Sometime around 1950 Ford tractors started using "live PTO". Prior to that the power lift for equipment required that the PTO be on and running (turned on by a lever on left side of chassis below the driver's seat). So 'yes' the older tractors (many in use today) require the PTO to be running in order for the lift arms to lift equipment. I find this very annoying when trying to run a mower, especially when the hydraulics don't hold very well.
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