液压系统故障排除（Troubleshooting of hydraulic system）.docVIP

液压系统故障排除（Troubleshooting of hydraulic system） Hydraulic system failure and solutions (tensile press machine, die casting machine, machine, broaching machine, packing machine, shearing machine, etc.) (1) no pressure in the hydraulic system; Causes and solutions of system no pressure fault. Fault source, fault, cause, solution Mechanical component 1. the coupling of pump and motor is not on one central line 2. coupling loose or problems 3. problems with the shock proof device (corresponding measures) 1. re search for the center 2. couplings shall be fastened or replaced 3. check, fasten or replace new parts Excessive resistance of suction line 1. the oil outlet filter blocked or counted too large 2. oil suction pipe blockage or leakage occurred 3. the oil level is too low (corresponding measures) 1. check, clean or replace suitable new parts 2. inspection processing 3. check the gas Hydraulic pump 1., the pump shock device problems 2. the maximum setting pressure of the pump is too great 3. rotating shaft seal or oil suction port seal problems 4. the control system of the pump is out of order (corresponding measures) 1. check, fasten or replace new parts 2. reset the maximum pressure 3. check the replacement of the new seal 4. readjust the control system Supply and return line 1., the supply and return pipeline loose or installation position is not good 2. return tubing slightly cold or no oil (corresponding measures) 1. check the fastening line or re run the pipe 2. check, process, or clean up Valve in oil supply line 1. valve clogged with dirt 2. valve throttling or nozzle is too small (corresponding measures) 1. check and clean up 2. check and replace the appropriate components Flow ratio control 1. flow control valve vibration affects other control components 2. noise caused by excessive flow 3. control system disorder 4. electromagnetic valve due to electromagnetic force or voltage caused by congestion or control system failure 5., the valve due to wear or dirt c