Ok so I am sort of new to adjusting an older combine like the 815, however I do understand the concept of it. It is a corn and soybean special. So correct me if im wrong but all i should have to do is adjust the chaffer and shoe sieves, the cylinder speed, the concave, and the fan speed? Now my issue is I dont think the concave indicator which needs to read 10 works. So how can I tell when it is where it needs to be without getting too complicated with it. My other question is the fan speed. The only indicator for fan speed is the dial from 1-9 for the settings. Yet it says it needs set on 1xxx rpms. How do i know the rpms of the fan when the only indicator is a number 1-9?