Case CX750D User manual

Part number 51408165
English
October 2017
SERVICE MANUAL
CX750D
Crawler Excavator
Printedin U.S.A.
© 2017 CNH Industrial Italia S.p.A. All Rights Reserved.
Case is a trademark registered in the United States and many
other countries, owned or licensed to CNH Industrial N.V.,
its subsidiaries or affiliates.
https://caseihservicemanual.com

SERVICEMANUAL
CX750DCrawlerexcavatorsRTCMassexcavatorversion(TIER4FINAL)
-NAMarket
CX750DCrawlerexcavatorsRTCversion(TIER4FINAL)-NAMarket
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Contents
INTRODUCTION
Machinecompletionandequipment..............................................05
[05.200]Productshipment..................................................................05.1
Engine.......................................................................................10
[10.001]Engineandcrankcase.............................................................10.1
[10.102]Panandcovers....................................................................10.2
[10.106]Valvedriveandgears..............................................................10.3
[10.101]Cylinderheads.....................................................................10.4
[10.105]Connectingrodsandpistons.......................................................10.5
[10.103]Crankshaftandywheel............................................................10.6
[10.216]Fueltanks..........................................................................10.7
[10.206]Fuellters..........................................................................10.8
[10.218]Fuelinjectionsystem...............................................................10.9
[10.202]Aircleanersandlines............................................................10.10
[10.250]Turbochargerandlines...........................................................10.11
[10.254]Intakeandexhaustmanifoldsandmufer.......................................10.12
[10.500]SelectiveCatalyticReduction(SCR)exhausttreatment.........................10.13
[10.501]ExhaustGasRecirculation(EGR)exhausttreatment............................10.14
[10.400]Enginecoolingsystem...........................................................10.15
[10.414]Fananddrive....................................................................10.16
[10.310]Aftercooler........................................................................10.17
[10.304]Enginelubricationsystem........................................................10.18
[10.408]Oilcoolerandlines...............................................................10.19
Hydraulicsystems.......................................................................35
[35.000]Hydraulicsystems..................................................................35.1
[35.300]Reservoir,cooler,andlters........................................................35.2
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[35.106]Variabledisplacementpump.......................................................35.3
[35.102]Pumpcontrolvalves................................................................35.4
[35.359]Maincontrolvalve..................................................................35.5
[35.357]Pilotsystem........................................................................35.6
[35.820]Hydraulicdrivencoolingfans......................................................35.7
[35.355]Hydraulichandcontrol.............................................................35.8
[35.356]Hydraulicfootcontrol...............................................................35.9
[35.352]Hydraulicswingsystem..........................................................35.10
[35.353]Hydraulictravelsystem..........................................................35.11
[35.354]Hydrauliccentraljoint............................................................35.12
[35.736]Boomhydraulicsystem..........................................................35.13
[35.737]Dipperhydraulicsystem..........................................................35.14
[35.738]Excavatorandbackhoebuckethydraulicsystem................................35.15
Framesandballasting.................................................................39
[39.140]Ballastsandsupports..............................................................39.1
Tracksandtracksuspension........................................................48
[48.130]Trackframeanddrivingwheels....................................................48.1
[48.100]Tracks..............................................................................48.2
[48.134]Tracktensionunits.................................................................48.3
[48.138]Trackrollers........................................................................48.4
Cabclimatecontrol.....................................................................50
[50.100]Heating.............................................................................50.1
[50.200]Airconditioning.....................................................................50.2
Electricalsystems.......................................................................55
[55.000]Electricalsystem...................................................................55.1
[55.100]Harnessesandconnectors.........................................................55.2
[55.525]Cabenginecontrols................................................................55.3
[55.015]Enginecontrolsystem..............................................................55.4
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[55.201]Enginestartingsystem.............................................................55.5
[55.301]Alternator...........................................................................55.6
[55.302]Battery..............................................................................55.7
[55.202]Coldstartaid.......................................................................55.8
[55.011]Fueltanksystem...................................................................55.9
[55.010]Fuelinjectionsystem.............................................................55.10
[55.014]Engineintakeandexhaustsystem...............................................55.11
