Hello new to the forum here and looking for some advice. My 1.5hp dynamo pump started humming the other day. I have taken it apart and found this motor has no capacitor which would have been the easy fix. I can get the motor to start with impeller off but have to help the motor by spinning the shaft. although there is something wrong there it would be fine with me if that's all i had to do. My real issue comes when i put the impeller back on. It screws too tight against the diffuser causing it to rub. I am wondering if it could be the spring loaded seal is worn down? The motor, impeller,and diffuser seem to be in very good condition as well as the seal but i don't know Any ideas are greatly appreciated.