Case 570T - Page 200

8-TROUBLESHOOTING
Problem
PossibleCauseCorrection
VibrationsduringtravelIncorrectinstallation
Correcttheinstallation
Defectiveaxle
Inspectandrepair
Wrongweightdistribution
Distributetheweightdifferently
Bentorbrokenaxleshaft
Replacetheaxlebeam
Breaktowardstheouter
endoftheringgeartooth
Excessivegearloadcomparedtothepre-
scribedone
Replacethebevelgear
Incorrectgearadjustment(excessiveback-
lash).Loosepinionnut
Carefullyfollowtherecommendedadjust-
mentoperationsforringgearandpinion
backlashandfortoothmarkdetection
Breaktowardstheinner
endoftheringgeartooth
LoadcrashReplacethebevelgear
Incorrectgearadjustment(insufcient
backlash).Loosepinionnut
Carefullyfollowtherecommendedadjust-
mentoperationsforringgearandpinion
backlashandfortoothmarkdetection
Worn-outorscoredPinion
teethandringgearteeth
Insufcientlubrication
Replacethebevelgear
Contaminatedlubricant.Incorrectlubricant
orpooradditives
Replacethepinionbearings,payingatten-
tiontocorrectlypositiontheringgear,the
pinionandthebearingpreloading
Worn-outpinionbearingsthatcausean
incorrectpinionaxialbacklashandwrong
contactbetweenpinionandringgear
Useproperlubricant,lluptothecorrect
levelandchangeatrecommendedinter-
vals
Overheatedringgear
teethorpinionteeth.
Checkifgearteethhave
faded
ProlongedoperationathightemperatureReplacethebevelgear
Unsuitablelubricant.Lowoillevel.Con-
taminatedlubricant
Useproperlubricant,lluptothecorrect
levelandchangeatrecommendedinter-
vals
PitteddrivepinionteethExtremelyintenseuseReplacethebevelgear
InsufcientlubricationUseproperlubricant,lluptothecorrect
levelandchangeatrecommendedinter-
vals
Bentaxlebeambody
Overloadedvehicle.Vehicle’saccident.
Loadcrash
Replacetheaxlebeambody
Worn-outorpitted
bearings
Insufcientlubrication
Replacebearings
Contaminatedlubricant.Extremelyintense
use.Normalwear.Loosepinionnut
Useproperlubricant,lluptothecorrect
levelandchangeatrecommendedinter-
vals
Gasketsleakoil
Prolongedoperationatexcessiveoiltem-
perature
Replacethegasketandmatchingsurface
ifdamaged
Oilgasketwronglyinstalled.Gasketedge
cutorscored.Contaminatedlubricant
Useproperlubricant,lluptothecorrect
levelandchangeatrecommendedinter-
vals
Excessivewearofinput
angespline
Intenseuse
Replacetheange
Loosepinionnut
Checkthatthepinionsplineisnotexces-
sivelywornout
AxialbacklashofpinionReplacethebevelgear,ifnecessary
Fatiguebreakofpinion
geartooth.Checkifthe
fracturelineiswavyor
clearlydelineated(stop
line)
Intenseuse.Continuousoverload
Replacethebevelgear
Breakofpinionteethand
ringgearteeth
CrashloadofdifferentialcomponentsCheckand/orreplaceotherdifferential
components
Splinesofplanetary
gearworn-out(excessive
backlash)
Intenseuse
Replacedifferentialgearassy.Replacethe
axlebeam,ifnecessary
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