Pump motor not working properly

cr430c

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Wmo Pump motor not working properly

So I got my setup all together. I've got a leeson 1/3 hp motor connected to a haight gear pump going to a 55 gph pabio centrifuge. My problem is that I power up the motor and I start to throttle down my bypass to build pressure and around 40 psi or so the motor starts to bog way down and will pulsate. What would cause this? Do I need more power, is the oil too viscous, is my whip gauge too small? Any suggestions would be awesome. Thanks in advance.
 
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