O.K. Waited for the 300 Power Steering manual to come from ebay... and it's for the wrong system. I didn't realize there was another 300 PS system that had a hydraulic motor in the valve body on the column.
So anyway, the gauge went on both outputs from the valve body on the steering column this morning and I got 500psi at the pump and at both outlets...from a 1400 psi pump, so I went hunting for the bypass. Clearly the system was bypassing while it should be working.The spool seems to have minimal wear, has a really tight smooth fit, but on the bench with 200psi of air going in, it was letting a lot return when moved to either extreme. We decided to experiment before sending Mr. Jackson his check and are in the process of turning .075" off the outer O-ring face of both spool retainers...or whatever they're called.... the top and bottom pieces that seal on the spool and move with it...so as to provide an additional .075" of movement each way of the spool inside the valve body. Don't know if it'll solve the problem, but it works with air on the bench...all the pressure goes to the outlets at the new full travel and nothing bypasses.
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Today's Featured Article - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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