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| Sounds likely that there isn't enough separation occurring up front. The 480 has what are called the spiral rotors (they have the serrated flighting on them). Overspeeding them can result in higher rotor loss. All of the 500 series combines and the 470Rs use a spike or paddle configuration on the rotors which are much improved in this respect. But, you still have a great deal of capacity inside the machine which just needs to be properly utilized. Try these settings (or in this vicinity):
Cylinder speed: 650-700 (make sure that the cylinder gearbox is in the high speed range (sounds like you are still running in low at present). Also, make sure you have the filler panels between the rasp bars instead of just an open cylinder.
Concave: 13 (approx. Also make sure to pull both inspection panels and verify that concave is absolutely level. If your concave isn't level, nothing else you change is going to help much. This is a must that you verify before each season and has been on all combines, but 400 Lexions can occasionally get out of adjustment if you aren't watching this year to year. Make sure your APS caps are in good condition also.
Disawning plates: Open ideally. If you have a set of the keystock type grates for installation here, use them and keep the disawning plates open for more separation capacity.
Rotor speed and rotor grates: Newer machines have full speed variability instead of 3 ranges, but either the low or mid speed range in beans should yield the best results. Also check the grates themselves under the rotors and make sure there are no solid grates in it. These are for some small grains, but for beans and other crops you want to see full length of open, perforated grates from front of rotors to rear. There is also a specific grate, one optimum for small grains and the other optimum for corn/beans. You should verify you have the correct one, your operators manual would likely have a picture of this for reference.
A 9760 is a pretty solid soybean combine, but it is perfectly reasonable that a 480 should be able to match it and even best it by a bit in tough green stem crop.
Edited by 9700 8/19/2010 07:57
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high rotor loss with lexion 480 in green stem beans
