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Abe: Your problem haunts all of the manual steering JD's at one time or another. I went to the search feature above, and there's probably 30 old messages that deal with shimmy, wobble, hard steering, excessive play, etc. I'm no epxert, but I've adjusted a few. There's a vertical adjustment of the main pedestal shaft, an end play adjustment using shims in the front cap, and the eccentric that leans the sector gear into the worm. The problem is that the sector and worm wear most when the wheels are straight, so you need to adjust out the play at either the left or right extreme, or you'll never be able to turn it. Here's a couple of excerpts from old messages I found. The search feature has been a real help to me ! Frank-in-Tallahassee ...If you will turn your wheels about 30 percent to the right, the sector gear will allow you to reach the lock screw better. Also, do not adjust the eccentric bushing to bring the gears tighter if your wheels are pointed straight ahead. There is some wear in the gears, mostly in the straight ahead position, and if you make the adjustment straight ahead, the steering may bind up when you turn the wheel right or left.... ...to turn that eccentric bushing, the set screw in the bottom must be completely removed of course, then I use a pry bar to rotate the eccentric bushing until the half moon sector gear is closer to the worm. I jack up the front of the tractor frame which takes part of the load off that steering shaft so the eccentric bushing will turn. You can also adjust your steering shaft end play by removing the end cap and removing some of the shim/gaskets....
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