We bought this tractor used with both the mower deck and a snowblower attachment. The previouse owner gave us the belt for the snowthrower attachment and we have all manuals. the belt seemed too small went and bought another one that seemed alittle big (from a dealer). Long story short we have shredded three belts and can't figure out why. Anyone else having these problems? Is there a retrofit for a pto shaft instead of the belt and pully system?