Hub bearings is the important car walking components. Hub bearings for the lower chassis in the operation of friction, maintain normal car driving on them. If a wheel bearing fault, may cause the noise, bearing the phenomenon such as fever, especially the front wheel is more apparent, easy to cause the direction out of control, and dangerous phenomenon. Therefore, wheel hub bearing must periodically do check and maintain.

A, wheel hub bearing examination

1. Check the wheel bearing the degree, first the car wheel hub of the wheel for one client to build up, with a car stool, their car wood tools to car safely set. Then by hand turn the wheel of client few laps, see whether smooth rotation, whether to have not normal noise. If turn not smooth and sound of friction that braking parts do not normal; If there is no noise, turn not smooth and ShiJinShiSong, explain bearing part not normal. If appear afore-mentioned not normal phenomenon, wheel hub bearing is checked.

2. The small car wheel bearing check, first with both hands hold up and down the side of tyre, and then throw the back tyre, repeat it many times. If normal word, show no loose desert and block phenomenon; If swinging the feeling of desert has obvious pine, the need for overhauling the wheel hub.

3. For brake aspects of the check, used to check the wheel bearings, also attached to check the wheel brake. If the tyres medial oil stains, probably braking points pump or brake oil caused by the oil leakage. This time it shall timely find out reason, given to rule out.

Second, wheel hub bearing of maintenance

When removing the wheel before, should do well in the preparation of the wheel hub maintenance. First the bus is stationary and build up axle, to ensure the safety of the maintenance activities. Then dismantle the wheel shaft head adornment cover, dust-proof covers; To dismantle the tire nut and tires. But note that, don't touch hurt the thread of tyres bolts. For disc brakes, should first dismantling the brakes, then used to clamp dismantling the lock circle or latch.

Remove the wheel hub, special tools and application. First shave to bearing, shaft neck and hub in the cavity old grease, use cleaner hub bearings and shaft neck and dried with a cloth, and finally cloth rub-up wheel internal cavity. To check and wheel bearing the self-contained circle, revealed a crack, flake fatigue and bearing roller loose wait for a phenomenon, should be replaced bearing. In addition, the odds that circles on the bearing that is pitted, also need to replace bearing.

Check the bearing diameter and the fitting clearance shaft neck should be no more than 0.10 mm measure shaft neck, should be in perpendicular to the ground and the two parts measurement. If the use of more than the required with clearance limit, should be replaced bearing, make back to normal fitting clearance. Don't allow the shaft on the neck burr, hemp dot to narrow the gap.

For all the parts can meet the requirements, be in bearing daub after grease on the wheel hub.

Will the inner cavity bearing grease daub should be paid attention to when, should grease is packed into bearings inside from bearing grease until the other side of the come out so far. The wheel and axle cavity in TouGai daub is thin grease, make a rust role. Note the wheel hub in the cavity don't apply too much grease, otherwise, it will affect heat and braking.

Will the hub and put back to the shaft bearing neck, with the hand will adjust the nuts screw in shaft head, then use the shaft head according to regulations on torque wrench nut adjustment. Tighten the nut, should turn right or left wheel several times, see bearing installations; On the other hand, through the rotation make bearings and a circle with correct. At this time the degree appropriate bearing, wheel rotation free feel not the axial clearance.

Finally in turn lock plate installation, fixed nut, tires, dust-proof covers and decorative covers spare parts.
Wheel bearing adjustment, driving a mileage, stop for inspection, used in the temperature of the wheels touched swab, if the fever, for bearing have adjusted the tight be caused by, should readjust, appropriate relax bearing the degree.
 



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