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SECTION 3 – INSTRUMENTS, INDICATORS, AND SWITCHES
High Exhaust System Temperature (HEST) Lamp
Figure 17 HEST Lamp
WARNING: Exhaust components are operating under
normal conditions and exhaust gases are at extremely high
temperatures. When stationary, keep away from people
and flammable materials, vapors, or structures, or stop the
engine.
The HEST lamp will illuminate when the exhaust system is hot
and regeneration is in progress. For additional information see
the applicable Vehicle Operator Manual.
Page 42
Diesel Particulate Filter (DPF) Indicator
Figure 18 Diesel Particulate Filter Indicator
The diesel particulate filter indicator operates at three different
levels.
Level One
•
DPF indicator will illuminate solid and remain on when the
levels of soot exceed acceptable levels. The regeneration
process should begin by using either of the following two
methods.
The lamp will turn off when the regeneration
process is complete.
•
The vehicle can be safely driven on the highway at
highway speeds while the regeneration process is in
operation.
•
The vehicle should be parked in a safe location and
start the Parked Regeneration process to prevent loss
of power.
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