We also had to adjust viens in our 7088's, also had to put large wire rear concave in wheat and durum (never did this with 2588) 399 engine hours on both 7088's, were excellent and very impressed with capacity.
I was having rotor loss in wheat, it seemed with the more HP of the 7088's I was pushing too much product through too quickly, and standing the viens up slowed it down enough and allowed more revolutions to separate. I also was running the concaves as tight as they would go, with the rotor at 1050 RPM. The large wire concaves helped more than adjusting the viens, but both reduced the rotor loss.
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