Gear oil amount...

BigTone · Jul 12, 2013

The M calls for 13 gallons of gear oil, there was only about 5 gallons in it when I drained it out. I replaced it with 80w90, I put 10 gallons in, should I put the last 3 gallons in or leave it at 10? I was afraid that I didn't get all the old oil out and didn't want to over fill it...can you over fill it? thanks, Anthony

Janicholson · Jul 12, 2013

Assuming that you drained all three plugs from the bottom, there should be room for 13.
In front of the left brake drum, near the clutch actuating rod there is a pipe plug. The oil level is correct when within 1/2 inch of that plug, or running out a little. Jim

rustyfarmall · Jul 12, 2013

I removed all 3 plugs from my '40 M, let it set and drain for about 3 days, and 11 gallons was all I could get back in it.

BigTone · Jul 12, 2013

I know about the large plug under the pto, where are the other 2 drain plugs?

D Slater · Jul 12, 2013

Only 2 transmission drain plugs on a M. Other one is a smaller one at the front of the transmission housing. Fill to the bottom of the check level plug on the left side of the transmission.

Gear oil amount...

BigTone

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Janicholson

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rustyfarmall

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BigTone

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D Slater

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