High Exhaust System Temperature
(HEST)
WARNING
If the High Exhaust System Tempera-
ture (HEST) warning light is on, do not
park near people. The heat generated
by the engine aftertreatment system
(EAS) may cause serious burns if EAS
components are contacted. Failure to
do so may result in property damage,
personal injury, or death.
WARNING
If the High Exhaust System Tempera-
ture (HEST) warning light is on, do not
park near combustible vapors or mate-
rials. You must keep combustibles at
least 5 ft. (1.5 m) away from the ex-
haust (outlet) stream as it exits the tail
pipe while the HEST light is illuminat-
ed. Failure to do so could ignite an ex-
plosion and cause serious injury to by-
standers.
WARNING
When the High Exhaust System Tem-
perature (HEST) warning light is on,
the temperature of the tailpipe, ex-
haust pipes, diesel particular filter
(DPF)/selective catalytic reduction
(SCR) device and surrounding compo-
nents (including enclosures and steps)
becomes elevated and can cause seri-
ous burns to the skin. Allow adequate
cooling time before approaching, or
working on or near, any part of the ex-
haust system or surrounding compo-
nents. Failure to do so may result in
property damage, personal injury, or
death.
The purpose of the High Exhaust System
Temperature (HEST) warning light is to
notify the operator to high temperatures in
the vicinity of the tail pipe, diesel
particulate filter (DPF), and surrounding
components during a regeneration. The
HEST warning light turns on only when the
vehicle is stationary or moving slowly: less
than 5 mph (8 kph).
During a regeneration, some EAS
components can reach temperatures
greater than 1202°F (650°C). Therefore, it
is important to
Pay attention to the HEST warnings
prior to, during, and immediately
following a regeneration.
Diesel Exhaust Fluid (DEF) Lamp
The engine aftertreatment system includes
a diesel exhaust fluid (DEF) warning lamp
on the DEF gauge and additional warning
lamps or popup messages in the
instrument cluster. Refer to the operator
manual for more details.
The engine aftertreatment system includes
diesel exhaust fluid (DEF) warning lamps
or popup messages in the instrument
cluster. Refer to the operator manual for
more details.
DEF Warning Lamp in Instrument Cluster
The system will alert the operator when the
fluid in the DEF tank reaches a low level.
Refer to the operator manual for more
ENGINE OPERATION - Operating Instructions
16
Y53-1185-1J1 (10/21)
1
Содержание PX-9
Страница 1: ...Operator s Manual Operator s Manual 2022 Model Year Warranty 2021 Emissions...
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Страница 3: ...PX Operator Manual PACCAR PX 9 Engine...
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Страница 5: ...Engine Operation 1 Engine Maintenance 2 Engine Warranty 3 Contents...
Страница 78: ...ENGINE MAINTENANCE Engine Identification Y53 1185 1J1 10 21 75 2...
Страница 79: ...Chapter 3 ENGINE WARRANTY United States and Canada Engine Warranty 77 ENGINE WARRANTY 76 Y53 1185 1J1 10 21 3...
Страница 92: ...ENGINE WARRANTY United States and Canada Engine Warranty Y53 1185 1J1 10 21 89 3...
Страница 96: ...Index...