A fixed displacement pump can be loud right out of the box, but super loud says cavitation. I'd double check that the HP pump, the feed pump if present and the filter system are not sucking air somewhere.
Also was the initial fill of coolant for the new machine made using tap water like is normally suggest? If it was started with all DI/RO water, that is also part of the problem.
That is a worry, is this pump causing cavitation, I did back track from cutters, to coolant line, to coolant filter, to pump, to make sure the foamed product was being caused at the pump.
And to be fair, this machine is only 2 month old, and I am so used to using the DI water on all the other machines, my dumb ass did fill the entire tank with DI on startup, so I spent a few weeks adding tap water after the first beer head incident and I realized,
"you dumb ass you filled it with DI"