In addition to the improper quality of the spiral bevel gear mesh and the improper adjustment of the gap, improper operation is the main reason for the phenomenon of tooth punching. Under normal circumstances, the front and rear axles of the wheel loader are driven at the same time during operation. If the load is overloaded, the rear axle is off the ground, and the full load is borne by the front axle, the final drive of the front axle is easily damaged. If the bucket cut-in angle of the front loader is too large and the boom is placed too low, it is easy to cause the front axle to leave the ground during operation, and the entire load is borne by the rear axle. At this time, it is easy to cause damage to the rear axle main reducer. The main reducer is damaged, and it is mostly caused by broken teeth and abnormal noise.