Your description of movement sounds normal. With draft control lever on light toward rear it already pulls the valve out and with it on heavy, which is where you should leave it then the position control lever would move the valve (block you are seeing move pulls stem of valve). Make sure that when you push position control lever all the way forward into offset that it contacts the action control device and moving lever in and out of action control (offset) that valve lever pivots. The action control mechanism just dumps oil supply to slow hitch reaction time. You either have no or only slight flow from pump, unloading valve sticking in draft control valve assembly or fluid is just leaking away , looping around in valve section. You can take pipe off from hitch pump to check free flow in a bucket but if you cannot deadhead system it is pretty hard to simulate stuck unloading valve. You could put a valve in the looped hose and partially restrict flow. I just have to assume the system relief valve is still intact in the aux valve body mounting plate.
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