white tractor

I have a white 2-44 industrial tractor. I have serached for service books and can find every model except this one. Anyway my hyrdaulics on the front loader all of a sudden are acting up. I put a pressure gauge on valve and am getting 500psi hyd pressure. It seems low to me. I'm told the pump was removed last fall and checked at a shop and works fine. Another symptom is it chatters almost as though there is air in the system. I thought cycling through the hydraulics would clear the air back to tank and out the breather. Doesn't seem to clear the chattering.
Any ideas out there?

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