SPRING 0006391 - 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.
Do not use the filter for longer than one year.
Always leave the secondary filter element in place while you clean the primary element, or while you clean the air cleaner housing.
Illustration 1 g01141636
Open the engine access door, if equipped. The engine access door is located on the left side of the machine outside the operator's compartment.
Remove the air cleaner housing cover.
Remove the primary filter element.Reference: Refer to Operation and Maintenance Manual, "Engine Air Filter Primary Element - Clean/Replace".
Cover the air inlet opening. Clean the inside of the air cleaner housing.
Inspect the gasket between the air inlet and the air cleaner housing. If the gasket is damaged, replace the gasket.
Illustration 2 g00470240
Uncover the air inlet opening. Remove the secondary filter element. Pull out in order to remove the element.
Install a new secondary filter element. Push the element firmly in order to properly seat the element. Write the date on the new primary filter element, when you install the primary filter element in the machine.
Install the primary filter element and the air cleaner housing cover. Tighten the bolts for the air cleaner housing cover finger tight. Do not use a tool to tighten the bolts for the air cleaner housing cover.
Close the engine access door, if equipped.