From my experience when I rebuilt my PS pump, that is not normal. The main working part of the pump is a paddle wheel, not a piston, and internally the seal isn't so good that it won't allow back flow. If yours gets really hard to turn, then the bearing may be failing.
KuoH
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Originally Posted by GreenMarineSVX
(**Note: after spinning the Powersteering pump a few revolutions, it got hard to turn... I imagine that this is normal**)
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