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Discussion Starter · #1 ·
I pulled cylinder this winter and put steep pitch helical on thresher side, replaced all reverse bar's with forward, extended helical into discharge area in a staggered fashion, and installed a rasp bar in floor of separator.

Worked fantastic in wheat. Not so good in corn. I am losing 2 to 3 bushel out of the rotor. tomorrow I am going to put some reverse bars back in. Is there anything else I should try?

250 to 400 RPM doesn't make a difference, 5 to 7 MPH no difference. 17 moisture corn avg 150 bu.
 

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We tried that as well and it is a disaster in corn. They say it works in wheat and it did good in beans, but corn was a mess. We always felt 4 reverse bars was what you need. The higher the moisture the more problem you will have. If you have the narrow wire concaves that were in the older ones I would suggest pulling out every other wire in at least part of the thresher. We always had problems in 20+% corn with rotor loss, but at 17% you should be able to minimize that. We did the rasp bar mod as many have suggested but I honestly can't tell you it did much for us.
 

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Where did you install the reverse bars?? Two near the discharge end and two more (90 degrees to the first two) towards the gearbox from the discharge?? (in other words all reversers in the sep section?)
 

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We did 29% corn last year with no problem (what a year). No reverse bars with steep pitch on thresher side Remove the helicals over the small seperator section above grate. That is also where we put the f2 bar. We have removed every other rasp bar (staggered pattern) in the seperator section to slow the flow down. We have had less rotor loss this way then we had with our 21 series. As mentioned if you don't want to do these mods the reverse bars will suffice but require more power and I believe the mods* provide the best sample we could ever get in corn. Are you carrying a lot of stalk and leaves thru the machine?
 

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I have also heard that they are using a shim kit under the bars in the separator section to reduce rotor loss. Have not tried it myself, but the theory is that it helps push grain through the cage. I'm assuming you have a CDF rotor. Maybe someone else can confirm or deny that it actually works.
 

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http://combineforums.proboards.com/index....ay&thread=20951

This is a couple of ideas from a few very knowledgeable people. I put the shims under the thresher side to grow that part of the rotor to 25. Also I took out the reverse bars over the thrasher but left them in the seperator side. Our machine has the steep pitch helicals in it all ready. We are still out a while on corn but I am hoping this setup works, and am willing to make changes as they become necessary.
 

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When you guys say you have the steep pitch helicals, do you mean across the entire cage or just over the thresher section? Personally, I just have the steep pitch helicals over the thresher/concave section, but do know a couple machines locally that have had a complete set of the steep slopes and I believe they did have a little trouble with rotor loss in corn.
 

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Mine is over the thresher only as all I am trying to stop is the second pass over the concave. Then I want to give it a chance to separate the rest out. If you don't eliminate the second pass you get less separation at the concave and that is where you want the majority to go out. With this setup I found less fines as well as less hp etc.
 

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Discussion Starter · #11 ·
Two of the long rev bars at the end and two more next to them in the separator side helped a bunch. I am taking in stalks and leaves today and using up power.

I like the idea of removing bars in a stager, that seems like it will work without the power robing rev bars.

I do have the CDF rotor.

Thaks for all the help.
 

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Pull the knives off rotor. I don't know how you did wheat with them. I sh** wheat out the rotor all day with them in. We had the dealer here for a day and a half and couldn't make it any better. Next day I pulled knives and waalaa, greatly reduced rotor loss. If you finially figure it out in HMC let me know as I always throw more out than I like.
 

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Discussion Starter · #13 ·
I will pull them out tomorrow.

If I slowed the rotor down to 200 rpm it was doing a great job but it increased power consumption tremendously.
I had never thought of taking the knives out.

We were in easy shelling soft wheat and had no problem with loss.
 

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Yes I had forgotten to mention knives off as well and you may or may not have to put them back in for green viney crops. The full mod means staggering every other bar off on seperator side (on each row) and continuing every other row to end of rotor (removing discharge paddle) . We always work in what some people call wet corn (above 22%) and have no problems with this setup in high yielding corn.
 
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