BASE-VALVE COVER 3588899 - Caterpillar

Always replace the secondary filter element. Never attempt to reuse the element by cleaning.The secondary filter element should be replaced at the time the primary element is serviced for the third time.
Open the engine enclosure.
Illustration 1 g01001933
Slide out retaining clip (1) .
Release cover (2) from air filter housing (3) by rotating counterclockwise. Remove the cover from the housing.
Remove primary element (4) from filter housing (3). To avoid dislodging any dust, take care to avoid touching the element against the sides of the housing.
Remove secondary filter element (5) .
Cover the air inlet opening. Clean the inside of the air cleaner housing.
Uncover the air inlet opening. Install a new secondary element.
Install the primary element and the air filter cover.
Close the engine enclosure.