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John Deere Tractors Discussion Forum
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Re: 620 tranmission fluid

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DP

02-10-2013 08:57:18
208.92.171.142



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The seals on older tractors will some times seap with the lighter oils. Biggest thing about using the right oil is that the lubrication of these transmissions and rearends is designed for the oil to carry up through the gear teeth to the upper shafts and bearings. A lighter oil will not carry up through the gear driveline to lubricate everything.




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jdjack

02-10-2013 10:17:13
174.124.110.99



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 Re: 620 tranmission fluid in reply to DP, 02-10-2013 08:57:18  
Yes, I understand that the lower gears fling the gear lube up to upper gears, dont you think that the light fluid would fling better when cold?
Then in warm weather I think that it still would fling all over.



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gtx1967jewison

02-10-2013 10:26:32
174.253.145.150



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 Re: 620 tranmission fluid in reply to jdjack, 02-10-2013 10:17:13  
It dont 'fling' up there, things turn farthe too slow for that. it needs to be carried on the gear teeth to the top & then runs down onto bearings etc. The newer machines use oil pumps to get the oil up there. I still think it would be fine with newer style oil though.



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jdjack

02-10-2013 13:53:59
174.124.110.99



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 Re: 620 tranmission fluid in reply to gtx1967jewison, 02-10-2013 10:26:32  
I understand that tractors werent used in the winter as much as the summer. But at 0 degrees 140 weight oil can't be fling around in there much, espcally if the gears arn't moving very fast.

What gear lube weight will work good and still be able to move the shifter, without blowing a nut.
winters temps get down to -30



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gtx1967jewison

02-10-2013 18:17:26
174.253.145.150



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 Re: 620 tranmission fluid in reply to jdjack, 02-10-2013 13:53:59  
I run 5w-50 synthetic in the engine & half 90w gear lube/half hytran in the tranny on my 41 A, hand cranks at -30 &the shifts decent. You just cant have any water in there.



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