Tighten the front wheel of the car with mats, use a jack to lift the middle and rear drive axles on one side of the car; start the engine, put it in high gear, and observe the vibration of the drive shaft.During the inspection, notice that when the speed drops, if the shimmy increases significantly, it indicates that the drive shaft is bent or the flange is skewed.

　　The bending of the transmission shaft is the bending of the shaft tube, most of which are caused by the overload of the car.Due to overloading and overhanging of coal-carrying vehicles, more failures occurred due to bending and breaking of drive shafts.If some trucks and trailers transport more than 60 tons of coal, the drive shaft is seriously damaged due to overloading and overhanging.Although the intermediate support of the transmission shaft was strengthened and the strength of the flange fork was strengthened, the failure of fracture and damage still occurred.

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