1, interference between parts.

Possible cause: The two components interacted due to the impact or installation of other equipment.

Solution: Only through plastic repair or replacement of related parts can there be no interference between parts.

2. Loose bolts or nuts.

Possible reasons: driving on the road with poor road conditions for a long time makes the bolts loose naturally; Improper disassembly and installation will damage the bolts; Insufficient tightening torque or incorrect bolt specifications.

Solution: Tighten or replace bolts and nuts.

3. The universal joint of the transmission shaft is faulty.

Possible reasons: the dust cover is damaged or the oil leakage is not repaired in time.

Solution: Replace the universal joint of the drive shaft with a new one.

4. Abnormal sound caused by damage of each ball head, suspension and connecting bracket.

Possible causes: failure caused by loose ball head or aging and cracking of rubber gasket after long-term use.

Solution: Replace the ball head or support pad with a new one.

5. Abnormal sound of the braking system.

Possible causes: the brake pad, brake caliper or bracket are loose; Brake pads or brake discs are faulty.

Solution: Check whether the brake system is loose and whether the brake pads and discs are abnormally worn.

6. Abnormal sound of hub bearing.

It occurs at a certain speed, with a "buzzing" sound, which increases with the increase of speed.

Possible reasons: Most of them are caused by ablation of hub bearings.

Solution: Replace the hub bearing with a new bearing. It is recommended to replace both sides at the same time.