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GENERALSAFETYINFORMATION

Donotoperateorperformanymaintenanceonthis machineuntilallinstructionsfoundintheOPERATORSMANUALandthisMANUALhavebeenthoroughlyreadandunderstood.

Improperoperationormaintenanceofthismachine maycauseaccidentsandcouldresultinseriousinjuryordeath.

Alwayskeepthemanualinstorage.

Ifitismissingordamaged,placeanorderwithan authorizedourDistributorforareplacement.

Ifyouhaveanyquestions,pleaseconsultanauthorizedourDistributor.

(1)Mostaccidents,whichoccurduringoperation,are duetoneglectofprecautionarymeasuresandsafetyrules.Sufficientcareshouldbetakentoavoid theseaccidents.Erroneousoperation,lubrication ormaintenanceservicesareverydangerousand maycauseinjuryordeathofpersonnel.Therefore allprecautionarymeasures,NOTES,DANGERS, WARNINGSandCAUTIONScontainedinthemanualandonthemachineshouldbereadandunderstoodbyallpersonnelbeforestartinganyworkwith oronthemachine.

(2)Operation,inspection,andmaintenanceshouldbe carefullycarriedout,andsafetymustbegiventhe firstpriority.Messagesofsafetyareindicatedwith marks.Thesafetyinformationcontainedinthe manualisintendedonlytosupplementsafety codes,insurancerequirements,locallaws,rules andregulations.

(3)Messagesofsafetyappearinthemanualandon themachine:Allmessagesofsafetyareidentified byeitherwordof"DANGER","WARNING"and "CAUTION".

1)DANGER-Indicatesanimminentlyhazardous situationwhich,ifnotavoided,willresultin deathorseriousinjuryandisrepresentedas follows:

2)WARNING-Indicatesapotentiallyhazardous situationwhich,ifnotavoided,couldresultin deathorseriousinjuryandisrepresentedas follows:

3)CAUTION-Indicatesapotentiallyhazardous situationwhich,ifnotavoided,mayresultinminorormoderateinjury.Itmayalsobeusedto alertagainstpossibledamagetothemachine anditscomponentsandisrepresentedasfollows:

(4)Itisverydifficulttoforecasteverydangerthatmay occurduringoperation.However,safetycanbeensuredbyfullyunderstandingproperoperatingproceduresforthismachineaccordingtomethods recommendedbyManufacturer.

(5)Whileoperatingthemachine,besuretoperform workwithgreatcare,soasnottodamagethemachine,orallowaccidentstooccur.

(6)ContinuestudyingthemanualuntilallSafety,OperationandMaintenanceproceduresarecompletely understoodbyallpersonsworkingwiththemachine.

SAFETYPRECAUTIONS

Theproperandsafelubricationandmaintenance forthismachine,recommendedbyManufacturer, areoutlinedintheOPERATORSMANUALforthe machine.

Improperperformanceoflubricationormaintenanceproceduresaredangerousandcouldresult ininjuryordeath.ReadandunderstandtheMANUALbeforeperforminganylubricationormaintenance.

Theservicemanormechanicmaybeunfamiliarwith manyofthesystemsonthismachine.Thismakesit importanttousecautionwhenperformingservicework. Aknowledgeofthesystemandorcomponentsisimportantbeforetheremovalordisassemblyofanycomponent.

Becauseofthesizeofsomeofthemachinecomponents,theservicemanormechanicshouldcheckthe weightsnotedinthismanual.Useproperliftingprocedureswhenremovinganycomponents.Weightofcomponentstableisshowninthesection; SPECIFICATIONS.

Thefollowingisalistofbasicprecautionsthatmustalwaysbeobserved.

(1)ReadandunderstandallWarningplatesanddecal onthemachinebeforeOperating,Maintainingor Repairingthismachine.

(2)Alwayswearprotectiveglassesandprotective shoeswhenworkingaroundmachines.Inparticular,wearprotectiveglasseswhenusinghammers, punchesordriftsonanypartofthemachineorattachments.Useweldersgloves,hood/goggles, apronandtheprotectiveclothingappropriatetothe weldingjobbeingperformed.Donotwearloosefittingortornclothing.Removeallringsfromfingers, loosejewelry,confinelonghairandlooseclothing beforeworkingonthismachinery.

(3)Disconnectthebatteryandhanga"DoNotOperate"tagintheOperatorsCompartment.Removeignitionkeys.

(4)Ifpossible,makeallrepairswiththemachine parkedonafirmlevelsurface.Blockthemachine soitdoesnotrollwhileworkingonorunderthemachine.Hanga"DoNotOperate"tagintheOperatorsCompartment.

