(l) Improved hydraulic system design. After many demonstration, the advanced preferential valve and load sensing full hydraulic steering device is finally adopted. New system can in accordance with the requirements for steering, give the distribution of flow, regardless of the load size, the steering wheel rotation speed to ensure oil supply is adequate, the rest can be used all the work device of the supply circuit, thereby eliminating the loss caused by steering loop oil supply too much power, improve the efficiency of the system, reduce the working pressure of hydraulic pump.(2) Optimize the design of movable arm cylinder and hydraulic pump to reduce the working pressure of the system. Through optimization calculation, the movable arm cylinder adopts the standard series 80/4. The displacement of the hydraulic pump was increased from 10mL /r to 14mL /r, and the system set pressure was 14MPa, meeting the lifting force and speed requirements of the moving arm cylinder.(3) Proper use and maintenance of the loader should also be paid attention to in the process of use. Hydraulic oil should be added or replaced regularly to maintain the cleanliness of hydraulic oil and strengthen daily inspection and maintenance.