The JD 4020 is a good reliable 95 HP tractor that handles easily. Great power steering and brakes. Fast hydraulics and rugged transmission, if left at factory horsepower. Then add in the fact that they are fairly simple to work on and you have a good "work" farm tractor. I currently own 4 JD 4020s. Three are diesels and are worked every single day. Simple electric systems without any electronics make them well suited for the dirty life on a livestock farm.
The oldest is a 1966 model. I have four tachometers that add up to over 25K hours and it was twenty years old when I bought it. So it could easily have over 30K hours.
If you do not break a housing or something they are just about totally rebuildable. Since there where over 184,000 of them built you can find many after market parts sources. This helps keep the OEM parts prices down too.
The sad part of this is that they are getting too small for many of the common farm chores on today's livestock farm. We are switching over to JD 4440s on many applications. An example is the TMR wagons. The two main ones are over 500 cubic foot mixers and a JD 4020 will not handle them safely because of the weight. Another things is running grain augers. A 13 inch auger in wet corn will work a JD 4020 so we use a JD 4440.
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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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