Navistar ProStar+, Руководство по эксплуатации и обслуживанию, Страница: 179 / 304

Operation
• The SUSP / DUMP switch indicator will blink slowly in
the event of an ESC command fault, regardless of the
position of the SUSP / DUMP switch.
Exhaust Aftertreatment
Selective Catalytic Reduction System (If Equipped)
Introduction
Selective Catalytic Reduction (SCR) is the aftertreatment
technology that treats exhaust gas downstream of the engine.
It uses a urea-based Diesel Exhaust Fluid (DEF) and a catalyst
to significantly reduce nitrogen oxide (NOx) emissions.
Diesel Exhaust Fluid
Diesel Exhaust Fluid (DEF) is nontoxic, nonflammable, and
biodegradable. It is a carefully blended aqueous urea solution
of 32.5% high-purity urea and 67.5% deionized water.
If stored between 10° and 90°F (-12° and 32°C), DEF has shelf
life of 12 months minimum. For best shelf life, DEF containers
should be stored in a controlled environment out of direct
sunlight.
The amount of DEF consumption depends on engine speed,
load, and altitude; therefore, it differs from vehicle to vehicle.
CAUTION
To prevent property damage, Navistar, Inc.
requires the use of Diesel Exhaust Fluid (DEF)
that meets or exceeds ISO-22241-1. There is no
acceptable substitute.
Navistar recommends using Fleetrite ® brand Diesel Exhaust
Fluid.
DEF Tank
The DEF tank is located on the driver side of the vehicle, forward
of the fuel tank and behind the battery box. For reference, see
section
Model Description > Exterior Components .
The filler neck inlet on a DEF tank has a blue cap and has a
smaller diameter (19 mm) than that of a filler neck on the diesel
fuel tank.
The SCR system is designed to operate normally also under
freezing conditions while containing DEF. Though DEF freezes
at approximately 10°F (-12°C), no operator interaction is
necessary when operating in cold temperatures.
Under cold or very dry conditions, water vapor can be seen
coming from the vehicle tailpipe.
This is normal system
operation. The water vapor will disappear within a few minutes
of normal vehicle operation.
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