Variable piston pump oil pressure pump, pump casing variable housing through the hole into the inferior vena variable housing through a one-way valve, when the downward movement of the lever, push downward movement of the servo piston, the servo valve the valve port open, the oil pressure of the lower chamber of the housing Variables piston through the hole into the superior vena variable case, since the upper chamber area larger than the lower chamber, hydraulic pressure pushes the piston downward movement of the hydraulic pump sales, drive-shaft the variable head rotates around a ball pump repair, changing the inclination angle of the variable head (increase), piston pump flow rate increases. On the other hand lever upward motion, tilt angle variables change in the opposite direction head, pump flow also changes. When the tilt angle changed to zero after the variable angle head in the negative direction change, reversing the flow generation, pump out the oil port transformation. Working pressure A or B port pressure rated pressure --PN = 35MPa maximum pressure --Pmax = 40MPa A, B port pressure is no greater than 63MPa pump, maximum pressure on each side of the oil port to allow the maximum pressure 40MPa ● housing vent Oil pressure (T ports) - Pabs = 0.2MPa ● working medium and conditions: mineral oil: 40 low pour hydraulic oil Working temperature: -25 ℃ -80 ℃ viscosity range: 10 ~ 1000mm2 / s (10,1000mm2 / s for short-term use) optimum viscosity: 16 ~ 25mm2 / s recommended filtering accuracy 10μm, 25 ~ 40μm coarser filter can also be used, but with a 10μm filter prolong the life of the motor oil. Maintenance of hydraulic pumps, hydraulic Chong Jing (certification), the hydraulic pump from Jinan Jing Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) Shandong Jinan, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In the crystal creating hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal creating hydraulic better future.