FAN 1421931 - 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.
Service the air cleaner only with the engine stopped. Engine damage could result if the air cleaner is serviced while the engine is running.
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Release the 3 clips on the air cleaner housing cover. Remove the air cleaner housing cover.
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Remove the primary filter element.
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Remove the secondary filter element.
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 element.
Install the primary element.
Install the air cleaner housing cover and install the clip.
Reset the engine air filter service indicator.