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I think the problem is that the hydro cylinder/steering box/pump bleeds off a bit of fluid/pressure so your tires will end up in a different spot each time you turned the steering wheel back to center. Using a standard steering box instead of an orbital valve will cause you to hit mechanical stops and probably do so before your tires pointed where you wanted them to. I'll go ahead and tell you it won't work, you could hook it up and make it move the tires, but it won't always allow you to turn as far as it should nor consistently give you steering in both directions. An orbital valve has no stops so if you need to turn the steering wheel 10 times (to compensate for any bleed/fluid bypass) to get the knuckles to hit the stops you can.
I think the problem is that the hydro cylinder/steering box/pump bleeds off a bit of fluid/pressure so your tires will end up in a different spot each time you turned the steering wheel back to center. Using a standard steering box instead of an orbital valve will cause you to hit mechanical stops and probably do so before your tires pointed where you wanted them to. I'll go ahead and tell you it won't work, you could hook it up and make it move the tires, but it won't always allow you to turn as far as it should nor consistently give you steering in both directions. An orbital valve has no stops so if you need to turn the steering wheel 10 times (to compensate for any bleed/fluid bypass) to get the knuckles to hit the stops you can.