I replaced the belts on my Troybilt riding lawnmower in doing this I had to loosen the PTO box and drop it down on a solid surface, but now that I have put my lawnmower back together my PTO will not work. It just makes a clicking sound. I have checked to see if it was getting any electric and it was. I have lowered it down and put it back in again too. Does anyone have any idea what I need to do next? I would appreciate any help you could give me. Thanks.