I have one of those in the W version.
A couple of things I would do before getting deep is to no 1 check for fluid in the res.
If you are kicking the tires and the wheel is turning but the steering wheel is not then you have big problems besides the power end of it. That would have to be isolated and fixed.
I guess first off would be to take the clothes off that tractor and do a couple of things like above.
Blocking up the front end a bit off the floor will take the weight off the system and help with diagnosis.
Get into it a little farther and post back, maybe.