No worry on angering anyone, just trying to help you avoid at least some of the wrong answers you have gotten and will get when people misunderstand what machine you are talking about.
The engine serial number tag was on the engine between the fuel transfer pump and end of the starter. There is no direct relationship generally available to the public between the engine and tractor serial numbers, and the engine could have been swapped over the years
You have rivets where the serial number tag for the tractor used to be.
I do not see a serial number that is for a JD 400 on that document. The number there might be a dealer inventory number.
The loader looks like, and should be, a JD Model 7400 for a 400 tractor.
This post was edited by Jim.ME on 08/23/2022 at 12:26 pm.
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