(71°C), inspect the cooling system to determine the
cause. See
Fig. 3.37.
For Detroit engines, if coolant temperature rises
above the maximum temperature listed in
Table 3.2,
the CHECK engine lamp will illuminate. If the condi-
tion does not improve, the STOP engine lamp will
also illuminate and an audible warning will sound.
The engine will then derate or shut down, depending
on the type of engine protection system installed.
Maximum Coolant Temperature
Engine Make Temperature: °F (°C)
Cummins 225 (107)
Maximum Coolant Temperature
Engine Make Temperature: °F (°C)
Detroit 215 (101)
Table 3.2, Maximum Coolant Temperature
Drive Axle Oil Temperature Gauges
NOTICE
A sudden increase in oil temperature that is not
caused by a load increase may indicate mechani-
cal failure. Bring the vehicle to a safe stop and
investigate the cause to prevent further damage.
Do not operate the vehicle until the cause has
been determined and corrected.
During normal operation, drive axle oil temperature
gauges should read as follows:
•
160 to 220°F (71 to 104°C) for Detroit
™
and
Meritor
™
drive axles
•
180 to 200°F (82 to 93°C) for Dana Spicer®
drive axles
Under heavy loads, such as when climbing steep
grades, temperatures that exceed the normal oil tem-
perature range for a short period are not unusual. If
the temperature returns to normal when the load de-
creases, there is no problem. See
Fig. 3.38.
f61138010/31/2016
Fig. 3.36, Application Air Pressure Gauge
f61178008/16/2019
Fig. 3.37, Analog Coolant Temperature Gauge - ICUC
f61138410/31/2016
Fig. 3.38, Drive Axle Oil Temperature Gauge (rear drive
axle gauge shown)
Instruments
3.21
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