Wheel Loader is a kind of earthwork construction machinery widely used in highway, railway, building, hydropower, port, mine and other construction projects. Wheel Loader includes engine, torque converter, gearbox, front drive axle and rear drive axle. The shovel and loading and unloading operation of loader is realized by the movement of its working device.Loader working device consists of bucket,arm,connecting rod,rocker arm and rotary bucket oil cylinder,arm oil cylinder,etc