The most important part of the air compressor is the oil filter. A good oil filter can remove the impurities in the air compressor oil in time to ensure the normal use of the air compressor. Air compressor oil filter is a device used to filter oil, is a kind of wear parts. The role of air compressor oil filter: filter out the metal particles and impurities in the air compressor lubricating oil, ensure the cleanliness of the oil circulation system and protect the safe operation of the main engine. The harm of overdue use of air compressor oil filter: 1, insufficient oil return, resulting in high exhaust temperature, shorten the service life of oil and oil core; Lead to insufficient lubrication of the main engine, seriously shorten the life of the main engine; 2. After the filter element is damaged, the filtered oil containing a large number of metal particle impurities enters the main engine, resulting in serious damage to the main engine.