If you get a hold of the 300 & 400 hydraulic system service manual it has the very best explanation of the system you will fine. It of course does not get into teledepth valve but that does not matter with respect to how it operates. It is very well illustrated. When I first started working for the IH dealer in 1958 I carried my lunch to work. During noon break I would sit down and go through the service manuals. Heck, I had no intention of being a tractor mechanic, thinking cars, but no way could find a job so just tried IH temporally and still working on tractors.
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