In the process of maintenance, it is often found that some cars have a large driving noise, check that the tires are free from abnormal wear, and there is no obvious abnormal noise when the wheels turn on the lifting machine.
This phenomenon is often caused by abnormal damage of hub bearing, so called abnormal is the damage of bearing caused by installation. Car front wheel bearings are generally double row ball bearing, if you use the hammer knock when install the bearing installation, or when the bearing is installed into the bearing installation, by means of the pressure bearing inner ring can cause side bearing raceway damage.
There is noise when the car is moving, and when the wheels are off the ground there is no obvious noise because there is a better side of the raceway. Correct installation operation is the key to long life of bearing.