Question, does the pressure decrease if you loosen the adjustment on spool or does it just stay the same until you loosen it way up. If it lowers as you turn valve out of coupler, I think you are not getting full pull on valve. Those linkages were poor on the 656 and I have repositoned a couple to get more lift on valve. Other wise, you could put in a higher pressure valve. I am not sure if it is a direct exchange of valve like the larger tractors or not. You know, initially a 706 etc was 185 psi and later the larger tractors were increased to 235 psi and I have installed that valve in a lot of older tractors. Requires new valve, nut with seal in it is different and the spacer changes to a thick washer under adjustment nut. I have never seen a pto pump go bad either but if it is bad your low idle pressure would be zilt.
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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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