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[mlappin]

They don't have any oil cooler and say it is not meant to run hydraulic motors because it will get too hot. They have an optional model that has a cooler and I think a second reservoir that is supposed to be for running motors. I think the pump may be the same but they add a second valve.

Okay, betting on a open center gear pump, usually when using a gear pump to run a hydraulic motor they need matched pretty close and usually if you don't have a oil cooler then the reservoir needs to hold as much as the pump GPM. A variable displacement pump would only output as much as the hydraulic motor on the pole saw could use, more or less.

And yah, like Bondo said, don't need another bung in the tank, just need to find a return line to tee into, usually plumbing a return like this is called a zero return, as in zero back pressure. Even on our closed center variable displacement pumps on our tractors we still plumb in a zero return as it will greatly lower operating temps and usually extends the life of the seals in a hydraulic motor.