I have an old 6620 that worked fine for my limited acres of Barley (100) However when I moved to my neighbours oats I am getting a lot of short 2-4 inch straws in the grain tank. The crop is overripe and down, The cylinder speed is 1000 and fan 550. Any tips?
With oats we always run at 1,000 rpm. Its incredibly tough to get all the seed rubbed off the stem, and out of the "pods". Plus, oat straw doesn't fall apart near as fast as wheat straw does...
Are you getting any oat chaff into the tank, too?
Sounds like your over threshing the crop. try slowing the cylinder and adjusting the concave clearance until the straw is not broken up. also it will make the grain separate easier in the walkers with the longer straw.