Combines COBS in sample

Brad, I would start over on your settings and try to pinpoint where the cobs are coming from. Need to get the fan speed to at least 1000, could be variable speed pulleys are not free or need a new belt, could be as simple as moving the stop nut on on speed control, rotor back to 450, concave 3,shoe sieve minimum 5_8", start with chaffer at 1_2" and very slowly close until you start seeing grain loss. Open until no loss from chaffer. If sample is still unacceptable slow rotor in 20 rpm increments. Be careful here you do not want the rock trap and feeder chain force feeding a slow running rotor. Very hard on trap and chain and also a great source of cracked corn. A concave that is set too wide puts too much seperation to be done in back half of rotor, which leads to rotor loss, plus concave is much lower than grates and forces material rise to get into grate section. The key is moderation, do adjustments slowly. And sometimes it is a hybrid that simply we can not clean. Have a safe harvest

How many feeder chains are you runningIJ What is the model of your combine and which rotor doe it haveIJ

Just out of curiousity , are you combining 'white cob' varietiesIJ. We run an $50 gleaner and have similar problems but only with white cob varieties, the minute we switch to a red cob the problem disappears.We can put up with some cob in the sample but what really causes us probs is that the small piees of cob plug the sieve if we run too fast and corn pours out the back. In our area this isnt a problem unique to Gleaners, Case rotaries as well as NH rotaries are having the same problem, even conventional JD and Gleaner machines are having probs keeping cob out of the sample . Seems white cob varieties have a softer cob that breaks up easily compared to red cobs.

you must have a preference concerning feeder chains, could you share that

Sorry about that it's a 1990 1680, standard rotor, with disrupter bars on the rear. I closed the concave up to 5 today and turned the veins to the middle position instead of more straight up and that seemed to help. But I don't know how many feeder chains I'm running could that be a problemIJ thanks

Yeah I'm thinking that it might be the hybrid cause we've never had any problem like this before. But i'm gonna look at the stop nut on the speed control for the fan and see if I can adjust it any. Thanks for the info.

I found that the three strand feeder chain is tough on cobs. The slats are close together in the center and that is where most of the cobs are as they enter the feeder house. I counted as many as seven out of ten broken and split cobs before they entered the rotor. Also, there were damaged kernels still on the cobs while still in the feederhouse. I tried it with every other alternating slat removed and had better luck with less cob breakage. White cob corn was the worst. Your model came with a 2 strand chain, unless someone updated it. You may try it without the disrupters and compare both ways.

I used to fight cobs in the sample and by removing the disrupters it made a huge difference now I don't run them in corn .

sometime heavy or larger stuff will fall in to the clean grain cross auger in front of the seives because the

hot rod what length of the expanded metal are you using and if you are doing soybeans did it help clean up your sample anyIJ Thanks.