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Phil - There's a turnbuckle behind the grill, connecting a bracket on the main vertical shaft to the control valve on the top of the power steering cylinder. That's where the action is. If you watch the valve while your trusty assistant rocks the steering wheel from side to side, you'll see the valve spool move - probably only one way, and back to center. Very slight movement - 1/16" or less. That movement is all it takes to energize the power steering. You will also see slop in the pins connecting the linkage, possibly the turnbuckle itself is flopping. Because of the very little movement needed, the slop may not allow enough travel to operate both ways. Try adjusting the turnbuckle first to get travel both ways on the control valve spool. If the spool is pulling out and not pushing in, lengthen the turnbuckle, or vice versa. A caution: be careful not to shorten the turnbuckle too much. If you pull the control valve spool too far out, you can bugger the retaining snap ring inside the valve, and the valve will leak. And that's a really tricky problem to fix. Loosen the lock nut(s) and rotate the turnbuckle 1/4 turn at a time, turn the wheel back and forth, check the spool to see if you're turning the turnbuckle in the right direction to get spool travel where you did not have it before. If that doesn't give you enough assist, the next step is to replace the pins. They are almost always worn. (Who would ever think to oil them when servicing?) Readjust the turnbuckle. If that doesn't remove enough slop the next step is to redrill the holes in the spool, turnbuckle rod/end, and casting and replace with next larger size. We had to reenforce a couple of the holes with brazing. Hope this helps.
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