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SECTION 3 – INSTRUMENTS, INDICATORS, AND SWITCHES
Air Cleaner Restriction Indicator
Air restriction is resistance of airflow through the air cleaner.
Accurate air restriction is measured at maximum airflow.
Figure 24 Air cleaner restriction indicator
Air cleaner restriction is measured by an air restriction indicator.
The restriction indicator may be located anywhere within the air
induction system or instrument panel depending on your specific
application.
Page 44
Air Restriction Indicator Calibration
•
The indicator is calibrated in inches of water.
•
The indicator should be tested periodically (using a
master vacuum gauge) to ensure a correct calibration.
Air Restriction Indicator Operation
•
The yellow position indicator progressively fills the
window as air filter restriction increases, locking at the
highest restriction at full load.
•
When the yellow position indicator reaches and locks in
the red zone, a new air filter element should be installed.
NOTE: If the yellow indicator locks in the red zone, it is
not necessary to shut down the engine immediately, but
a new air filter element should be installed at the earliest
convenience.
Air Restriction Indicator Reset
•
Once the filter has been changed reset the air restriction
indicator as follows:
•
Push the button on the indicator to reset.
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