© Edwards Limited 2007. All rights reserved. Page 29
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Maintenance
A344-02-880 Issue J
5.6 Replace the gas-ballast filter
You must replace the gas-ballast filter elements every time you change the oil in the pump (see Figure 9).
1. Isolate the pump from your electrical supply.
2. Unscrew and remove the M6 x 16 mm long socket-head screws securing the gas-ballast bearing-plate (2).
3. Note the orientation of the bearing-plate before removing it so that you can replace it correctly later.
4. Remove the bearing-plate containing the two filter elements from the valve body.
5. Slide the two filter elements off the bearing-plate and discard them.
6. Clean the bearing-plate assembly before fitting new filter elements by washing it in a suitable cleansing
solution. Allow the assembly to dry.
7. Fit two new filter elements to the bearing-plate.
8. Replace the assembly into the valve body in the correct orientation and secure with the two screws removed
earlier.
9. Reconnect the electrical supply to your pump.
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