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Ty, I think you are getting close now...That may be your problem. You're trying to push 5 gpm into a 3.5 gpm winch...
Normally, with a PS-system - and not steering- the pump's full capacity can flow almost unrestricted through the control valve body and back to the reservoir. On the other hand, when steering hard all the way against the knuckle stops the valves are fully closed and that's when the pump produces that distinctive hissing- or maybe even whining sound.
In post #5 the OP says the noise seems to quiet down some when operating the winch. And we also heard it gets louder at higher rpm, while the winch is not being used.
Which would indicate that this is not a problem of cavitation, but simply too much restriction...!?
So maybe you are right, and he just needs to bypass that "restrictor", somehow?
G.
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