Troubleshooting Challenge: Unexpected pressure loss while testing a new hydraulic power unit (.PDF Download)

    Nov. 13, 2014

    When I was manager of a large hydraulic power unit (HPU) fabrication shop, we had a strange problem while testing a large HPU. It consisted of a large vane pump, a pilot-operated relief, and a 5-bank D08 manifold with 3-position blocked center directional valves with pressure reducing modules. All the A and B ports contained pressure gauges...

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