Allison Transmission T 280 User Manual

•HOLDOVERRIDEBUTTON:TheHOLDOVERRIDEbuttonisa
nger-controlledbuttonintegratedintothetopandfrontsideofthe
bump-shiftleverselectorknob.Thisbuttonusesadetentfeaturewith
lockedpositionstopreventaccidentalrangeselection.PresstheHOLD
OVERRIDEbuttontoreleasethedetentandmovethebump-shiftlever
fromanyoftheselockedpositions.
•DISPLAYMODE/DIAGNOSTIC(DMD):TheDMDbutton,when
pressed,allowsaccesstouidlevelinformation,prognostics
information,andDTCinformation,dependingonhowmanytimesit
waspressed.
7.8KEYPADPUSHBUTTONSHIFTSELECTOR
TheAllisonkeypadpushbuttonshiftselectorhassixbuttonsonthekeypad
thatcausethefollowingtransmissionoperationstooccur:
•R:Presstoselectreverse
•N:Presstoselectneutral
•D:Presstoselectdrive
•UpshiftandDownshiftArrowButtons
ThesebuttonsareusedtochangetheRangeSelectedtoahigheror
lowerforwardrange:
–OnepressoftheDOWNSHIFTbuttonsetsrangeSELECTtothe
samerangeasthecurrentrangeattained,shownintheMONITOR
positiononthedisplay.ReferredtoasExpressPreselect.
–EachsubsequentpressoftheDOWNSHIFTbuttondecreasesthe
rangeselectedbyonerange.
–OnepressoftheUPSHIFTbuttonincreasestherangeselected
byonerange.
–IftheUPSHIFTorDOWNSHIFTbuttonisheldcontinuously,the
selectedrangewillcontinuetochangeupordownuntilthebutton
isreleasedoruntilthehighestorlowestpossiblerangeofgears
isselected.
•MODE:Multi-functionaluse(referto7.3MODEBUTTON).
Exceptforsome4700modelswitha2
nd
Reversefeature,the↑(Upshift)and
↓(Downshift)arrowsareonlyfunctionalwhileinaforwardrange,andnotin
N(Neutral)orR(Reverse).
Pressingboththe↑(Upshift)and↓(Downshift)arrowssimultaneously
whenthetransmissionisinNeutralinvokesrequestsforreadingoil
level,prognosticsinformationorDTCs(referto7.0SHIFTSELECTORS
135

Allison Transmission T 280 Specifications

General

Brand	Allison Transmission
Model	T 280
Category	Controller
Language	English