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Hi, I was looking for some help. We just took delivery on our new 2577 combine. Our local dealer did some adjustments before we took the combine and new draper. He changed the factory adjustment on the concave. There is a bolt at the front of the concave that can be adjusted to change the levelness of the concave from the front to the back. I don't know what the factory adjustment is, but it looks like the front is about 1/2 lower than the back. The back half would hit the concave stop bolt about 1/2 inch before the front. You can even see where the paint from the factory shows the original setting which looks like the factory sets it completely level from the front to the back. We have mostly run conventional machines, and the last few years we ran our first rotor which was the challenger 670 so I am not an expert on rotors by any means, but I would think that this unevenness from front to back would cause more headaches from the operators standpoint. How could I adjust the concave correctly when the front will always have more clearance than the back. What is everyone's opinion on this? What if the clearance is excessive in the front, and in corn the cobbs are toppling head over heal plugging the front concaves, but the back concaves are about right? I will try to post a picture of the adjustment I am talking about since I might not have been able to describe it good enough. Please post any comments on whether my dealer did a good thing or a bad thing.

Thank You,

Steve
 

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Don't pay alot of attention to the paint on the stop bolts as they may be painted before adjustments are made. During predelivery your dealer should have "leveled' the concaves. This is done by slowly pulling the concaves up until you hear them ticking on the rasp bars (separator engaged at idle), first the back then use the linkage in the front to get the front to tick also. It is possible that the concaves are level but the stop bolts were never ran back down to the correct position. I would make the dealer check it out.
 

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Over the years always leveled concaves front to back. The first and third should both rub the rasp bars. I've put the rotor in neutral and used a bar and turned the rotor over. Turn the stop bolts up and draw the concaves up til they rub, use turnbuckle to adjust.
 
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