液压系统故障排除Troubleshooting of hydraulic system.docx

液压系统故障排除Troubleshooting of hydraulic system.docx

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液压系统故障排除Troubleshootingofhydraulicsystem

液压系统故障排除（Troubleshootingofhydraulicsystem）

Hydraulicsystemfailureandsolutions（tensilepressmachine,diecastingmachine,machine,broachingmachine,packingmachine,shearingmachine,etc.）

（1）nopressureinthehydraulicsystem;

Causesandsolutionsofsystemnopressurefault.

Faultsource,fault,cause,solution

Mechanicalcomponent

1.thecouplingofpumpandmotorisnotononecentralline

2.couplinglooseorproblems

3.problemswiththeshockproofdevice

（correspondingmeasures）1.researchforthecenter

2.couplingsshallbefastenedorreplaced

3.check,fastenorreplacenewparts

Excessiveresistanceofsuctionline

1.theoiloutletfilterblockedorcountedtoolarge

2.oilsuctionpipeblockageorleakageoccurred

3.theoillevelistoolow

（correspondingmeasures）1.check,cleanorreplacesuitablenewparts

2.inspectionprocessing

3.checkthegas

Hydraulicpump

1.,thepumpshockdeviceproblems

2.themaximumsettingpressureofthepumpistoogreat

3.rotatingshaftsealoroilsuctionportsealproblems

4.thecontrolsystemofthepumpisoutoforder

（correspondingmeasures）1.check,fastenorreplacenewparts

2.resetthemaximumpressure

3.checkthereplacementofthenewseal

4.readjustthecontrolsystem

Supplyandreturnline

1.,thesupplyandreturnpipelinelooseorinstallationpositionisnotgood

2.returntubingslightlycoldornooil

（correspondingmeasures）1.checkthefasteninglineorrerunthepipe

2.check,process,orcleanup

Valveinoilsupplyline

1.valvecloggedwithdirt

2.valvethrottlingornozzleistoosmall

（correspondingmeasures）1.checkandcleanup

2.checkandreplacetheappropriatecomponents

Flowratiocontrol

1.flowcontrolvalvevibrationaffectsothercontrolcomponents

2.noisecausedbyexcessiveflow

3.controlsystemdisorder

4.electromagneticvalveduetoelectromagneticforceorvoltagecausedbycongestionorcontrolsystemfailure

5.,thevalveduetowearordirtcloggingproblems

6.systempressureoutofcontrol

（correspondingmeasures）1.inspectionprocessing

2.adjustthefloworproportionofthecontrolpanelproperly

3.readjustthecontrolsystem

4.checksolenoidvalve,wirepackageanditscircuit

5.check,cleanorreplacenewparts

6.readjustthepressurecontrolpanel

Hydraulicoil

1.becausetheoillevelislowortheoiltemperatureislow,thehydraulicoilviscosityisbig,causestheoilabsorptiondifficulty

2.hydraulicoildirtydamageinternalcomponents

3.hydraulicoilfoaming

（correspondingmeasures）1.checkandprocesshydraulicoil

2.replacethenewoil

3.checkthecauseorreplacethenewoil

（two）lackofpressure（insufficientoutputforceandtorque）;

Causesandsolutionsoflowpressure（insufficientoutputforceandtorque）.

Faultsource,fault,cause,solution

Mechanicalcomponent

1.motorcouplingwear

2.hydraulicpumpormotorsteeringisnotcorrect

3.problemswiththeshockproofdevice

4.thekeysonthetransmissionshaftofthemotororhydraulicpumparesheared

（correspondingmeasures）1.checkorreplacethecoupling

2.inspectionprocessing

3.check,fastenorreplacenewshockabsorption

4.inspectionprocessing

Suctionlinehydraulicpump

One

Filtercloggingormeshistoolarge

2.duetowearandtear,thepumpleaksinside

3.hydraulicpumpcontrolcomponentfailureorcontrolpressuresettingistoolow

（correspondingmeasures）1.check,cleanorreplacesuitablenewparts

2.check,handleorreplacesuitablenewparts

3.check,process,orresetthepressuresensorsetting

Supplyandreturnline

1.thesupplyandreturnpipelineleaks

2.theinternalresistanceofthepipelineistoolargeorthefilterofoilsuctionportisblocked

（correspondingmeasures）1.inspectionprocessing

2.check,cleanorreplacenewparts

Valveinoilsupplyline

1.valvepressuresettingistoolow

2.internalleakageduetowearofvalvebodyorseal

3.thespringofthevalvebodyisdamaged

4.valvemodelisincorrectorinternalthrottling（nozzle）istoosmall

（correspondingmeasures）1.resetthesetpressure

2.check,repairorreplacenewspareparts

3.checkandreplacenewspareparts

4.replacetheappropriateparts

Flowratiocontrolvalve

1.internalflowdampingistoolargetoproducetoomuchpressuredrop

2.flowcontrolvalveadjustmentunreasonableorfailure

3.proportionalcontrolvalveworkingstateiswrong（suchaszerodriftorpressuresettozero,theplungerisnotinthemiddleposition）

4.internalleakageduetowearorinternalone-wayvalveproblems

5.,thecontrolvalvespoolstuck,causingfailure

（correspondingmeasures）1.inspectionprocessing

2.readjustfloworreplacenewparts

3.readjustthezeroormandatoryresetbyadjustingtheproportionalcontrolpanelorcheckthepressuresensorsignal