(5)Donotworkonanymachinethatissupportedonly bylift,jacksorahoist.Alwaysuseblocksorjack

stands,capableofsupportingthemachine,before performinganydisassembly. Donotoperatethismachineunlessyouhave readandunderstandtheinstructionsintheOPERATORSMANUAL.Impropermachineoperationisdangerousandcouldresultininjuryor death.

(6)Relieveallpressureinair,oilorwatersystemsbeforeanylines,fittingsorrelateditemsaredisconnectedorremoved.Alwaysmakesureallraised componentsareblockedcorrectlyandbealertfor possiblepressurewhendisconnectinganydevice fromasystemthatutilizespressure.

(7)Lowerthebucket,dozer,orotherattachmentsto thegroundbeforeperforminganyworkonthemachine.Ifthiscannotbedone,makesurethebucket, dozer,ripperorotherattachmentisblockedcorrectlytopreventitfromdroppingunexpectedly.

(8)Usestepsandgrabhandleswhenmountingordismountingamachine.Cleananymudordebrisfrom steps,walkwaysorworkplatformsbeforeusing. Alwaysfacetothemachinewhenusingsteps,laddersandwalkways.Whenitisnotpossibletouse thedesignedaccesssystem,provideladders,scaffolds,orworkplatformstoperformsaferepairoperations.

(9)Toavoidbackinjury,useahoistwhenliftingcomponentswhichweigh20kg(45lbs)ormore.Make sureallchains,hooks,slings,etc.,areingoodconditionandarethecorrectcapacity.Besurehooks arepositionedcorrectly.Liftingeyesarenottobe sideloadedduringaliftingoperation.

(10)Toavoidburns,bealertforhotpartsonmachines whichhavejustbeenstoppedandhotfluidsin lines,tubesandcompartments.

(11)Becarefulwhenremovingcoverplates.Gradually backoffthelasttwocapscrewsornutslocatedat oppositeendsofthecoverordeviceandcarefully prycoverloosetorelieveanyspringorotherpressure,beforeremovingthelasttwocapscrewsor nutscompletely.

(12)Becarefulwhenremovingfillercaps,breathersand plugsonthemachine.Holdaragoverthecapor plugtopreventbeingsprayedorsplashedbyliquidsunderpressure.Thedangerisevengreaterif themachinehasjustbeenstoppedbecausefluids canbehot.

(13)Alwaysusethepropertoolsthatareingoodconditionandthataresuitedforthejobathand.Besure youunderstandhowtousethembeforeperforming anyservicework.

(14)Reinstallallfastenerswiththesamepartnumber. Donotusealesserqualityfastenerifreplacements arenecessary.

(15)Repairswhichrequireweldingshouldbeperformedonlywiththebenefitoftheappropriatereferenceinformationandbypersonneladequately trainedandknowledgeableinweldingprocedures. Determinetypeofmetalbeingweldedandselect correctweldingprocedureandelectrodes,rodsor wiretoprovideaweldmetalstrengthequivalentat leasttothatoftheparentmetal.Makesuretodisconnectbatterybeforeanyweldingproceduresare attempted.

(16)Donotdamagewiringduringremovaloperations. Reinstallthewiringsoitisnotdamagednorwillbe damagedinoperationofthemachinebycontacting sharpcorners,orbyrubbingagainstsomeobjector hotsurface.Donotconnectwiringtoalinecontainingfluid.

(17)Besureallprotectivedevicesincludingguardsand shieldsareproperlyinstalledandfunctioningcorrectlybeforestartingarepair.Ifaguardorshield mustberemovedtoperformtherepairwork,use extracautionandreplacetheguardorshieldafter repairiscompleted.

(18)Themaintenanceandrepairworkwhileholdingthe bucketraisedisdangerousduetothepossibilityof afallingattachment.Dontfailtolowertheattachmentandplacethebuckettothegroundbefore startingthework.

(19)Looseordamagedfuel,lubricantandhydraulic lines,tubesandhosescancausefires.Donotbend orstrikehighpressurelinesorinstalloneswhich havebeenbentordamaged.Inspectlines,tubes andhosescarefully.Donotcheckforleakswith yourhands.Verysmall(pinhole)leakscanresultin ahighvelocityoilstreamthatwillbeinvisibleclose tothehose.Thisoilcanpenetratetheskinand causepersonalinjury.Usecard-boardorpaperto locatepinholeleaks.

