Diagnosis and elimination of common faults of transmission shaft

The damage, wear, deformation, and loss of dynamic balance of the drive shaft components will cause abnormal noise and vibration when the car is driving, and will cause damage to related components in severe cases. When the car is running, it makes a “Gerdon” sound when it starts or accelerates rapidly, and it clearly shows the feeling of loose parts. If it is not the loosening of the drive axle transmission gear, it is obviously that the transmission shaft is loose. The loose parts are nothing more than universal joint cross bearings or steel bowl and flange fork, the spline shaft and spline sleeve of the telescopic sleeve. Generally speaking, the cross shaft diameter and the bearing openness should not exceed 0.13mm, and the meshing gap between the telescopic spline shaft and the spline sleeve should not exceed 0.3mm. The service limit should be repaired or replaced.
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If the chassis makes a “humming” sound while the car is driving, and the higher the running speed, the louder the sound. This is generally caused by the wear and tear of the universal joint cross shaft and the bearing, the middle bearing of the transmission shaft, the damage of the intermediate rubber support or the loose hanger, or the fixed position of the hanger.

When a 6×4 car is under heavy load, especially when driving bumps, it occasionally makes a knocking sound. Pay attention to check whether the balance shaft of the middle and rear axle is displaced and interferes with the transmission shaft. If the noise increases with the increase of the vehicle speed during the operation of the car, and accompanied by jitter, this is generally caused by the loss of balance of the transmission shaft. This vibration is most noticeable in the cab. The unbalance of the dynamic balance of the drive shaft should be less than 100g.cm.

Serious failure of the dynamic balance of the drive shaft will cause damage to related parts. The most common are the clutch shell cracks and the fatigue damage of the middle rubber support