Allison Transmission 4000 EVS

7.7BUMP-SHIFTLEVERSELECTOR
TheAllisonBump-ShiftLeverselectorisanelectromechanicalcontrolthathas
lockedpositionstopreventaccidentallyselectingR(Reverse),N(Neutral),
orD(Drive).
Bump-ShiftLeverselectorpositionsare:
•R(Reverse):selectsreversegear.Bumpingtheleverforwardwillselect
thealternatereversegearrangeinselectmodels.Formoreinformation
on2
nd
Reverseforthe40007-speedmodels,refertoTechnical
Document(TD)188,ApplicationandInstallationRequirementsfor2
nd
Reverse.
•N(Neutral):mustbeselectedpriortostartingtheengine.
•D(Drive):selectsthehighestavailableforwardrange.Transmission
shiftstostartinggearandwillautomaticallyupshiftthroughthegears,as
operatingconditionspermit,untilthehighestavailablegearisattained.
•L(Low):selectsthelowestavailableforwardrange.Thetransmission
willautomaticallydownshifttothelowestrangeusingthepreselect
downshiftschedule.Onceattained,thetransmissionwillholdthelow
rangeuntilanotherrangeisselected.
•M(Manual):movingthebump-shiftleverfromtheDrivepositioninto
theManualSelectpositionallowstheoperatortoselectaloweror
higherforwardgearrange.
–Initiallymovingthebump-shiftlevertoM(Manual)setstheRange
SelectedtothesameforwardrangeasthecurrentRangeAttained,
shownintheMONITORpositiononthedisplay.Referredtoas
ExpressPreselect.
–EachDOWNSHIFT(-)bumpdecreasestheRangeSelectedby
oneforwardrange.
–EachUPSHIFT(+)bumpincreasestheRangeSelectedbyone
forwardgearrange.
–Thesearemomentarybumppositions–whentheoperator
releasesthebump-shiftlever,thebump-shiftleverreturnstothe
Driveposition.
–TheM(Manual)positionisaccessibleonlyfromtheDriveposition
andaffectsonlyforwardgearranges.
Inadditiontothefeatureslistedin7.0SHIFTSELECTORSCOMPONENTS
ANDFUNCTIONS,thebump-shiftleverselectoralsoincludesthefollowing
features:
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