My "guess" is there is a problem in the Orbitrol unit. Likely a broken return spring, or pieces of something jamming the directional valve.
You can try taking it apart, see if anything looks out of place.
But if you do take it apart, be extremely observant, mark every piece, take pictures, make notes. It MUST go back together exactly as it came apart or it will do strange an dangerous things! Like violent steering wheel oscillation, or spin full to one direction! Keep your hands clear and steer with caution until you trust it.
Probably be best to just replace the Orbitrol.
But, there could be pieces of metal in the system if there was a component failure. There is a filter in the steering pump. Might take a look, cut the filter open see what is there. It will be very difficult to get it all out short of opening the cylinders, flushing the lines, but you sure don't want it getting in the new Orbitrol.
There may be some air in the system. If the fluid is milky, there is air whipped into the oil. It will eventually purge out, usually when sitting overnight. As long as the level is full it will work it's self out, but as the air leaves, the level will drop. It takes several topping up to keep the pump from getting more air in the oil, and it may puke oil when the engine is stopped.
But air should not cause the non steering as you describe. The shaking, yes, but not the non working.
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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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