(20)Tightenconnectionstothecorrecttorque.Make surethatallheatshields,clampsandguardsareinstalledcorrectlytoavoidexcessiveheat,vibration orrubbingagainstotherpartsduringoperation. Shieldsthatprotectagainstoilsprayontohotexhaustcomponentsineventofaline,tubeorseal failuremustbeinstalledcorrectly.

(21)Donotoperateamachineifanyrotatingpartis damagedorcontactsanyotherpartduringoperation.Anyhighspeedrotatingcomponentthathas beendamagedoralteredshouldbecheckedfor balancebeforereusing.

(22)Becarefulwhenservicingorseparatingthetracks (crawlers).Chipscanflywhenremovingorinstallingatrack(crawlers)pin.Wearsafetyglassesand longsleeveprotectiveclothing.Tracks(crawlers) canunrollveryquicklywhenseparated.Keepaway fromfrontandrearofmachine.Themachinecan moveunexpectedlywhenbothtracks(crawlers) aredisengagedfromthesprockets.Blockthemachinetopreventitfrommoving.

NOTE:

ThisManualispreparedasatechnicalmaterialin whichtheinformationnecessaryforthemaintenance andrepairingservicesofourhydraulicexcavatorsare collected,andiscategorizedinto7Chapters,Specification,Maintenance,System,Disassembly,Troubleshooting,Engine,andInstallationProceduresfor OptionalAttachment.

TheChapter"Specification"describesthespecificationsforentiremachineandmaterial,whichare instructiveforreplacementandrepairingofattachments.

TheChapter"Maintenance"describesthematerial, whichishelpfulformaintenanceserviceandadjustmentsforentiremachine.

TheChapter"System"describestheoperatingsystemlikehydraulicsystem,electricsystem,components,andsoon.

TheChapter"Disassembly"describestheremoval andinstallingofassemblymountedontheupper structureandundercarriage,andtheassembling anddisassemblingoftheassociatedhydraulic equipment.

TheChapter"Troubleshooting"describeshowto findthefaultequipment.

TheChapter"Engine"describestheenginesmakinguseofthe"MaintenanceManual"providedby thesuppliers.

TheChapter"InstallationProceduresforOptional Attachment"describesthesupplementsaddedon requestasrequired.

ThisManualmaybeproperlyrevisedduetotheimprovementofproducts,modificationofspecifications, etc.Andtherearecaseswherethesystemonactual machineandapartofthecontentsofthismanualmay differduetothevariationsofspecificationbycountries. Forthesectioninwhichthedescriptionishardlyunderstood,contactourdistributor.

Thenumberisassignedtoeveryparthandledinthis Manualonaccountofthedescription,buttheparts, whichcannotbesuppliedasservicepartsarecontained.Therefore,theordermustbeplacedwithrespectiveformalnumberwithdueconfirmationonthe PartsManualforapplicablemachine.

1.OUTLINE

1.1GENERALPRECAUTIONSFOR REPAIRS

1.1.1PREPARATIONBEFORE

DISASSEMBLING

(1)Understandingoperatingprocedure

ReadOPERATORSMANUALcarefullyto understandtheoperatingprocedure.

(2)Cleaningmachines

Removesoil,mud,anddustfromthemachine beforecarryingitintotheserviceshoptoprevent lossofworkefficiency,damageofparts,and difficultyinrustpreventionanddustprotectionwhile reassembling.

(3)Inspectingmachines

Identifythepartstobedisassembledbefore startingwork,determinethedisassembling procedurebyyourselfconsideringtheworkshop situationsetc.,andrequestprocurementof necessarypartsinadvance.

(4)Recording

Recordthefollowingitemsforcommunicationand preventionofrecurringmalfunction.

1)Inspectiondateandplace

2)Modelname,applicablemachinenumber,and hourmeterread

3)Troublecondition,placeandcause.

4)Visibleoilleakage,waterleakageanddamage

5)Cloggingoffilters,oillevel,oilquality,oil contaminationandlooseningofconnections

6)Resultofconsiderationifanyproblemexists basedontheoperationratepermonth calculatedfromhourmeterindicationafterthe lastinspectiondate.

(5)Arrangementandcleaninginserviceshop

1)Toolsrequiredforrepairwork.

2)Preparespacetoplacethedisassembledparts.

3)Prepareoilcontainersfordrainingoiletc.

1.1.2SAFETYINDISASSEMBLINGAND ASSEMBLING

(2)Suspendwarningtag"DONOTOPERATE"from thedoorknobortheoperatinglever,andhavea preliminarymeetingbeforestartingwork.

(3)Stoptheenginebeforestartinginspectionand maintenancetopreventtheoperatorbeingcaught inmachine.

(4)Identifythelocationofafirst-aidkitandafire extinguisher,andalsowheretomakecontactina stateofemergency.

