http://www.ytmag.com/nboard/wwwboard1.html
The above is where you can get all the info on your 9N you could wish for. As to a direct answer to your question. Use straight grade 30, 40 or 50 weight depending on your climate and engine condition/oil pressure on your guage. The tranny/hydraulic system uses either #90 mineral oil or the modern 134 hydralic oil.

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