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520H help for a rookie

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Boy oh boy I love my 520H but I can not seem to find/read some of the numbers on it to look up my tractors info. It has a 20hp Onan that will need work soon. The tractor it self needs work. I am going to fully restore it but can't  look for parts cuz I have no info on it. ANY help would be greatly appreciated.  Under the seat I find I.D # 3120OE01, then 15426 and what I can read of 9264???.



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E01 indicates 1988  the first year for the 520.  there was also a 520-HC of the same year that was the commercial version

any pictures of the whole tractor?

if know about Onan, you know to clean the cool fins of all the grass on the rear cylinder.

also on the later Onans there was a rubber oil filter seal to help seal the engine tin and promote better cooling. 

they are only a few dollars but well worth it.

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