NUT,TUBE COUPLING 2R7819 - Caterpillar

Fresh Air Filter
Note: The cover for the cab air filter is located on the left-hand side of the machine behind the cab.
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Rotate the latch to free the cover from the ductwork. Do NOT use excessive force. Lift up on the cover and remove the cover.
Remove the air filter element from the duct and clean the filter element with low-pressure air (maximum 207 kPa (30 psi)). Direct the air flow up the pleats and down the pleats from the side of the filter opposite of the air flow. Replace the element if the element is damaged or if the element seal is damaged. Replace the element if the air conditioner performance is low. Note: Do not use water for cleaning the filter.
Install the element. Replace the cover and tighten the thumb screw. Recirculation Filter
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Turn the thumb screws until the thumb screws are free from the duct. Remove the cover.
Remove the air filter element from the duct and clean the filter element with low-pressure air (maximum 207 kPa (30 psi)). Direct the air flow up the pleats and down the pleats from the side of the filter opposite of the air flow. Replace the element if the element is damaged or if the element seal is damaged. Replace the element if the air conditioner performance is low. Note: Do not use water for cleaning the filter.
Install the element. Replace the cover and tighten the thumb screws.