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Differences in gear oil
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Possum
Posted 8/17/2014 04:00 (#4022222)
Subject: Differences in gear oil


South Carolina
We are replacing the gear oil in the final drives on our cotton picker and the local Deere parts man suggested 80W90 GL5 while the operators manual suggests 85W140 GL5. He says the temps at harvest are not high enough to justify the higher viscosity gear oil. Our temps at harvest will probably not exceed 90 degrees and actually decline as harvest continues through the fall. The viscosity chart rates the 80W90 up to 95 degrees while the 85W140 is rated up to 120 degrees. Don't want the drain and replace the oil that I just put in. Any thoughts????
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MCatSHF
Posted 8/17/2014 08:26 (#4022435 - in reply to #4022222)
Subject: RE: Differences in gear oil



Sandy Hook, MB

Hello Possum

Don't worry about the ambient temperature, worry about the temperature of the gearbox that the oil is running in. Tell your local Deere parts man to stick to his parts! 

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JasonK
Posted 8/17/2014 09:06 (#4022515 - in reply to #4022222)
Subject: RE: Differences in gear oil


East Central Iowa
I would follow the operators manual, unless there is a service bulletin to change to the other oil. There probably isn't much to worry about, but i'm a particular person and always follow what the books recommend. I would suspect that the 85W-140 is used for machines that travel down the road alot. Those finals are gonna heat up going road speed. Just running in the field it would probably be fine.
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IFarmtoo
Posted 8/17/2014 09:17 (#4022534 - in reply to #4022222)
Subject: RE: Differences in gear oil


Eastern Iowa
Not sure what temperature the gear boxes are operating but the book might be recommending the 85w140 because of less leakage at seals also with the heavier oil.
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ccjersey
Posted 8/17/2014 10:14 (#4022632 - in reply to #4022222)
Subject: RE: Differences in gear oil


Faunsdale, AL
I think the lubes are recommended by ambient temperature, not gearbox temperature. At your temps, the quality of the lube is more important than the difference between 80W-90 and 85W-140.
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Deerefixr94
Posted 8/17/2014 15:13 (#4023085 - in reply to #4022222)
Subject: RE: Differences in gear oil


Missouri Bootheel
Go with the 85w140, that's what I put in everything unless customer requests otherwise
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Jim Naden
Posted 8/17/2014 15:56 (#4023164 - in reply to #4022515)
Subject: RE: Differences in gear oil



Southeastern Tipton County, Indiana

JasonK - 8/17/2014 10:06 I would follow the operators manual, unless there is a service bulletin to change to the other oil. There probably isn't much to worry about, but i'm a particular person and always follow what the books recommend. I would suspect that the 85W-140 is used for machines that travel down the road alot. Those finals are gonna heat up going road speed. Just running in the field it would probably be fine.

I am also an advocate of following manufacturers recommendations.

FWIW... on the old 9100 and 9200 CIH Fargo built tractors that ran gear lube in the axles 80w90 was recommended due to excessive heat build up if 85w140 was used. The heat buildup would occur at transport speeds.

Keep in mind that a heavier viscosity fluid will not dissipate heat as readily as a lighter viscosity  fluid. 



Edited by Jim Naden 8/17/2014 16:01
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