The wheel bearings are walking parts car. Wheel bearing bears reduce the frictional resistance of the chassis operation, maintain a normal car driving task. If the wheel bearing out of the failure, may cause the phenomenon of noise, bearing fever, especially the front wheel is more obvious, easily lead to the direction out of control, and other dangerous phenomenon. Therefore, the wheel bearings must be scheduled for maintenance.
Check a wheel bearing
(1) Check the wheel bearing tightness, first one end of the car inspected wheel axle of the wheel set up, support vehicles stool cover car wood utensils to car safety to frame.
(2) hand rotation subjects the wheel a few laps to see if the rotation is stable, whether there is abnormal noise. If the rotation is not smooth and the friction sound, indicating that the brake part; If there is no noise, the rotation is not smooth and sometimes intensifying, indicating that the bearing part. These irregularities should be overhauled to the wheels.
For a small car, check the wheel bearings, with both hands to hold the tire up and down side, his hands pulled the tire back and forth, repeat several times. If it is normal, to should is no Songkuang and block; if swing obviously Songkuang feeling seized wheel hub should be demolition.
(3) of the brake check. Usually check the wheel bearings, with the check the wheel brake, tire medial traces of oil, is likely to be the brake wheel cylinder or brake lines oil spill caused by the timely identification of reasons, be excluded.
2 wheel bearing maintenance
Before the demolition of wheels should do the preparatory work of the maintenance of the wheels, a parked car and set up the axle, to ensure the safety of maintenance operations.
(1) remove the wheel shaft head of the decorative cover, dust cover;
(2) Remove the tire nuts and tires, be careful not to bruise the tire bolt threads. If the disc brakes, remove the brake, and then used pliers to remove the locking ring or locking pin.
(3) with special tools to remove the wheels;
(4) scrape the bearings, journal and wheel hub cavity of the old grease, wheel bearing and journal and dried with a cloth with cleaning agent, and finally with a cloth to wipe the wheel cavity.
(5) Check wheel bearings and the bearing ring, cracks, fatigue spalling and loose bearing roller phenomenon, should replace the bearings. If it is found that the pitting on the bearing ring should also replace the bearings.
(6) Check the bearing diameter and journal cope with the situation, with the gap should not be greater than 0.1Omm measuring journal, should be perpendicular to the ground in the upper and lower parts (there is the greatest wear and tear parts) measurements. When combined with the clearance exceeds the specified usage limits, replacement of bearings, so as to restore normal with the gap. Burrs, pitting is not allowed to play in the journal on to narrow the gap.
(7) Subject to all parts meet the requirements within the bearing smear grease put in the hub of the people round.
(8) the bearing cavity smear grease when the grease should be squeezed into the bearing until grease from the bearing on the other side emerge to date. Smear a thin layer of grease in the cavity of the wheel and shaft bonnet to make it play a role in rust-proof. Note the wheel cavity grease do not smear too much, otherwise it will affect the cooling and braking.
(9) wheels and outside bearings mounted back to the journal on the hand axis head adjustment nut, and then the shaft head wrench required torque tighten the adjusting nut. Turn the wheel a few times to tighten the nut should be around to see the bearing installation; the other hand, by turning with the correct bearing and seat. The bearing tightness is appropriate, the wheel free to rotate and not feel the axial clearance.
(10) in order to install the locking plate, nut, tires, dust cover and decorative cover parts.
(11) wheel bearing adjustment, running for some miles (1Okm so), stop checks, used to wipe the touch wheel temperature if fever, bearing adjustment too tight due to re-adjust, relax properly bearing tightness.



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