Here's an answer that contains a link to the PDF of the Operators Manuel: http://www.ifixit.com/Answers/View/16172/Need+to+replace+mower+blade+belt
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If this is not your machine, go to this link and enter your machine number for the PDF download on all the parts, most belt routings are around page 10: http://search.cartserver.com/search/search.cgi?cartid=a-8671&category=MurrayPDF&maxhits=5&keywords=40504X92&go=GO%21