Do you know when to replace air compressor filter elements?

The three core filter consumables for air compressors comprise the air filter oil filter, and oil-gas separator element, collectively known as the air compressor’s ‘three filters’. These components are subject to wear and tear; as usage time increases, their filtration performance gradually diminishes, thereby impacting the air compressor’s operational efficiency and overall lifespan. Below are the reasons for replacing air compressor filter elements and specific step-by-step instructions.

I. Reasons for Air Filter Replacement:

The air filter serves as a vital protective barrier for the air compressor, effectively removing dust, particles, and other contaminants from the air supply. This prevents these impurities from entering the equipment, which could disrupt operation and shorten lubricant lifespan. Clean air helps safeguard the engine and other core components.

Replacement Procedure:

1. Shut down the machine and disconnect the power supply;
2. Loosen the wing nut, remove the old filter element, and clean the filter housing (avoid using compressed air);
3. Insert the new filter element, reassemble, and verify correct installation before restarting the equipment.
   Replacement is recommended every 2000 operating hours, though the interval may vary depending on the operating environment. If the differential pressure reaches -0.05 bar triggering an alarm, immediate replacement is required.

II. Reasons for Oil Filter Replacement:

The oil filter element removes metal particles, contaminants, and sediment from the oil, maintaining oil cleanliness to ensure proper lubrication and cooling system operation. A clogged or failed oil filter may cause equipment overheating and shorten the air compressor’s service life.
Replacement Procedure:

Replacement Procedure:

1. Shut down the unit and relieve system pressure, taking care to avoid burns from hot oil;
2. Unscrew the old oil filter and replace with a new element;
3. Apply oil to the seal ring before installation to ensure proper sealing, then tighten securely;
4. Start the machine and verify no leaks before resuming operation.
   It is recommended to replace the oil filter every 2000 operating hours or concurrently with lubricant changes.

III. Oil-Air Separator Element Replacement Reasons:

The oil-air separator element separates oil from compressed air to ensure clean output air while recovering oil for reuse.

1. Shut down the unit and verify the anti-static device on the new filter element is operational;
2. Disconnect the flexible hoses, copper pipes, return oil line, and cover plate;
3. Remove the old filter element, clean the separator housing, install the new filter element, and reassemble in sequence;
4. Ensure the return oil line is inserted to the base of the filter element. Test the unit after installation;
5. Take care to prevent foreign objects from entering the oil drum during operation.
   Replacement is recommended every 4,000 operating hours, subject to adjustment based on usage conditions.

The air compressor’s ‘three filters’ ensure the cleanliness and purity of various fluids through filtration and purification. This extends the service life of mechanical equipment and engines, enhances operational efficiency, reduces maintenance costs, and minimises emissions. Consequently, regular replacement of air compressor filter elements is a crucial measure for maintaining the performance of mechanical equipment and engines.