I have 550, so I'm not sure about the 750's, but after I got my bearing retainer off, I simply used a piece of 1/2" steele rod and pounded them out. You have lay thh wheel down and go throu the top. You can use the rod to pry the bearing spacer over a little so you can get a lip on the bearing down below. Once you do that, start pounding (within reason of course). It took a couple cracks before mine moved at all. Switch to the other side of the bearing and repeat. Switch, repeat. Once you get the one side out, the other is much easier.
I think I remember something about the 750's having three rear bearings? I have no idea. The 550 only has two.
Hope this helps. I hope I'm not way off here.