What other 3pt pto driven implements do you run that you feel engage "hard" with your 2210, 23hp hydro, with 17.7 pto hp @ 3000 eng.rpm, 540 @ rear pto? Now a 5' rotory cutter is big for tractor but you should be able to sit on your lawn and spin it with your machine. It may show its lack of power as you cut. bogging down the engine. I have a 30hp, 25.5 hp @ rear pto and I run a 5' KK rotary quite well. My cutters owners manuel states: with tractor at idle speed, engage the PTO and slowly advace throttle to 540 PTO RPM. and it works well. I did engage at 540 RPM a few times on accident, after stopping for a break and that rotary cutter bounced around trying to rip my 3pt hitch off my tractor. A rotory cutter has 2 very heavy hinged blades that need the spinning cintrifical force to find balance. On mine and all that I have seen operated you engage at a low RPM and the cutter will wobble some then smooth out as the blade find balance then speed up to 540 PTO RPM. I engage none of my implements at full 540. I engage at lower RPMs then bring them up to speed. Now I think I would look at that cutter off the tractor and make sure everything turns freely, good luck