Allison Transmission B3400 xFE

Table4–1.DESCRIPTIONOFAVAILABLERANGES(cont'd)
DescriptionofAvailableRanges(refertoFigure4–1)
WARNING:T oavoidlossofcontrol,useacombinationof
downshifting,braking,andotherretardingdevices.Downshifting
toalowertransmissionrangeincreasesenginebrakingand
canhelpyoumaintaincontrol.Thetransmissionhasafeature
topreventautomaticupshiftingabovethelowerrangeselected.
However,duringdownhilloperation,ifenginegovernedspeed
isexceededinthelowerrange,thetransmissionwillupshift
tothenexthigherrangetopreventenginedamage.Thiswill
reduceenginebrakingandcouldcausealossofcontrol.
Applythevehiclebrakesorotherretardingdevicetoprevent
exceedingenginegovernedspeedinthelowerrangeselected.
7
**
6
***
5
***
4
***
3
2
Selectinglowerrangesprovidegreaterenginebrakingforgoing
downgrades(thelowestrangedeliversthegreatestbraking
effect).Occasionally,itmaybedesirabletorestrictautomatic
shiftingtoalowerrangebecauseof:
•Roadconditions
•Load
•Trafcconditions,etc.
1First-rangeprovidesthevehiclewithitsmaximumdrivingtorque
andenginebrakingeffect.Userst-rangewhen:
•Pullingthroughmudanddeepsnow.
•Maneuveringintightspaces.
•Drivingupordownsteepgrades.
Stationary(RIG)
ModeOFS
ModelsShift
Schedules=
PowershiftShift
Schedules
444
*
,555
*
,666
*
,777
*
andvariousAutomaticShiftSchedules.
**
Onlyavailablein3700/4700/4800models
***
Actualrangesavailabledependonprogrammingbyvehiclemanufacturer.
*
IndicatesMaxAttainableRange
56