The damage, wear, deformation and loss of dynamic balance of transmission shaft parts will cause abnormal noise and vibration during driving, and in serious cases, it will lead to the damage of relevant parts. When the car is driving, it makes a "geden" sound when starting or accelerating rapidly, and obviously shows the feeling of loose parts. If it is not the loose transmission gear of the drive axle, it is obviously the loose transmission shaft parts. The loose parts are nothing more than universal joint cross bearing or steel bowl and flange fork, spline shaft and spline sleeve of expansion sleeve. Generally speaking, the cross shaft diameter and bearing clearance shall not exceed 0.13MM, and the meshing clearance between telescopic spline shaft and spline sleeve shall not exceed 0.3mm. If the service limit is exceeded, it shall be repaired or replaced.

 

If the chassis makes a "buzzing" sound during driving, and the higher the running speed, the louder the sound. This is generally caused by the wear and looseness of the cardan joint spider and bearing, the wear of the middle bearing of the transmission shaft, the damage of the middle rubber support or the looseness of the hanger, or the wrong fixed position of the hanger.

 

six × 4 when the vehicle is under heavy load, especially when driving bumps, it occasionally makes 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 vehicle speed and accompanied by jitter, it is generally caused by the imbalance of transmission shaft. This vibration is most obvious in the cab. The unbalance of the dynamic balance of the transmission shaft shall be less than 100 g. cm

 

Serious failure of dynamic balance of transmission shaft will lead to damage of relevant components. The most common are cracks in the clutch housing and fatigue damage of the intermediate rubber support.

 

The installation of the middle hanger of the transmission shaft is very important in maintenance. If the hanger is installed in an improper position, it will increase the running resistance and noise of the transmission shaft, resulting in early damage to the bearing. When reinstalling the hanger, first do not tighten the fixing bolts of the hanger, support the vehicle driving wheel off the ground with a jack, shift to low gear, slowly rotate the transmission shaft to align the transmission shaft