I am not sure, but check the PTO speed of the X585. Running in the back of my mind that they are not 540 RPM, but maybe 1000 RPM. Not for sure on that.
I use a pull type, ground driven spreader, and get by just fine. Can't spread salt in the winter with the pull-type however. /forums/images/graemlins/frown.gif If anyone is thinking pull-type, be sure to get one with wide stance on the wheels, as mine is a bit tippy when on a side slope, and I wish I had wider spaced wheels.