I am experiencing a bit of trouble trying to figure why my drive belt is so loose. The manual says you should have an 1/8" of play, but mine sags all the way to the bottom of the cover. I have adjusted the belt tension wheel and that does not help it. I purchased a new belt and it is the same size as the old one. The chassis brace is still in tact, so I don't know where else I can adjust it. Has anyone else had this problem?