4.checksolenoidvalveorone-wayvalveorrepairreplacement

5.check,processorreplacenewparts

Hydraulicoil

1.viscosityofLiu'sinternalleakageismoreserious

2.,theviscosityistoohighandtheflowisblocked

3.hydraulicoilfoaming

（correspondingmeasures）1.checkoil,oiltemperatureorreplacenewoil

2.checkoiltemperature

3.checkthecauseorreplacetheoil

Otherquestions

1.pressurecontrolsystemcontrolprocedureshaveproblems

2.theactuatingelementisoutoforder

（correspondingmeasure）1.changeandupdatethecontrolprogramthroughPC

2.inspectionprocessing

（three）emergencyactionofcylinderormotor（fluctuationofpressureandflow）;

Cylinderormotoremergencyaction（pressure,no,flowratefluctuations）,causesandsolutions.

Faultsource,fault,cause,solution

Mechanicalcomponentssuctionpiperesistanceistoolarge

1.thecouplingofpumpandmotorisnotononecentralline

2.suctionlineistoosmallorturnmore

The3.oiloutletfiltercloggingormeshistoolarge

4.suctionpipeblockageorleakage

（correspondingmeasures）1.reCenter

2.adjustthesuctionlineproperly

3.checkorreplacethefilter

4.inspectionprocessing

Hydraulicpump

Theflowregulatorofthe1.variableoutputpumphasproblems

2.pumpsystempressureregulatorbackpressurevalveproblems

（adjustment）1.adjustorreplacenewspareparts

2.checkthepressureorreplacethenewspareparts

Supplyandreturnline

One

Thesupplyandreturnpipelineisslow,badorinternalresistanceistoolarge

2.returnlinefilterclogged

（ofmeasures）1.check,adjust,orcleanup

2.check,cleanorreplacenewparts

Valveinoilsupplyline

1.theremotecontrolofthevalveinthepipelinehasproblems

2.theone-wayvalveinthepipelinehasproblems

（correspondingmeasures）1.checkthecontrolcircuit

2.check,processorreplacenewparts

Flowanddirectioncontrolvalve

1.flowcontrolvalvevibrationaffectsothercontrolcomponents

2.noisecausedbyexcessiveflow

3.controlsystemdisorder

4.electromagneticvalvebecauseofsmallelectromagneticforceorlowvoltagecausecongestionorcontrolsystemfailure

5.,thevalveduetowearordirtcloggingproblems,thesystempressureoutofcontrol

（correspondingmeasures）1.inspectionprocessing

2.adjustthefloworreplacethenewparts

3.readjustthezeroormandatoryresetbyadjustingtheproportionalcontrolpanelorcheckthepressuresensorsignal

4.checksolenoidvalveorone-wayvalveorrepairreplacement

5.check,processorreplacenewparts

Hydraulicoil

1.hydraulicoilpollution

2.hydraulicoilfoaming

（correspondingmeasures）1.replacenewoil

2.checkcauses

Otherquestions

1.thereisnotenoughlargereactionforceattheoutput（suchaspressurereducingnozzleandpressurereducingvalve）

（correspondingmeasures）1.considerreplacing

（four）hydraulicoiltemperatureistoohighatwork

Causesandsolutionsforexcessivetemperatureofhydraulicoil.

Faultsource,fault,cause,solution

Hydraulicpump

1.hydraulicpumpbecauseofwearandtear,resultinginreducedefficiency

Theregulatorofthe2.variablepumpisoutoforder

3.hydraulicpumpfloworspeedregulationistoobig

（correspondingmeasures）1.replacementofnewspareparts

2.check,adjustorreplacenewspareparts

3.readjusttheflow

Supplyandreturnline

1.,thesupplyandreturnoilpipelinecrosssectionissmall,leadingtogreaterfriction

2.filtercloggingintheline

（correspondingmeasures）1.considerreplacingthenewpiping

2.checkcleanup

Valveinoilsupplyline

1.continuousworkingtimeistoolong

2.pressuresettingtoohigh

（correspondingmeasures）1.properstopcooling

2.resetthepressure

Flowanddirectioncontrolvalve

1.,theflowsettingistoolow（toomuchflowthroughthepump）orflowcontrolvalveproblems

2.proportionalcontrolvalveduetoleakagelosses

Whenthe3.signaliszero,theproportionalcontrolvalvespoolisnotinthemiddlestate

（correspondingmeasure）1.readjusttheflowsettingorreplacethenewpart

2.checkanddealwithinternalandexternalleakageofproportionalvalveandinternalone-wayvalvewear

3.adjusttheproportionoftheproportionalcontrolvalve,thecontrolboardresetthezeroormandatoryreset,checkthepressuresensorsignal

Hydraulicoil

1.,thetemperatureistoolowandtheinternalleakageismoreserious

2.thetemperatureistoohighandtheflowisblocked

3.hydraulicoilfoaming

（correspondingmeasures）1.checkoil,oiltemperatureorreplacenewoil

2.checkoiltemperature

3.checkthecauseorreplacetheoil

Otherquestions

1.lackofcoolingcapacityorlowcoolingefficiency

2.,thehydraulicpumphasbeeninastateofload,thehydraulicpumppressurevalueislowerthanthesystempressurevalvesetvalueorsystempressur