I never ran a 717... They're just a pukie little cut and throw harvester made for a 60 hp tractor. Your 4020 will probably make ratshit out of it. They also have an offset wagon hitch that pulls directly behind the cutterhead which can be rather dangerous on a steep hill. The 3970 should have an extended length, power tounge and the wagon hitch is inline with the tounge... so if you have to work on a grade you can steer the harvester to avoid a jacknife coming down hill...
If you're not bothing with corn just take every other row of knives out of the Deere and you'll run ti fine. It will work the Deere hard but she should sustain a full feedroll opening (slug) for a short time. The longer chop is better for the cows anyway. You only need the short chop for corn.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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