I was advised to do the opposite with regard to filler plates, remove them for wheat-eating capacity. I've bounced around the advice on filler plates a great deal. The one thing I've settled on them making sense for is high moisture corn. You'll get advice from both sides on this one to be sure.
For what it's worth, I did remove mine for wheat last year. However, I had never run it in wheat before. . .so no real comparison. I bought my bine from a dairy farmer, he did high moisture corn, kinda adds up. (Mine is a 4420)
Don't pull any wires out! Just take out the filler plates between each bar and remove any concave fillers on the back side of the concave if they crawled inside and put them in. Not sure if they would have put them in or not? If you leave the plates in that fill in between bars it will vibrate your combine to death when harvesting wheat!
no actually i had an F2! and combiness we had three different dealers out to set our machine and none of them could set it better than we could! they couldn't tell us a reason why it was cracking(GRINDING) so much grain. and it wasn't worn out my grandpa bought it new, it had done this from the get go!