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1、挖掘机液压故障检修分析（Troubleshootingofexcavatorhydraulicpressure）TroubleshootingofexcavatorhydraulicpressureTheworkingprincipleofexcavatorhydraulicsystemisexpoundedHydraulicfailureanalysis,andproposesolutionsThehydraulicsystemofexcavatormainlyconsistsofpilotcontrol,hydraulicsystem,slewinghydrauli
2、csystem,runninghydraulicsystem,workingdeviceandhydraulicsystem,Theutilitymodelhastheadvantagesofcompactstructure,flexiblemovement,stableoperation,convenientoperation,etc.HydraulicsystemuseshydraulicoilasmediumtotransferpowerBecauseofthesystemThepartofthehydrauliccomponentiswornandleakedO
3、verheatingatthesametimeInabilitytoworkandmalfunction.Generally,hydraulicfaultsaresuddenandcovertAndinvolveMorehydrauliccomponentsPrincipletoanalyzethecauseofhydraulicfailureaccurately,findthemethodtosolvetheproblemandimprovethequalityofmaintenance.1theworkingprincipleofexcavatorhydraulic
4、systemItbringssomedifficultiestotroubleshootingandsolvingTherefore,whenthehydraulicfailureischeckedandrepairedThepremiseistounderstandhydraulicworkThehydraulicsystemofanexcavatorisusuallycomposedofsomeloopsTheyincludeworkcircuit,voltagelimitingcircuit,unloadingloop,buffercircuitandthrott
5、lingspeedregulationAndthrottlingspeedlimitloop,speedlimitloopandpilotvalvecontrolloop,etc..Itshydrauliccomponentmainlyhastheworkpump,therepairoilpump,thepilotcontrolvalve,themastercontrolValve,safetyvalve,bigarmcylinder,smallarmcylinder,bucketcylinder,oiltankandhydraulictube.Excavatorhyd
6、raulicsysteminthecourseofworkThehydraulicoilispumpedfromthetankbottomthroughtheoilfilterandispumpedbytheworkpumpTheoutputfromthepumphasacertainpressureThehydraulicoilentersasetofparallelmaincontrolvalves.Throughthehandle,pilotvalve,workvalvesettoachievethecorrespondingactionThesystempass
7、esthroughthetotaloilpathThemasterreliefvalvelimitsthetotalpressureofthewholesystemThesafetyvalvesoftheworkingoilcircuitrespectivelyactasoverloadprotectionandhydraulicoilcompensationtoeachoilcircuitrespectively.2excavatorhydraulicsystemcommonfaultanalysisandsolutionThesett