[55.988]SelectiveCatalyticReduction(SCR)electricalsystem..........................55.12
[55.989]ExhaustGasRecirculation(EGR)electricalsystem.............................55.13
[55.012]Enginecoolingsystem...........................................................55.14
[55.013]Engineoilsystem................................................................55.15
[55.640]Electronicmodules...............................................................55.16
[55.512]Cabcontrols......................................................................55.17
[55.036]Hydraulicsystemcontrol.........................................................55.18
[55.051]CabHeating,Ventilation,andAir-Conditioning(HVAC)controls.................55.19
[55.050]Heating,Ventilation,andAir-Conditioning(HVAC)controlsystem...............55.20
[55.524]Cabcontrols(Liftarm,Boom,Dipper,Bucket)...................................55.21
[55.416]Swingcontrolsystem............................................................55.22
[55.417]Travelcontrolsystem............................................................55.23
[55.530]Camera...........................................................................55.24
[55.518]Wiperandwashersystem........................................................55.25
[55.404]Externallighting..................................................................55.26
[55.514]Cablighting......................................................................55.27
[55.408]Warningindicators,alarms,andinstruments....................................55.28
[55.992]Anti-theftsystem.................................................................55.29
[55.DTC]FAULTCODES..................................................................55.30
Booms,dippers,andbuckets.......................................................84
[84.910]Boom...............................................................................84.1
[84.912]Dipperarm.........................................................................84.2
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[84.100]Bucket..............................................................................84.3
Platform,cab,bodywork,anddecals.............................................90
[90.150]Cab.................................................................................90.1
[90.156]Cabwindshieldandwindows......................................................90.2
[90.118]Protectionsandfootboards.........................................................90.3
[90.120]Mechanically-adjustedoperatorseat...............................................90.4
[90.100]Enginehoodandpanels...........................................................90.5
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INTRODUCTION
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Contents
INTRODUCTION
Foreword-Importantnoticeregardingequipmentservicing....................................3
Safetyrules.....................................................................................4
Safetyrules-Generalinformation..............................................................5
Safetyrules-Personalsafety..................................................................6
Safetyrules-Cabprotectivestructure..........................................................8
Safetyrules-Ecologyandtheenvironment....................................................9
Torque-Boltandnut..........................................................................10
Torque-Specialtorquesetting...............................................................11
Basicinstructions-Shopandassembly......................................................15
Hydrauliccontamination......................................................................17
Generalspecication(*)......................................................................18
Generalspecication(*)......................................................................23
Generalspecication-Mainequipment......................................................27
Weight(*).....................................................................................39
Weight(*).....................................................................................41
Dimension(*).................................................................................43
Dimension(*).................................................................................47
Fluidsandlubricants..........................................................................48
Conversionfactors............................................................................51
Abbreviation..................................................................................63
Productidentication..........................................................................66
Productidentication-Machineorientation..................................................69
(*)Seecontentforspecicmodels
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INTRODUCTION
Foreword-Importantnoticeregardingequipmentservicing
Allrepairandmaintenanceworklistedinthismanualmustbecarriedoutonlybyqualieddealershippersonnel,
strictlycomplyingwiththeinstructionsgiven,andusing,wheneverpossible,thespecialtools.
Anyonewhoperformsrepairandmaintenanceoperationswithoutcomplyingwiththeproceduresprovidedherein
shallberesponsibleforanysubsequentdamages.
Themanufacturerandalltheorganizationsofitsdistributionchain,including-withoutlimitation-national,regional,or
localdealers,rejectanyresponsibilityfordamagescausedbypartsand/orcomponentsnotapprovedbythemanu-
facturer,includingthoseusedfortheservicingorrepairoftheproductmanufacturedormarketedbythemanufacturer.
Inanycase,nowarrantyisgivenorattributedontheproductmanufacturedormarketedbythemanufacturerincase
ofdamagescausedbypartsand/orcomponentsnotapprovedbythemanufacturer.
Themanufacturerreservestherighttomakeimprovementsindesignandchangesinspecicationsatanytimewithout
noticeandwithoutincurringanyobligationtoinstallthemonunitspreviouslysold.Specications,descriptions,and
illustrativematerialhereinareasaccurateasknownattimeofpublicationbutaresubjecttochangewithoutnotice.
Incaseofquestions,refertoyourCASECONSTRUCTIONSalesandServiceNetworks.
