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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