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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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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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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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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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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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Missouri Bootheel | Go with the 85w140, that's what I put in everything unless customer requests otherwise |
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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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Differences in gear oil
