Operating and Maintenance Manual 09/2019 – part I
Screw compressors
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8.3 Basic components requiring maintenance and descriptions of
maintenance operations.
8.3.1. Air filter cartridge
The cartridge is located in the complete air filter assembly mounted on the suction side of
the screw block. Do not soak the filter cartridge in oil or other liquids.
Maintenance procedure:
- Stop the compressor and close the pressure conduit valve.
- Switch off the power supply and take measures to prevent it from being unintentionally
switched on again by unauthorised persons.
- Verify that the machine has been de-energised (0 V).
- Wait minimum 5 minutes and then open the compressor guard.
- Check that the system has been emptied by slowly unscrewing the oil filler cap (use
protective clothing) (Fig.13). The compressed air can be hot.
- Open the filter cover and carefully remove the dust.
- Take the cartridge out, clean it or replace with a new one, if necessary.
- Cleaning by rinsing: do not apply force; in case of the cartridge damage, replace it with a
new one.
- Clean the contact surfaces of the seals.
- Cleaning by blowing: blow the cartridge surface with dry compressed air, at the pressure of
up to 0.5 MPa, in askew direction starting from its inside and then outside.
- Mount the filter cover, paying attention to its correct position during installation.
- Start the compressor and check for correct operation.
Fig. 13 Oil filler cap
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