JD 6620 with rubber/hot smell - found no problems

andy r

Member
I asked about a burning smell coming from my John Deere 6620 combine yesterday. Got some good ideas regarding specific problems. So, I went and harvested a wagon load of corn this morning and immediately pulled the combine into the shed and shut it down. Worked around the combine touching every shaft and bearing feeling for heat and looking for damaged grease seals, etc. Nothing was hot. Everything looked and felt good. Was able to grab the counter shaft immediately at the edge of the bearing on both sides as well as feel the locking ring, bearing and bearing holder/block. Absolutely no heat after 30 minutes in 250 bushel corn. Seems like the smell is maybe getting less. I wonder if a belt had some oil on it and when the belt warmed up it gave off this odor. Possibly the same thing happens when all of the dust and chaff laying on the combine warms up. I did have several hydraulic hoses off this summer. So, I will continue to keep an eye on it doing a walk around and feel a couple times a day. I sure didn't want to rework the counter shaft at this point of harvest. Looks like it may have been rebuilt at sometime as the bearing holders/blocks look like new paint. Thanks for all of your suggestions.
 
My 7720 has that smell sometimes, but I never have found out what causes it. When I was using it more I would flip the seat up and wash out under the shafts often.
 
It's a very uncomfortable feeling,,makes you think it is gonna burst into flames before you make another round....
 
Keep the dust and chaff cleaned out and carry a fire extinguisher. Have heard of plumbing a fire hose into engine coolant line to have more extinguishing power than a red can. Anti freeze is much cheaper than the insurance deductible.
 
I don't know what the deal is but I would be very concerned until I find the problem.

3 combine fires around a 80 mile radius here in S. IL. in the last hour and half.
That brings the total to 10 fires since Mid September.

Something going on.

I bet the tier 4 diesels re-gen has a lot to do with it?
Tom
 
Glennester , I will second that. I cannot see how any farmer can afford to be without one since they have got so cheap. Best tool in the tool box. Man can compare bearing temps and tell if one is about to go. Just too many advantages to not have one.
 
Just a thought but what about maybe dust on the exhaust manifold? Hot dry weather, bean dust, little oil leaking or spilt gathering dust? Seen it or I should say smelled it before on a JD where you sit right next the engine.
 
Without knowing for sure what the problem might be I would be cautious of parking a hot combine immediately in the shed. when harvesting beans or corn we always try and let the combine cool off outside before parking in the shed for the night
 

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