1. Clean the vertical shaft and front axle; 2. Soak the vertical shaft with engine oil for about 1 hour, and prepare a brass rod with a length of 2m and a length of 3n as a spear. D, pad the feather support of the front axle, then put the prepared spear above the vertical shaft and shovel it out by hydraulic method. This can effectively avoid the above hazards and reach the technical standards of automobile maintenance technology. In addition, the materials of vertical shaft and front axle are affected by heat, which can not meet the technical performance requirements of raw materials, and the consequences will affect the front wheel positioning and driving safety of automobiles.