I would just replace them. They aren"t that expensive. But if you insist on repairing them, make yourself a mix of mineral spirits and marvel mystery oil or a good penitent such as Kroil, or if you can find it anymore, SOAK, Polywater P7, another is SP3. Liquid wrench is ok in a pinch. I am presuming the collar is frozen and not sliding smoothly. Make sure and remove the rubber components and soak the connector in the penitent. If you have a hot plate, set it on low and heat the coupler and penitrant. This does two thinks, it thins the penitrant and allows the metal components to expand allowing the penitrant to more easily wick into the cracks and crevices. Do not use any alkaline or acidic corrosion removers as they can get into places you cant get them out of and this will cause problems later. Once you get the collar free, then check the balls and the pop it valve and spring. if any of these are pitted or the spring is rusted just scrap it and get a replacement. If all looks ok, find a ultrasonic cleaner such as a denture cleaner and vibrate the parts in a clean batch of penitrant for a few hours and then make sure that everything is free and properly functioning. Rinse the assembly with clean solvent and install new "O" rings and seals. Reinstall it on your tractor and see if it works. If not then go buy another.
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