I had one of those 10-80 disc plows for a few years and did not like it. It did not plow deep enough and did not turn the sod I was breaking over very well.
I sold it and went back to a moldboard plow.
It would take a whole page to explain the reason I can not post a link to the website below.
But if you go there and look under manuals they have an original owners manual scanned for that plow that you can download.