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SECTION 2 - OPERATION
2-81
High Engine Coolant Temperature
The Electronic Instrument Control System will
notify the operator that the engine coolant
temperature has reached a point that will no
longer provide adequate cooling, and engine
overheating may occur. Simultaneously, the
module of the Cummins engine will begin an
engine derate sequence that will help protect
the engine from harmdue to high engine coolant
temperature. See “Engine” in Section 4 of the
Operator’s manual for possible causes of high
engine coolant temperature. Failure to correct
the high engine coolant temperature can cause
serious damage to the engine components. The
following description details the reaction of the
EICS and Cummins module in the event of high
engine coolant temperature:
With the engine running, and the coolant
temperature at 103_C (218_ F), the module will
sense the high engine coolant temperature and
begin an engine power derate. Engine speed
will not be affected by the derate in power, and
the Operator will havefull range of engine speed
available using the hand throttle. The engine
power derate will be gradual as long as the high
coolant temperature condition exists and the
engine is running. The derate will occur in
stages based on the temperature of the engine
coolant. For every degree of coolant
temperature above 103_C (218_ F), the power
level of the engine will be reduced 2% of gross
engine horsepower, to a maximum of 20%
power derate at 103_C (218_ F). An example of
this would be an engine that is operating at
106_C (222_ F). The coolant temperature is
3
_
C(4 _ F) over 103_C (218_ F), therefore the
derate in power is 8%.
At this point, two choices for continuing
operation of the tractor are available. First, the
Operator can reduce the load on the engine by
shifting down and/or raising the implement out
of the ground. Secondly, the Operator can stop
the tractor forward motion and allow the engine
torunwithnoloadonit.
Electronic Engine
Figure 2-111