CASE A.6B4290 7B2119 - Caterpillar

Always replace the secondary element. Do not attempt to reuse it by cleaning. Engine damage could result.
Note: Replace the engine air filter secondary element when you service the engine air filter primary element for the third time. Replace the secondary filter element if the exhaust smoke remains black and the clean primary filter element has been installed.
Park the machine on a level surface and stop the engine. Make sure that the transmission control is in the PARK position.
Remove the air filter cover and remove the primary filter element from the air filter housing.
Illustration 1 g00644798
(1) Secondary filter element
Remove secondary filter element (1) and properly discard the secondary element.
Cover the air inlet opening. Clean the inside of the air cleaner housing.
Uncover the air inlet opening. Install the new secondary filter element.
Install the primary filter element and install the air filter cover.