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| Cotton, are you positive that your loss is coming from the rotor, for that matter even the combine itself? Why I ask is that I have found that as the moisture of the corn goes down the amount of loss at the head increases. At 15% moisture we have a heck of a time with head shellage. At that moisture kernals will shell just from the ears hitting against each other besides from coming into contact with moving metal parts such as the gathering chains & cross auger. We have tried everything imanginable including closing the stripper plates to as close as possible, slowing the head speed down as well as changing ground speed without seeing much difference. Currently we are running a 2388 with a 1083 cornhead but have experiences it with virtually every combine we have owned, from 3 other AFs, a JD, a n MF, and the old cylinder IHs. Trying shutting the machine down in the field & checking under the head & combine as well as behind the combine if you haven't already. One place that we look to check for rotor loss is in the standing crop next to where we are stopped. usually if the corn is coming out the rotor the spreaders will throw it into the standing corn oreso than if the loss is coming over the back with the tailings.
As for the GLM, it's more for indicating changes in grain loss than showing actual grain loss once you get the sensitivity set where it should be. If your GLM is like the ones our machines have had the lights will blink at times even when there is no crop in the machine. Also, as you begin to increase the amount of broken cobs by overthreshing those pieces will give false hits on the sensor pads making it appear that grain loss is increasing.
Instead of increasing your rotor speed & narrowing the concaves have you tried slow the rotor speed down & opening the concaves allowing more corn on corn contact instead of corn on metal? You might give it a try, it has worked for us.
Good luck on getting your problem solved
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acceptable grain loss in corn?
