I know I need to move the PTO selection to 540 when using the brush hog, and 2100 when using the MMM. But what is the 540/2100 position for? Seems like it would be for powering the MMM and brush hog at the same time. But is that really a thing? Can't see why you'd have a brush hog running if you've already mowed it with the MMM.
I gotta' be missing something. And I did look in the manual.