Piston pump is an important means of hydraulic system. It relies on the piston in the cylinder reciprocating pump repair, so that the volume of the cavity sealing work to achieve a change in the suction pressure oil. Piston pumps with a rated pressure, compact structure, high efficiency and flow and easy adjustment, are widely used in high-pressure, high flow and flow needs to be adjusted occasions, such as hydraulic machines, construction machinery and ships in. The output pressure of the pump is determined by the load, and approximately proportional to the input torque. There are two fault output abnormal pressure. (1) The output pressure is too low when the pump is self-priming in the state, if the inlet line or system leak hydraulic cylinders, check valves, valve leak have a greater pump, all the pressure will not rise up . This need to find the leak at the pump maintenance, tightening, replace the seals, it can increase the pressure. Adjust the pressure relief valve is faulty or low hydraulic system pressure do not increase sales, readjust the pressure relief valve or repair. If the hydraulic cylinder and valve plate bias caused large spills, serious, the cylinder may rupture should be re-ground mating surfaces or replace the pump. (2) The output pressure is too high if the loop load continues to rise, the pump pressure has continued to grow, comes as normal. If the load is constant, the pump pressure exceeds the pressure value required by the load, you should check the outside of the pump hydraulic components, such as directional valves, pressure valves, actuators and return oil pipes. If the maximum pressure is too high, adjust the relief valve. Hydraulic repair, hydraulic pumps, hydraulic pressure from Jinan Jing Jing Chong Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead crystal create hydraulic and you hand into the brilliant, for a better future!