Maximum Air Intake Restriction Values
Engine Make Initial inH
2
O
Service inH
2
O
Detroit Diesel 10 22
Table 4.4, Maximum Air Intake Restriction Value
Brake Application Air Pressure Gauge
The application air pressure gauge registers the air
pressure being used to apply the brakes, and should
be used for reference only. The gauge will not regis-
ter until the foot pedal is depressed or the hand
brake lever is applied.
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.
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 engine oil temperature
gauge should read from 200 to 260°F (93 to 126°C).
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 Fluid Temperature
Gauge
The transmission fluid temperature gauge measures
the transmission lubricant operating temperature.
Transmission temperatures vary by application, but
the transmission fluid temperature gauge reading
should not exceed 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
safe stop and investigate the cause to prevent
further damage. Do not operate the vehicle until
the cause has been determined and corrected.
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.
Turbocharger Boost Pressure Gauge
The turbocharger boost pressure gauge measures
the pressure in the intake manifold being created by
the turbocharger, in excess of atmospheric pressure.
Driver Message Center
ICU4
Functions
The mode/reset button, located on the right side of
the lightbar, controls the driver message center.
Press the mode/reset button to advance one screen;
hold the button down to select a menu choice or
reset the display. When the display is reset, an au-
dible chirp sounds.
Direct Access Screens
When the parking brake is not set, pressing the
mode/reset button will scroll through the direct ac-
cess screens.
Instruments
4.11
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