I am not much of a maintenance or troublshooting guy but I have two thoughts.
It sounds like pilot bearing trouble. Although I have and use a 504, I have never had any clutch or TA problems so I don't even what kind of access you have for testing the pilot bearing even if that can be done.
The other thought is the integral IPTO gear and hollow shaft is putting a drag on the clutch shaft, that runs inside of it, when the clutch is disengaged. Not sure if there is access to clean that annular space with air or high pressure water.
Apart from those two suggestions, I think most people would say you have pressure plate or clutch disc problems. They may be right. Have you tried Red Power forum?
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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