Do you mean Transmission driven pto? if so then the pto should get a shock load operating a baler and moving the tractor both at the same time. live or independent pto should allow you to bring the implement up to speed and then move the tractor. I don't have particular experience with 850, but I know a friend that ran square baler with equally transmission driven 8N, but he said it is a rough ride and his 8n was squealing pretty bad.
JC,
Ryan,
Out of curiosity I searchd JD 24T and found below video. It showed the mentioned bailer with an engine that ran the baler. Is yours PTO driven or has it's own engine?
YouTube - Baling Hay with the John Deere 24T Baler