EXHAUST AFTER-TREATMENT SYSTEM
PART 7: STARTING & OPERATING THE VEHICLE
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Y53-6032
(05/10)
Driving Bobtail or with an Unloaded Trailer
We recommend that you do not use your engine retarder
to slow down when you are bobtailing or pulling an empty
trailer.
WARNING! Using an engine retarder can
cause a wheel lockup. The trailer is not load-
ing the tires enough to give the traction you
may need. When you are bobtail or unloaded,
you can have a serious accident if your
wheels lock suddenly during braking. You
could be killed or injured. Don’t use your
retarder when you are driving bobtail or with
an unloaded trailer.
Exhaust After-Treatment System
NOTE: The emission warning lamps and emission
switch functions described below supersede those
listed in the Engine manufacturer's Operator and
Maintenance manual. For additional Emissions
Aftertreatment information specific to your engine,
see the Engine manufacturer's Operation and
Maintenance Manual supplied in your vehicle. All
other lamp and switch functionality described in
the manual are still valid.
In order to meet EPA engine emission requirements, vehi-
cles will have an exhaust After-Treatment System (ATS)
which includes a Diesel Particulate Filter (DPF), Regener-
ation Switch and warning lights. The DPF will trap soot
from the engine exhaust gases. The ATS will periodically
regenerate the DPF.
The Regeneration Switch is mounted on the dash and can
override the ATS. Various situations may require the
operator to use the functions of this switch. Refer to
“Regeneration Switch” on page 51 to view the regenera-
tion switch and its use. In addition, refer to “Parked
Regeneration” on page 131 and “Stop an Automatic or
Parked Regeneration” on page 133 for more operating
information.
ATS specific warning lights and indicator symbols will
reside in the driver information display unit.
Functionality / Notification
Information
The ATS will regenerate the DPF by using hot exhaust
gases normally generated by the engine. This typically
occurs during highway operation. This is referred to as a
Y53-6032.book Page 126 Monday, May 24, 2010 3:37 PM
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