Murray tractor model 42590x92a diagram needed.

Hi,
Thanks for giving the model number, and happy to oblige. How about a link to the entire pdf parts breakdown at:
http://www.outdoordistributors.com/pdf/Murray/MURRAY-MODEL-42590X92A-LAWN-TRACTOR-(1998)-PARTS-LIST.pdf
Or another one that is separate HTML pages at:
Murray lt Parts Diagram Index for 42590X92A (http://partsandservice.com/html/Murray/lt/lt42590x92a.html)
The first is a mere 16 pages and only 173 KB, the second seems to be 26 but appears to have 6 duplicated pages.
Your machine is a Wal*Mart machine and the second version of that model made for them. The 92 tells me the first and the A tells me the second.
Peace,
Clarke