MB hasn't got the bearing listed as a separate part, but at Ganzeboom (the link Army provided, thanks) has it as a separate part:



Number 34 I think.

But do you need machine-shop tools to put it in (and get the old bearing out)? Or is it pressed in? I don't know the size at the moment, it is still in the pump.

The cog wheel and ring cog seem fine to me, but what do I know.



UPDATE: Ganzewinkel was called, bearing is about €6 and can be pressed in. The only question remaining is why the bearing is damaged in the first place, that can be caused by too much play on the pump cog wheels.