Karl: Aside from what Jim has said, one needs to know how the plumbing is done. I presume the added reservoir is either coupled to fill or drain plug and has a breather added on top, right or wrong?
Where is the Gressen valve plumbed into system? To work it must have a pressure supply from the tractor system and it must also have a return line back to the system. Beyond that there must be ports for cylinder supply, one will be single action, two will be double action.
Most of these received the pressure supply from a block spacer about 1/2" to 3/4" thick and bolted between hydraulic manifold from pump and the touch control unit. That block has a port for pressure supply to the valve. The return line just has to return oil to the reservoir, during the time your not activating the valve, probably somewhere between 80 and 98 percent of the time tractor is running.
I've also seen these plumbed several other ways, one being a power beyond valve with it's own pressure control and plumbed into high pressure line from pump and the return line from valve putting pressure to touch control system.
Any way this is achived, one must have a pressure line from the system and a return line back to the system. Oil must go somewhere during times the valve is not activated and supplying oil to cylinder or cylinders.
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