Combines cdf rotor lossIJIJIJ

Have CDF set same with 6 row and 80-90bu. avg corn. Concave at .5in and rotor at 450rpm. CDF tends to need more rpm than standard in my opinion.

I'm sure I'll be shunned forever by saying this on this board, but why is it not stockIJ One of the real advantages of the CDF rotor's smaller diameter is that it doesn't require as much power to process material, therefore the age-old rule of "chuck your reverse bars!!" shouldn't universally apply, especially in corn. Put them back in. What are you running for ground speedIJ I'd like to see 4 reverse bars per stock configuration and adjust separator grate closer without the bottom bar bolted to it so you can get closer to the rotor. How are your cobsIJ Coming out nearly whole to wholeIJ Higher rotor speeds, without reverse bars installed, can be hurting you. Separation takes time, and it is possible to 'auger' material through too quickly.

ground speed is as fast as i want it to be. absolutely no power loss. cobs are pretty much whole(80%). we just have to many cobs with grain left on them when running low cyl. rpm. we think that they are not getting threshed all the way at concave, then making it thru to the chopper and grain gets beat out by blades then to ground. grain loss mon. never reads loss to rotor.(unless sensor is bad on discharge end).we only know of rotor loss because we see grain on ground. we have tried stock setup and get same results-rotor loss. will taking the 4 short helicals off of the back access door helpIJIJIJIJ

j72, I have worked with different rotors and never saw a problem with threshing corn off the cob. I have not seen it though in drought corn so that may be part of the problem but with the conventional combines this was sometimes a real big problem. I would suggest you may be running the rotor too slow and_or to far open. Check the loss monitors as I have had new ones that were bad. Too slow a rotor speed can cause rotor loss even if it was shelled at the concave. Taking the helicals off is a plus for sure. Good luck

You should be able to get all the corn threshed off at the concave, but you may have to, especially true in drought corn, move the front of the concave up to the min position. The hump kit on the door also seemed to help get the cob rolling into the concave better than a flat rock door. I'd also try taking the stationary bar off the sep. grate and using the full adjustment of that grate to act as a secondary concave. Whether you play with the helicals or reverse bars, you're doing essentially the same thing - controlling rate of crop flow through the rotor. CaseIH has adjustable vanes_helicals - Gleaner uses reverse bars.

You can't get the proper concave wedge with this cylinder.Use a hump kit on the standard door to help align the cobs.The sump_stone trap system seems to promote cob breakage.With the cdf rotor we make 3_8"spacer bars and put under cylinder bars at the concave end of rotor.Use longer grade 8 hardware and torque to 110 ftlbs.You can now set the concave like we did with the old large diameter rotor with a wedge that will roll the cobs to help prvent breakage.We use a snap-on torque adapter used to torque cylinder head bolts under rocker shaft of ac 301 cid engines.

kernal, Never had the sump with Gleaner but I know it does not work as well with other makes. I use the hump as well as the wedge and steep pitch helical over thresher and believe that also helps with rotor loss and less trash over sieves. It definitely improves grain quality in some crops!

I would like as much and more detail on this mod as you can give me . Thanks in advanced

The spacer bars are 21_4 wide x 18 long x 3_8 thick with holes drilled to cylinder bar bolt pattern.Then you bolt under cylinder bar with the longer bolts.This increases diameter of cyliner bar circle and allows set up the concave as before.This is only done over the concave.