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.
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.
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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