Yours is a "Stage 1" (belly pump equipped) SM. Its hydraulic system was originally intended for one way (pressure lift/gravity drop) operation. A single hose to the cylinder serves as both the supply and return.
You CAN however use the system to operate a hyd motor. Take the supply from either of the front ports on the belly. Return should go to the pump filler neck, into tee added atop the filler pipe.
Keep in mind the stock pump does not have a lot of pressure/flow - 800 psi and I believe only about 4 gallons/minute. But properly connected (and not overloaded/dead headed) it should be able to power your motor continuously without overheating the oil.
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Nice paint on the old girl! Looks like it's been well-cared for over its nearly 60 year lifetime!
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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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