OPERATING CONTROLS AND PROCEDURES MLC165-1 OPERATOR MANUAL
3-34
Published 08-06-19, Control # 237-09_v1
High Exhaust System Temperature
(HEST)
When on, indicates that higher than normal
exhaust temperatures exist, normally due to
SCR regeneration. It is normal for this indicator to come on
during normal operations.
DEF Tank Level
When on, indicates that the level of diesel
exhaust fluid (DEF) in the tank is low.
The number below the icon is the percentage
of usable DEF remaining in the DEF tank.
• At a 10% level of DEF left in the tank, the alert will come
on.
• At a 5% level of DEF left in the tank, the alert will flash on
and off.
At engine startup, the DEF tank indicator will flash on and off
as the system does a functional test and fills the DEF lines.
Within 2 minutes, the indicator should go off unless the DEF
level is low.
At engine shutdown, the DEF dosing unit purges the DEF
lines and returns the unused DEF to the tank.
NOTE: DEF will freeze at 12° F (–11° C). When frozen, it
will expand by 7%. There are no approved
additives to improve the freezing point.
NOTE: Do not store DEF for long periods of time. DEF will
deteriorate relative to time and temperature. Low-
quality DEF may require the tank to be drained and
the system purged.
If the following fault codes are activated, the operator has a
limited time to operate the engine with full power:
NOTE: The following time limits are approximate.
• Low DEF Level (Amber): This warning comes on when
the level of DEF in the tank is 2.5%. Engine power and
speed will be reduced.
If the level falls to 0%, the operator has 30 minutes
before engine power will be reduced further.
• Low DEF Level (Red): This warning comes on when
the level of DEF in the tank has been 0% for 30 minutes.
The engine will continue to operate at reduced power
and speed for another 30 minutes, then the engine will
shut down.
• Low DEF Quality (Amber): This warning comes on
when the DEF in the tank is of poor quality. If not
corrected:
After 150 minutes, engine power and speed will be
reduced.
After another 75 minutes, engine power will be further
reduced. The engine will run in this condition for 15
minutes, then the red indicator will come on.
• Low DEF Quality (Red): This is the final warning. If the
problem is not corrected, the engine will operate at
reduced power and speed for 30 minutes, then the
engine will shut down.
• SCR Malfunction or Tampering (Amber): This warning
comes on when a problem with the SCR has been
detected. If not corrected:
After 150 minutes, engine power and speed will be
reduced.
After another 75 minutes, engine power will be further
reduced. The engine will run in this condition for 15
minutes, then the red indicator will come on.
• SCR Malfunction or Tampering (Red): This is the final
warning. If the problem is not corrected, the engine will
operate at reduced power and speed for 30 minutes,
then the engine will shut down.
NOTE: The above is only a partial list of faults that may be
set by the engine ECM.
EMERGENCY CAB EXIT
If a situation arises that prevents the sliding door from
opening, the front window may be kicked out. It is designed
to give way if firmly kicked from the inside of the cab.
CAB VENTILATION
The right window, rear window, and the overhead window
(non-CE crane) can be opened for ventilation.
WARNING
High Exhaust Temperatures
Active SCR regeneration can occur at low engine idle as
well as during crane operation. This may result in high
exhaust temperature.
Always keep personnel well away from the exhaust to
prevent injury.
WARNING
Chemical Hazard
DEF contains urea. Do not get DEF in your eyes. In case
of contact, immediately flush eyes with large amounts of
water for a minimum of 15 minutes. Do not swallow. In the
event DEF is ingested, contact a physician immediately.
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