(5)Chooseahard,levelandsafeplace,andplacethe attachmentonthegroundsecurely.

(6)Usealiftersuchasacranetoremoveheavyparts (20kg[45lbs]ormore)fromthemachine.

(7)Usepropertools,andreplaceorrepairdefective tools.

(8)Supportthemachineandattachmentwithsupports orblocksiftheworkisperformedinthelifted condition.

1.1.3DISASSEMBLINGANDASSEMBLING HYDRAULICEQUIPMENT

(1)Removinghydraulicequipment

1)Beforedisconnectingpipes,releasethe hydraulicpressureofthesystem,oropenthe returnsidecoverandtakeoutthefilter.

2)Carefullydrainoiloftheremovedpipesintoa containerswithoutspillingonthefloor.

3)Applyplugsorcapsonthepipeendstoavoid oilspillageanddustintrusion.

4)Cleanofftheexternalsurfaceoftheequipment beforedisassembling,anddrainhydraulicand gearoilbeforeplacingitontheworkbench.

(2)Disassemblinghydraulicequipment

1)Donotdisassemble,reassembleormodifythe hydraulicequipmentwithoutthepermissionof themanufacturer,whoisnotresponsibleforthe performanceandfunctionoftheproductafter modification.

2)Whendisassemblingandreassemblingfor unavoidablereason,refertheworktoqualified personnelwhohavethespecificknowledgeor completedthepartsservicetraining.

3)Providematchingmarkstofacilitate reassemblingwork.

(1)Wearappropriateclotheswithlongsleeves,safety shoes,safetyhelmetandprotectiveglasses.

4)Beforestartingthework,readthemanualof disassemblingprocedure,ifitisprovided,and decidewhethertheworkcanbeperformedby yourself.

5)Usethespecialjigandtoolswithoutfailifthey arespecified.

6)Ifitishardtoremoveapartaccordingtothe procedure,donottryitbyforcebutinvestigate thecause.

7)Placetheremovedpartsinorderandattach tagstofacilitatethereassembling.

8)Notethelocationandquantityofparts commonlyappliedtomultiplelocations.

(3)Inspectingparts

1)Ensurethatthedisassembledpartsarefree fromseizure,interferenceandunevencontact.

2)Measureandrecordwearconditionofparts andclearance.

3)Iftheproblemisfoundinapart,repairor replaceitwithanewone.

(4)Reassemblinghydraulicequipment

1)TurnONtheventilationfanoropenwindowsto maintaingoodventilationpriortostartingthe cleaningofparts.

2)Performroughandfinishcleaningbefore assembling.

3)Removewashingoilbyairandapplyclean hydraulicorgearoilforassembling.

4)AlwaysreplacetheremovedO-rings,backup ringsandoilsealswithnewonesbyapplying greaseinadvance.

5)Removedirtandmoisturefromandperform degreasingonthesurfacewhereliquidgasket tobeapplied.

6)Removerustpreventiveagentfromthenew partsbeforeuse.

7)Fitbearings,bushingsandoilsealsusing specialjigs.

8)Assemblethepartsutilizingmatchingmarks.

9)Ensureallthepartsarecompletelyassembled afterthework.

(5)Installinghydraulicequipment

1)Ensurehydraulicoilandlubricantareproperly supplied.

2)Performairbleedingwhen:

1.Hydraulicoilchanged

2.Partsofsuctionsidepipingreplaced

3.Hydraulicpumpinstalled

4.Slewingmotorinstalled

5.Travelmotorinstalled

6.Hydrauliccylinderinstalled

Operationofthehydraulicequipment withoutfillinghydraulicoilorlubricantor withoutperformingairbleedingwillresultin damagetotheequipment.

3)Performairbleedingofthehydraulicpumpand slewingmotorafterlooseningtheupperdrain plug,startingtheengineandkeepitinlowidle condition.

Completetheairbleedingwhenseepingof hydraulicoilisrecognized,andtightlyplug.

4)Performairbleedingofthetravelmotorandthe hydrauliccylindersbyrunningtheenginefor morethan5minutesatlowspeedwithoutload.

Donotallowthehydrauliccylinderto bottomonthestrokeendjustafterthe maintenance.

5)Performairbleedingofpilotlinebyperforming aseriesofdigging,slewingandtravel.

6)Checkhydraulicoillevelafterplacingthe attachmenttotheoilcheckposition,and replenishoilifnecessary.

1.1.4ELECTRICALEQUIPMENT

(1)Donotdisassembleelectricalequipment.

(2)Handleitcarefullynottodropandgiveashock.

