D 17 Hyduarlic problem?

Mowing the other day and all of the sudden thew D 17 series IV wouldn't lift the haybine. Checked the presser at the remote, 500 lbs. Checked the relief valves, ok. Made a test tee/valve and put it right on the pump outlet, still just 500 lbs. Pulled the pump, replaced the seals between the sections, one looked like it could be the problem. Put it back on still only 500lbs.

What could it be???
 

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