When the crane is running normally, the bridge differential gear is damaged.

During the normal operation of the crane, the gear teeth of the bridge differential are damaged, which may be due to improper adjustment of the meshing clearance and meshing mark of the gear. According to relevant data, automobile differentials are generally strong, and the torque they can bear far exceeds that of the front gearbox and transmission shaft, so they will not be damaged under normal use. If the differential gear is broken, the most likely reason is that you used unqualified gear oil. If you have ever repaired the drive axle, it is also possible that the meshing clearance and meshing trace of the gear have not been adjusted properly.