NEW HOLLAND
REPAIRMANUAL--TCSERIESTRACTORS
GENERALINFORMATION
DESCRIPTIONANDOPERATION
Thissectiondescribestheengineoverhauland repairproceduresoftheModelsTC18Dand TC21Dtractors.Repairproceduresare essentiallythesameforallmodelsexceptas notedintherepairprocedures.
Thetractorsareequippedwiththree-cylinder in-lineengines.Theyareallfourcycle,overhead valve,liquidcooledengines.Theenginesare identifiedbyacodecastintothelowerrightside ofthecylinderblock,justbehindthehydraulic pump.Theidentificationnumbersoftheengines usedisshowninthefollowingchart.
IDENTIFICATIONCHART
CYLINDERHEADANDVALVETRAIN COMPONENTS
Thecylinderheadincorporatesthevalve assemblies,rockerarms,rockershaft,push rods,lifters,andpre-combustionchambers.The airintakemanifoldisincorporatedintotheleft handsideofthevalvecoverassembly.The exhaustmanifoldisboltedontheleft-handsideof thecylinderhead.Thecylinderheadshave integralvalveguides.Standardsizevalvesonly areused.Figure2providesacut-awayfrontand sideviewofanengine.
Apre-combustionchamberislocatedbetween theinjectorassemblyandthecombustion chamberofthecylinderandprovidesanareafor initialignitionofthefuelforimprovedstarting.A glowpluglocatedintheheadextendsintothe pre-combustionchamberand,whenenergized, pre-heatsthefuel-airmixtureforimprovedfuel ignitionundercoldweatherconditions. S753 954cc
CYLINDERBLOCKASSEMBLY
Thecylinderblockassemblycontainsthe pistons,connectingrods,crankshaft,timing gears,andengineoilpump.Theengine crankshaftissupportedbyfourmainbearings. Thefrontmainbearingisafullcirclebearing positionedinaboreinthefrontoftheblock.The
second,third,andfourthmainbearingsaresplit linerslocatedinholdersboltedtotheblock.The camshaftissupportedbytwoballbearingsone locatedoneachendoftheblock.Theengines utilizeastraightconnectingrodandathreering piston.
ENGINEOVERHAUL
ENGINEDISASSEMBLY
1.Opentheradiatordrain,1,anddrainand removetheradiatorassembly.See“Radiator Removal”discussedlaterinthissection, Page55.
2.Disconnecttheelectricalconnector,1,forthe headlamps.
3.Removetheclippin,1,fromthehood support,2,andgraduallylowerthehood.
604.55.071.00 --02--2000
4.Pulltheinstrumentpaneloutbyhandand removetheclippins,1,fromthehoodhinge pins,2.Thenremovethehingepins.
5.Raisethehoodandremovefromthetractor.
6.Removethewholeaircleanerassembly,1, alongwiththeaircleanerhoses.
7.Removethetwocapscrews,1,andremove theaircleanermountingbracket,2.
8.Removetheexhaustmufflerandmanifold assembly,1.
FUELINJECTORANDGLOWPLUG REMOVAL
1.Cleanalldirtandoilfromtheinjectorsand surroundingareas.
2.Disconnectthefuellines,1,fromthe injectorsandcapallopenings.
3.Removethethreeglowplugs,2.
4.Disconnectthereturnlinetothefueltank fromthenumberthreeinjector.
5.Removetheinjectorassemblies,3.
NOTE:Besuretoremovetheinjector sealingwasherfromtheinjectorbore,if notremovedwiththeinjector.
OILPRESSURESWITCHREMOVAL
1.Disconnectandremovetheoilpressure switch,1.
TEMPERATURESENDINGSWITCHAND ALTERNATORREMOVAL
1.Removethetemperaturesendingswitch,1, fromthefrontofthecylinderhead.
2.Loosenthealternatormountingbolts,2,and removetheV-belt,3,fromthedrivepulley.
3.Disconnectthewiresfromthebackofthe alternator.
4.Removethealternatormountingboltsand removethealternator,4.
FAN,WATERPUMP,ANDEXTERNALOIL TUBEREMOVAL
1.Removethefanandwaterpumpassembly. See“WaterPumpandThermostatRemoval” discussedlaterinthissection,page57.
2.Removetheexternaloiltransfertubebanjo bolts,1,fromthefrontofthecylinderhead andthesideofthecylinderblockandremove theexternaloiltransfertube.
VALVECOVERREMOVAL
1.Removethevalvecover,1,andgasket.
ROCKERSHAFTANDPUSHROD REMOVAL
1.Removethevalverockerarms,1,shaft,2, rockerarmsupports,3,andsprings,4,asan assembly
2.Removethepushrods,5.
NOTE:Besuretokeepthevalve componentsinseparatelymarked containersforre-assemblyintheir originalposition.
CYLINDERHEADREMOVAL
1.Toremovethecylinderhead,removethe cylinderheadbolts,1,byalternately looseningahalfturnatatimetoprevent warpingthehead.
VALVETAPPETREMOVAL
1.Removethevalvetappets,1,fromthe machinedboreinthecylinderblock.
NOTE:Besuretokeepthevalve componentsinseparatelymarked containersforre-assemblyintheir originalposition.
FUELSHUT-OFFSOLENOIDREMOVAL
1.Removethewireconnector,1,andunscrew thefuelshut-offsolenoid,2.
ENGINETIMINGGEARCOVER,TIMING GEARS,ANDCAMSHAFT
1.Draintheenginecrankcaseoilintoasuitable container.
2.Removethenut,1,andwasher,2,and removethepulley,3,fromthecrankshaft,4.
3.Disconnectthethrottlecontrolcablefromthe governorlever,3,Figure18.
4.Removetheinjectionpumpmountingbolts andraisetheinjectionpumpenoughto removethespringpin,1,andseparatethe governorlinkfromthecontrolrack.
5.Ifequipped,removethepowersteering pumpreservoirtankdipstick-fillercap,1. Removethereservoirdrainplug,2,fromthe bottomofthereservoir,anddrainthefluidout ofthereservoirtank,3,intoasuitable container.
6.Loosenthehoseclamp,4,onthesuction tubeanddisconnectthehosefromthe suctiontube.
7.Removethepressuretube,5,fromthe enginesideofthesteeringpump.
8.Removethethroughbolts,6,andremovethe steeringpumpfromthefrontcover.Capand plugalllinesandopenings.
9.Removetheretainingbolts,1,andliftthe frontcover,2,andgasket,3,offthelocating dowels.
TimingGearsandCamshaftRemoval
1.Removetheretainingring,1,andremovethe idlergearandoilpumpassembly,2.
2.Removethetwoboltssecuringthekeeper plate,1.Oneboltmustbeaccessedusing theaccesshole,2,inthecamgear.
3.Slidethecamshaftandgearoutofthe camshaftbore.
OilSumpRemoval
1.Removetheoilsumpretainerbolts,1.
2.Removetheoilsumpanddiscardgasket.
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