(3)TurnthekeyOFFpriortoconnectingand disconnectingwork.

(4)Disconnecttheconnectorbyholdingitand pressingthelock.Donotpullthewiretoapplyforce tothecaulkingportion.

(5)Connecttheconnectorandensureitiscompletely locked.

(6)TurnthekeyOFFpriortotouchingtheterminalof starterorgenerator.

(7)Removetheground(earth)terminalofbattery whenhandlingtoolsaroundthebatteryoritsrelay.

(8)Donotsplashwaterontheelectricalequipment andconnectorsduringmachinewashing.

(9)Checkformoistureadhesioninsidethewaterproof connectorafterpullingitout,sinceitishardto removemoisturefromtheconnector.

Ifmoistureadhesionisfound,dryitcompletely beforetheconnection.

Batteryelectrolyteishazardous.

Batteryelectrolyteisdilutesulfuricacid.Exposure ofskinoreyestothisliquidwillcauseburningor lossofeyesight.

Iftheexposureoccurs,takethefollowing emergencymeasuresandseektheadviceofa medicalspecialist.

Whenskinexposed: Washwithwaterandsoapsufficiently.

Wheneyesexposed: Immediatelywashawaywithcitywater continuouslyformorethan10minutes.

Whenalargeamountoftheliquidflowsout: Neutralizewithsodiumbicarbonateorwash awaywithcitywater.

Whenswallowed: Drinkalargeamountofmilkorwater.

Whenclothesexposed: Immediatelyundressandwash.

1.1.5HYDRAULICPARTS

(1)O-ring

EnsureO-ringshaveelasticityandarenot damagedbeforeuse.

UsetheappropriateO-rings.O-ringsaremade ofvariouskindsofmaterialshavingdifferent hardnesstoapplytoavarietyofparts,suchas thepartformovingorfixedportion,subjectedto highpressure,andexposedtocorrosivefluid, evenifthesizeissame.

FittheO-ringswithoutdistortionandbend.

Alwayshandlefloatingsealsasapair.

(2)Flexiblehose(Fhose)

Usetheappropriateparts.Differentpartsare useddependingontheworkingpressureeven thesizeoffittingandthetotallengthofthehose issame.

Tightenthefittingatthespecifiedtorque. Ensurenokink,tension,interferencenoroil leakageisrecognized.

1.1.6WELDINGREPAIR

(1)Referrepairweldingtoqualifiedpersonnel accordingtotheappropriateprocedure.

(2)Disconnecttheground(earth)cableofthebattery beforestartingtherepair.

Failuretodosowillcausedamagetotheelectrical equipment.

(3)Moveawaythearticlesinadvancethatmaycause fireifexposedtosparks.

(4)Beforestartingtherepairoftheattachment,donot failtocovertheplatedsurfaceofthepistonrodwith flameproofsheettopreventitfrombeingexposed tosparks.

1.1.7ENVIRONMENTALMEASURE

(1)Runtheengineattheplacethatissufficiently ventilated.

(2)Industrialwastedisposal

Disposeofthefollowingpartsaccordingtothe relevantregulations: Wasteoilandwastecontainer Battery

(3)Precautionsforhandlinghydraulicoil

Exposureofeyestohydraulicoilwillcause inflammation.Wearprotectiveglassesbefore handlingtoavoidanaccident.Ifaneyeisexposed totheoil,takethefollowingemergencymeasures:

Whenaneyeexposed:

Immediatelywashawaywithcitywater sufficientlytillstimulativefeelingvanishes.

Whenswallowed: Donotletvomit,andreceivemedicaltreatment immediately.

Whenskinexposed: Washwithwaterandsoapsufficiently.

(4)Others

Usereplacementpartsandlubricantsauthorizedas themanufacturer'sgenuineparts.

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1.2INTERNATIONALUNIT

CONVERSIONSYSTEM (BasedonMARKSSTANDARD HANDBOOKFOR MECHANICALENGINEERS)

Introduction

AlthoughthismanualincludesInternationalSystemof UnitandFoot-PoundSystemofUnits,ifyouneedSI unit,refertothefollowinginternationalsystemofunits. Givenhereinafterisanexcerptoftheunitsthatare relatedtothismanual.

