JD 6620 brake drum got hot

Jo-ker · Oct 10, 2016

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

Bob · Oct 10, 2016

Could be lots of things... from the brake shoes and mechanism being worn and falling apart and binding to the TINY return hole in the master cylinder being rusted/restricted/plugged, and not allowing fluid to return to the reservoir after brake application, as the shoes retract, and so forth.

JD Seller · Oct 11, 2016

Did you set the parking brake???? The cable maybe sticking. With a hydro combine you do not use the brakes as much. Turning and steep hills but the rest of the time KEEP your foot off the brakes. Your used to the JD 4400 gear drive. There you used the brakes a lot. Now you don't.

andy r · Oct 12, 2016

This exact thing happened to me a couple of years ago. Finally figured it out. Once it happened when I wasn't even using the brakes. Anyway, there is a little hole in the bottom of where the brake fluid is. Believe it or not this little hole gets plugged and brake fluid can not release cylinders allowing the brakes to retract since it is trapped in the line. Rust and debris gets trapped in the hole plugging it off. I took a turkey baster and sucked the brake fluid out. Got a safety pin, straightened it out, and used it as a probe to 1) find the hole, and 2) poked and probed the hole to clean it out. Might have used a small drill bit which I spun between my fingers to clean it out. Worked well after the cleaning.

My right brake got red hot and smelled without even using the brakes. Since the little hole was plugged and brake fluid could not flow backwards, all of the heat under the combine caused the fluid to expand, thereby, expanding the brake shoes and applying the brakes enough to get them red hot. Actually caused some chaff to burn laying on top of the transmission and axle.

JD 6620 brake drum got hot

Jo-ker

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Bob

Well-known Member

JD Seller

Well-known Member

andy r

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