PIN 2168483 - Caterpillar

Always replace the secondary filter element. Never attempt to reuse it by cleaning.The secondary filter element should be replaced at the time the primary element is serviced for the third time.The secondary filter element should also be replaced if the yellow piston in the filter element indicator enters the red zone after installation of a clean primary element, or if the exhaust smoke is still black.
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Open the engine hood. Access the air cleaner from the left side of the machine.
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Loosen the clips which hold air cleaner housing cover (1). Remove the air cleaner housing cover.
Remove primary filter element (2) from the air cleaner housing.Reference: For the proper procedure, refer to Operation and Maintenance Manual, "Engine Air Filter Primary Element - Clean/Replace".
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Remove the secondary filter element.
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Cover the air inlet opening. Clean the inside of the air cleaner housing.
Inspect the gasket between the air inlet pipe and the air cleaner housing. Replace the gasket if the gasket is damaged.
Uncover the air inlet opening. Install a new secondary filter element.
Install the primary filter element and the air cleaner housing cover. Fasten the clips in order to secure the air cleaner housing cover.
Close the engine hood.