The tensioner (the lever that you depress to turn the beater bar off has a metal tab that enables this. If the lever is not in the complet up/off position, the metal tab will rub against the belt and burn it out in no time. Have someone handy with a hack saw cut the tab off, thus enableing you to never us the function again, but it will allow you to save tons of $ on belts. I have the same model for 10 years now and no problems since I cut that tab off!
Jason in Bethlehm, PA, January 2010