Thanks guys. We did all of the above and got pump primed and steering started working but we quickly lost it.
Unfortunately I didn't check hydraulic drain plug for water and will do so before we attempt bleeding again. The oil in the filter was clean as was the filter and screen. I did not do anything to the valve in bottom of filter. After reading a few posts on 404 hydraulic filter I was happy to find the main parts were there.
It was missing the 2 seals at the uppermost part of the filter assembly. We will be ordering these along with service manual.
Would these two missing seals cause air issues? I'm assuming it would allow incomplete filtering to pump.
Also the steering valve at the steering wheel has a steady weep. We need to address this but would this add to the priming/air issues?