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Eaton Hydrostatic pump - charge pressure 500+?

Eaton Hydrostatic pump - charge pressure 500+?

Eaton Hydrostatic pump - charge pressure 500+?

(OP)
I have a set of new Eaton ALC series hydrostatic series 2 pumps.   I have guages in the A and B gauge ports for system pressure.  We are experiencing high charge pressure in one of the pumps.  I have joined A and B ports together and the gauges read 500psi. As I increase RMSs to the pump, the pressure on both sides of the pump increase up to 800psi. I have deadheaded the A and B ports and one gauge reads 500psi, the other went to about 1100psi. The internal charge pressure relief is set at the factory at 300psi. This is what I expected to read at any rpm, not a higher pressure that increases with RPM.  The Eaton rep in on his way but he cannot explain this either.  Has anyone experienced a similar situation?  Could the relief valve have contamination and prevent the relief?
The pumps are controlled electronically and I have disconnected the controls to prevent any stray signals.

Thanks,
awol

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