Hi guys! I am a retired engineer living in Ocala, Fl and am new to the form. I guess I’m much like most retirees. Play bocce, pocket pool, build and fly RC airplanes and of course eat out. Sorry no golf! Also, I have been mowing my lawn with my Troy-Bilt Bronco for five years and yesterday it decided to throw off the drive tension belt. I managed to get the belt back on the tension pulley and continued to mow. A few minutes later the belt popped off again. The belt looks ok. Since I’m an engineer, I don’t know everything, especially when it comes to belts and pulleys! Does anyone have an idea why this is happening? Would appreciate any suggestions!