Power Steering Problems When Hot!

[HO455]

I would guess that the pressure relief valve inside the pump may be sticking in the by pass position when the pump warms up. Thus you lose pressure to the steering box. You could get a test fitting and Tee it in on the pressure side to see check pressure both cold and warm. But be careful as steering pump pressures can go as high as 1500 psi. Its a pretty common thing in the rock crawler crowd to tear into the pumps and modify them for more pressure. I believe ours are in the 8-900 psi range.