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Re: 641 Power Steering Conundrum - 2nd Verse
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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.
Photo of an Eaton pump on a 660.
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