300U Manual Steering Right Side Sloppy

300U Manual Steering with stock short arms.

I have developed a lot of slop in the right side pitman arm (gear shaft). The right side steering wobbles when traveling and the left side does not.

Gearbox does not leak.
There is no up and down play in steering shaft and no slop or play in the left pitman arm (lever shaft)

With front wheels off the ground and holding the steering wheel stationery I can not move the left pitman (no slop) but I can move the bottom end of the right pitman more that an inch (lots of slop).

I believe the eccentric adjustment (#21 a & b IT) adjusts the right side gearbox case to mesh the lever shaft and gear shaft closer but I have to change dowels in order to make that correction last.

The other two adjusting screws (#9 IT) are to adjust any side to side slop in the lever and gear shafts. There is about a ¼ inch sideway play in the gear shaft. Is that enough to let it jump teeth.

If I have a misunderstanding of the adjustment screws please advice.

It’s just to cold in my old barn to tackle a rebuild project now, so I’m open to any suggestions that will make it last till the weather warms.

Thanks,
Dell

From my experience there are straight spurr gears in the box that are directly meshed with the shaft from the opposite side. Even if it had play in and out, the gear teeth mesh would not be adjustable. A broken tooth would make a radical difference in play (pretty common) and wear would also be a factor. See if it has the same play when near the right or left full lock travel. (not at full lock) if it doesn't, there is an issue of wear or tooth damage in the center of the partial gear on tha loose shaft. If the play is along the whole length of the travel, the key might be loose at the arm taper.
Be sure to look closely at the shaft to arm joint for movement. The parts diagram on caseih.com does a pretty good job of illustrating the components. Jim