Gear oil??????

Goose

Well-known Member
Am I right in assuming the trans and rear end in an M Farmall would take plain 90 weight gear oil? I have two manuals that apply, but they just give the capacity, not the type of oil.

Thanks in advance.
 
(quoted from post at 15:27:04 04/16/15) Am I right in assuming the trans and rear end in an M Farmall would take plain 90 weight gear oil? I have two manuals that apply, but they just give the capacity, not the type of oil.

Thanks in advance.
it would be the old 80-90 wieght in a nonsynthetic oil as what these old tractors use. yes trans and diff. same oil.
 
Not arguing with others , there was no hytran when this tractor was built and unless you have give the rearend and transmission a complete overhaul there is wear and slack , I would use 140 gear oil as I think they run quieter with thicker oil. This is my opinion only .
 
(quoted from post at 01:00:18 04/17/15) Not arguing with others , there was no hytran when this tractor was built and unless you have give the rearend and transmission a complete overhaul there is wear and slack , I would use 140 gear oil as I think they run quieter with thicker oil. This is my opinion only .

I use 85W140.
I used 80-90 in my Farmall 140 and it was considerably louder and more difficult to get in gear. 50-60 years of use has worn things in a bit.
I use 85-140 now in all my Farmalls and its quieter.
 
if your diff, or trans os noisy she needs more attention than thick oil. for the winter she will be hard to shift into gear till it warms up. but for heavy pulling in 80-90 degree weather it is ok.
 
I would NOT use 85W-140. The trans bearings are all splash lubricated on the M's and H's. The gear oil has to be able to fling around and flow easily. Things like the pilot bearing between the top input shaft and sliding gear/pinion shaft will be starved for lube in cold temps. Hy-Tran would work well in cold temps but in warm temps is too thin bodied to stop the transmission gears quick enough when shifting from neutral to any gear. Dad put Hy-Tran in the M back in the 1960's for about a year. That was a long year using that M as a loader/chore tractor! I would not go any higher than an 80W-90 weight like IH recommended.
 
Well, I live in Wisconsin, and when I push snow at Zero degrees in winter even 80W-90 weight doesn't flow. 85W-140 WAY TOO thick/heavy. I've got some 85W-140 in a bottle jack and it stops working around 30 degrees. The oil will not flow into the piston pump.

You have to consider ALL areas of the US when you recommend things.
 

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