After checking the oil level the first step I'd take is to do a pressure/FLOW test on the charge pump. You want to make sure that the charge pump delivers specified pressure at rated flow... if it doesn't then you can start by looking at the suction strainers/filters and advancing into bigger issues like cracked or broken lines in the transmission. If it does make specified flow then you need to pressure/flow test the main pump in isolation of the remainder of the system to see if it's up to spec... and if it isn't... deal with that. If is... then go hunting for the high pressure leak in the back end. Those tractors were WELL KNOWN for developing high pressure leaks and that both deprives you of available flow and generates a massive amount of heat. Given what you describe... that it gets so hot it goes to chattering and not working in half an hour... I would say you have a fairly substantial high pressure leak.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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