The plug on the regulator valve is on the narrow unmachined side. It's purpose is to test the system. IH had a method back in the day and a gauge with hose hookup before the advent of flow raters etc. By putting a gauge, (2000 psi or more) into that port you can read the pressure when in neutral and when using the cylinder. The only time you should read full relief valve pressure (1200 to 1500 psi) is when your cylinder reaches it maximum stroke, or if you dead head the valve. To do that, being you say you only have one valve you would need to disconnect cyl and plug outlets. No need to do that as long as you can extend your cyl to the end of stroke and hold lever to read pressure. When valve is in neutral, you should read less than 100psi. Far as single and double, that was the main design advantage of this style system. You turn the valve setting to single and you then develop pressure only one way with lever so therefore you can lower a single action cylinder without loading hydraulic system. Some times the pin gets bent or worse, if it breaks you can bend in internal linkage that turns the spool inside. In that case you would have a difficult time getting single and double action without removing and repairing the internals. At any rate, that system has to have a low pressure free flow in neutral or you will ruin pump and all O-rings through out system.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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