8/10/2015
Tractorpartsandattachments:AG150/AG250PowershiftgearboxCreeper
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Tractorpartsandattachments
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AMNELES
Descriptionandapplicationoftractorsparepartsandcomponents.MasseyFerguson,JohnDeere,CaseIH.
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Tractorsplit
AG150/AG250PowershiftgearboxCreeper
TractorsfittedwithanAG150orAG250Powershiftgearboxmaybefitted,accordingtooptions,with
acreeper.Thisreducerunit(24)comprisesasimpleepicyclicalgeartrainhavingaplanetary
carrierandcrownwheelmountedatthefrontoftheintermediatehousing(19).
Itiscontrolledbyaleverontherighthandsideconsoleinthecabthatislinkedviaacabletoa
linkfittedonthefrontrighthandsideoftheintermediatehousing.Thislinkmovesthecoupler
controlfork.Thecoupler,fittedwithstraightteeth,mustonlybeengagedwhenthetractoris
stationary.
Operation
Thecoupler(29)isintegralviasplineswiththelayshaft(30).Themovingofthecontrollevertothe
"Snail"positionmovesthecouplerrearwardsandlocksittotheplanetarycarrier(20)viacoupler
ring(22).Thespeedoftheoutputshaftis1/4ofthatoftheinputshaft.
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layshaftandpermitsadifferenceinrotationoftheshaftswheninthe"Creeper"position.
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Specifications
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Tractorpartsandattachments:AG150/AG250PowershiftgearboxCreeper
JCBTractor2155
specification
CASE105UFarmall
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specification
CASE120AFarmall
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JCBTractor7200
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CASE125Puma
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specification
CASE70Farmall
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Partslist
(1)Snapring(2)Connectingshaft(3)Bolts(4)Sleeve(5)Support(6)Snapring(7)Bearing
carrier(8)Circlip(9)Circlip(10)Ballbearing(11)Snapring(12)Frictionwasher(13)Pin(14)
Frictionplates(15)Sungears(16)Crownwheel(17)Spacers(18)Rollerbearings(19)Intermediate
housing
(20)Planetarycarrier(21)Snapring(22)Couplerring(23)Bolts(24)Planetarycarrierassembly
(reducergear)(25)Locatingpin(26)Nut(27)Fork(28)Guiderod(29)Coupler(30)Layshaft(31)
Snapring(32)Sleeve(33)Snapring(34)Needlebearing(35)Lockingstud(36)Spring(37)Plug
(38)Pin
(39)Finger(40)Oring(41)Pin(42)Link(43)Bolt(44)Housing(45)Shim(s)
Removingandrefittingtheunit
Uncouplethetractorbetweenthegearboxandtheintermediatehousing.
Removethesleeve(4).Removebolts(3).Removetheshaft(2)andunit(24)assembly.The
locatingpins(25)areforcefittedintotheintermediatehousing(19).Checkforthepresenceofthe
locatingpinsontheintermediatehousing.
Screwtwoguidestudsofsuitablelengthintheplaceoftwobolts(3).
Placecoupler(29)incontactwithsnapring(31).Refitshaft(2)andunit(24)assemblyturningthe
machinedrecess"E"onsupport(5)towardsthe
adjustingnut(26)onguiderod(28).Turnshaft(2)severalturnstoengagetheexteriorsplines
ofcouplerring(22)inthoseofcoupler(29).
Alternatelyanduniformlytightenbolts(3)lightlysmearedwithLoctite241toatorqueof90120
Nm.Couplethetractorbetweenthegearboxandtheintermediatehousing.
Disassembling,reassemblingandadjustingtheselectionmechanism
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Tractorpartsandattachments:AG150/AG250PowershiftgearboxCreeper
Removeunit(24).Disconnectthecontrolcablefittedtolink(42).
Disassembly
Removeplug(37).Recoverspring(36)andlockingstud(35).
RemovetheAllenscrew(43).Removethelink(42)andpin(41)fittedwithseal(40)andfinger
(39).Recovertheshim(s)(45).Driveoutpin(38)linkingthepinandthefinger.Disengagethe
guiderod(28)fromthefork(27)andtheintermediatehousing(19).Ifnecessary,loosen,unscrew
anddiscardnut(26).Removethefork,couplerandshaft(30)fittedwithneedlebearing(34).
Removesnapring(31).Ifnecessary,extractthebearing.
Cleanandcheckthecomponents.Replaceanypartsfoundtobedefective.
Iffitted,usinganappropriatefixture,insertbearing(34)thrustagainsttheshoulderonlayshaft
(30)andcheckthattheneedlebearingturnsnormally.Placesnapring(31).Lubricateanewseal
(40)andfititonpin(41).Enterthepinthroughthechamferedportoftheintermediatehousing
(19).
Tolimitaxialclearanceofthepin,itisrecommendedtocarryoutshimmingwithatoleranceof
0.1mmto0.6mm.
Shimming
Onthepin,placeanapproximatethicknessofshim(s)(45).Fitfinger(39)andpartiallyfitpin
(39).Reassemblethelink(42)andbolt(43).
Manuallyevaluatetheexistingclearance.
Theadjustmentprincipleconsistsinobtainingaminimumclearancebetweenthevariousparts.
