Service Manual Damcos LPU: Troubleshooting Guide LPU
SM 8000-100-01 Ed 04 February 2017
60
Emergency operation by hand pump not possible
Reason: • Hand pump is building up pressure, but actuator is not moving
– Slide for shuttle valve is sticking, so that change over to emergency operation cannot take
place (LPU-S).
– Outlet from actuator blocked so that return oil cannot pass.
– Fault on quick connections, so that check valve in hand pump quick connection is not open-
ing.
• Hand pump is pumping oil, but cannot build up pressure
– Leakage in DPCV (LPU-D), bypass valve, release valve, emergency valve (LPU-S) or actuator
• After a few strokes, hand pump is not pumping oil
– Insufficient oil in hand pump tank
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