I did not mean to separate the relief from the pump. I meant to separate the pump/relief assembly from the rest of the PS system, ie; the bolster. There has to be an external pressure line running from the belly mounted pump to the bolster and this is where you need to check it. You will be checking both the pump and relief, but if you have flow and it continues as you build pressure by squeezing it off with a valve, the pump/relief is fine and your problem is "downsteam" of them, meaning somewhere in the bolster. As I mentioned before, there has to be some form of directional control valve on the input to the bolster. Not being familiar with the model, it may be external or internal to the bolster, and then the cylinder(s) to rotate the output, the vertical shaft down to the front wheels. To use the Char-Lynn as an example, the input shaft rotates very slightly and the output lags slightly... this is where the directional control valve is "doing it's thing" of telling the wheels which way to turn. Same thing has to happen with this... there has to be a directional valve controlling when and the direction to turn. Now, since you say if you turn it slow, there seems to be some power to the steering, it seems to know which way you are turning the wheel, but may be leaking in that area and not building enough pressure.
Some people think the relief valve is "creating" the pressure... it is not, the load it takes to turn the output shaft to the wheels "creates" the pressure, the relief valve only limits the pressure. since the rellief valve does not relieve the pressure externally from the belly reservoir, it will be hard to know for certain if the relief or the pump is bad, but you will isolate the problem to that assembly.
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