I had the same thing happen to me with a little giant 3md last year. take the impeller cover off and see if you can turn the motor shaft, if it turns with a lot of resistance then one of the bearings is probably beginning to seize. In my case it was because one of th oil holes on top became plugged with lint etc. I cleaned the hole with a piece of wire and added about 10 drops of oil. I guess I managed to get to it in time because after a couple of turns of the shaft with my hand the bearing worked itself loose and the pump still continues to run to this day. Of course make sure the impeller and cover are cleaned of any calcium deposits
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-=Bryan=-
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