I have a 7510 that had the same noise as described on your forum. Transmission noise under no load. Noise leaves when tractor is pulling. The fix is very simple. The dust cover surrounding the drive line going to the front axle has a nylon bushing in the end next to the transmission. The bushing gets dry and galls from lack of grease. Replace rear half of dust cover or bore an eight inch hole and make sure hole goes through nylon bushing. Take a grease gun that you use on the nose of a chain saw bar and grease through hole. Seal with silicon. I would reccomend you grease the bushing every twelve months or when the noise starts again.
HAPPY TRACTORING!!!!!!!!!!
HAPPY TRACTORING!!!!!!!!!!
