You can fix it,there s 4 bolts at the back of the pump,remove that,inside there s round piece of metal in the centre of the pump working as a bearing,it has 10 metal fragments sloted around it,those metal fragments tend to break and cause the shaft not to turn,YOUR EASY FIX,WILL BE TO OPEN THE PUMP AND REMOVE LOOSE METAL PIECES that fell inside the pump.[/i]