Long time later.. here is the update.
The mechanic couldn't get it working. We have installed a PSC big bore box. PSC high flow pump. Still no steering.
I brought the truck back home so I could at least try and work on it again, since the mechanic was slow and uncommunicative.
Removed the pressure line from the box and held it to the top of the reservoir. Tons of flow.
Removed the return line and held it to the top of the reservoir. Tons of flow.
Had a pressure line made at a local hydraulic shop with a T in it. Hooked up a gauge. 0 psi. Idle or revd up.
Called PSC. They said I could hook a gauge up directly to the pump. (I was worried about relief) So I tried that. No pressure.
Checked pressure fitting on the pump. Slick and smooth. No binding. Clean.
Took the reman pump that we replaced with the PSC pump and hooked a drill up to it. Plumbed the gauge in, it built pressure and ripped the drill out of my hand.
Took the pump off to check the cross plate drive. It's smooth, not marked up as if it was skipping or not engaged.
Called psc. Techs said it's possible the pump got pressed back into the housing during install and that could make it not make pressure. So followed their instructions, loosened the bolts and turned the motor over to get it to seat "right".
Still no pressure. Pulled psc pump last night. Saw the spacers are not factory (
other post made about those
) and hooked up a drill to the psc pump. It built pressure.
I ran out of time yesterday, and I didn't want to install the pump without proper spacers, but my next trouble shooting plan is to add a valve to the pressure line past the T, and see if I get pressure as I close it with the truck running.
Psc said pump should be 1500 psi at idle. Makes me think it is just flowing through the box.
During the bleeding process, I did get air when moving lock to lock, but still never get steering.
I can freely move the wheels with a hand when it is up in the air, so no binding of ball joints or linkages.
That's the update.... anyone have any ideas? How do I test the steering box if I get pressure when I close the valve on the pressure line?