COUPLING 3731989 - Caterpillar

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Squeeze the outlet tube slightly in order to purge the dirt from the outlet tube.
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Loosen the three cover latches and remove the air cleaner cover.
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Remove the primary filter element from the air cleaner housing.
Clean the air cleaner cover and the inside of the air cleaner housing.
Inspect the O-ring seal on the air cleaner cover. Replace the O-ring seal if the O-ring seal is worn or damaged.
Do not clean the filter elements by bumping or tapping them. Do not use filter elements with damaged pleats, gaskets or seals. Engine damage can result.Make sure the cleaned filter elements are completely dry before installing into the filter housing. Water remaining in the elements can cause false indications of contamination in Scheduled Oil Sampling test results.
Clean the primary filter. Inspect the primary filter. Primary filter elements can be cleaned with pressure air, pressure water or a detergent washing.When pressure air is used, the maximum air pressure should not exceed 205 kPa (30 psi). When pressure water is used, the maximum pressure should not exceed 280 kPa (40 psi).Refer to Operation and Maintenance, "General Hazard Information" before you use pressure air in order to clean the primary filter element.
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Direct the air or the water along the pleats inside the primary filter element and outside the primary filter element.The primary filter element can be washed in warm water and nonsudsing household detergent. Rinse inside the pleats and outside the pleats. Allow the primary filter element to air dry fully.
Inspect the primary filter element after cleaning. Do not use a primary filter element with damaged pleats, damaged gaskets or damaged seals.
Encase the clean primary filter element and store the clean primary filter element in a clean, dry place.
Install the clean primary filter.
Install the air cleaner cover and close the latches securely.
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Note: Install the air cleaner cover properly. The arrows must point upward.
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Reset the filter indicator by pushing in the reset button on top of the indicator.
Change the filter if any of the following conditions occurs:
Restricted Air Filter indicator on the monitor panel still comes on.
Exhaust smoke is still black after the installation of a primary filter.Note: The primary filter can be cleaned up to six times. Replace the primary filter if the primary filter has been in service for one year.
Close the access door on the left side of the machine.