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Driftless SW Wisconsin | The JD. 7720 (later models were a class 5) was a much larger combine than the Gleaner F (Class 3). What I was referring to is going from a 7720 to a 9500 or 9600.
Yes, the IH rotaries were a paradigm shift which allowed the engine to be placed in the rear which is also where the rotor was driven and most engine power was consumed.
The JD 95/9600 moved the engine to the rear but the power intensive threshing cylinder was still up front as on the 77/8820, requiring a complex drive system and more structure.
The original comment above was aimed at simpler, lower cost equipment. Don't need to get into a history of combine design and evolution even though it's an interesting topic.
Edited by Jim 10/30/2025 23:12
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"...buy more land and bigger tractors..."
