Another thing to check would be the orings that seal the pump to the tubes that go down into the hydraulic reservoir. They get old and can crack allowing the pump to suck in air.
The tube in the reservoir has a screen on the end of it. It may be plugged with debris. You can check that by dumping the oil and removing the cover on the filter and the filter. The filter is on the back side of the reservoir on the right side. It has 3 bolts with a pipe plug in the center. The filter can be cheaned and reinstalled assuming its there.
Some folks will add a quart of 85W-140 to the oil to help deal with wear in the pump.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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