SMTA pressure relief is in the reservoir housing. Maximum pressure supposed to not exceed 1200 PSI on those. That's why when IH added a remote control valve without a built in relief they teed the pressure line from the pump into the valve and on into the hydraulic unit. Also why the lever has a little latch on the side of the reservoir. Lever was latched back to keep the oil from circulating through the unit and back to the pump so pump pressure went to the remote control valve. Set up like that the factory relief valve worked for the control valve also. Original poster could plumb the valve to use the same pressure relief if needed.
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Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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