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S-Series Combine rotor type recommendations
Cross Implement Inc

In model year 2012, John Deere S-Series Combines feature two rotor options; the TriStream™ rotor and the Variable Stream rotor

TriStream rotor

TriStream rotor

The TriStream rotor was previously called the Bullet Rotor™. It is in base equipment for all corn and small grain S-Series Combines. The rotor features a slightly tapered front nose (bullet profile) that allows material to flow very smoothly and with less resistance through the rotor housing as compared to competitive rotor designs.
The TriStream rotor is the rotor of choice in corn, soybeans, and typical small grains (wheat, barley, milo, canola, edible beans, etc.) when optimum threshing is required.
Variable Stream rotor

Variable Stream rotor

This rotor is in base equipment for all S-Series rice combines and is available as optional equipment in small grain combines. It features a very long, streamlined, front nose (compared to the TriStream rotor as well as competitive rotors).
This rotor’s long taper design is best suited for tough material handling (high-yielding, damp, wet, or extremely green crop conditions) where smoother material flow is crucial to achieving optimum performance. The Variable Stream rotor is the rotor of choice for rice producers as well as for producers in western Canada that grow small grain crop varieties that have very tough straw characteristics.
The Variable Stream rotor has the ability to be very versatile and can be adjusted and/or adapted to deliver very good performance in all companion crops (such as corn, soybeans, canola, etc.) the producer may harvest along with their primary crop.
The chart below shows the rotor type recommended for specific crop areas in the United States and Canada:

Base combine Corn and wheat belt areas of US and
eastern Canada
California and delta rice and western
Canada small grain
Corn machine TriStream -
Small grain machine TriStream Variable Stream
Rice machine - Variable Stream

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