I can only get about 2.5 mph out of our 6620
in 180 bushel corn before I start geting alot
of whole corn coming over the tailings. I
have the top wide tooth chaffer open about
3/8 to 1/2 inch and the bottom sieve all the
way open. I am also running the fan as fast
as it will go. I think we need a larger combine
or would a Loewen air sieve help with capacity??