304OPERATION
DownhillOperation
CAUTION
DONOTexceedenginemanufacturer’s
recommendedmaximumenginespeed.
Enginedamagecanoccur.Ifequipped
withanengineorexhaustbrake,DO
NOTexceed2300rpm.
Onadowngrade,donotcoastwiththeclutchpedaldepressedorthetransmission
inneutral.Selectagearthatdoesnotallowtheenginespeedtoexceedtheengine
manufacturer’smaximumenginespeedrecommendation.Usetheengineorexhaust
brakeand/ortheservicebrakestocontrolthevehiclespeed.Asimpleruleistoselect
thesamegearusedtogoupthegrade.
HighAltitudeOperation
Engineslosepowerwhenoperatedathighaltitudebecausetheairistoothintoallow
burningasmuchfuelasatsealevel.Closelymonitorthegaugesduringhighaltitude
operation.Thethinnerambientairreducestheefciencyoftheenginecoolingsystem.
Engineoverheatorcylinderdamagecouldoccuriftheengineisoperatedatfullload
forextendedperiodsathighaltitudesinhotweather.Downshiftandreducevehicle
speedtoreduceengineloadwhendrivingonlonggradesintheseconditions.This
willhelpkeepengineairintakemanifoldandcoolanttemperatureswithinsafelimits.
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