Everygearhasacharacteristicpattern.Theillustrationsshowtypical
patternsonlyandexplainhowpatternsshiftasthegearlocationischanged.
Whenmakingpinionpositionchanges,shimsshouldbechangedinthe
rangeof0.05to0.10mm(0.002to0.004inch)untilacorrectpatternhas
beenobtained.
Whenachangeinbacklashisrequired,backlashshimsshouldbechanged
intherangeof1-1/2timestheamountofbacklashnecessarytobringthe
gearsintospeciîš¿cation.Forexample,ifthebacklashnecessarytobe
changedby0.10mm(0.004inch),theshimpackshouldbechangedby0.15
mm(0.006inch)asastartingpoint.
Highbacklashiscorrectedbymovingtheringgearclosertothepinion.Low
backlashiscorrectedbymovingtheringgearawayfromthepinion.These
correctionsaremadebyswitchingshimsfromonesideofthedifferential
casetotheother.
g226455
Figure250
1.Heel3.T oe
2.Driveside
4.Coastside
Example1:Backlashcorrect.Thickerpinionpositionshimsnecessary
(Figure250).
g226456
Figure251
1.Heel3.T oe
2.Driveside
4.Coastside
Example2:Backlashcorrect.Thinnerpinionpositionshimsnecessary
(Figure251).
Groundsmaster
®
3280-D/3320
Page8–41
DriveAxles:ServiceandRepairs
05138SLRevB
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