Allison Transmission T 375

4.1.2USINGBUMP-SHIFTLEVERSELECTORTOSELECTRANGE.
RefertoFigure4–1.
•R–REVERSE:selectsR(Reverse)gear.BumpingthelevertowardR
willselectthealternatereversegearrangeinselect4700/4800model
calibrations.
•N–NEUTRAL:mustbeselectedpriortostartingtheengine.
•D–DRIVE:selectsthehighestavailableforwardrange.Transmission
shiftstostartinggearandwillautomaticallyupshiftthroughthegears,as
operatingconditionspermit,untilthehighestavailablegearisattained.
•D–DRIVE(Primary(ROAD)ModeOFSModel):selectsthehighest
availableforwardrange.Transmissionshiftstostartinggearandwill
automaticallyupshiftthroughthegears,asoperatingconditionspermit,
untilthehighestavailablegearisattained.
•D–DRIVE(Secondary(RIG)ModeOFSModel):goestotherange
setinthecalibrationsetforstationarymode.
•L–LOWRANGE:selectsthelowestavailableforwardrange.The
transmissionwillautomaticallydownshifttothelowestrangeusingthe
preselectdownshiftschedule.Onceattained,thetransmissionwillhold
thelowrangeuntilanotherrangeisselected.
•M–MANUALSELECT:movingtheleverfromtheDrivepositioninto
theManualSelectpositionallowstheoperatortoselectaloweror
higherforwardgearrange.
•InitiallymovingthelevertoMsetstheRangeSelectedtothesame
forwardrangeasthecurrentRangeAttained,shownintheMONITOR
positiononthedisplay,alsoreferredtoasanExpressPreselect.
•EachDOWNSHIFT(-)bumpdecreasestheRangeSelectedbyone
forwardrange.
•EachUPSHIFT(+)bumpincreasestheRangeSelectedbyoneforward
gearrange.
•Thesearemomentarybumppositions–whentheoperatorreleasesthe
lever,theleverreturnstotheDriveposition.
•TheManualSelectpositionisaccessibleonlyfromtheDriveposition
andaffectsonlyforwardgearranges.
Detent:Theleverselectorfeaturesadetenttopreventinadvertentshifting
betweenR(Reverse),N(Neutral),D(Drive),andL(Low).T oreleasethelever
fromanyofthesepositions,thedetentmustrstbeunlockedbydepressing
thengerreleasebuttonontheshifterhandle.
Thebump-shiftleverselectorisavailableinthefollowingcongurations:
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