I. Replacement of the Oil Filter Element

1. Unscrew and discard the oil filter element.

2. Thoroughly clean the filter housing and unclog the pressure difference through-holes at the inlet and outlet.

3. Inspect the performance of the pressure difference transmitter.

4. Apply oil to the new filter element (coat a thin layer of oil on the filter element's sealing ring).

5. When installing the filter element, screw it until it contacts the gasket, then hand-tighten an additional 1/3 turn.

6. After startup, check for any leaks.

II. Replacement of the Oil-Air Separator Filter Element

1. Remove all connecting hoses and copper pipes from the minimum pressure valve.

2. Dismantle the copper pipe of the oil return line.

3. Take off the cover plate.

4. Pull out the filter element.

5. Clean the cylinder body.

6. Fit the new filter element and reassemble all components in the reverse order of disassembly.

Cleaning of the Three Filters for Air Compressors

To prevent premature wear of the screw compressor and clogging of the fine filter element in the oil-air separator, the air filter element should be cleaned or replaced after 500 hours of operation; the replacement interval shall be shortened in dusty areas. The compressor must be shut down for filter replacement. To minimize downtime, it is recommended to install a new or pre-cleaned spare filter element.

Key Notes for Cleaning the Three Air Compressor Filters

The three filters of air compressors are paper filter elements. Except for the air filter element, which can be reused after cleaning, it is best to replace the others with new ones. For metal filter screens and elements, clean them only with clean oil, a soft brush or an air gun to blow out contaminants—never use fire for cleaning.

1. Tap the two end faces of the filter element alternately against a flat surface to remove most heavy, dry dust.

2. Use dry compressed air with a pressure of less than 0.28 Mpa to blow the filter element in the reverse direction of air intake. Keep the air nozzle at least 25 mm away from the pleated paper and move it up and down along the height of the filter element.

3. Inspect the filter element and discard it immediately if thinning, pinholes or damage are found.