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M0076814-03
DEF header (1) contains level sensor temperature
sensor and quality sensor.
Battery Disconnect Switch
(If Equipped)
Illustration 35
NOTICE
Do not turn off the battery disconnect switch until the
indicator lamp has turned off. If the switch is turned
off when the indicator lamp is illuminated the Diesel
Exhaust Fluid (DEF) system will not purge the DEF. If
the DEF does not purge, DEF could freeze and dam-
age the pump and lines.
NOTICE
Never move the battery disconnect switch to the OFF
position while the engine is operating. Serious dam-
age to the electrical system could result.
Battery Disconnect Switch – The battery
disconnect switch can be used in order
to disconnect the battery from the
engines electrical system. The key must be
inserted into the battery disconnect switch
before the battery disconnect switch can be
turned.
ON – To activate the electrical system,
insert the disconnect switch key and
turn the battery disconnect switch
clockwise. The battery disconnect switch must
be turned to the ON position before you start the
engine.
OFF – To deactivate the electrical
system, turn the battery disconnect
switch counterclockwise to the OFF
position.
The battery disconnect switch and the engine start
switch perform different functions. The entire
electrical system is disabled when you turn the
battery disconnect switch to the OFF position. The
i05422613
battery remains connected to the electrical system
when you turn the engine start switch to the OFF
position.
Turn the battery disconnect switch to the OFF
position and remove the key when you service the
electrical system or any other engine components.
Turn the battery disconnect switch to the OFF
position and remove the disconnect switch key after
you operate the engine. This will prevent the battery
from being discharged. The following problems can
cause battery discharge:
• short circuits
• current draw via some components
• vandalism
Selective Catalytic Reduction
g03422039
Warning System
The selective catalytic reduction (SCR system is a
system used to reduce NOx emissions from the
engine. Diesel exhaust fluid (DEF is pumped from
the DEF tank and is sprayed into the exhaust stream.
The DEF reacts with the SCR catalyst to reduce NOx
and leaves a nitrogen and water vapor. The Exhaust
Gas Recirculation (EGR system cools, measures,
and introduces recalculated exhaust gas into the
intake manifold to aid in NOx reduction.
The engine and emissions control system shall be
operated, used, and maintained in accordance with
the instructions provided to the end user to maintain
the emissions performance of the engine within the
requirements applicable to the category of the
engine. No deliberate tampering with, or misuse of
the engine emissions control system should take
place. In particular regarding deactivating, or not
maintaining the SCR system.
Stopping the engine immediately after the engine has
been working under load can result in overheating of
SCR components.
Refer to the Operation and Maintenance Manual,
"Engine Stopping" procedure to allow the engine to
cool and to prevent excessive temperatures in the
turbocharger housing and the DEF injector.
Operation Section
Battery Disconnect Switch
i07507902
NOTICE
37
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