Farm Equipment - R42 Corn rotor loss

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R42 Corn rotor loss

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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=203275
Printed Date: 26 Nov 2024 at 8:34pm
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Topic: R42 Corn rotor loss

Posted By: lbr
Subject: R42 Corn rotor loss
Date Posted: 19 Sep 2024 at 5:47am

Hello

I am having troubles with rotor loss running corn with my 1993 R42 with a 438 corn head. Corn is 18% around 210 bu per acre. Can anyone give me a good starting point for setting. I currently have rotor speed 250 and the concave set for 6. I am only seeing rotor loss. How would you recommend for setup and speed. Thanks for any assistance. This is my 2nd year with this combine and had some issues with rotor loss last year as well. I came from a F3.

Thanks again

Replies:

Posted By: DrAllis
Date Posted: 19 Sep 2024 at 6:04am

Concave at 12 for corn. Remove every other wire from rear half of the concave and remove every other wire from the separator grate on the left side.

Posted By: tbran
Date Posted: 19 Sep 2024 at 2:09pm

Ditto what Doc said - ALSO MEASURE THE LOSS - Drop the spreader and count the kernels per running foot under the discharge chute at harvest speed. If memory serves correct it takes 18 kernels per running foot under the 18" discharge chute to make 1 bu / a loss. IF you are in 150 bu corn and have 1 bu or less loss - you are an expert harvester. Most combine losses exceed 1% - by a lot.... if one tries to get to 0 loss,,, the cost to do that in extra fuel and time exceeds the loss cost. 1 BU / a loss is less than $4 today Grrrrrrrrr... Also harvest speed can affect loss. Too slow or too fast in different varieties makes a difference. We have seen some varieties that will have double the loss of a different variety at the same moisture/speed of harvest. Some varieties have shucks that 'roll' themselves into a giant stogie an roll up kernels inside - we use a cylinder bar or rasp concave bar bolted in the bottom to shred the shuck.

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: soggybottomboy
Date Posted: 19 Sep 2024 at 6:38pm

250 rpms sounds pretty slow to me. In 18 % corn I would think you could easily run 300 and get more centrifugal force in the separation process. But one change at a time tho.

Posted By: DrAllis
Date Posted: 19 Sep 2024 at 6:45pm

Yeah, I usually shoot for 300-320 in corn of any moisture, but always 12 on the concave.

Posted By: Unit3
Date Posted: 19 Sep 2024 at 9:24pm

How fast is your ground speed? You might not be running fast enough. Are you seeing loose corn in your standing rows? I have seen a 1 ft.² made out of PVC pipe. You’re supposed to be able to throw that on the ground and count the kernels inside of it. I really like that pan idea. If you could drag that along just behind the header, and somehow let it go and fill up with debris, that would really show you something.

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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C

Posted By: lbr
Date Posted: 20 Sep 2024 at 4:53am

I am running around 2.5-2.8 mph. The corn is 16.5 moisture and around 210 bu. I have tried slowing up and speeding up and don't see a lot of difference. The rotor has every 3rd wire removed on both ends. Thanks again for everyones help.

Posted By: cjarosz
Date Posted: 20 Sep 2024 at 6:06am

Had the same problem with my R50 couple years ago, mine has Trimpe hard surface bars but I didn’t have any reverse bars. Talked with dealer and then with trimpe and he said he would put two reverse bars closest to discharge and had some made up. I pulled rotor just enough to change them and that has taken care of almost all of my rotor loss

Posted By: lbr
Date Posted: 20 Sep 2024 at 6:55am

How is the best way to remove theextra wires from the rotor. Looke like I still need to do the every other wire because there are whole cobs stuck in the narrow holes. Again thanks

Posted By: SteveM C/IL
Date Posted: 21 Sep 2024 at 2:58pm

To remove wires on the separator grate I had to lower the "front" which might be called the rear. It was a t**d to get bolts out to do so. Took heating bushings with torch. Then you can grab wires with vise grips and hammer the out. Working from bin side.

Posted By: soggybottomboy
Date Posted: 22 Sep 2024 at 12:25am

I hesitate to disagree with the very knowledgable people here. That said, my son took every other wire out of our S67 and the result was that we over loaded the shoe. We have the most frustrating losses in soybeans. I think 90% of our losses are out of the rotor. Still not a big deal, but once you get them in the combine they should go in the hopper. We are running 4 reverse bars, and I just don't want to put in more because it makes the beans dirtier and it pulls harder.

Posted By: DrAllis
Date Posted: 22 Sep 2024 at 6:59am

Short 8-bar rotor R-40-42-50-52 in corn works the best in corn with every other wire removed in the rear half of the main concave and separator grate. Also needs four reverse bars as a rule. Two on the discharge end, one in the center 90 degrees off and one on the right 180 degrees from the one in the center. This is what works well. It isn't a 90 inch long 30 inch diameter rotor.