1、液压系统故障排除Troubleshooting of hydraulic system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
2、 of system no pressure fault.Fault source, fault, cause, solutionMechanical component1. the coupling of pump and motor is not on one central line2. coupling loose or problems3. problems with the shock proof device(corresponding measures) 1. re search for the center2. couplings shall be fastened or r
3、eplaced3. check, fasten or replace new partsExcessive resistance of suction line1. the oil outlet filter blocked or counted too large2. oil suction pipe blockage or leakage occurred3. the oil level is too low(corresponding measures) 1. check, clean or replace suitable new parts2. inspection processi
4、ng3. check the gasHydraulic pump1., the pump shock device problems2. the maximum setting pressure of the pump is too great3. rotating shaft seal or oil suction port seal problems4. the control system of the pump is out of order(corresponding measures) 1. check, fasten or replace new parts2. reset th
5、e maximum pressure3. check the replacement of the new seal4. readjust the control systemSupply and return line1., the supply and return pipeline loose or installation position is not good2. return tubing slightly cold or no oil(corresponding measures) 1. check the fastening line or re run the pipe2.
6、 check, process, or clean upValve in oil supply line1. valve clogged with dirt2. valve throttling or nozzle is too small(corresponding measures) 1. check and clean up2. check and replace the appropriate componentsFlow ratio control1. flow control valve vibration affects other control components2. no
7、ise caused by excessive flow3. control system disorder4. electromagnetic valve due to electromagnetic force or voltage caused by congestion or control system failure5., the valve due to wear or dirt clogging problems6. system pressure out of control(corresponding measures) 1. inspection processing2.
8、 adjust the flow or proportion of the control panel properly3. readjust the control system4. check solenoid valve, wire package and its circuit5. check, clean or replace new parts6. re adjust the pressure control panelHydraulic oil1. because the oil level is low or the oil temperature is low, the hy
9、draulic oil viscosity is big, causes the oil absorption difficulty2. hydraulic oil dirty damage internal components3. hydraulic oil foaming(corresponding measures) 1. check and process hydraulic oil2. replace the new oil3. check the cause or replace the new oil(two) lack of pressure (insufficient ou
10、tput force and torque);Causes and solutions of low pressure (insufficient output force and torque).Fault source, fault, cause, solutionMechanical component1. motor coupling wear2. hydraulic pump or motor steering is not correct3. problems with the shock proof device4. the keys on the transmission sh
11、aft of the motor or hydraulic pump are sheared(corresponding measures) 1. check or replace the coupling2. inspection processing3. check, fasten or replace new shock absorption4. inspection processingSuction line hydraulic pumpOneFilter clogging or mesh is too large2. due to wear and tear, the pump l
12、eaks inside3. hydraulic pump control component failure or control pressure setting is too low(corresponding measures) 1. check, clean or replace suitable new parts2. check, handle or replace suitable new parts3. check, process, or reset the pressure sensor settingSupply and return line1. the supply
13、and return pipeline leaks2. the internal resistance of the pipeline is too large or the filter of oil suction port is blocked(corresponding measures) 1. inspection processing2. check, clean or replace new partsValve in oil supply line1. valve pressure setting is too low2. internal leakage due to wea
14、r of valve body or seal3. the spring of the valve body is damaged4. valve model is incorrect or internal throttling (nozzle) is too small(corresponding measures) 1. reset the set pressure2. check, repair or replace new spare parts3. check and replace new spare parts4. replace the appropriate partsFl
15、ow ratio control valve1. internal flow damping is too large to produce too much pressure drop2. flow control valve adjustment unreasonable or failure3. proportional control valve working state is wrong (such as zero drift or pressure set to zero, the plunger is not in the middle position)4. internal
16、 leakage due to wear or internal one-way valve problems5., the control valve spool stuck, causing failure(corresponding measures) 1. inspection processing2. re adjust flow or replace new parts3. readjust the zero or mandatory reset by adjusting the proportional control panel or check the pressure se
