I always mow at WOT. But that is only because the "suction" on the deck works best at WOT or max blade tip speed. Running WOT is not necessary for any other reason. The hydro cools fine no matter the throttle range, (if you have a hydro tractor, a gear drive machine doesn't care what speed the engine runs) and so does the motor. Obviously, I am one of the few who will say this. But there is no need to run other attachments at a speed that is not needed. Just like on a big tractor, run it the speed that is needed. Since you have a gear drive machine, don't be afraid to pull the throttle back if you need to. I have put thousands of hours on cubs (and other air cooled motors) and I work on equipment for a living. I have never seen any adverse affect to running an air cooled engine at a lower throttle setting. Same goes for a hydro. Besides, neither Kohler, Cub Cadet, or Sunstrand, have anything in writing that say that it is necessary to run any of the units at max RPM unless it is required.
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