I think youre looking at the filter rather than the pump.
Pump removal: power off, drag machine out onto the floor, remove back cover or tip machine up at an angle, locate pump, (attached to other end of drain pipe).undo 2 wiring connections, 2 hose connections, and pump mounting screws. Remove pump chamber - some are held in with screws, others clip into place. Check for foreign objects round the impeller. If pump chamber is clear, may be a fault with the pump motor - in which case, replace the pump.
Repair and service your own washing machine. Go to www.2ndwave.co.uk/manual.html
dannyboy, December 2008