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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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