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INTRODUCTION
Safetyrules
Personalsafety
Thisisthesafetyalertsymbol.Itisusedtoalertyoutopotentialpersonalinjuryhazards.Obeyall
safetymessagesthatfollowthissymboltoavoidpossibledeathorinjury.
ThroughoutthismanualyouwillndthesignalwordsDANGER,WARNING,andCAUTIONfollowedbyspecialin-
structions.Theseprecautionsareintendedforthepersonalsafetyofyouandthoseworkingwithyou.
Readandunderstandallthesafetymessagesinthismanualbeforeyouoperateorservicethemachine.
DANGERindicatesahazardoussituationthat,ifnotavoided,willresultindeathorseriousinjury.
WARNINGindicatesahazardoussituationthat,ifnotavoided,couldresultindeathorseriousinjury.
CAUTIONindicatesahazardoussituationthat,ifnotavoided,couldresultinminorormoderateinjury.
FAILURETOFOLLOWDANGER,WARNING,ANDCAUTIONMESSAGESCOULDRESULT
INDEATHORSERIOUSINJURY .
Machinesafety
NOTICE:Noticeindicatesasituationthat,ifnotavoided,couldresultinmachineorpropertydamage.
ThroughoutthismanualyouwillndthesignalwordNoticefollowedbyspecialinstructionstopreventmachineor
propertydamage.ThewordNoticeisusedtoaddresspracticesnotrelatedtopersonalsafety.
Information
NOTE:Noteindicatesadditionalinformationthatclariessteps,procedures,orotherinformationinthismanual.
ThroughoutthismanualyouwillndthewordNotefollowedbyadditionalinformationaboutastep,procedure,or
otherinformationinthemanual.ThewordNoteisnotintendedtoaddresspersonalsafetyorpropertydamage.
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INTRODUCTION
Safetyrules-Generalinformation
Cleaning
Cleanthemetalpartswithcleaningsolutionthatmeetsthestandardandsteamcleaning.(exceptforbearings)
Aftercleaning,drywell,andinjectoilinallparts.
Alsoinjectoilintothebearingsafterdrying.
Inspection
Whendisassemblingparts,checkalltheparts.
Ifthereareanywornordamagedparts,replacethem.
Inspectcarefullytopreventinitialbreakdowns.
Bearing
Replaceanyloosebearings.
Airdrybearingsbeforeinstallingthem.
Needlebearing
Wheninsertingneedlebearings,beverycarefulnottodamagethem.
Applygreasetothesectionwheretheneedlebearingwillbeinserted.
Gear
Checkthatthereisnowearandnodamage.
Oilseal,O-ring,gasket
Alwaysinstallnewoilseals,O-rings,andgaskets.
ApplygreasetosectionswhereoilsealsandO-ringswillbeinserted.
Shaft
Checkthatthereisnowearandnodamage.
Checkthebearingsandcheckfordamagedoilsealsontheshaft.
Serviceparts
InstallCASECONSTRUCTIONgenuineserviceparts.
Whenplacinganorder,checkthepartscatalog.ItcontainstheCASECONSTRUCTIONgenuinepartnumbers.
Anybreakdownsarisingfromtheinstallationofnon-genuinepartsarenotcoveredbythewarranty.
Lubricants(fuel,hydraulicoil)
Usetheoilfromthespeciedcompanyorspeciedintheoperator'smanualorserviceManual.
Anybreakdownsarisingfromanyfuelorhydraulicoilotherthanthosespeciedarenotcoveredbythewarranty.
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INTRODUCTION
Safetyrules-Personalsafety
WARNING:
Thissymbolindicatesaprecaution.
Itgivesinformationconcerningthesafetyoftheoperatorandthoseinthesurroundings.
Readandunderstandtheseprecautionsthoroughlybeforeperformingthework.
Alwayscomplywithwarningsandprecautionssoastoavoidanyaccidents.
Thissectioncoversinformationrelatedtooverallsafety.
Checkwhetherallwarninglabelsareinplace.
AdditionallabelscanbeorderedfromServiceParts.
WARNING:
Readtheoperator'smanualtogainathoroughunderstandingofmachinecontroloperations.
WARNING:
Performanymachineoperationsfromtheseatingposition.
Anyothermethodmaycausesevereinjuries.
