Hydraulic relief valve

[BobQ]

I know that there is a relief valve on the loader spool valve, and somewhere on the backhoe spool valve, but what about the 3point hitch? also, I have a 3pt log splitter and don't see a relief valve on that spool valve?

Is there a relief valve somewhere else in the system? and if so, what should it be set at?

I'm thinking maybe a pump relief valve?

Thanks Bob