90 GV 640 Service Manual
For internal use only
8.11.1 Removing the non-return valve
This is only possible if:
- the outer door has been removed;
- the base panel and the sheet metal have
been removed;
- water has been drained out of the pump
cavity;
- the discharge hose has been taken out of the
pump cavity.
8.11.2 Installing the non-return valve
Scratches!
When removing the non-return valve,
the inside of the discharge connecting
pipe may not be scratched if you use a
sharp-edged screwdriver.