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Transmission Fluid - Farmall M

B

Binderson

Member
I am planning to check the level of my transmission fluid on the M. I believe to check the fluid there is a square plug to undo on the left side. If I wanted to drain all the fluid I would open the square plug on the back underneath the PTO. If I need to add fluid it's near the brake pedal somewhat where I'd put my feet, is that right?

I have never done this before but I believe that is where I'd access everything. Is that correct? If it doesn't come out the hole on the side to check the level and I need to add more. How do I know which weight to use? Does it matter if 2 weights are put in there?

Thanks in advance!
 
Do not use Hy-Tran. Those gears and
bearings were designed for 90/140. You
might want to loosen the drain plug and
carefully drain water off the bottom of
the housing. Condensation & seepage
through the inset bolts on the housing
cover allow water to enter the housing.
You will be surprised how much water you
will get out of there. You will probably
need something larger than an plastic ice
cream bucket.
 
I think there is another drain plug in front of the transmission also but would have to look to be sure. The plug to add oil is the plug you see on the platform by the gear shifter. A 3/4 drive socket will
work to turn it. I put tephon tape on my plug when I put it back. Its just a pipe plug and since my tractor sits outside all the time water can leak through it. I have 90 wt oil in mine.
 
eas your mind, no issue. All plugs underneath need to be removed from the rear forward it is probably 3. If you want to drain the Liftall hydraulic pump, its plug in in that casting
sticking down with "key Hole" openings in it, rearward of the engine oil pan. The casting is part of the pump reservoir, and has hydraulic oil (or some thing) in it not related to the trans
and final drives. The oil can be 90wt gear oil, or 85-90 gear oil, or 85-120 gear oil (unless you use the tractor where it gets 20 below, which gets very stiff to shift)
The three drains are needed because there are three chambers that connect (above the bottom) so they all fill when the oil is poured in. The fill plug is as you describe, as is the check
plug. Jim
 
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