I have an 809 High Flow that I got through more beer about a year ago now. A couple months ago it stopped working. I took the head apart, cleaned everything out and put it back together, oiled the bearings and did a quick check to see if it worked, motor turned on and the impeller turned. I thought that was the end of it. Tried to pump some water and the motor turned, I got an initial surge, but then nothing would pump through. I took the head apart again and found that the impeller was sticking on end of the shaft took some 1200 grit sand paper to the shaft and polished it a little, impeller now turns freely on any part of the shaft. Turned on the pump, same thing, initial surge and then nothing. The pump is definitely primed, it seems to be decoupling from the impeller somehow. What should I look for to try and replace? Bad magnet?
Any help would be appreciative.