Oil for old tractor transmission

Some of the older catalogs for hydraulic equipment recommended the use of engine oil as the pumping medium-I believe you would fare ok with the multi-grade you mentioned.
Good luck, Tom

Consider the use of 5o weight transmission oil for use in heavy truck transmissions. early 13 speed trannys used mineral oil but later specifications use 5o weight motor oil. delvac makes an excelent transmission specific 50 weight that i have used for 950000 miles in my eaton super ten. I belive that 50 weight motor oil and 90 weight gear oil Viscosities are the same. Good luck.

50 weight motor oil is ROUGHLY 140 - 250 cSt

90 weight gear oil is ROUGHLY 135 - 350 cSt

Hello Old Farmer,
The 80W-90 will actually have a better low temperature start-up than what the origional SAE90 would have. The warnings regarding the usage of EP's was lifetd by AGMA a few years ago, assuming certain conditions were met ie less than 90 degrees C. This of course assumes that you are using an oil from a recognised OEM blender. If your winter ambient temperature conditions are less than -10C or so then you might want to consider something like a 75W-80 gear oil (~47 cSt @ 40). Or if you think that you just need a lower start-up product then you could consider a 75W-90 product. These are avaliable from most of the major NA suppliers.
An engine oil like 15W-40 has a vis @40 of around 110 cSt @40. Again if you have start-up temperature concern issues you could select a 0W-40 product this would lower the pour point to very low temperatures -35C (you probably wouldn't want to be operating yout tractor at these temperatures)

hope that helps

i suggest dont use synthetic motor oil in your tranny. try the regular dino oil for your temporary fix.
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car parts | tammy beede | -85-