Figure out WHERE the play is for starters. Often it is the wear in the front axle kingpin that allow the axle to move back and forth with steering pressure. If the pinion and sector is worn, you can decrease the clearance between the gears by removing the sector and moving shims from the top to the bottom. If the pinion gear itself is worn it can usually be improved by removing it and flipping it over and rewelding it as it generally wears at one end of the teeth only. If the drag link ends are worn, they a simple R&R. For the steering gear adjustment it would help to get the tractor off the ground some unless you have arms less than a foot long.