Damcos LPU: Troubleshooting Guide LPU Service Manual
February 2017 SM 8000-100-01 Ed 04
67
LPU cannot raise pressure after hand pump operation
(but no problems after remote operation)
Reason: • Leakage from LPU to hand pump.
– Portable hand pump must be disconnected.
– Make sure that by-pass at possible bulkhead hand pump is closed.
– Try to operate valve in the selected direction by hand pump first, then by LPU. If LPU can raise
pressure now, the DPCV valve slide has too high friction. If problem is not solved DPCV is leak-
ing due to defect non return valve or slide is sticking.
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