Have a Troy bilt Horse 2010. The trans drive belt twists itself around, then comes off. All the pulleys & bearings look good, the belt seems OK. I have a new belt to use as a last resort. I tried to get the idler pulley off (the one on the bracket), & the whole shaft turns, same w/ the bracket. There's no way to get at the other end of the shaft to keep it from turning,w/o maybe having to take the body off, so I can weld the ends The engine is speeding up & slowing down on its own, hunting? Maybe a governor prob? Can't replace belt till I can get idler pulleys off.