6415 JD tranny overheating? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 07-22-2010, 09:38 AM Thread Starter
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6415 JD tranny overheating?

We have a 04 6415 John Deere with the SyncroPlus Transmission. We are starting to have problems with the Transmission overheat light coming on baling hay a good bit. It is usually on 92+ degree Georgia Humid heat. We have had it run hot in B3 range and in C2 range. Pulling a 468 Baler its not really in any kind of stain. Any ideas what we may could do to help this problem.
Fluid levels are good and screens are clean. We can't find any tranny filter that should be changed. Just seems that it shouldn't run hot so easy with a manual tranny.
Thanks for any info.

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post #2 of 7 (permalink) Old 07-22-2010, 05:30 PM
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This maybe a long shot, but your hydraulic oil cooler isnt full of junk is it? Im not sure where there at on a 6415, but those things need cleaned up like a radiator.

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post #3 of 7 (permalink) Old 07-23-2010, 09:29 AM
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It could be electrical. Better get it figured out though, or it could end up like my 6420, toasted!!

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post #4 of 7 (permalink) Old 08-03-2010, 01:39 AM
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Having the exact problem with the same tractor. Hy-gard transmission fluid and filters have less than 25 hours on them. Cooler is clean as a whistle. Can some one expand on it possibly being an electrical problem. How did toast your 6420?
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post #5 of 7 (permalink) Old 08-03-2010, 09:30 AM Thread Starter
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Quote:
Originally Posted by bamadeere View Post
Having the exact problem with the same tractor. Hy-gard transmission fluid and filters have less than 25 hours on them. Cooler is clean as a whistle. Can some one expand on it possibly being an electrical problem. How did toast your 6420?
I don't believe it is an electrical problem. I found the hydraulic cooler and it is like a heat exchanger up under the belly of the tractor surrounding the driveshaft from the motor to the tranny. Its not real big cooler. I don't believe this has enough cooling capacity for the amount of heat that the summer brings.
If you could plumb in a extra cooler with a fan it might help out but I don't kow a good place to put it.

Street Pulling Project: 1992 Dodge W-350 SRW 4x4 South Bend DD 3600 Pulling Clutch, Superlift 6 in lift,Ladder Bars Engine: 1st Gen Cummins, II SPS 66 Turbo, BHAF, VE Pump Maxed, 2nd Gen Lift Pump,366 Gov spr, Custom Injectors.
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post #6 of 7 (permalink) Old 08-03-2010, 10:21 AM
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BamaDere, I had a 6420 burn up this march and it could have been a electrical fire. THe STOP! red light was flashing on the coldest georgia morning right on up to the hottest days as soon as you cranked it up. THats why i say it could be a electrical problem. Sometimes the wires get rubbed under the cab and can start fires. I have seen a lot of these machines toasted! I've got pics somewhere on here!!

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post #7 of 7 (permalink) Old 08-04-2010, 01:13 AM
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Quote:
Originally Posted by ryanihw350 View Post
I don't believe it is an electrical problem. I found the hydraulic cooler and it is like a heat exchanger up under the belly of the tractor surrounding the driveshaft from the motor to the tranny. Its not real big cooler. I don't believe this has enough cooling capacity for the amount of heat that the summer brings.
If you could plumb in a extra cooler with a fan it might help out but I don't kow a good place to put it.

I think you are right. After talking to 2 JD dealers and a couple of farmer buddies...I now realize the hydraulic fluid is cooled by the antifreeze out of the radiator. The line is really small... The tractor engine had overheated earlier because the screen behind the A/C cooler got clogged with grass. I think the transmission fluid got so hot, that the heat exchanger couldn't catch back up in the heat of the summer. Looks like a marginal design by JD.
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