Really is easy. just take off back cover and hold slotted shaft with 3/8 in wrench, then unscrew impeller
The impeller is screwed on like a bottle cap. On a sq flange motor, it is harder to do. the armature spins when you try to remove the impeller. you can try to use needle nose vise grips to keep it from spinning by gripping the shaft from underneath (between pump and motor) then try unscrewing the impeller. If this does not work, You will have to remove the armature. their are 4 thru bolts that can be removed from the back of the motor. they are each about a foot long. WD40 the place where the connect to the pump housing or you may break the housing. When removed, you can tap the rear of the armature with a hammer and chisel. when it pops free, remove the armature from the motor. you now have in your hand, the pump still attached to the armature. you can place the armature in a vise, (make sure you do not damage it) then use channel lock pliers to unscrew the impeller. The impeller may still break. Or you can try and place a wedge in the pump housing to keep the impeller from moving and turn the armature. good luck, it is not an easy job.
SOURCE: I have a US!1102 AO
I have never taken this pump apart.
If I were in your position and I could move the impellar 1/8 turn, the next thing that I would do is carefully loosen the nut on the end of the shaft being careful that nothing else disassembles. Once this nut is loose say 2 turns, try the impellar again watching what is moving. It seems that the nut may have to be removed.
Also, I'm not sure which way the nut of the impellar rotates to remove, but you seem to have that under control since you have it moving already.
Gary
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