Operation and maintenance manual
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AirCleanerRestriction
Check
Maximum intake air restriction is 635 mm [25.0 in.] of
water for turbocharged engines. Naturally aspirated
engines have a maximum restriction of 510 mm [20.0
in.] of water.
Turbocharged engines must be operated at rated RPM
and full load to check maximum intake air restriction.
Replace the air cleaner element when the restriction
reaches the maximum allowable limit or clean according
to the manufacturer's recommendations.
NOTE: Follow the manufacturer's instructions when
cleaning or replacing the air cleaner element.
Check the air cleaner service indicator, if equipped.
Change the filter element when the red indicator flag (2)
is at the raised position in the window. (1)
After the air cleaner has been serviced, push the button
(3) to reset the service indicator.
NOTE: Never operate the engine without an air cleaner.
Intake air must be filtered to prevent dirt and debris from
entering the engine and causing premature wear.