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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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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