1.EtymologyofSIUnites

French:LeSystemeInternationaldUnites

English:InternationalSystemofUnits

2.ConstructionofSIUnitSystem

(1)Baseunits

Table1-1

QUANTITYUNITSYMBOL

Lengthmeterm

Masskilogramkg

Timeseconds

ElectriccurrentampereA

Thermodynamic temperature kelvinK

Amountof substance molmol

Luminous intensity candelacd

(2)Supplementaryunits

Table1-2

QUANTITYUNITSYMBOL

Planeangleradianrad

Solidanglesteradiansr

(3)DerivedUnits

Table1-3

QUANTITYUNITSYMBOL

Areasquaremeterm2

Volumecubicmeter m3

Velocitymeterpersecondm/s

Accelerationmeterpersecondsquaredm/s2

Densitykilogrampercubicmeterkg/m3

(4)DerivedUnitsbearingPeculiarDesignations

Table1-4

QUANTITYUNITSYMBOLFORMULA

FrequencyhertzHz1/s

ForcenewtonNkgm/s 2

Pressureand StresspascalPaN/m2

Energy,Work andQuantityof heat jouleJNm

PowerwattWJ/s

Quantityof electricity coulombCAs

Electric potential difference, Voltage,and Electromotive force voltVW/A

Quantityof staticelectricity andElectric capacitance faradFC/V Electric resistance ohm V/A

Celcius temperature celcius degreeor degree

C(t+273.15)K

Illuminanceluxlxlm/m2

(5)PrefixesofSI

(6)UnitConversion

Table1-5

Table1-6

QUANTITYGravitationalSICONVERSIONFACTOR

Masskgkg

ForcekgfN1kgf=9.807N

TorquekgfmNmkgfm=9.807Nm

Pressurekgf/cm2 MPa1kgf/cm2=0.09807MPa

Motive Power PSkW1PS=0.7355kW

Revolutionrpmmin-1 r/min*1

*1Unitsthatareallowedtouse.

2.SPECIFICATIONS

2.2MACHINEDIMENSIONS

(1)SK50SR-5(CANOPY)

Unit:mm(ftin)

(2)SK50SR-5(CAB)

2.3SPECIFICATIONSANDPERFORMANCE

SPEEDANDGRADEABILITY

ModelSK50SR-5

ApplicableMachinesPJ06-08890~

ShoeTypeRubbershoeIronshoe(OPT)

SlewingSpeedmin-1 {rpm}8.8{8.8}

TravelSpeedkm/h(mph)Low(1st)High(2nd)Low(1st)High(2nd)

Gradeability%(degree)58(30)

ENGINE

Model(YANMAR)4TNV88-BXYB(EDM-4TNV88)

TypeWater-cooled,4-cycletypeSwirlchambertypedieselengine Numberofcylinders-BoreStroke4-ø88mm90mm(3.46in3.54in)

TotalDisplacementL 2.189(134cuin)

OutputRatingkW/min-1 {PS/rpm}29.3/2,400{40/2,400}

MaximumTorque Nm/min-1 (lbfft/rpm)

131/1,440(97/1,440)

StartingMotorVkW122.3 GeneratorVA1255

HYDRAULICCOMPONENTS

HydraulicPumpVariabledisplacementaxialpiston+gearpump HydraulicMotorAxialpiston

HydraulicMotorw/Reducer(Travel)2-Axialpiston,2-Speedmotor ControlValve11-spoolmultiplecontrolvalve Cylinder(Boom,Arm,Swing,Bucket,Dozer)Doubleactioncylinder ReturnFilterSafetyvalvecontaining/FilterType(30)

SIDEDIGGING&DOZER

StrokeofDozer(above/below)mm(in)495/375(19.5/14.8)

WEIGHT

MachineWeightkg(lb) RubbershoeIronshoe 4,630(10,200)4,730(10,400)

Upperslewingbodykg(lb)2,280(5,030)

Travelsystemkg(lb)1,720(3,790)1,820(4,010)

Attachment (Boom+STDArm+STDBucket)kg(lb)535(1,180) Oil&Waterkg(lb)95(209)

Note:ThisfigureiscalculatedwithJapanesestandardbucket.

2.4MACHINE&COMPONENTSWEIGHT(DRY)

MODEL

Unit;kg(lb)

SK50SR-5

RUBBERSHOEIRONSHOE CANOPYCABCANOPYCAB

COMPLETEMACHINE4,630(10,200)4,770(10,500)4,730(10,400)4,870(10,700)

UPPERFRAMEASSEMBLY(ASSYOFFOLLOWINGS)2,280(5,030)2,420(5,340)2,280(5,030)2,420(5,340)

UPPERFRAME 544(1,200)

CANOPY/CAB 85(187)220(485)85(187)220(485)

ENGINE170(375)

HYDRAULICPUMP 35(77)

RADIATOR5(11)

HYDRAULICTANK 37(82)

FUELTANK4(9)

SWINGBRACKET 106(234)

SWINGCYLINDER 39(86)

