My M6060 has 278 hours on it and I haven't owned it 2 years yet. It's about 5 miles one way by road to the fields I've been making hay in. Pulled the baler over to the field and after 7 or 8 bales (4x4 bales) it started loosing rpms. It finally was down in the 300s when we took the baler off and finished with the Massey 255. I drained the fuel tank, blew out the hoses and changed the fuel filter. Checked the air cleaner, clean, changed the hydraulic-trans fluid. Nothing helped so Monday I took it to the dealer. They had it all week, pulled the fuel tank, blew out the lines and put it on a dyno for 2 hours and can't find anything wrong with it. I'm going after it tomorrow morning and will see what happens. My thought is, the tractor was sitting in the shop running while on the Dyno and will probably do the rpm drop again when it goes in the field running on rough ground. Anybody have an idea what I should check when it does it again.