Work has begun to deteriorate oil, add new oil does not prolong life. Should be all the new ones. To control the leakage of hydraulic machinery and piping, the flow of hydraulic compactor minimum maintenance how to let the chance of reducing the pump maintenance. Different manufacturers of working oil can not mix, as well as with vendors manufacture hydraulic compactor repair company, but a different name, and the need to avoid the level of working oil mix. Due to the oil additive can cause deterioration. Based on the pressure relief valve closed loop pressure relief, pressure drop when the piston, a is the pressure side, b is suction side, so the decline in the valve opening roller hydraulic repair factory, while the slide valve is closed. Pressure relief valve does not work. After work, the pump commutation, b into the pressure side, pump maintenance force to overcome the spring force of the slide valve spool moves to the left, turn on the paths. So on the cylinder chamber through a, 1,4 and 7 relief throttle, while also helping pump suction pressure relief. Relief speed from 7 to adjust the throttle. Hydraulic roller repair factory | Yan'an roller hydraulic repair | Xi'an Xi'an Chengtong hydraulic repair Chengtong hydraulic repair Limited. Xi'an Chengtong Hydraulic Maintenance Co. (www.huosu360.com) strong, credible, in Xi'an, industrial maintenance, installation and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Xi'an-hydraulic service and you work through into the brilliant, for a better future!