The first thing to look at is the external steering linkage that goes into the bolster. The universal joint is splined and input shaft is splined. The shaft is supposed to move in when turning in one direction and out when turning the other, moving back and forth on those splines. Any binding in the external parts, all the way back to the steering wheel that will prevent that movement can be your problem. Often the splines wear so bad that various methods of over coming the wear are applied. Some pin joint to shaft, some weld joint to shaft. Some slice joint and weld bolt to it to pull it tight onto shaft. Any one of these methods then require that the entire external shaft all the way to steering wheel move back and forth when turning. If this checks out ok, then the problem is most likely the control valve bolted right under the input shaft. Often nut works loose, or washers break in valve. Next, it could be the mechanism in the worm itself that has stuck which will require pulling unit apart.
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