I think my current belt is way to loose. It's not in bad shape but whenever I disengage the blades and lift the lever up the belt comes off the pulley. Then when I engage it dont come on and I get down and look the belt is off. I need a new belt that has not been stretched I think. My spring is little loose but long as the belt is on the pulley it works fine,but when blades not turned on belt has alot slack in it.