I can't find a parts blowout on the steering box, so this is from (an often feeble) memory. Remove the steering wheel. Remove the front cover of the steering box at the front of the tractor. Remove the nut, washer and bearing. With that done, the shaft should unscrew out the front of the gearbox. I'm about 80% sure of that procedure. I'll try to confirm in the next few days.