Toro Groundsmaster 4500-D Series - Page 402

PinionGeartoRingGearEngagement(continued)
g276539
Figure273
1.Inputshaft/piniongear3.Differentialgearcase
2.Bearingcaseshims
4.Differentialbearingshims
3.Whileapplyingalightloadtotheringgear,rotatethepiniongearinthe
directionofforwardtraveluntiltheringgearhasmadeonecomplete
revolution.
Idealtoothcontactobservedontheringgearshouldcovermorethan35%of
eachtoothsurface.Thecontactareashouldbeinthecenterofeachtooth
andextend1/3to1/2wayacrosseachtoothfromthetoeend(Figure272).
Adjustmentstothegearcontactpositionaremadebymovingtheinput
shaft/piniongear(bearingcaseshims)orbymovingthedifferentialgearcase
(differentialbearingshims)(Figure273).
Note:Bearingcaseshimsareavailablein0.10mm(0.004in)and0.20
mm(0.008inch)thickness.
Note:Differentialbearingshimsareavailablein0.10mm(0.004in),0.20
mm(0.008in)and0.40mm(0.016in)thickness.
Studythedifferentcontactpatterns(Figure274andFigure275)andcorrect
gearengagementasnecessary.
Note:Whenmakingchanges,notethattwovariablesareinvolved(seeGear
PatternMovementSummary(page7–45)).
Example:Ifthepiniongeartoringgearbacklashissetcorrectlyto
specicationsandthebearingcaseshimischangedtoadjusttoothcontact,
itmaybenecessarytoreadjustbacklashtothecorrectspecicationbefore
checkingthecontactpattern.
Axles,PlanetariesandBrakes:ServiceandRepairs
Page7–44
Groundsmaster
®
4500-D/4700-D
19245SLRevA