air reel or not? tall beans or not? think you can go 4mph as long as you have good knives and guards.
the header is usually the limiting factor its not the combine itself in beans I found, we usually drive 3.5 to 3.9 but we have lots of drainage ditches.
we ran a 635f on a 9660 4-4.5 in normal conditions. if things got really fit you could easily get 5. with a 9770 should be able to run 4.5-5.5 no problem.
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