I have the little brother in the 6620 and I have no problem getting common wear parts from JD for it. The 6620 and 7720 share many parts such as belts and bearings. Most commonly needed wear parts are on the shelf at the various JD dealers around here. Now if you want to talk about things such as a new cylinder head for the engine then those parts are NLA just like they would be for any combine made during the late 1970's and early 1980's. Just like any older machine you can reach a point where major repairs are needed and the cost can easily exceed the value of the machine when in good condition.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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