I would get a hold of a 300 400 hydraulic service manual. It does the very best description of that hydraulic system. All the later manuals for 460 etc do not detail the flow. When I was a youngster just starting to work on these tractors, I read the manuals during lunch break as I was living out on the farm at the time and did not go home for lunch(dinner). It is actally a closed center valve on there. When all valves are in neutral the flow it to the reglator valve. Flow through the orfice screen forces the regulator piston down onto the unloading ball and seat and dumps the fluid right back into reservoir at a low pressure of maybe 30 to 60 psi. No flow is going through any aux valves. When you operate any aux valve, you first uncover the port to the orfice screen, much more oil flows through that port than can go through the orfice so the regular piston moves up allowing ball to seat and flow is directed to out port of aux valve to work port. Other work port is internally connected to reservoir for return oil. The fluid is still ported to the relief valve in regulator block assembly so if work port is blocked the fluid opens relief valve and dumps to reservoir. When you switch valve to single action, the land over regulator port to orfice always remains blocked when aux valve is operated in drop position therefore the regulator valve keeps on dumping oil. The teledepth valve is same basic valve as the rest except it has follow up linkage that return it to the neutral position through a differential type gear and lever arrangement. Now, clear as mud right, but I am a mechanic not a manual writer. Hopes this helps some. But, the 300 manual is good.
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