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Idk man, some pumps just whine. If it is pumping fluid and not making metal flakes I'd run it. The whole truck rattles anyway..

Pretty sure the restrict or limits the flow to the winch to keep from destroying it, kind of like a hydraulic shear pin.

That isn't a bad idea to run it the same way the HMMWV does. You just need a bigger tank or one better designed is all.if you had a tank that was deeper but narrower, with the intake fitting on the very bottom and the return on or very near the top you might get away with the one gallon size...

Tractor supply carries small capacity hydraulic tanks, 3-5 gal sizes. Or you could just use an old air compressor tank if you can find a small compressor that the motor crapped out on. You'd have to do some mods to it in order to plumb the lines in. Easy if you can weld.

If you went with bigger suction hose it would get worse. Ever notice the little whirlpool that happens when you drain a bathtub? That is what is happening in your tank, and why it is sucking air. How do you stop the whirlpool in the tub? Notice it only starts when the fluid (water) gets low...

He gets away with it because of two things. # 1: the fluid has a longer path to travel before it goes back to the tank ( notice when you use your winch things quiet down, that's because you lengthen the fluid path temporarily), this allows the whole system more capacity and opportunity for...

Ok Dan, the foam has settled now and that is why most of the whine is gone. It is still whining at more throttle because the reservoir is too small. That pump is pulling fluid from the tank and circulating it back, then picking it up again before it has a chance for any bubbles to settle out...

It is just air. The fluid gets foamy because the pump is cavitating. If you go through this a couple more times and it doesn't clear up then you need a bigger tank. That tank is awfully small for what you are doing with it. I would think more like 3-4 gallons or even 5 would be best. Remember...