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Sounds like a clogged restrictor

Parts tm should have the current spx part number. I'm pretty sure Parker discontinued the stuff. The parts can be found online with the spx numbers.

Maybe some water got into the system. The check valves are an spx part.

The troubleshooting TMs have flowcharts. One of the repair TMs should have a schematic of the hyd system. I don't think there is anything that shows how it all flows in one easy diagram. Follow the feed and return from the pump to the valve body. Make sure those lines are clear. If the return...

Parts tm shows a good breakdown. There are filters in the valves.

Did you make sure you are not just low on fluid?

The parts tm show a full breakdown of the valve body. There could be a check valve in there. The air hyd lift pumps are a high failure item though.