Case 721G Stage IV, Operator'S Manual

Page: 262 / 522

7 - MAINTENANCE
Selective Catalytic Reduction (SCR) - Overview
Diesel Exhaust Fluid (DEF)/AdBlue® instrumentation warning
ATTENTION: the fuel system, exhaust after-treatment system, and engine on your machine are designed and built
to government emissions standards. Tampering by dealers, customers, operators, and users is strictly prohibited by
law. Failure to comply could result in government fines, rework charges, invalid warranty, legal action, and possible
confiscation of the machine until rework to original condition is completed. Engine service and/or repairs must be
done by a certified technician only!
Your machine is equipped with a warning system to inform the operator of the DEF/A
D
B
LUE
® level, system malfunc-
tions, and engine power loss that may result from the SCR system for reducing exhaust emissions.
During normal operation of your machine, the instrument
cluster displays the
DEF/A
D
B
LUE
® fluid level at all times.
Warning lights and indicators will illuminate with a warning
on the visual display. The display changes automatically
to allow the operator to view the warning indicator and
display message.
The DEF/A
D
B
LUE
® level bar gauge
indicates the level of diesel exhaust fluid
in the
DEF/A
D
B
LUE
® tank. When all bars
are illuminated, the tank is full. Illuminated
bars indicate the level of fluid remaining in
the
DEF/A
D
B
LUE
® tank. When the tank
is at 5–10% of tank volume, the warning
system will flash and/or will flash and
sound an audible alarm dependent upon
DEF/A
D
B
LUE
® levels.
LEIL15WHL0575AA
1
DEF/A
D
B
LUE
® level gauge
Gauge indication Condition Master indicator Alarm status
6–10% No engine power loss Caution (yellow) None
5% and below Moderate engine power
loss Caution (yellow) Continuous
Empty Severe engine power loss Stop (red) Continuous
Stop master indicator (red, critical)
The Stop Master Indicator is a critical warning display. See the “Critical Warnings” table.
When the Stop Master indicator illuminates, IMMEDIATELY bring the machine safely to a
stop, and turn the engine OFF.
Display Description
Corrective Action
Poor DEF/
A
D
B
LUE
®
Quality
Detected,
Power Limited
Moderate engine
power loss has begun,
up to
65% torque
reduction and 40%
engine speed within
40 min of engine
running time.
DEF/A
D
B
LUE
® quality/concentration is questionable. Drain the tank and
discard the DEF/A
D
B
LUE
® . Fill with new DEF/A
D
B
LUE
® .
NOTE: see “ DEF/A
D
B
LUE
® tank refilling” section for important tank draining
information.
DEF/A
D
B
LUE
®
Injection Failed
Power Limited
SCR fault/failure
detected. Up to
65%
torque reduction and
40% engine speed
reduction within
40 min .
Contact your local authorized dealer for repair.
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