Sounds typical for a system staying on demand . Like others suggested, make sure your single and double action setting on the aux valves are lined up, no bent or broken roll pins. If that checks out you will need to take the four bolt cover off regulator, relief valve assembly. Note, heavy spring under cover for relief valve so take out two corner bolts and put longer ones in to avoid things flying apart. You will find a screwdriver head orfice with screen . Depending on how many times it has been repaired over the years, the original had a roll pin through the orfice holding a check ball in place. This check ball bounces back and forth and closes the orfice down. As this is a hardend seat they are difficult to re drill to proper size but can be done. It is only .031 so you need wire gauge drills to do so. Screen most likely is collapsed and plugged, you can cut off bottom to clean and wrap it back up again if it is not broken. Now for the fun part. Sometimes you have to make the hole in orfice slightly larger to compensate for the wear on the lands in the control valves, mostly the hitch valve is the problem. I usually go for about .040 to start with, as if you go too large your system will not pressure up when you use the valves. But first off, clean orfice, throw away the ball, and try that with original size. You will need a new gasket and also replace the o-ring on regulator piston and polish it up nicely.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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