Hydraulic pump noise
Moark 05-18-2020
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Hey everyone. We've recently started hearing a noise  that sounds like it's coming from our hydraulic pump. It usually only makes this sound at certain rpms and when the volume control is adjusted higher it seems to increase the noise. We have a 2014 Concord 40meter with less than 600 hrs 

Have called Concord customer service and they have been very helpful in diagnostics but they are out of answers so I'm just curious if anybody has heard this before.

We've changed the pressure relief valve, all new filters, pressure is right at 350 bar, fluid temp is fine, accumulator holding pressure fine. 

gboom 06-01-2020
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what kind of noise do you hear? when it appears, is it a constant noise, and when you adjust the volume, does it go away? i suspect, that there is a bearing inside the pump, that is not 100% anymore, possibly unbalanced, and at certain rpms/settings the noise intensifies, to the point that you can hear it.