One idea is you could take the filter out temporarily and run it for a short time to see if the whining goes away...this would answer your flow idea...but don't run for too long b/c you may be pulling dirt into the new pump. I remember asking the dealer one time when I should change my filter and they said every 250 hours, and a total fluid change every 500 hours...I wonder if your documentation says anything about that.
Another idea is to call surplus center and tell them...maybe convince them to send you a replacement on their dime since this maybe a manufacture defect...one you may want to handle now rather than later...then if the replacement whines then probably the issue lies with your system rather than the pump.
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