EXHAUST AFTER-TREATMENT SYSTEM
PART 7: STARTING & OPERATING THE VEHICLE
– 128 –
Y53-6032
(05/10)
Notification of High Exhaust System Temperature:
Indicator
Information
What to do
On-Steady
The High Exhaust Temperature (HEST) warning
lamp will illuminate, regardless of ATS status, as
the vehicle's exhaust outlet temperature
becomes extremely hot (at least 450 deg C /
842 deg F) and subsequently the vehicle speed
slows to below 5 mph / 8 kph.
This will typically occur when:
An Automatic or Parked Regeneration is in pro-
cess
or
During normal vehicle operation when engine is
under high or heavy loading
Follow all warnings listed below. Use the STOP function of the
Regeneration Switch if the situation requires. Follow the instructions
described “Stop an Automatic or Parked Regeneration” on page 133
WARNING! Temperatures of the exhaust pipes and at
the outlets of the exhaust system during and shortly
after a regeneration event will be extremely hot. If the
High Exhaust System Temperature (HEST) warning
lamp is on:
• Do not park in an area of combustible vapors or mate-
rials. You must keep combustibles at least five (5) feet
away from the side and top of the vehicle while the
HEST light is illuminated. Always park your vehicle
outside. Failure to do so could ignite an explosion
which could result in serious injury or death.
• Do not park in an area where people are close by. You
must keep bystanders at least five (5) feet away from
the exhaust outlet while the HEST light is illuminated.
Failure to do so could result in serious injury or death.
• The exhaust piping, diesel particular filter (DPF) or tail
pipe become extremely hot during engine operation
or any regeneration event and can cause serious
burns to the skin. Allow adequate cooling time before
working on or near any part of the exhaust system.
Y53-6032.book Page 128 Monday, May 24, 2010 3:37 PM
Summary of Contents for Peterbilt 587
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