Paccar PX-9 - Page 30

OPERATINGINSTRUCTIONS
NOTE
Theengine(VGT)exhaustbrake
isdesignedtoassistthevehicle's
servicebrakeswhenslowingthe
vehicletoastop.
Vehicleservicebrakesmustalwaysbe
used.Theenginebrakeisnotintended
tobeusedastheprimarybrakeofthe
vehicle,norisitanemergencybrake.
Theengineretarderonlyhelpsthe
servicebrakesbyusingpressureto
slowthedrivetrain.Usetheservice
brakesforquickstops.
CAUTION
Exceedinggovernedenginespeed
cancauseenginedamage.Oper-
atingtheenginebeyondthemaxi-
mumenginespeedmaycausese-
riousenginedamageandiscon-
sideredengineabuse.Usetheen-
gineandvehiclebrakingsystems
tocontrolenginespeed.
Theoptimumbrakingpowerofthe
engine(VGT)exhaustbrakeisreached
atratedenginespeed.Correctgear
selection,therefore,iscritical.
Typically,onvehiclesequippedwith
automatictransmissions,theengine
electroniccontrolmodule(ECM)and
thetransmissionwilldeterminethe
correctgearselection.
3-
10Y53-1185-1B1(12/2014)
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