17、nsor signal4. check solenoid valve or one-way valve or repair replacement5. check, process or replace new partsHydraulic oil1. viscosity of Lius internal leakage is more serious2., the viscosity is too high and the flow is blocked3. hydraulic oil foaming(corresponding measures) 1. check oil, oil tem
18、perature or replace new oil2. check oil temperature3. check the cause or replace the oilOther questions1. pressure control system control procedures have problems2. the actuating element is out of order(corresponding measure) 1. change and update the control program through PC2. inspection processin
19、g(three) emergency action of cylinder or motor (fluctuation of pressure and flow);Cylinder or motor emergency action (pressure, no, flow rate fluctuations), causes and solutions.Fault source, fault, cause, solutionMechanical components suction pipe resistance is too large1. the coupling of pump and
20、motor is not on one central line2. suction line is too small or turn moreThe 3. oil outlet filter clogging or mesh is too large4. suction pipe blockage or leakage(corresponding measures) 1. re Center2. adjust the suction line properly3. check or replace the filter4. inspection processingHydraulic pu
21、mpThe flow regulator of the 1. variable output pump has problems2. pump system pressure regulator back pressure valve problems(adjustment) 1. adjust or replace new spare parts2. check the pressure or replace the new spare partsSupply and return lineOneThe supply and return pipeline is slow, bad or i
22、nternal resistance is too large2. return line filter clogged(of measures) 1. check, adjust, or clean up2. check, clean or replace new partsValve in oil supply line1. the remote control of the valve in the pipeline has problems2. the one-way valve in the pipeline has problems(corresponding measures)
23、1. check the control circuit2. check, process or replace new partsFlow and direction control valve1. flow control valve vibration affects other control components2. noise caused by excessive flow3. control system disorder4. electromagnetic valve because of small electromagnetic force or low voltage
24、cause congestion or control system failure5., the valve due to wear or dirt clogging problems, the system pressure out of control(corresponding measures) 1. inspection processing2. adjust the flow or replace the new parts3. readjust the zero or mandatory reset by adjusting the proportional control p
25、anel or check the pressure sensor signal4. check solenoid valve or one-way valve or repair replacement5. check, process or replace new partsHydraulic oil1. hydraulic oil pollution2. hydraulic oil foaming(corresponding measures) 1. replace new oil2. check causesOther questions1. there is not enough l
26、arge reaction force at the output (such as pressure reducing nozzle and pressure reducing valve)(corresponding measures) 1. consider replacing(four) hydraulic oil temperature is too high at workCauses and solutions for excessive temperature of hydraulic oil.Fault source, fault, cause, solutionHydrau
27、lic pump1. hydraulic pump because of wear and tear, resulting in reduced efficiencyThe regulator of the 2. variable pump is out of order3. hydraulic pump flow or speed regulation is too big(corresponding measures) 1. replacement of new spare parts2. check, adjust or replace new spare parts3. readjus
28、t the flowSupply and return line1., the supply and return oil pipeline cross section is small, leading to greater friction2. filter clogging in the line(corresponding measures) 1. consider replacing the new piping2. check clean upValve in oil supply line1. continuous working time is too long2. press
29、ure setting too high(corresponding measures) 1. proper stop cooling2. reset the pressureFlow and direction control valve1., the flow setting is too low (too much flow through the pump) or flow control valve problems2. proportional control valve due to leakage lossesWhen the 3. signal is zero, the pr
30、oportional control valve spool is not in the middle state(corresponding measure) 1. readjust the flow setting or replace the new part2. check and deal with internal and external leakage of proportional valve and internal one-way valve wear3. adjust the proportion of the proportional control valve, t
31、he control board reset the zero or mandatory reset, check the pressure sensor signalHydraulic oil1., the temperature is too low and the internal leakage is more serious2. the temperature is too high and the flow is blocked3. hydraulic oil foaming(corresponding measures) 1. check oil, oil temperature
32、 or replace new oil2. check oil temperature3. check the cause or replace the oilOther questions1. lack of cooling capacity or low cooling efficiency2., the hydraulic pump has been in a state of load, the hydraulic pump pressure value is lower than the system pressure valve set value or system pressur
