I see you have replied since my Classic and Modern view situation occurred. If a coupler has become incorrectly connected then the same result should happen when the lever is held the direction you normally had it bungeed, it should open the bypass valve as it does when you moved it the opposite direction. If it is not doing that I would simply suggest swapping the hoses in the remote one to the other and retry moving the lever the opposite way to see if that will make it work. If the hydraulics went into bypass and loaded the engine slightly when you moved the lever the other direction that is telling me the hydraulics are capable of building at least some pressure.
You said.. is it possible I pulled all the hydraulic fluid out of this secondary circuit when I pulled back in that lever?.. The valve and loader really have no ..reserve.. of fluid other than what is in them to perform their functions. So no you did not ..suck it dry.. so to speak. By having that valve bungeed in position which is a common method you are directing oil to loop through the hoses and valve, which is by the way is an ..open center.. system. When you move a lever on the loader valve you simply direct the flow into the cylinders at the proper ends to get them to extend or retract. The valve at the same time opens the opposite line of the cylinder to the return hose so it can exhaust fluid. When you release the lever and the spool centers the fluid is blocked from entering or exiting the cylinders and the pressure oil from the tractor just returns to making a loop. Since liquid cannot be compressed the fluid ..blocked.. inside the cylinders holds them locked into position unable to extend or retract.
If reversing the hoses and direction of the valve make it work something has failed inside the tractors valve.
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