WARNING:
Onlytheoneoperatoristorideonthemachine.Nooneelseistorideonit.
WARNING:
Checkthesafetymessagesintheoperator'smanualbeforestartingtheengine.
Checkallthewarninglabelsonthemachine.
Checkthatnooneiswithinthemachine’soperatingrange.
Checktheoperatingmethodsinasafelocationbeforestartingtheactualwork.
Understandthemachineoperationswell,thenoperateincompliancewithallservice-relatedlawsandregulations.
Theoperator'smanualcanbepurchasedatyourCASECONSTRUCTIONdealer.
WARNING:
Workingwithsloppyclothesorclotheswithwhichsafetycannotbeensuredleadstodamagetothemachine
andinjurytotheoperator.
Alwayswearclothesthatensuressafety.
Inordertoworkmoresafely,itisrecommendedtowearadditionalsafetyequipment.
Helmet,safetyshoes,earprotection,goggles,workclothes,andgloves
WARNING:
Paycarefulattentionwhenworkingwiththeenginerunning.
WARNING:
Checkhydraulicequipment.
Workaccordingtotheprocedure.
Donotchangetheprocedure.
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INTRODUCTION
WARNING:
Checkthatthereisnooneinthesurroundingsbeforedrainingthepressurefromhydrauliccircuitsduring
machinehydrauliccylinderinspection.
WARNING:
Usegloveswhenhandlinghigh-temperatureparts.
WARNING:
Bringthelowerpartsorattachmentsincontactwiththegroundbeforeinspectingorrepairingthem.
WARNING:
Checkthathosesandtubesaresecurelyconnected.
Ifthereisanydamagetoahoseortube,replaceit.
Donotcheckforoilleaksbyhand.Usecardboardorwood.
WARNING:
Whenremovinganattachmentpinorotherhardenedpin,useahammerthathasasofthead.
WARNING:
Weareyeprotectionwhenusingahammertoinstallapinorwhenworkingwithagrinder.
Atthistime,usegogglesoreyeprotectorsthatmeetstandards.
WARNING:
Parkthemachineinasafelocationwhenrepairingorinspectingit.
WARNING:
Useworksiteprotectionwhenrepairingthemachine.
Checktheoil,coolant,grease,andtools.
Recovermaterialsandpartsasnecessary.
Payenoughattentiontosafety.
WARNING:
Someofthemachine'spartsareextremelyheavy.
Useanappropriateliftingequipmentforsuchparts.
Forweightsandprocedures,seetheServiceManual.
WARNING:
Exhaustgasesaretoxic.
Alwaysprovidegoodventilationwhenworkingindoorsorinanyotherenclosedspace.
WARNING:
Iftheelectrolyticbatterysolutionfreezes,itmayexplode.
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INTRODUCTION
Safetyrules-Cabprotectivestructure
Cabprotectivestructure
Modifyingthecabmaincomponentsisprohibitedinordertoprotecttheoperator.
Prohibiteditems
•Modicationthatreducesthestrengthoftheplatformonwhichtheprotectionstructurecabismounted.Activityand
modicationthatreducesthefunctionofthecaulkinganchoratleftbackofthecab.
•Modicationthataffectsthemainstrengthoftheprotectionstructurecab.
Modicationsprohibited(redpart)Allchanges(grinding,welding,drilling,removal...etc.)are
prohibited.
Authorizationforconditionalmodication(white
part)
Removalofpartisprohibited.Drillingispossiblebyperforming
drillingandweldingofbar(limitedtodiameterof20mm
(0.787in)).
Theirregularlyshapedsteellinealsocontainsreinforcements.
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INTRODUCTION
Safetyrules-Ecologyandtheenvironment
Soil,air,andwaterqualityisimportantforallindustriesandlifeingeneral.Whenlegislationdoesnotyetrulethe
treatmentofsomeofthesubstancesthatadvancedtechnologyrequires,soundjudgmentshouldgoverntheuseand
disposalofproductsofachemicalandpetrochemicalnature.
Familiarizeyourselfwiththerelativelegislationapplicabletoyourcountry,andmakesurethatyouunderstandthis
legislation.Wherenolegislationexists,obtaininformationfromsuppliersofoils,lters,batteries,fuels,anti-freeze,
cleaningagents,etc.,withregardtotheeffectofthesesubstancesonmanandnatureandhowtosafelystore,use,
anddisposeofthesesubstances.
