How to repair and maintain automobile bearings
Automobile bearings are important parts of the car. Automobile bearings are responsible for reducing the friction when the chassis running, to maintain the normal driving of the heavy car. If the wheel hub bearing a failure, may cause noise, bearing heat and other phenomena, especially the front wheel is more obvious, easily lead to the direction of out of control and other dangerous phenomena. Therefore, the hub bearing must be maintained on schedule.
Turn the wheel by hand to see if the rotation is smooth, whether there is abnormal noise. If the rotation is not smooth and there is friction, indicating that the brake part is not normal; if there is no noise, rotation is not smooth and tight when the loose, indicating that the bearing part is not normal. The wheel should be dismantled when the above anomalies occur. For small cars, check the wheel bearings, with both hands to hold the upper and lower tires, hands back and forth to pull the tires, repeat many times. If normal, should not be loose and block the feeling; if the swing has a clear sense of loosening, should dismantle the wheel.
Brake inspection. Usually in the inspection of the wheel bearing, with inspection wheel brake device, if the tire inside the oil traces, is likely to brake cylinder or brake oil pipe caused by leakage, should promptly identify the reasons to be excluded.
Remove the tire nuts and tires, taking care not to touch the threads of the tire bolts. If it is a disc brake, you should remove the brake, and then use the clamp to remove the lock or lock pin. Remove the wheels with special tools. Scrap the bearing, the journal and the old grease in the hub cavity, clean the hub bearing and journal with a cleaning agent and dry with a cloth, and finally wipe the wheel cavity with a cloth. Check the wheel bearings and bearing race, found cracks, fatigue peeling and loose roller bearings and other phenomena, should replace the bearings. If you find the bearing seat on the pitting, should also replace the bearing.
Check the bearing diameter and the journal with the situation, with the gap should not be greater than 0.10mm When measuring the journal, should be in the vertical ground of the upper and lower parts (where the largest wear parts) measurement. If the clearance exceeds the specified limits, the bearings should be replaced to return to the normal clearance. Do not allow burrs on the journal to increase the gap. Until all parts meet the requirements, the internal bearing smear grease and then put into the hub. When applying grease to the bearing cavity, care should be taken to squeeze the grease into the bearing until the grease comes from the other side of the bearing. In the hub cavity and the shaft head cover a thin layer of grease, so that play the role of rust. Note that the grease inside the hub cavity should not be smeared too much, otherwise it will affect the heat and braking. Install the hub and outer bearing back to the journal, screw the shaft adjustment nut by hand, and tighten the adjustment nut with the torque of the shaft wrench. Tighten the nut, you should turn around the hub a few laps to see the bearing installation; the other hand, by rotating the bearing and the seat with the correct. At this time the appropriate tightness of the bearing, the wheel free to rotate and feel no axial clearance. Finally, install the lock, fixed nut, tire, dust cover and decorative cover and other parts.
After adjusting the wheel hub, travel for a mileage (10km or so), stop the inspection, for the temperature of the wheel hub, if the heat, for the bearing adjustment is too tight, should be re-adjusted, the appropriate relaxation bearing tightness