As was mentioned you are most likely pulling in air at one or all of the large suction line fittings. There are rubber seals in each one. You might get by with just tightening them all up but they are 70 years old now so you might want to think about replacing them. They aren't very expensive from Deere.
Another possibility is it's bypassing inside. Using the wrong oil will make it worse. I use 20 or 30 wt non detergent motor oil. It won't foam, works better and leaks less than anything you can put in there. It's in the motorcycle section at my local Advance auto parts.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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