I also have one that has bit the bullet. I have looked at mine after trashing the pump. I would almost bet they are a shrink fit. Heating it to get it off would probably destroy the front bearing. They usually induction heat these parts and just place them on the shaft. If you can see the end of the motor shaft you can pull it with a puller and a bearing plate. if you cant see the end of the motor shaft consider drilling the eccentric crankshaft, then pulling. I use mine as an auxiliary tank for now.
Where there's a Willis there's a way!