Allison Transmission B3400 xFE User Manual

3.11OPERATINGDOWNSTEEPGRADES(REAR-
DISCHARGEMIXER)
CAUTION:Withthistransmission,theservicebrakesmustbeused
whenbackingaloadedrear-dischargemixerdownagrade.Buttoo
muchbrakeapplication,particularlyonanunpavedsurface,can
lockthefrontbrakesandreducesteeringcontrol.Acrashcouldthen
occur.T ohelppreventinjuryorpropertydamage:
1.Driveforwarddownthegradeandthenexitbybackingupthe
gradewhenyoucandoso.
2.Ifequipped,usethetrailerbrakewhenbackingthemixerdown
agrade.Donotusethetrailerbrakeasaparkingbrakeonce
thevehicleisatthebottomofthegrade.
3.Ifatrailerbrakeisnotavailable,backthemixerdownthe
gradebymodulatingtheservicebrakestocontrolandmaintain
asafe,steadyvehiclespeed.Avoidabruptstopsandstarts.
3.12USING2
ND
REVERSE(4700/4800ONLY)
Selectedcalibrationsforthe4700/4800modelsofferanoptionfortworeverse
gears–astandardreversegearratioof4.80(shownasR2intheselector
display)andtheoptionaldeeperreverseratioof17.12(shownasR1inthe
selectordisplay).
TheAllison2
nd
Reversefeatureofferstheseoperationalbenets:
•Greatercontrolandenginebrakingduringoperationonsteepgrades.
•Moremaneuverabilitywhenoperatinginconnedspaces.
•Slowcreepcapabilitywithhighenginespeeds.
Referto4.1SELECTINGRANGEand7.0SHIFTSELECTORS
COMPONENTSANDFUNCTIONSforadditionalinformation.
43

Allison Transmission B3400 xFE Specifications

General

Brand	Allison Transmission
Model	B3400 xFE
Category	Controller
Language	English