The valve listed as safety valve is the relief valve, regulator valve is the unloading circuit which operates in conjunction with the screen orfice and the regulator land on control spools to return system to low neutral pressure . Same basic idea as 300, 400 560 etc. The extra valve to operate hitch is a flow through type ported through the base to utilize same relief valve as rest of system. You can hook a gauge into the line going to hitch to check relief valve. I would advise using a flow rater or a valve in line with the gauge so you could very gradually restrict flow just in case some one installed something wrong in relief (safety) valve giving you too much pressure. I don't know pressure off the top of my head but I am thinking 1200 psi.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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