It may be too late for the pump motor if you have been hammering on the motor. The shaft can easily be bent and the shaft seal is almost certainly ruined. There are two impellers slid up on that shaft sitting on keyways and both are held on by a 3/4" head nut on the bottom of the motor shaft. That's why the motor won't come off. If you bent the shaft which is about 6-7" long, you are out several hundred dollars for a new motor. That pump uses a motor that no other pump in the world uses. So the price is high.
You need to go down to the bottom of the pump (by standing on your head) to see the two bolts I am talking about.
I may have steered you wrong on the number of bolts holding the motor to the seal plate, (where you took them out) there may be only two. I just can't remember for sure.
bob...