Helpfulhints
•Avoidtheuseofcansorotherinappropriatepressurizedfueldeliverysystemstolltanks.Suchdeliverysystems
maycauseconsiderablespillage.
•Ingeneral,avoidskincontactwithallfuels,oils,acids,solvents,etc.Mostoftheseproductscontainsubstances
thatmaybeharmfultoyourhealth.
•Modernoilscontainadditives.Donotburncontaminatedfuelsandorwasteoilsinordinaryheatingsystems.
•Avoidspillagewhenyoudrainuidssuchasusedenginecoolantmixtures,engineoil,hydraulicuid,brakeuid,
etc.Donotmixdrainedbrakeuidsorfuelswithlubricants.Storealldraineduidssafelyuntilyoucandisposeof
theuidsinaproperwaythatcomplieswithalllocallegislationandavailableresources.
•Donotallowcoolantmixturestogetintothesoil.Collectanddisposeofcoolantmixturesproperly.
•Theair-conditioningsystemcontainsgasesthatshouldnotbereleasedintotheatmosphere.Consultanair-condi-
tioningspecialistoruseaspecialextractortorechargethesystemproperly.
•Repairanyleaksordefectsintheenginecoolingsystemorhydraulicsystemimmediately.
•Donotincreasethepressureinapressurizedcircuitasthismayleadtoacomponentfailure.
•Protecthosesduringwelding.Penetratingweldsplattermayburnaholeorweakenhoses,allowingthelossofoils,
coolant,etc.
Batteryrecycling
Batteriesandelectricaccumulatorscontainseveralsubstancesthatcanhaveaharmful
effectontheenvironmentifthebatteriesarenotproperlyrecycledafteruse.Improper
disposalofbatteriescancontaminatethesoil,groundwater,andwaterways.CASE
CONSTRUCTIONstronglyrecommendsthatyoureturnallusedbatteriestoaCASE
CONSTRUCTIONdealer,whowilldisposeoftheusedbatteriesorrecycletheused
batteriesproperly.Insomecountries,thisisalegalrequirement.
Mandatorybatteryrecycling
NOTE:ThefollowingrequirementsaremandatoryinBrazil.
Batteriesaremadeofleadplatesandasulfuricacidsolution.Becausebatteriescontainheavymetalssuchaslead,
CONAMAResolution401/2008requiresyoutoreturnallusedbatteriestothebatterydealerwhenyoureplaceany
batteries.Donotdisposeofbatteriesinyourhouseholdgarbage.
Pointsofsaleareobligedto:
•Acceptthereturnofyourusedbatteries
•Storethereturnedbatteriesinasuitablelocation
•Sendthereturnedbatteriestothebatterymanufacturerforrecycling
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INTRODUCTION
Torque-Boltandnut
•Tightenalternatingbetweenleftandrightandtopandbottomsothatuniformtighteningforceisapplied.
LPIL12CX00005EA1
•IfLOCTITE®wasusedonaremovedbolt(thereissomethingwhitestickingtotheboltwhenitisremoved),cleanthe
oldLOCTITE®offwithcleaninguid,drythebolt,thenapply2-3dropsofLOCTITE®tothethreadsectionofthebolt.
