Allison Transmission 3000

Range),downshiftsfromtheAlternateEngineBrakePreselectRangeto2
(SecondRange)usesnormal(non-preselect)closedthrottleshiftspeeds.
NOTE:Ifanexhaustbrakeorenginecompressionbrakeisinstalled
ontheengine,thentheymustbeintegratedtothetransmission
controls.Shiftqualityissueswillariseifnotproperlyintegratedto
thetransmissioncontrols.
4.2.2.4RETARDERMODESHIFTSCHEDULE
Theretardermodeshiftscheduleisautomaticallyactivatedwhentheretarder
isswitchedoninordertoraiseclosedthrottledownshiftsforadditionalcooling
duringretarderoperation.Retarderclosedthrottledownshiftsoccuratspeeds
approximatelyhalfwaybetweenthenormalclosedthrottledownshiftandthe
preselectdownshiftforeachrange.Referto4.3USINGTHEHYDRAULIC
RETARDER.
4.2.3ACCELERATORCONTROL.Thepositionoftheacceleratorpedal
inuenceswhenautomaticshiftingoccurs.Anelectronicthrottleposition
signaltellstheTCMhowmuchtheoperatorhaspressedthepedal.Whenthe
pedalisfullypressed,upshiftsoccurautomaticallyathigherenginespeeds.
Apartiallypressedpositionofthepedalcausesupshiftstooccuratlower
enginespeeds.
4.2.3.1KICKDOWNSHIFTSCHEDULE(N/AforOFSModels)
Kickdownisanoptionalshiftschedulewhichisactivatedwhenthekickdown
inputfunctionisenabled.IfshiftscheduleS2,S3,orS4isinuseandkickdown
isactive,allshiftsreverttoscheduleS1,WideOpenThrottle(WOT)shift
points.Similarly,ifshiftscheduleS6,S7,orS8isinuseandkickdownis
active,allshiftsreverttoscheduleS5,WOTshiftpoints.
4.2.4PRIMARYANDSECONDARYSHIFTSCHEDULES(N/AforOFS
Models).Theprimaryshiftscheduleisnormallyusedeachtimethevehicle
isstartedandisspeciedinsuchawaytoaccommodatenormalvehicle
operation.
ThesecondaryshiftscheduleisanalternateshiftschedulethattheTCMonly
usesuponrequest.Therequestforthisschedulecanbeadedicatedrequest
fromtheoperatororitcanbeinterlockedwiththeoperationofanothervehicle
system.
PrimaryandsecondaryshiftschedulesmaybechangedusingtheMODE
button,butsomeapplicationsmayuseadash-mountedswitch.TheMODE
displayilluminateswhileinsecondaryshiftschedule.Thevehiclemight
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