Xylem Flygt 2620.172 Service And Repair Instructions page 26

4 Maintenance
3. Turn the pump so that the oil hole faces downwards and let the oil run out into a
container.
Some oil will be left in the oil housing.
24
CAUTION: Compressed Gas Hazard
Air inside the chamber may cause parts or liquid to be propelled with
force. Be careful when opening. Allow the chamber to de-pressurize
before removal of the plug.
2620.172/.281 Service and Repair Instructions