There were two models called the 4100.

The first one was the regular ag chassis version of the 1965-1975 4000 series (model number stamped into the transmission started with either 410 or D10 depending on the year). Most folks just called them the 4000 as opposed to the 4200 which was the row crop chassis model in that series.

The second one was made from 1975-1981, and it was part of the later 4600 series, not the 4000 series. It was basically a 4600SU with a slightly smaller 192 ci engine. It used the lighter radius rod front axle and steering of the 3xxx series and the heavier duty rear axle of the 4xxx series just like the 4000SU and 4600SU, just with a slightly smaller engine. The model number stamped into the flat spot for a 4100 would start with KA1 or KA2 depending on the exact year it was made.

And yes, tractordata is pretty much spot on with its information for the 4100 made from 75-81.
 
Thanks for the reply. So the 4100 is less horsepower than a 4600 SU? I was under the impression that all 3 cylinder 4000/4600/4610 diesel tractors were equipped with the 201 engine. Learn something new every day.
 
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