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East of Broken Bow | Had a 1440 for many years, assume 1460 is similar.
rotor speed seems to affect grinding more than concave opening. Slow rotor down, and open concave. You want to see the vast majority of your cobs either whole or only broken in half. If they are getting broken up, first loosen concave, then slow rotor. If you are grinding too much, first slow rotor, then open concave. Running the rotor faster gives you a bit more capacity, so what I usually did was run the concave to see whole cobs out the back, then mess with rotor speed to get full shelling. If you aren't breaking the cobs into small pieces, they won't go into the bin.
As to the bottom sieve, we were continuous corn for the last several years we had the combine, and the lower sieve was all the way open, and stayed there for corn. On the 1400 series, shutting down the lower sieve cuts the air to the upper sieve, putting more trash to the lower sieve, which adds trash in the sample and adds to tailings which makes you want to shut the lower sieve even more which cuts the air even more. Open it all the way, and let the upper sieve do the work, use the front part to clean the sample, open the rear part more to capture any grain in the tailings.
Lastly, if you seem to have too much grinding of the corn, and can't get it to quit, check some ears on the stalk. Most of the time when it seemed we had excess grinding, ear worms had been chewing on the kernels on the ear, which caused the fines in the sample more than the combine did. The fan should be pretty much full speed on an early 1460, close to full speed on a later one. Somewhere along the way, they changed the fan to move a little bit more air, which was often the limiting factor on a 1460 in corn. | |
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