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[KM bearing] Hub bearing maintenance, have you noticed

Hub bearing is an important moving part of automobile. Hub bearings are responsible for reducing the friction resistance of chassis operation and maintaining the normal running of the car. If the hub bearing is out of order, it may cause noise, bearing heating and other phenomena, especially the front wheel is more obvious, easy to lead to direction loss control and other dangerous phenomena. Therefore, hub bearings must be maintained on schedule.
1. Hub bearing inspection
(1) When checking the tightness of the hub bearing, first set up the axle of the wheel at one end of the hub, and then set up the car safely with tools such as supporting stool and covering wood.
(2) Turn the tested wheel several times by hand to see if the rotation is smooth and if there is abnormal noise. If the rotation is not stable and there is friction sound, the braking part is not normal. If there is no noise, the rotation is uneven and loose, the bearing part is abnormal. The hub should be disassembled when the above abnormal phenomenon occurs. For small cars, when checking hub bearings, hold the top and bottom sides of the tire with both hands, pull the tire back and forth with both hands, and repeat many times. If normal, there should be no feeling of looseness or blockage; If the swing feels distinctly loose, remove the hub.
(3) Check on braking. Usually in the inspection of the hub bearing, accompanied by the inspection of the wheel brake device, if there is an oil mark inside the tire, it is likely to be caused by the brake pump or brake pipe oil leakage, should be promptly found out the cause, to be eliminated.
Harbin bearing
2. Maintenance of hub bearings
Before removing the hub, the hub should be prepared for maintenance, and the car should be stopped and set up the bridge to ensure the safety of maintenance.
(1) Remove the decorative cover and dustproof cover of the hub shaft head;
(2) Remove the tire nut and tire, and be careful not to damage the thread of the tire bolt. If it is a disc brake, the brake should be removed, and then used for clamp to remove the lock ring or lock pin.
(3) Remove the hub with a special tool;
(4) Scrape off the old grease in the bearing, journal and hub chamber, clean hub bearing and hub journal with cleaning agent and dry them with cloth, and finally wipe off the hub inner chamber with cloth.
(5) The hub bearing and bearing seat ring shall be inspected and the bearing shall be replaced if cracks, fatigue spalling and loose bearing roller are found. Bearings should also be replaced if pitting is found on the bearing ring.
(6) Check the fit between bearing inner diameter and journal. The fit clearance shall not be greater than 0.1Omm. When measuring journal, it shall be measured at the upper and lower parts of the vertical ground (where is the most worn part). If the fit clearance exceeds the specified use limit, the bearing shall be replaced to restore the normal fit clearance. {HotTag} Burrs and pitting on the journal are not allowed to narrow the gap.
(7) After all parts meet the requirements, grease the inner bearing and put it into the hub.
(8) When applying grease to the inner cavity of the bearing, it shall be noted that the grease shall be squeezed into the bearing until it emerges from the other side of the bearing. Apply a thin layer of grease to the hub cavity and the shaft 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 the external bearing back on the journal, screw on the adjusting nut of the shaft head 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 several times to see how the bearing is installed. On the other hand, the bearing and seat ring can be correctly matched by rotation. At this point bearing tightness is appropriate, the wheel free rotation without feeling the axial clearance.
(10) Finally, install the lock piece, fixing nut, tire, dust cover and decorative cover in turn.
(11) After the hub bearing has been adjusted, drive a certain mileage (about 1Okm), and check the parking space to swab the hub's temperature. If there is heat, it is caused by too tight bearing adjustment, and the bearing tightness should be adjusted again to relax properly.