Type of transmission.
Does it have a loader installed
I have attached the pdf page of the relief valve description and operation.
You do not say why you need this info. Let me end by giving you a big caution. If you are trying to extract more performance from your tractor you also stand a good chance of damaging it.
Hydraulics is not a "Lets try it and see what happens" thing. In a fraction of a second very expensive parts are destroyed.
The integration of a loader into the tractor's hydraulic system greatly complicates things. For one thing, the tractor loader valve may have its own relief valve in series with the one in the block.