It was my first day harvesting beans with a 6620 hydro(a big step up from the 4400 i have used for 7 crops). All was going well until i began to smell smoke, so i quickly shut down and jumped out to find the source of the smoke.Smoke was coming up above the transmission, so i quickly ran the combine back to the yard and grabbed the garden hose, it was the left brake drum and luckily i didnt crack it.Once it cooled off i give it a good bath an wiggled it and made sure the brake shoes had retracted.Then i returned to harvesting and had no more problems.But that smoke smelled just like when i torch a stubborn bearing to get it off a shaft. I wonder if i have buggered some bearings in the transmission by using the brakes today.Anybody experience this with there 6620 hydrostatic combine