Why is there noise in the drive axle of the loader?

The drive axle of the loader is noisy and does not disappear when sliding. The cause of the fault is insufficient lubricating oil in the drive axle housing, the driving and driven spiral bevel gear, the meshing gap is too small, and the gap between the differential housing and the cross shaft planetary gear is too large. Method: add enough lubricating oil, adjust the gap to the specified value according to the standard.