HOSE AS 4327055 - Caterpillar

Cleaning Primary Air Filter Elements
Caterpillar does not recommend the cleaning of air filter elements since there is not a relatively feasible and reliable method of inspecting air filter elements for damage. A damaged air filter element can allow dirt to pass through, which results in reduced efficiency.Cleaning the air filter element will result in a progressive reduction from the original filter capacity each time the filter is cleaned. However, if the owner insists on cleaning primary air filter elements to extend filter life, the following instructions may help to minimize the risks.Do not clean the air filter elements by bumping or tapping as these actions can cause damage. Do not use air filter elements with damaged pleats, gaskets, or seals. Discard damaged air filter elements.Do not use solvents or water to wash the air filter element.When attempting to clean the primary air filter element, use a maximum gauged air pressure of 207 kPa (30 psi) at a minimum distance of 75 mm (3 inch) for at least 3 minutes. Do not aim the high-pressure air stream directly at the filter media, but rather so the air flows along the length of the filter media surface. Take extreme care during this procedure to help prevent damage to the filter element and to prevent forcing dirt further into the pleats. This procedure may be used for a maximum of three cleanings before filter element replacement.The engine air filter secondary (safety) element should never be cleaned and should be replaced every third primary air filter element change, or as required.Never attempt to replace a filter element while the engine is running.
Due to the lack of a feasible and reliable filter element inspection procedure, the customer is encouraged to closely monitor the engine S O S (scheduled oil sampling) as the best means to detect dust ingestion into the engine. Refer to the Operation and Maintenance Manual for more details.
Note: Caterpillar is not responsible for damage to the air filter elements and/or contingent damage to Caterpillar equipment due to unauthorized air filter cleaning. Any cleaning of air filter elements voids the Caterpillar Parts Warranty associated with the parts.