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Interesting comments here about hp and capacity.

I had a 7720 in the shop the other day and just for the fun of it meassured the width of its feeder house. To no surprise it was exactly the same width as our modern day STS's have.

What makes some think that this particular 7700 needs more than 200hp to push a 6 row corn head? The old 9600 high power version had 265hp and pushed a 12 row corn head right to the limit of its clean grain elevator.

The STS only needs so much hp, because it is expected to cram 3 or 4 times the material through a 7700 size feeder house and than through a power hungry rotor. The cleaning shoe on an STS is hardly any wider. We have to remember that the STS is a narrow body combine like the 9500 and 7700 have been.
 

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All 6,7 and 8 STS's have the same feeder house opening. We have switched feeder houses from one to the other in our shop.
I don't know about the 9560 STS, because I have never seen one in our area.
Only the wide body JD walker machines have a wider feeder house opening.

I think the widest feeder house opening is on the new AGCO rotary combines.
The Gleaner natural flow combines have the narowest feeder house.
 
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