Reading your description of the problem, I assume you mean the hydraulic system builds pressure. First test is with engine not running. Does lever stay in detent position in both directions. If not, you need to correct that first, linkage to valve or problem in valve. If it does latch ok, start engine. If it kicks lever back to neutral you then know fluid is restricted some where between valve and cylinder. As you said you changed couplers, (which is normally the problem) I would look to see if you have a check valve block in the system and suspect that. When problems like this develop it is often best to just eliminate all couplers and hook hose directly together to determine where the problem lies. Now if the levers just stay in detent when you start engine you have a lack of flow and pressure from pump, relief valve or blown O-rings on pump mount.
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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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