Last year, we have had a few episodes of the pump humming instead of turning. We would need to punch it with a soft malet a couple of times so it would start. After reading a few post regarding humming pumps, we would like to change the "capacitor" but we have no clue as to where the part is in the pump or what the "capacitor" part number would be. I have attached the exploded drawing of the pump. Can anyone give me some pointers?