OPERATION303
IdleShutdownTimer
Theidleshutdowntimercanbeprogrammedtoshuttheenginedownafteraspecic
engineidlingtime.Thisprogrammingcannotbechangedbytheoperator,butcanbe
doneusingspecialtools.ContactyourauthorizedVolvoTruckdealerfordetails.
Thepermittedidletimecanbesettothefollowingtimeintervals:
Volvo–1to40minutes
Cummins–1to100minutes
Whentheidleshutdownfeatureisenabled,theenginewilltypicallyshutdownatthe
settimeunderthefollowingconditions:
Vehiclespeedis0.
Engineisrunningatidlespeed.
Coolanttemperatureisabove45°C(113°F).
Parkingbrakeisapplied(V olvoenginesonly).
Thesearestandardchoiceswhenthevehicleisdelivered.Formoreinformationabout
othercustomeradaptationchoices,contactyourauthorizedVolvoTruckdealer.
UphillOperation
Forbestperformance,allowenginespeedtoreachthebottomoftheratedtorquerange
beforedownshifting.Continuetodownshiftinthismanneruntilagearisreachedthat
willmaintainthedesiredspeed.Continuetooperateattheratedtorqueifthevehicle
willmakeittothetopwithoutadownshift.Beginupshiftingasthegradeofthehill
decreasesandtheenginebeginstoaccelerateabove1600rpm.Drivingthiswaywill
givethebestfueleconomyandperformance.
Note:Allowingtheenginetolugdowntotheendofmaximumtorquerangeis
permissibleifthevehicleiscrestingthetopofahill.However,extendedoperationat
enginespeedsbelowthemaximumtorquerange(usually1000to1200rpm)willraise
exhausttemperatureandcylinderpressure.Thiscanleadtoreducedenginelife.
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