Your combine would have a closed-circuit hydrostatic pump for the propel system but the way a hydro drive works you cannot run multiple independent systems (like the propel and also an implement drive) off of the same pump. Self-propelled windrowers actually have at least three individual hydrostatic pump/motor systems - one for each wheel motor and at least one, if not two, for the header drive.
Regardless, if you're wanting to run a disc mower/conditioner with a hydrostat you'd want to have around 7 hydraulic horsepower per foot of cut to have satisfactory performance. (This is more of a minimum - actual SP windrowers can deliver closer to 12 hp/ft.) This would equate to around 50 gallons per minute at 4000 psi for a 16-ft header. In other words, running a rotary header takes big flow and big pressure which in turn requires a well-engineered system to function properly and keep cool. Years ago the Hesston windrower ran the rotary header with a big load-sensing open-circuit pump which would be another option for you but the statement above still holds true.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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