Transmission/differential oil for a G

leon · Aug 24, 2013

I see the manual calls for 8 qt. of SAE 20W transmission oil for the transmission/differential on a G. I can understand 20W if the tractor has a hydraulic pump, but that seems like unnecessarily light oil for a tractor like mine without the hydraulic pump option. What's your thoughts/experience, follow the manual or use something heavier?

steve(ill) · Aug 24, 2013

20 or 30 wt oil is not too light. It is very comon these days to use Universal trans/ hydraulic fluid or HYTRANS, or similar. Most combination hydraulic/ trans on all tractors use this today.

leon · Aug 24, 2013

Right, but back in the days during which the G was manufactured 80/90W GL5 was common transmission oil.

steve(ill) · Aug 25, 2013

you could use gear lube, but some of the bearings and shaft are above the center line of the oil. Splash lube is for a few bearings. My opinion is the tractor fluid is a better lube in that case than the heavier gear lube... but your right, it was used 60 years ago.

steve(ill) · Aug 25, 2013

think of the transmission in relation to an automotive transmission, not the rear axle. Axles and final drives turn slow and use heavy gear lube. Higher speed transmissions are normally thinnger oil. Even new cars with manual transmissions have got away from the gear lube and use a 20 or 30 wt viscosity trans fluid.

Transmission/differential oil for a G

leon

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steve(ill)

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leon

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steve(ill)

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