What To Use In SuperM Rear End?

Bryce Frazier · Mar 21, 2017

What type of fluid / oil should I run in the rear end of my Super M Farmall? Guy at Case dealer told me to go with a Hi-Tran / Universal fluid, however that seems to me like it is a little too thin? What about like a 90W Gear oil? Too thick?

Goose · Mar 21, 2017

I have 90W gear oil in both of my H's and my M.

onefarmer · Mar 21, 2017

I put 90w in my M.

NEKS · Mar 21, 2017

My Super M-TA Operators Manual says to use SAE-80 from +90 degrees to -10 degrees. It holds 15 gallon.

VicS · Mar 21, 2017

90w takes to long to get to the top bull pinion bearings. Quit having bearing problems when ihc went to light oil. That was back when those tractors were really used. Today when we don't really use them probably doesn't make much difference.

ss55 · Mar 21, 2017

Hytran / Universal has worked well for 50 years in newer tractors that are much much more demanding than a Super M. Are you looking for oil less expensive than Hytran / Universal? Idaho is towards the colder end of the temperature scale for tractor fluids.

the tractor vet · Mar 21, 2017

IN a super M tractor with out a T/A you used 90 weight .

the tractor vet · Mar 21, 2017

In your S/MTA you USE hytran ONLY as they went away from the 80-90 with the additive shortly after the 400's came out due to T/A slippage in colder weather . and the additive was done away with .

gene bender · Mar 21, 2017

90-140 wt

matthies · Mar 21, 2017

I know some tractor ride guys that tried universal/hytran in there red letter series and couldn't stand the gear noise and went back to gear oil. These guys put 50-90 miles on a day.

Bryce Frazier · Mar 21, 2017

Well, this is my main pulling and working tractor, 3 bottom plow, CrustBuster, swather, combine, it does a lot of everything.

I am not that worried about the cost, either way it is going to cost a good bit I suppose, I just want to use what is best for my machine. I plan on keeping it for a long time, and I want to take very good care of it!

Personally I am leaning towards 80W-90 (which I can buy bulk in 5 gallon pails at a good price), just because that is more like what they came with, also, I imagine it is a lot thicker, so it would hold up better during the warmer months (tractor is rarely run in winter), and there would also possibly be less chance of leakage!!

D beatty · Mar 21, 2017

If you don't have a TA use 90 W gar oil and if you do use the Hy-trans.

Dick2 · Mar 22, 2017

If you look inside the case of the rear end of an M, you will see small troughs cast into the sides of the case. Those troughs were designed to carry lubricant forward to the bearings and gears in the front of the case. If you put too heavy lubricant in the rear end, the lubricant will just spill over the sides of the trough before it can get to the front of the case.

My Dad figured that out many years ago and replaced the lubricant with a lighter grade so it would flow in the winter time. It made a bit more noise, but there were no bearing or gear failures that those tractors were known for back in those days.

BarnyardEngineering · Mar 22, 2017

Since when were M's known for bearing and gear failures?

The manual calls for 90 gear lube. That's what I put in mine.

Janicholson · Mar 22, 2017

Transmission lubricants (and modern engine oils as well) have high pressure gear lubrication ability so that isn't an issue. The 30-90 is a good choice. and will be just what is needed. Jim

Leroy · Mar 22, 2017

Bryce, that 80W-90 is what I would use, Same thing I used in the A & B John Deers that orignally called for 140 weight and back when I still had the Farmall H think we used the straight 90 as the 140 would not flow even in summer but Then when we had the 1941 H (1949 to 1984) multi weight was not avaible. The Deere books called for 140 untill 1947 when they went to calling for 90 weight. As they found out the heavier was not working as it should. The newer tractors that call for the lighter oil are machined to different spects. The same as you putting the 5-30 called for in some newer cars into a 1940's car they were machined loosed and you would not get oil preasure and you would burn out a bearing because of lack of lube. And I am now 73 and was raised with 1940's cars and tractors. Newest tractor was a 1968 model.

Dick2 · Mar 22, 2017

In the late 40's and 50's farmers were using their H's and M's for chore tractors in the cold weather in ND. The bull gears were just cutting a path through the stiff lube instead of throwing the lube up into the trough. If any stiff lube made it into the troughs, it wouldn't flow forward, it would just fall out of the trough.

I don't remember the exact lube weights after this many years, but I do remember helping work on a couple neighbor's M's.

What To Use In SuperM Rear End?

Bryce Frazier

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Goose

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onefarmer

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NEKS

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VicS

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ss55

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the tractor vet

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the tractor vet

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gene bender

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matthies

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Bryce Frazier

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D beatty

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Dick2

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BarnyardEngineering

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Janicholson

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Leroy

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Dick2

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