Paccar PX-7, Operator'S Manual

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(HEST), Diesel Particulate Filter (DPF) and
Diesel Exhaust Fluid (DEF) warning lamps.
NOTE
The malfunction indicator lamp (MIL)
will illuminate if the on-board diagnos-
tics (OBD) system detects a possible
emissions system failure. The vehicle
should be brought in for service at the
next opportunity to ensure the condi-
tion is corrected.
Diesel Particulate Filter (DPF)
Warning Lamp
This warning symbol will appear when the
DPF needs to be regenerated and then
also during the regeneration cycle. This
icon may also appear if the system is
attempting to automatically regenerate
while the vehicle is in Power Take Off
operation mode.
Engine aftertreatment system includes a
diesel particulate filter and DPF warning
lamp.
High Exhaust System Temperature
(HEST) Warning Lamp
Keep vehicle a safe distance from
combustible items.
WARNING
Temperature of the tail pipe, exhaust
pipe, the diesel particular filter (DPF)/
selective catalytic reduction (SCR) de-
vice and surrounding components in-
cluding enclosures and steps, will be
elevated during and shortly after a re-
generation event or normal vehicle op-
eration when engine is under high or
heavy loading.
If the High Exhaust System Temperature
(HEST) warning lamp is on:
• Do not park in an area of
combustible vapors or materials.
You must keep combustibles at
least 5 ft. (1.5 m) away from the
exhaust (outlet) stream (as it exits
the tail pipe) while the HEST lamp
is illuminated. Always park your
vehicle outside. Failure to do so
could ignite an explosion or harm
bystanders which could result in
serious injury.
• Do not park in an area where
people are close by. You must keep
combustibles at least 5 ft. (1.5 m)
away from the exhaust outlet while
the HEST lamp is illuminated.
Failure to do so could result in
serious injury.
• Do not approach the exhaust
system or surrounding areas
without allowing adequate time for
the system to cool down. Failure to
do so could result in serious burns
to the skin.
Diesel Exhaust Fluid (DEF) Lamp
The engine aftertreatment system includes
a diesel exhaust fluid (DEF) warning lamp
ENGINE OPERATION - Operating Instructions
Y53-1183-1G1 (05/19) 15
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