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| There were two major variations of 4020 with the break at sn 203,000 beginning of the 1969 model year. There are enough differences that the two versions have separate shop manuals and parts catalogs. The hydraulics are considerably different along with the hydraulic controls were moved from the left side of the dash to the right side of the seat. The engines are somewhat different too, internal parts will interchange, but late engine parts in an early diesel work poorly because the two blocks have a different deck height and the late engine parts give low compression making for hard starting.
The later the 4020, the higher the asking price these days. Getting up to considerably over what they cost new. The last serial number was 270,288.
I only know the details of the early version and it had three variations, in electrical harness, air cleaner and other details. I have a 1968 gas and its been working fine for me.
The late ones are called "side console" from the hydraulic levers encased in a module to the right of the seat. The earlier ones are called "pre side console."
The side console tractor could have a maximum of three remotes, and the pre side console could have just two, many have only one. Adding is expensive using JD parts. There is a handy place to tap pressure and return to use any closed center valve on the early hydraulics and there is a handy power beyond block available for adding more valves to the later side console tractors though the connections for the early hydraulic expansion will work with the later tractors too.
Gerald J. | |
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4020 John Deere info wanted
