1, interference between parts, two parts affect each other due to impact or addition of other equipment. Solution: Only by reshaping, repairing or replacing related parts can there be no interference between parts.

2. The bolt or nut is loose, and the bolt is naturally loose after driving on the road with poor road conditions for a long time; Improper disassembly and installation will damage the bolts; Insufficient tightening torque or incorrect bolt specifications. Solution: Tighten or replace bolts and nuts.

3. Failure to maintain the transmission shaft universal joint in time due to failure, broken dust cover or oil leakage; Solution: Replace the new transmission shaft universal joint.

4. The damage of each ball head, suspension and connecting bracket leads to abnormal sound, and after long-term use, the ball head is loose or the rubber pad is aging and cracked, which leads to failure. Solution: Replace the ball head or support pad with a new one.

5. The abnormal sound of the hub bearing appears at a certain speed, with a "buzzing" sound, which increases with the increase of the speed. Most of them are caused by the ablation of hub bearings. Solution: Replace the hub bearing with a new bearing.