John Deere 9400 - engine change at what serial #

andy r

Member
I wondered if anyone knew when John Deere switched to the slightly larger more reliable engine in the 9400 combine? I seem to think it was in 1990 or 1991, but really wanted to link the change to the combine serial number. I have the combine serial number, but I do not have the engine serial number (I know you can identify the engine from its serial number). Combine in question is HO9400X635982.
 

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