Assuming you have rack and pinion axles. This can be very difficult if the wheels have not been moved for many years, but this is the procedure. Jack up the tractor and turn the axle until the "teeth" in axle are turned up. loosen the three large bolts(1 5/16" socket) about 6 or 8 turns, About an inch. Tighten the 2 smaller bolts(1 1/16" socket) to push in the wedge to loosen. After the wedge is loose, then turn the pinion shaft(the other 1 1/16 bolt) to roll the wheel in or out. The problem is that all the bolts and wedges tend to get very tight after not getting moved for 40 or 50 years.