I recently purchased a used Case 85XT skidsteer. I have a homemade brushcutter that I built and use with my 743B. Yesterday, I hooked up my brushcutter to the 85XT (which by the way, is a bigger machine than my 743B and has about twice the hydraulic flow). The brushcutter spins up fine and seems to have plenty of power but when I try to move the machine forward or backward it seems to take hydraulic flow away from the cutter. It still has enough power to do both but every time you move forward or backward there is a slight surge as the cutter speeds up (when parked) and slows down a little (when moving). Is this normal? My 743B never did this. I there some powerbeyond port that I need to unplug somewhere? You guys have any ideas?