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Mine had a max and min fill line on the little view window. The pump began cavitating when the fluid was below the min mark. I used a long piece of plastic tubing inserted into the oil can like a soda straw, then sucked the oil up in the tube until it was a few inches from my mouth, then pinched the hose off, moved the other end of the hose from the oil can to the fill hole (having already removed the little screw) and let the oil drain from the hose into the reservoir. The tubing was very small, like weed-eater fuel line, so it took a couple of repetitions to bring the level up to the max mark. I then cycled the top, and the cavitation went away, and the reservoir level dropped slightly, as I suppose some air was flushed from the hydraulics. It didnt take much to fill the reservoir from min to max, probably only an an ounce or so, like half a shot-glass full
HTH.....
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