It's a little-known 'factory racing' model... they're designed to go fast, and only turn left...
Okay, so really...
Mechanical steering systems wear, and MOST of the wear occurs in the gearing where the wheels are centered straight ahead. Why? Because most of the operating time is spent there, and most of the steering corrections are within a quarter-turn of center.
When you get all that gooey muck cleaned out, you will PROBABLY find that the worm and sector are sloppy... but turn it to full left, or full right lock, the worm and sector fit much tighter. There is no 'easy' fix for this, because the sector teeth and worm thread have worn away right there.
With MOST steering systems, you can make a certain amount of adjustment somewhere, but realize that if you tighten up adjustments to take slop out in the worn areas, you'll wind up binding at the unworn areas.
I haven't done this on anything Allis, but I HAVE done it on other steering systems. I will not advise you to do it, nor guarantee any results, or provide any warrantee... but I have done this:
Set the gears to be fairly snug at the center, and slightly bindy at the limits.
take a toothbrush and toothpaste, and totally coat the worm and sector. Don't use the fru-fru 'gentle' toothpaste, use the most aggressive, abrasive stuff you can find, and get it packed in there good.
Then run it lock-to-lock 'till your arms, and your kids', and your neighbors' arms all fall off.
Then tighten them in a bit more, and do it again.
Eventually, the worm and sector will be abraded down to the point where worm-sector clearance is basically same all the way around the arc.
Clean it out really good, put it back together with proper lubricant and seals, and enjoy.
This, btw, is a tedious process. It is MUCH easier to use on a worm-gear unit that's well-used, as you can connect it to a low speed motor, start the motor, and walk away for a day, then come back and pack it full of more toothpaste...
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