Combine just drives the reel, up down, and fore aft. The reservoir on the header drives the knife and canvas independent from the combine. At least on my sp36 which I believe is basically the same as 94c. I use hydraul 56 as well.Doesn't the hydraulic system on the 94C's adapter require a line plumbed to the combine main hydraulic reservoir? I've never been clear on exactly why, but would think you'd want to run the same oil in the header adapter as your combine uses.