Yes , we have a big problem with rotor loss.We have round bar concaves.The rotor speed is between 350 rpm to 400 rpm.The corn moister is 14%.The head is a 6row 3 feet.The corn gives 7 tons a Hector ( 112bu per acre)
I think you could slow the rotor down a lot if its only 14% moisture. What number is the concave on? The other thing is, you are sure it is definitely rotor loss and not sieve loss? At that sort of yield and that moisture it should tear it off.....
I am n harvesting contractor from South Africa .We bout a new 9570 sts last year just before the corn season. The problem that we have is that it spills corn over the rotor on to the ground at the back of the harvester.We adjusted and played with the moving speed it just stade the same.This is a real problem for us as we are getting complaints from our customers.Do you guys have the same problem it so what did you do to correct it.
on you tine grates you can add a spacer on the left hand side(drivers ladder) it is about 1 inch to the bolts (8) that hold them to the frame. take all the filler plates out. there is 2 ways to set the rotor slow rpm with narrow concaves or fast rpm with wide concaves.when you have your machine set right the cob will be whole after running through the machine. to check this do a shut down test full load, before the cob runs through the chopper. we run 9770 with 12 row in 220-20 bushel corn @ 18 %- 24% at 3.5 mph . rotor speed at 450 rpm-500 rpm, concaves @ 24-28 air at 900- 1030,round bar, no filler plates and spacers on the tine grates.
how fast is your ground speed? maybe the machines not loaded? some conditions we've seen corn go out the back and when we pick up our ground speed and load the machine the loss will drop. not sayin this is for certain your problem but just a suggestion. in 112 bushel corn you shoud be able to run 6 or 7 mph with that machine if your header allows it. rotor speed sounds could probably be a little slower unless your having trouble separating
Thanks it helps a lot.the head that we have is a 649 JD head.The ground speed that we do is 6.5 mph. The tip that we got from JD south afrika was that we fit the rice concaves and remove every second wire from it. But we havent test it jet as we will only start haversting in june.yes it is defnetly rotor loss we did a power shat down to see.