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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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