Combines Cover Plates Gorden Bars 1660

Rotor approx. 300 and concave around n5 if I remember correctly also I zeroed_leveled concave and reset the indicator on side shield. I kinda thought the rotor ran a little to empty creating the cracks.Also I never did get any rotor losses due to the slow corn head speed but I figured every other wire pulled would go along way in preventing this when I get up to 4 mph or so.Again I thought cover plates with an even wider opening and slower rotor speed combined with more material through put (higher field speed)and less wires would give me a good gentle thresh and more capacity combined with wide open sieve and corresponding chaffer settings.

Moisture 22% to 25% and it seems to me that if you see some cracked corn there is probably alot more that has blown over the shoe.As far as sample in the tank and grain on the ground behind the separator is concerned you'll find 3 maybe 4 whole kernals and a few fines in 1 sq.ft. also fines and some kernals on the rear axle my question is focused at the concave clearance through put equation (how much rotor speed,rotor clearance and how hard can you run it in.)Do you think the combine was running to empty and can this cause crackingIJ I live in Ontario Canada.

1990 1660 with a 963 corn head.

Mike, why does everybody want to mess with a perfectly good machineIJ I have ran thes things for 25 years and all it takes is to know how to set them.

Please explain how I get rotor loss if the rotor is running half full.Isn't the operator forced to slow down when to much material is going over the rotorIJ One of my main concerns was that I was creating to many fines with the rotor running half full but I'm still able to get a good sample in the tank and leave less than 1_2 bushel on the ground in whole kernals but how much is going out as fines (I think this is reasonable loss behind the shoe)IJ How much loss do you see in a sq.ft. behind the separatorIJ Also isn't rotor speed and ground speed a direct relationship ie. higher ground speed = more mat'l flow which requires more rotor speed to a pointIJ Kind of the math required to get to that 50 to 60 rpm rotor dropIJ I expect things will be a little more challenging for me this year as it looks like corn crop is decent looking and with my corn head running up to speed since I now have the proper drive sprocket.

Rick this IS a perfectly good machine but I'm only starting my 3rd. year in mine so needless to say you have a lot more experience in one than I do.I guess its one of those things where people like yourself who have been there and done that wonder why people like me have to ask seemingly redundant questions and make our own mistakes. I guess its the best way to learn but I appreciate people like yourself with experience trying to save people like me money and time with experience.