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 - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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