can be mounted on the dash, usually on the right-
hand control panel.
NOTE: Rain or snow can wet the filter and
cause a temporary high reading.
Air intake restriction vacuum is measured in inches
of water (inH
2
O). For vehicles equipped with a
graduated indicator or a restriction gauge on the
dash, check the gauge with the engine off. If the yel-
low signal stays locked in the red zone once the en-
gine is shut down, or is at or above the values
shown in
, the air cleaner element needs to
be replaced.
Vehicles may be equipped with a go/no-go restriction
indicator without graduations (see
) instead of
a graduated indicator.
Air Intake Maximum Restriction Values (inH
2
O)
Engine Make
Pre-EPA07
Engines
EPA07 and
EPA10
Engines
GHG14
and
GHG17
Engines
Detroit
20
22
18
Cummins
25
25
25
Mercedes-Benz
22
22
–
Caterpillar
25
–
–
Table 3.2, Air Intake Maximum Restriction Values
Ambient Temperature Gauge
The ambient temperature gauge, shown in
displays the in-cab or outside temperature, depend-
ing on the settings selected.
When the alarm is enabled, the ambient temperature
gauge will sound an audible alert and the amber
lamp will illuminate when the outside or inside tem-
perature (depending on the setting selected) reaches
the set temperature. Turn the alarm on and off using
the steps below.
1.
Press the IN button for in-cab temperature, or
the OUT button for outside temperature.
2.
Press the SET button.
3.
Press the ADJ button until the desired tempera-
ture is displayed.
4.
Press the ALARM button and "AL" will appear on
the display.
5.
Press the SET button to return to the current
temperature display.
NOTE: To turn the alarm off, press the ALARM
button again and "AL" will disappear from the
display.
02/12/2015
f090514
Fig. 3.6, Air Intake Restriction Indicator
04/08/2005
f090431
Fig. 3.7, Manual-Reset Air Restriction Indicator, Go/
No-Go
SET
ADJ
ALARM
IN
OUT
12/14/2011
f611153
Fig. 3.8, Ambient Temperature Gauge
Instruments
3.10