Torquetable
Boltnominal
diameter(size)M6M8M10M12M14M16M18M20
Wrench10mm13mm17mm19mm22mm24mm27mm30mm
Hexagon
boltTighten-
ingtorque
6.9N·m
(5.089lb
ft)
19.6N·m
(14.456lb
ft)
39.2N·m
(28.912lb
ft)
58.8N·m
(43.369lb
ft)
98.1N·m
(72.355lb
ft)
156.9N·
m(115.72
3lbft)
196.1N·
m(144.63
6lbft)
294.2N·
m(216.99
1lbft)
Wrench5mm6mm8mm10mm12mm14mm14mm17mm
Hexagon
socket
headbolt
Tighten-
ingtorque
8.8N·m
(6.491lb
ft)
21.6N·m
(15.931lb
ft)
42.1N·m
(31.051lb
ft)
78.5N·m
(57.899lb
ft)
117.7N·m
(86.811lb
ft)
176.5N·
m(130.18
0lbft)
245.2N·
m(180.85
0lbft)
343.2N·
m(253.13
1lbft)
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INTRODUCTION
Torque-Specialtorquesetting
CodeRetighteninglocationBoltnominal
diameterWrenchTighteningtorque
1*TravelmotorM2436mm901–1052N·m(664.54–775.92lbft)
2*DrivesprocketM2436mm901–1052N·m(664.54–775.92lbft)
3Take-uprollerM2030mm580–620N·m(427.79–457.29lbft)
4*UpperrollerM3046mm1781–2078N·m(1313.60–1532.65lbft)
5*LowerrollerM3046mm1781–2078N·m(1313.60–1532.65lbft)
6*TrackguardM3046mm1668–1962N·m(1230.25–1447.10lbft)
7ShoeM2741mm1765–2157N·m(1301.80–1590.92lbft)
8CounterweightM4265mm2256–2550N·m(1663.94–1880.78lbft)
9*LowerframeM3046mm1460–1700N·m(1076.84–1253.86lbft)
10*
Turntable
bearingSwingframeM3046mm1460–1700N·m(1076.84–1253.86lbft)
11*SwingunitM2436mm900–1050N·m(663.81–774.44lbft)
12*Enginemount
(front)M2436mm902–1049N·m(665.28–773.70lbft)
13*Enginemount
(rear)M2436mm902–1049N·m(665.28–773.70lbft)
14*
Engine
FrontbracketM1422mm173–202N·m(127.60–148.99lbft)
15*RadiatorM1624mm147.2–176.6N·m(108.6–130.3lbft)
16*FlangeM1219mm88–108N·m(64.91–79.66lbft)
17*
Hydraulic
pumpPumpM24
19mm
hexagon
socket
head
667–902N·m(491.95–665.28lbft)
18*HydraulictankM2030mm470.4–568.4N·m(346.95–419.23lbft)
19*FueltankM2030mm470.4–568.4N·m(346.95–419.23lbft)
20*UreatankM1624mm232.4–276N·m(171.41–203.57lbft)
21*ControlvalveM2030mm343–392N·m(252.98–289.12lbft)
22*SwingframeM1624mm267–312N·m(196.93–230.12lbft)
23*
Center
JointLowerframeM1219mm109–127N·m(80.39–93.67lbft)
24CabM1624mm149–173N·m(109.90–127.60lbft)
25BatteryM1017mm19.6–29.4N·m(14.46–21.68lbft)
NOTICE:AlwaysapplyLOCTITE®262™orequivalenttothelocationswithmark*andtightenthemwiththespecied
torque.
Tighteningtorque:9.8N·m(7.23lbft)
Tightenboltsandnutsthatarenotspeciedintheabovetable,asfollows:
Nominalbolt
diameter(Size)M6M8M10M12M14M16M18M20
Wrench10mm
(0.394in)
13mm
(0.512in)
17mm
(0.669in)
19mm
(0.748in)
22mm
(0.866in)
24mm
(0.945in)
27mm
(1.063in)
30mm
(1.181in)
Hexagon
boltTighten-
ingtorque
6.9N·m
(5.09lbft)
19.6N·m
(14.46lb
ft)
39.2N·m
(28.91lb
ft)
58.8N·m
(43.37lb
ft)
98.1N·m
(72.35lb
ft)
156.
9N·m
(115.72lb
ft)
196.
1N·m
(144.64lb
ft)
294.
2N·m
(216.99lb
ft)
Wrench5mm
(0.197in)
6mm
(0.236in)
8mm
(0.315in)
10mm
(0.394in)
12mm
(0.472in)
14mm
(0.551in)
14mm
(0.551in)
17mm
(0.669in)
Hexagon
socket
headboltTighten-
ingtorque
8.8N·m
(6.49lbft)
21.6N·m
(15.93lb
ft)
42.1N·m
(31.05lb
ft)
78.5N·m
(57.90lb
ft)
117.7N·m
(86.81lb
ft)
176.
5N·m
(130.18lb
ft)
245.
2N·m
(180.85lb
ft)
343.
2N·m
(253.13lb
ft)
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INTRODUCTION
SMIL16CEX2719H1
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INTRODUCTION
SMIL16CEX2720G2
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