PISTON AS 1G7331 - 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 cleaned for the third time, 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.
Remove the primary filter element and the cover. See the Operation and Maintenance Manual, "Engine Air Filter Primary Element - Clean/Replace".
Illustration 1 g00323623
Remove the secondary filter element.
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 filter element and the cover. See Operation and Maintenance Manual, "Engine Air Filter Primary Element - Clean/Replace" for the necessary steps.