As my late father used to say "I see it all now....some of it".
If the PC has been removed then that would explain it. If you look at item 84 on the attached parts page that is the relief valve which screws into the upper right hand corner of the back plate of the pump.
It is cylindrical, about 5/8" (16mm) in diameter and about 2 1/2" (60mm)in length. You should soon be able to see or feel it.
With the PC components removed the PC control lever will have no effect in the PC quadrant. You will have full hydraulic pressure as expected in the Position Control quadrant.
The pumps are the same, the PC one has a plug in place of the RV.
2500psi is correct essentially for round rear axle tractors.