Axial-Flow 9250 rotor loss while harvesting corn

[ArvinField78]

Hey all, here's my first post after lurking for a bit. I ran into an issue harvesting corn. We’re in a great-looking field that averaged 240+ but my monitor is showing a constant, unacceptable amount of rotor loss. I’m running a Case IH Axial-Flow 9250 with a 12-row 4412 chopping head. The corn is a little wetter than I’d like, about 22-23%, and the stalks are getting brittle. I've already opened the concaves to the 5 position, brought the rotor down to 350 RPM, and bumped the fan speed up slightly to 1100, trying to save the kernels and keep the shoe clean, but the loss is still sitting stubbornly at over 1.5 bu/acre. I don't see any obvious rotor or concave damage, and the grain sample in the tank looks beautiful, but the ground tells a different story. I'm worried about slug feeding but I'm only doing 3.5 MPH. Any suggestions on where to check next? Should I put a concave filler plate back in to try and even out the flow? Hoping to get my machine dialed in since I've got a few more hundred acres left. Thanks!

 

[zackhigh]

Put a filler plate back in to help keep the crop mat more even and reduce kernels riding out the back. Also check your rotor cage vanes; if they’re set too fast, grain might be exiting before it’s threshed

 

[Alan]

Also check the transition cone for wear. If it's getting thin or rough, it can mess with how the crop flows and cause separation to happen too soon, especially when the corn is wet.