You can get some fragmentary information here: http://www.partstree.com/parts/?lc=murray&mn=40563x88A+Lawn+Tractor+%281998%29&dn=7634&dzl=14
I found it useful: I now know that you have a belt drive mower, for instance, and it probably wouldn't be all that hard to find the manual for another Murray mower that looked similar if not identical.
