Dirty B
It is hard to tell if that relief on page 146 is for the 3 point or a main system relief. Can you follow the pressure line from the pump to see what it is connected to? First item connected should have the relief valve in it.
Pump connects first to block 12 in the attached image, which the parts manual lists as Valve Assy, PTO. So the relief valve is part 12-02. If the diagram is correct that side of the assembly is bolted up against the transmission and not accessible.
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/ Backhoe boom struggles to go up, drops when feathering up
I found this video with a TYM tractor (same manufacturer, and the PTO valve looks identical to mine. ) I see the same set screw and it is on the side opposite of the soleniod, not against the transmission. So maybe the drawing is inaccurate...
