I'm going to step out of my experience and throw this out for what its worth. Maybe someone can confirm it. Most of the power steering pumps I have worked on (Eaton pumps) have a built in pressure relieve valve. If your Ford (prob Vickers) vane pump has one, it should be safe to just to tee in a gauge on the pressure line and start the tractor. The pressure should come up to about 700-1000 psi and stay there.
I think you'll have problems trying to find parts for the vane pump. Eaton pumps are much more common. I would start searching bone yards for a donor. Make sure to get all the brackets, reservoirs, caps and fittings. Eaton pumps rarely go bad except to blow a seal. The seals can be replaced and rebuilt pumps are available.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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