Combines ATTN tbran New CDF Rotor

For better threshing in WHEAT and other harder to thresh crops there was a bulletin about inserting one reverse bar in the RH position n4 (RH end one) one in n3 and two on discharge or paddle end. We seem to have settled on two reverse bars, position n2 ( 2nd from lH end) and leaving out two bars in position n 2 with 2 short bar pieces bolted in where the threshing grate ends ( in first bolt hole RH side pos 3) to prevent wear on the backup bar at the transition area. We also leave two long bars out in the discharge end position 1 and install a short forward (by short I mean 5" bar made by chopping off a bar on either end equidistant from the mounting threaded hole.) bar next to the discharge paddle where the long bars are left out. In other words we leave out 4 bars 2 in pos n1 and 2 in pos 2 and install two reverse bars in pos n2 in lieu of all forward. leaving out the bars slows down the material but does not tangle it. Keep in mind we have no hard to thresh crops like hard winter wheat etc. We also installed steep pitch helicals on the thresher side transitioned into the regular bars and shimmed the steep pitch out .125 or 1_8". Works great, less filling...

I have a new R75 that I plan to modify before using it. I only do corn. It came with 2 reverse bars in way left and way right locations. I plan to remove both reverse bars way right (over the concave) and install forward ones there, and plan to move one of the left ones to position 2 - one row to the right. Anyone have a better ideaIJIJ TIA

The one reverse bar you are moving to n2 are you putting it on the opposite side as the far left oneIJ

Yes. Why do you not try it the way it is. I am not sure you need to be modifying these rotors. They work great from the factory.

the reverse bars are for high moisture corn, and wheat, we do very little of this thus we run forward bars in the threshing area. I guess the beauty here is try it and see for yourself. Takes very little to change in the scheme of things if you think you can do better..

calvin, A couple of things cause me to not want any reverse bars on the concave. I think it may damage more kernels with the left right whap on the cobs_corn. Also, Gleaner I think assumes that you are using their Hugger heads, and on the 8 row 30" Hugger the cross auger flightings meet or centers left of the center of the feeder house so that they can use the head on the 52 series gleaners. Maybe they want reverse bars on location 4 so that they can try to better utilize the right half of the thresher sideIJIJ However, I use the Maise Special (read - non chopping 2 roll header) Geringhoff that we set up to feed the combine way more to the right side of the throat so we can use more of the rotor - way to the right end. We have had extremely low kernel damage results with this same head on our old R72(running about 240 rpm rotor),and see no need to experiment with Gleaner's engineers ideas on this, especially when we feed the throat this (I think better) way.

Yes, I will just swap 2 bars that are side by side.

Your talking about a whole different ball game with the smaller diameter rotor. You will have to run your rotor faster but the quality will be better. You will see better quality out of a CDF in corn even with the reverse bars in. I have tried taking out the reverse bars over the concave and my loss seemed to go up (20% corn). Horsepower or cob breakup has not been an issue with the CDF unless you were taking a whole bunch of trash in.

Faster rasp bar speed _ less grain damageIJ That would be a new concept in thrashing in my book. I may leave it alone for the first year. I usually blank off the first 2 or 3 concave openings - not sure on whether to do this on the CDFIJIJ

You get less grain damage from bigger clearances in cage area. less rotor tip speed from smaller rotor (This may be marginal). Fewer cylder bars hitting crop. They all add up to less damage in corn and beans.