GUARDBONNET 145(320)

BOOMCYLINDER 58(128)

LOWERFRAMEASSEMBLY(ASSYOFFOLLOWINGS)1,720(3,790)1,820(4,010) LOWERFRAME 545(1,200)

SLEWINGBEARING 76(168)

TRAVELMOTOR 652(1432)

UPPERROLLER 52(112) LOWERROLLER 910(2010) FRONTIDLER 422(932)

IDLERADJUSTER 302(662)

SPROCKET142(312)

RUBBERCRAWLERSHOE 2102 (4632)

400mm(15.7")IRONSHOE 2752 (6062)

SWIVELJOINT 22(49)

DOZER175(386)

DOZERCYLINDER 27(60)

ATTACHMENTASSEMBLY(ASSYOFFOLLOWINGS)535(1,180)

BOOMASSEMBLY 240(529) BOOM 165(364)

ARMCYLINDER 50(110)

ARMASSEMBLY 180(397)

ARM115(256)

BUCKETCYLINDER 27(60)

BUCKETLINK 13(29)

IDLERLINK42(92)

BUCKETASSEMBLY(STD)112(247)

FLUIDS(ASSYOFFOLLOWINGS)95(210)

HYDRAULICOIL 45(99)

FUEL44(97)

COOLANT6(13)

Note:BucketweightisshownwithJapanesestandardbucketweight.

2.5TRANSPORTATION

(1)LOADINGMACHINEONATRAILER

1)Keeptrailerbedclean.Putchocksagainsttruckwheels.

2)Usearamporloadingdeck.Rampsmustbestrongenough,havealowangle,andcorrectheight.Loadand unloadmachineonalevelsurface.

3)Travelmachineontorampsslowly.Centerthemachineoverthetrailer.

4)Lowerallattachment.

5)Stopengine.Removekeyfromswitch.

Donotputchainsoveroragainsthydrauliclinesorhoses.

6)Fastenmachinetotrailerwithchainsorcables.

Duringtransportation,thebucketorattachmentsmayhitthecanopyorthecab.Therefore,setthemachinein thetransportingpositionbyobservingfollowingpoints:

1.Extendthebucketcylinderfully.

2.Extendthearmcylinderfully.

3.Lowertheboom.

4.Ifmachinecannotbetransportedwitharmcylinderfullyextended,removebucketorattachmentandextend armcylinder.

(2)TRANSPORTATIONDIMENSIONANDWEIGHTOFATTACHMENT

1)BOOMWITHARMCYLINDER

ModelSK50SR-5

LHW

mm(ftin)

2,9101,040310

(9'6.6")(3'4.9")(12.2")

Weightw/Armcyl.kg(lb)240(529)

2)ARM&BUCKET(Japanesestandardbucket)

ModelSK50SR-5

2,770510650 (9'1.1")(20.1")(25.6")

Weightkg(lb)295(650)

3)ARM

ModelSK50SR-5

LHW mm(ftin)

2,010420250 (6'7.1")(16.5")(9.84")

Weightkg(lb)180(397)

4)BUCKET(Japanesestandardbucket)

ModelSK50SR-5

Heapedcapacitym3(cuyd)

LHW mm(in)

0.16(0.21)

780690650 (30.7")(27.2")(25.6")

Weightkg(lb)112(247)

5)DOZER w/ocylinderweight

ModelSK50SR-5

LHW mm(in)

1,1903201,960 (3'11")(12.6")(6'5.2")

Weightkg(lb)175(386)

2.6TYPEOFCRAWLERSHOES

TypeModel

Rubbershoe

Shoewidth mm(in)

TotalCrawler width mm(ftin)

Numberof Link

Groundpressure kPa(psi) CANOPYCAB

SK50SR-5400(15.7")1,970(6'5")7226(3.77)27(3.92)

Ironshoe(option)

SK50SR-5400(15.7")1,970(6'5")3826(3.77)27(3.92)

2.7TYPEOFBUCKET

TypeModel

Heaped capacity m3 (cu.yd)

Backhoebucket SK50SR-50.16(0.21)

Note:thistableshowsJapanesestandardbucket.

