Coolant Temperature Gauge
NOTICE
A sudden increase in coolant temperature may
indicate engine or cooling system failure. Bring
the vehicle to a safe stop and investigate the
cause to prevent further damage. Do not operate
the engine until the cause has been determined
and corrected.
During normal engine operation, the coolant tem-
perature gauge should read 175 to 195°F (79 to
91°C). If the temperature remains below 160°F
(71°C), inspect the cooling system to determine the
cause.
For Detroit engines, if coolant temperature rises
above the maximum temperature listed in
Table 3.4,
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)
Detroit 215 (101)
Table 3.4, Maximum Coolant Temperature
Engine Oil Pressure Gauge
NOTICE
A sudden decrease or absence of oil pressure
may indicate mechanical failure. Bring the vehicle
to a safe stop and investigate the cause to pre-
vent further damage. Do not operate the engine
until the cause has been determined and cor-
rected.
The engine oil pressure gauge displays the current
engine oil pressure. If engine oil pressure falls below
the minimum levels shown in
Table 3.5, the CHECK
engine lamp on the driver display will illuminate. If
the condition does not improve, the STOP engine
lamp will also illuminate and an audible warning will
sound. The engine will then derate or shut down, de-
pending on the type of engine protection system in-
stalled.
NOTE: Oil pressures in Table 3.5 are given with
the engine at operating temperature. With the
engine cold, oil pressure may be higher. Indi-
vidual engines may vary from the listed pres-
sures; observe and record pressures when the
engine is new to create a guide for checking
engine condition.
Minimum Oil Pressure
*
Engine Model
At Idle Speed:
psi (kPa)
At Rated RPM:
psi (kPa)
Cummins 15 (103) 35 (241)
Detroit 14 (97) 55 (350)
*
Oil pressures are given with the engine at operating temperature. With
the engine cold, oil pressure may be higher. Individual engines may vary
from the listed pressures; observe and record pressures when the engine
is new to create a guide for checking engine condition.
Table 3.5, Minimum Engine Oil Pressure
Engine Oil Temperature Gauge
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 engine until the cause has
been determined and corrected.
During normal operation, the optional engine oil tem-
perature gauge should read in the following tempera-
ture range:
•
200 to 260°F (93 to 126°C) for Detroit and
Cummins engines
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.
Transmission Oil Temperature Gauge
The transmission fluid temperature gauge measures
the transmission lubricant operating temperature.
Temperatures vary by application, but the transmis-
sion fluid temperature gauge reading should not ex-
ceed 250°F (121°C).
NOTICE
A sudden increase in transmission fluid tempera-
ture that is not caused by a load increase may
indicate mechanical failure. Bring the vehicle to a
Instruments
3.33
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