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In Reply to: Re: counter-balance for 300 with loader posted by peter Taylor on Wednesday, May 07, 2008:
Peter: You probably still have some air. If I recall correctly, this is a utility model and they can be a bit more troublesom than the Farmall. The hydraulic reservoir and controls sit lower on the utility thus oil doesn't flow to the pump. Find a spot to park tractor with front wheels about 18" to 24" lower than rear wheels. Most 300s had a plug in the side of the pump, and with tractor parked as I suggested, oil will flow down grade to pump forcing air ahead of it. The air should escape through the open port on the pump. Once you have solid oil on the suction side, the pump will force it through the pressure side. These pumps are not very good at pumping air. You may still have to use air at the fill plug to get the oil moving.
I've ocasionally had to do this with a Farmall, but roughly 12" lower on front wheels will work in that case. The goal is to get the reservoir higher than the pump, then liquid will run down hill.
Another trick that works when you've have those hydraulic lines off, is poke the pump ports full of vaseline. Quite often the pump will grab onto the vaseline pulling oil behind it. The shape and routing of those lines don't help.
If this doesn't work, bad news, very likely you need a new pump.