Outerwidthmm(in)Numberof tooth Weight kg(lb)

Remarks withside cutter without sidecutter

2.8ENGINESPECIFICATIONS

2.8.1SPECIFICATIONS

ModelSK50SR-5

EngineModel(YANMAR)4TNV88-BXYB(EDM-4TNV88)

TypeVertical,4-cyclewater-cooleddieselengine No.ofcylinders-BoreStroke4-88mm(3.46in)90mm(3.54in)

Totaldisplacement 2.189liter(134cuin)

Compressionratio19.1

Ratedoutput 29.3kW(40PS)at2400rpm

Maximumtorque 131~147.1Nm(97~109lbfft)at1440rpm

Lowidling1175±25rpm

Highidling2600±25rpm

Fuelconsumptionrate Lessthan242g/kWh(178g/PSh)

Allowabletiltingangles Continuous;30foralldirection

RotatingdirectionCounterclockwiseasseenfromflywheelside

Firingorder1-3-4-2-1

Fuelinjectiontiming(b.T.D.C.) 15.5±1

Fuelinjectionpressure 19.6MPa(2840psi)

Valveaction OpenClose

Intakevalveb.T.D.C.15±5a.B.D.C.45±5

Exhaustvalveb.T.D.C.56±5a.B.D.C.18±5

ValveclearanceIntakevalve0.2mm(0.008in)incoldcondition Exhaustvalve0.2mm(0.008in)incoldcondition

Thermostataction

Compressionpressure

Start71±1.5C(160±3F)/Fullopen85C(185F)

3.4±0.1MPa(500±14psi)at250rpm

Lubricationoilpressure0.44MPa(64psi)at2300rpm

DimensionsLWH 659523617mm(26.020.624.3in)

Dryweight170kg(375lb)

GovernorMechanicalcentrifugalgovernor(Allspeedtype)

Fuelfiltrationcartridgetypepaperfilter

LubricationsystemForcedlubricationwithtrochoidpump

CoolingsystemLiquidcooling/Radiator

Startercapacity12V2.3kW

Generatorcapacity12V55A

StartingaidGlowplug

Coolingwatercapacity:Max/Engine6.0/2.7liter(1.59/0.71gal)

Engineoilvolume:Max/Effective7.4/4.0liter(1.96/1.06gal)

2.8.2ENGINEPERFORMANCECURVE

SK50SR-5

Model:4TNV88-BXYB

RatedOutput:29.3kW/2400min-1 (40PS/2,400rpm)

Service Manual - Kobelco SK50SR-5 Hydraulic Excavator PJ06-08890

GENERALSAFETYINFORMATION

SAFETYPRECAUTIONS

NOTE:

1.OUTLINE

TABLEOFCONTENTS

1.1GENERALPRECAUTIONSFOR REPAIRS

DISASSEMBLING

1.1.2SAFETYINDISASSEMBLINGAND ASSEMBLING

1.1.3DISASSEMBLINGANDASSEMBLING HYDRAULICEQUIPMENT

1.1.4ELECTRICALEQUIPMENT

1.1.5HYDRAULICPARTS

1.1.6WELDINGREPAIR

1.1.7ENVIRONMENTALMEASURE

CONVERSIONSYSTEM (BasedonMARKSSTANDARD HANDBOOKFOR MECHANICALENGINEERS)

2.SPECIFICATIONS

TABLEOFCONTENTS

2.2MACHINEDIMENSIONS

2.4MACHINE&COMPONENTSWEIGHT(DRY)

2.5TRANSPORTATION

2.6TYPEOFCRAWLERSHOES

2.7TYPEOFBUCKET

[MEMO]

3.ATTACHMENTDIMENSIONS

TABLEOFCONTENTS

Service Manual - Kobelco SK50SR-5 Hydraulic Excavator PJ06-08890

GENERALSAFETYINFORMATION

SAFETYPRECAUTIONS

NOTE:

1.OUTLINE

TABLEOFCONTENTS

1.1GENERALPRECAUTIONSFOR REPAIRS

DISASSEMBLING

1.1.2SAFETYINDISASSEMBLINGAND ASSEMBLING

1.1.3DISASSEMBLINGANDASSEMBLING HYDRAULICEQUIPMENT

1.1.4ELECTRICALEQUIPMENT

1.1.5HYDRAULICPARTS

1.1.6WELDINGREPAIR

1.1.7ENVIRONMENTALMEASURE

CONVERSIONSYSTEM (BasedonMARKSSTANDARD HANDBOOKFOR MECHANICALENGINEERS)

2.SPECIFICATIONS

TABLEOFCONTENTS

2.2MACHINEDIMENSIONS

2.4MACHINE&COMPONENTSWEIGHT(DRY)

2.5TRANSPORTATION

2.6TYPEOFCRAWLERSHOES

2.7TYPEOFBUCKET

[MEMO]

3.ATTACHMENTDIMENSIONS

TABLEOFCONTENTS

CONVERSIONSYSTEM (BasedonMARKSSTANDARD HANDBOOKFOR MECHANICALENGINEERS)