SEAL-LIP TYP 5567544 - Caterpillar

Always replace the secondary filter element. Never attempt to reuse the secondary filter element by cleaning the element.When the primary filter element is replaced, the secondary filter element should be replaced.The secondary filter element should also be replaced if the restricted Air Filter indicator comes on after the installation of a clean primary filter element or if the exhaust smoke is still black.
Note: See Operation and Maintenance Manual, "Engine Air Filter Primary Element - Clean/Replace" for information that pertains to the removal of the air cleaner cover and the removal of the primary filter element.
Remove the air cleaner cover from the air cleaner housing.
Remove the primary filter element from the air cleaner housing.
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Remove the secondary filter element.
Cover the air inlet opening.
Clean the inside of the air cleaner housing.
Remove the covering from the air inlet opening.
Install the new secondary filter element.
Install the primary filter element.
Install the air cleaner cover and close the latches securely.
Close the access door.