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SECTION 2 - OPERATION
2-77
Low Engine Oil Pressure (140--210 kPa
(20--30 psi)) at Engine Speeds
Above 1200 rpm
The Module on the Cummins engine will react to
a condition of low engine oil pressure (140 -- 210
kPa (20--30 psi)) when the engine speed is
above 1200 rpm. The quantity of oil in the lube
circuit is not adequate to properly protect the
engine components at the selected engine
speed (normal oil pressure for engine speeds
above 1200 rpm is 210 -- 345 kPa (30--50 psi)).
See “Engine” in Section 4 of the Operator’s
manual for possible causes of low engine oil
pressure. Failure to correct the low oil pressure
condition can cause serious damage to the
engine. The following description details the
reaction of the EICS, Cummins Module and
audible alarm in the event of low engine oil
pressure when engine speed is above 1200
rpm:
With the engine running at a speed above 1200
rpm and the engine lubrication pressure
between 140 -- 210 kPa (20--30 psi), no warning
lights will be illuminated on the EICS of the
tractor.
The module, 1, will sense the low oil pressure
condition and begin an engine speed/engine
power derate. The module will lower the engine
rpm to a preset level (1400 rpm) allowing no
acceleration of the engine above that level AND
lower the horsepower output of the engine a
preset amount (20% of gross horsepower) as
long as the low engine oil pressure condition
exists.
Both the speed and engine power derate will be
gradual and simultaneous. Elapsed time of the
speed and power derate from maximum
horsepower and 2100 engine rpm to the 1400
rpm and 20% reduced horsepower output level
will be approximately 25 seconds
(approximately 40 rpm/second, and 1%
horsepower/second). This reduced speed and
power output mode will allow the Operator to
move the tractor from an undesirable location
and correct the concern.
ATTENTION: The engine will continue to run
while not receiving adequate amounts of
lubrication. Serious engine damage can result
from running the engine in this condition. It is
imperative that the low engine oil pressure
condition be investigatedas soon as possible so
as to avoid serious engine damage.
1
Figure 2-109