Constant Control Priorities in pilot pressure control hydraulic excavator, the pilot pressure control and constant voltage control can not control the motor, when the motor constant working pressure is lower than the set pressure of the hydraulic pump repair, motor will be fully provided by the system pilot pressure to control; when the motor operating pressure reaches the set pressure constant, constant pressure control servo valve motor will be automatically controlled. Mainly by adjusting the control lever 1 knot, the regulator housing 2, variable piston 3, the pilot pressure control servo valve 4, the regulator spring 5, the feedback spring 6, the regulator guide rod 7, constant pressure control servo valve assembly 8 and one-way valve. Constant pressure control servo valve consists of a control valve housing, control spool, the spring and the adjusting screw and other components. Working pressure A or B port pressure rated pressure --PN = 35MPa maximum pressure --Pmax = 40MPa A, B port pressure is no greater than 63MPa, the maximum pressure on each side of the oil port to allow the maximum pressure 40MPa ● case drain pressure (T port) - 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) Best 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. Pump maintenance, hydraulic pumps, hydraulic creating reliable quality crystal grain from Jinan 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!