Car wheel hub of the repair and maintenance

Automobile wheel hub bearings how to repair and maintenance walking wheel hub bearing is car important parts. Wheel hub bearing when negative frictional resistance in the operation of lower chassis, sustain the weight of vehicles moving. If something has gone wrong with wheel hub bearing, may make up the phenomenon of noise, such as bearing heating, especially the front wheel is more apparent, easy risk direction is out of control, etc. Therefore, wheel hub bearing must stop maintenance on schedule. 1. Car wheel hub bearing inspection ( 1) Check the wheel hub bearing tightness, the first to tested the car wheel hub end of axle set, car with a car seat, mask, wood and other gear up the car safely. ( 2) Turn the tested by hand wheel for circle, can see turn smoothly, whether there are abnormal noise. If the rotation is not smooth and the friction, clarify local abnormal braking; If there is no noise, the rotation is not smooth and yet too-loosely aligned, clarify bearing local abnormal. When rendering the abnormal phenomenon should overhaul the wheel hub. On small cars, check the wheel hub bearing, the holding the top and bottom side of the tire with both hands, both hands back and forth flipping the tires, do repeated over and over again. If normal, should be no loose kuang and block thought; If shaking have apparent kuang think, should overhaul hub. ( 3) Check the brake. Usually check the wheel hub bearing, the attached check wheel brake installation, if there is oil stains, tires inside is likely to be provoked by brake wheel cylinder or brake oil pipeline leak, should be timely find out the reason, to be swept away. 2. Automobile wheel hub bearing remaining before remove the wheel hub, should be ready to wheel goes to work, the car stopped and set up a axle, in order to ensure the maintenance work of peace. ( 1) Remove the wheel shaft head of the decorative cover, dust cover; ( 2) Remove the tire nut and tire, pay attention to don't tire bolt thread bruised. If be the disc brake, should remove the brake, then used for pliers remove the locking collar or lock pin. ( 3) Use special tools to remove the wheel; ( 4) Scrape off the bearing, shaft and hub cavity old fat, smooth clean with cleaner wheel hub bearing and shaft neck and dried with a cloth, finally cloth rub-up wheel hub inner cavity. （ 5) Check the wheel hub bearing and the bearing race, found a crack, fatigue spalling and bearing roller lax wait for a phenomenon, should be a change in the bearing. If found a pit on the bearing race, also should change the bearing. （ 6) Check bearing inside diameter and journal cooperation condition, fit clearance should not be greater than zero. 10 mm measurement journal, in the vertical fluctuation two parts of the air, The place for the biggest wear parts) Measurement. If the use of fit clearance beyond rules limit, should change bearing, restore normal fit clearance. Don't allow on the shaft neck burr, pitting to reduce the gap. （ 7) After being all parts fit request, will release after a smooth bearing daub grease inside hub. （ 8) Will smooth bearing inner cavity daub grease should be pay attention to when, should be smooth fat crowded into the bearing until smooth and fat from the other side of the bearing. Within the hub cavity and shaft epicranium daub smooth a thin layer of fat, make it play the role of rust. Of wheel hub cavity smooth fat don't apply too much, otherwise it will affect the heat dissipation and brake. （ 9) Outside the hub and return to the journal bearing is installed, adjust the shaft head nut screw on with the hand, and then use according to the rules of the torsion shaft head wrench and tighten the adjusting nut. After tighten nut, should turn right or left wheel hub, see the bearing assembly condition; On the other hand, after turn the bearing and the seat right to cooperate. Bearing tightness, appropriate at this time the wheel at home and don't feel the axial clearance. （ 10) The last device in turn lock plate, a fixed nut, tire, dust cover and decorative cover, etc. （ 11) Adjust, wheel hub bearing a mileage traveled ( Around 10 km) Parking, check for dry to touch the temperature of the wheel hub, if fever, adjust the tight, for bearing should be readjusted, appropriate release bearing tightness.