The 30 to 60 psi they are referring to is the standby regulated pressure of the main system when in neutral. It may or may not run in that range but is not really important and long as it is below 100 psi. It is checked at the test port on left side of the regulator valve assembly. It is controlled by the regulator piston from the flow through the screened orfice in regulator valve . I feel you have flow divider valve problems if that plug you are talking about has a 0-ring on it and is sealing good. Those flow dividers are notorious for wearing the land on the spool. The spool cost about 80 dollars a few years ago. They unfortnately also wear the bore sometimes and with age a good percentage of them will be worn. If you haven't had the flow divider spool out you need to do so and take a look at it. Make sure spool is in the correct way also by referring to parts book. I don't think the regular service manual shows it. There is also a ball type relief valve for power steering that can be taken apart. It is a seperate relief valve from the main relief (safety) valve. The steering flow divider circuit should produce 1200 psi when reading directly at the outlet to power steering unit with hose off and gauge dead heading the circuit. The flow divider block can be rebuilt but it is expensive and I don't know the machine shop that does this but it has been addressed on here before.
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