Action
Iftheclearanceisoutsidethemaximumstatedtolerance,determineanewthicknessofshim(s).
Aftershimming,checkforthecorrectorientationofthefingerandthelink.Definitivelyinsertpin
(38),fitandtightenAllenscrew(43).Fittheshaft,couplerandforkintheintermediate
housing.Refittheguiderodandnutassembly.Refittheunit(24).Adjustthefork(seesubsequent
operations).
Couplethetractorbetweenthegearboxandtheintermediatehousing.
Connectthecontrolcableandadjustitifnecessary.
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Tractorpartsandattachments:AG150/AG250PowershiftgearboxCreeper
Adjustment
Fitthelockingstud(35),spring(36)andplug(38).Partiallytightentheplug.
Positioncoupler(29)inaccordancewithF1,itsforwardfacethrustagainstshaft(2).
MaintaintheforkthrustagainstthecouplerinaccordancewithF2.Turntheguiderod(28)innut
(25)accordingtoF3soastoplaceincontacttheobliquefaceofgrooveG1withlockingstud(35)
whilesimultaneouslyholdingnut(26)againstspotfacedfaceBoftheintermediatehousing(19).
Usingadepthgauge,measureX1betweentheforwardfaceoftheguiderodandfaceAofthe
intermediatehousing(19).
HoldtheforkthrustagainstthecouplerinaccordancewithF2.
TurntheguiderodinthenutinaccordancewithF4soastoplacetheotherobliquefaceofgroove
G1incontactwiththelockingstudwhileholdingnut(26)aspreviously.
MeasureX2inthesamemannerasX1.
DeterminethepositionofadjustmentXusingthefollowingformula:X=(X1+X2):2
Provisionallypositionguiderod(28)todimensionX.
Placecoupler(29)inthe"Creeperunit"position.Manuallycheckforlockingofthecontrolandthe
clearancebetweentheforkandthecoupler.
Ifthischeckissatisfactory,removeunit(24),plug(37),thespringandthelockingstud.
Greasethethreadsoftheguiderodandthethreadsofnut(26).
Tightenthenut,previouslylightlysmearedwithLoctitefreinfiletfaibe,anddefinitivelyposition
theguiderodaccordingtothepreviouslycalculateddimensionX.
Lockthenutbybendingitscollarintothemachinedgrooveoftheguiderod.
Reassemblethelockingmechanism.Tightenplug(37)toatorqueof5070Nm.Refitunit(24).
Disassemblingandreassemblingtheepicyclicalreducergear
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Tractorpartsandattachments:AG150/AG250PowershiftgearboxCreeper
Removeunit(24).Takeoutbolts(23).Removehousing(44).Disengagereducergear(20)from
shaft(2).Removecrownwheel(16).Separatesupports(5)(7).Ifnecessary,takeoffsnapring(6)
andcirclips(8)(9).Extractbearing(10).Removethefrictionwashers(12).Takeoffcirclip
(11).Driveoutpins(13).Removesungears(15)takingcarenottolosetheneedlebearings(18),
spacers(17)andthefrictionplates(14).
Thecouplerring(22)isfittedintheplanetarycarrierusingapress.Snapring(21)provides
additionallockingofthevariousparts.
Checkandcleanthecomponents.Replaceanypartsfoundtobedefective.
Fiteachsungear(15)withbothneedlebearings(18)andspacer(17)smearedwithmiscible
grease.Refitthesungearsandpositionthefrictionplates(14).Refitpins(13)correctlyturningthe
spotfaceforthefittingofsnapring(11).Fitthesnapring.Manuallychecktheaxialclearanceand
rotationofeachsungear.Lightlysmearthefacesofthereducergearwithmisciblegreaseandfit
thefrictionwashers(12),withthetabslodgedintheappropriategrooves.Ifdisassembled,insert
bearing(10)onshaft(2)usinganappropriatefixture.Fitcirclips(8)(9)andsnapring
(6).Assemblesupports(5)(7).Engagereducergear(20)onshaft(2).Refitthecrownwheel(16).
Positionhousing(44),withthecutoutturneddownward.Assembleandtightenbolts(23)previously
lightlysmearedwithLoctite241andtightentoatorqueof1014Nm.Refitunit(24).
Adjustingthecontrol
Onlever"A"
Placecontrollever"A"inthe"Snail"position.Screwyoke(1)flushwiththeendofthethreaded
partofthecable(6).Fittheyoke(1)ontolever"A"withclip(7).Tightennut(2).Tightennut(3)
againstsheathend(5).
FitthesheathendandGrowerwasherontothesupport.Tightennut(4)checkingthatthecableis
notpinched.
Onlink"B"
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Tractorpartsandattachments:AG150/AG250PowershiftgearboxCreeper
Placelink"B"inthe"Creeper"position(coupler(29)lockedbysplinestoplanetarycarrier(20)fork
locked).Screwyoke(9)flushwiththethreadedpartofcable(6).Assembleyoke(9)ontolink"B"
usingclip(10).Tightennut(11).
Adjuststop(12)usingnut(13)onsupport(8)whilecheckingthatlink"B"isstillcorrectly
locked.Tightennut(14)andcheckthatthecableisnotpinched.
CheckforcorrectoperationandlockingofthecontrolintheDirectdriveposition.
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