I don't think there is any rebuilding hem other than replacing seals.
Possibly something has gotten inside it and is locking it up. Nothing to loose by opening it up and taking a look.
If something is broken it probably can't be fixed if internal, special parts are needed. If something shed metal the system will need to be flushed.
BUT! Be very careful, mark the locations of EVERY component! Take pictures, scribe and mark the position of the covers and everything in between. It will go back many different ways, but will only work when everything is correct. Get it wrong and it will do strange things!
As for using the other unit, it might work if it will plumb and mount. The steering might react different, probably slower.
Just be careful, they can shake the wheel violently, spin the wheel, or send the steering to full lock. Keep your hands clear, expect the unexpected until it has proven it can be trusted!
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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