and other parts in turn.Repair and Maintenance of Automobile Hub
After the hub bearing is adjusted, drive for a certain mileage (about 10km) and stop for inspection. It is used to wipe the temperature of the hub. If the heating is caused by too tight adjustment of the bearing, it should be readjusted and the bearing tightness should be prope“rly relaxed.Repair and Maintenance of Automobile Hub
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