Low low speed test run: Repeat start and shut down the motor, the pump and the suction is released in the air. Ten percent of the input pressure and flow, open radio station forward and backward motion, flow and pressure so that the exhaust valve. Running ten minutes later, as the hydraulic system no abnormal sound, you can boot. If you stop using the machine again after a period of use should also do so to boot. Variables constant pressure pump control called constant variable pump, its control principle shown in Figure 1, where 1 is the control slide valve, pressure regulator spring 2, 3 is a control variable cylinder pump care, 1 and 2 are collectively referred to constant pressure valve. Training variable pump when the system pressure is low, there is no right of control oil pressure cylinder, control cylinder runs right under the action of the spring, pushing the variable mechanism of the pump, the pump at maximum displacement state. When the system pressure increases to the set pressure of constant pressure valves, hydraulic pressure control spool ends more than a spring force of the pressure regulator valve to the right, the right pressure oil into the control cylinder, push the left control cylinders operating variables pump repair phone, then push the variable mechanism of the pump, the pump displacement is reduced, thus reducing the output flow, pump working with the constant pressure pump control to reduce the principle of 123 variables, the variable variable pump pump repair _ _ Jing Chong Jinan crystal by creating a hydraulic 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 continuous improvement to create innovative ideas will lead crystal hydraulic and you hand into the brilliant, for a better future!