A: For the first case, change the speed of the car first. If there is a “jingle” or a clutter when starting, and a intermittent sound is emitted when the slope is reversed, it is caused by the damage of the needle bearing. We can replace it to eliminate the fault; if there is obvious impact sound during start-up or acceleration/deceleration, it is more obvious at low speed, it is caused by loose or lack of oil, and should be checked for the cause of the fault; When a metal crash sound suddenly appears, it is caused by poor fastening of the drive shaft. It can be confirmed by pushing the universal joint after parking, and then repaired or replaced.
For the second case, you can pay attention to it during driving. If there is a regular crisp sound in the off-line taxi, it is more obvious when driving at low speed, that is, the universal joint bearing is too tight; if there is continuous running Sound, and obvious with the speed of the car, that is caused by poor bearing installation or lack of oil; if the sound of the drive is disorderly and irregular, sometimes there is a metal impact sound, that is, the constant velocity arrangement of the universal joint is destroyed; When a dull continuous sound occurs and the neutral sliding sound is reinforced, it can be judged to be caused by the intermediate support bearing falling apart, and can be removed after disassembly to eliminate the fault.
It is worth noting that if the overload is operated, the drive shaft will be distorted or even broken. If it occurs on a downhill slope, it will bring danger to the driving, so the abnormal sound of the drive shaft cannot be ignored.