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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