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Due to the influence of the automobile driving on the complex road, the transmission shaft often transmits torque when its angle and length are constantly changing. Therefore, the transmission shaft dynamic imbalance, the looseness and noise of the universal joint and the intermediate support often occur.

Fault 1: there is a crash sound when the car starts, and there is always an abnormal noise during driving. The phenomenon is that there is a crash sound when the car starts; During heavy driving, when the vehicle speed changes or the high gear is driven at a low speed, there is also a crash sound, which is almost constant during the whole driving process.

Fault 2: there is no abnormal noise when starting, but there is abnormal noise when driving. The phenomenon is that although the car makes no abnormal noise when starting, it makes abnormal noise when accelerating, and the noise is obvious when sliding out of gear.

Fault 3: it makes periodic noise during driving. The higher the speed, the greater the noise. The phenomenon is that when the universal joint and sliding fork are in good technical condition, the car makes periodic noise during driving. The higher the speed, the louder the sound, even accompanied by body vibration. The hands holding the steering wheel feel numb.

Fault 4: under different working conditions, the transmission shaft makes a "noise" or "quack, quack". The phenomenon is that when the car starts and changes the speed suddenly, the transmission device makes a "noise"; When the car is moving slowly, it makes a "quack, quack" sound.

Fault 5: continuous "purring" sound occurs during operation. The phenomenon is that there is a continuous "whine" sound during the operation of the car. The higher the speed, the greater the sound.

Fault 6: there is abnormal noise during driving, accompanied by body vibration. The phenomenon is that there will be abnormal noise when exceeding the medium speed. The higher the speed is, the louder the noise will be. When reaching a certain speed, the car body vibrates. At this time, if you immediately shift out of gear and slide, the vibration will be stronger. When the speed drops to medium speed, the vibration will decrease slightly, but the abnormal noise of the transmission shaft still exists.