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Farmall & IHC Tractors Discussion Forum

Farmall M - Pto Shaft Seal width

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08-11-2020 15:04:34

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Hi all,

Got the PTO back today, neighbor welded the linkage plate back on and looks good.

After looking at the PTO, decided to replace the shaft seal as well - already have the gaskets, linkage sesl etc and figured might as well do it and be done with it - the seal looked pretty bad anyway.

Anywho, so to the question.

The part # is 45702D

Looks like accoding to CNH, the new part # is 358812R91

So, question is, I see the 45708D is only .3 inches wide (so would I need 2 or 3 of this seal?

Seems 3 would be perfect as .312 (x3) = .936, and the old seal is 1" wide, but YT says to use 2.

2nd question, is 358812R91 the same width as 45708D? Cannot find the width when searching online, only seem to show the inner and outer diameters.

So to recap:

Can someone tell me the width of 358812R91?

And depending on ordering 45708D or 358812R91 - would I use 2 or 3 as replacment?

Here is a pic of the old seal - are these captive or do they remove from this sleeve?

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08-11-2020 20:54:22

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 Re: Farmall M - Pto Shaft Seal width in reply to ChampagneNBeer, 08-11-2020 15:04:34  

So I measured and the slop is due to whomever broke and welded the linkage in the past.

Instead of welding down onto the linkage shaft, they welded it on the tab and it has created a gap that isn't being taken up - see pic.

So, I have been pondering what I can do to fill in that gap so the linkage is tighter to the housing.

I think the easiest is to add additional washers to take the gap up, but it is a sloppy solution and was hoping someone might have a better idea.


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08-11-2020 21:04:07

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 Re: Farmall M - Pto Shaft Seal width in reply to ChampagneNBeer, 08-11-2020 20:54:22  
Since it is apart,do it 'right'. either grind the weld loose and reweld it in the correct place,or get a complete replacement part from a junk/salvage tractor.

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08-11-2020 22:52:16

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 Re: Farmall M - Pto Shaft Seal width in reply to DeltaSteve, 08-11-2020 21:04:07  
Hi Delta,

I was afraid someone was going to say that.

Guess I will take apart and try welding correctly...

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08-11-2020 15:11:26

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 Re: Farmall M - Pto Shaft Seal width in reply to ChampagneNBeer, 08-11-2020 15:04:34  
I installed 2 seals on my 1940 M. Drove the first one all the way in, and the second seal is flush with the rear of the housing. Grease is packed in between the 2 seals.

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08-11-2020 17:25:27

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 Re: Farmall M - Pto Shaft Seal width in reply to rustyfarmall, 08-11-2020 15:11:26  
Can do - thanks Rusty.

For the linkage seal - see pic - there seems to be an aweful lot of play in the linkage.

I haven't installed the new seal, as you can see, but put it together for the image.

The parts catalog only shows the linkage and the seal.

Dunno if the washer is original or should be there but was there when disassembled.

I know when I screw in the ball/spring in it will close up a bit, but that washer doesn't even fit the linkage properly.

Should I get a different washer? Add a loose bushing between the linkage and the washer to close that gap a bit?

Not worry about the slop?


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08-11-2020 15:51:07

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 Re: Farmall M - Pto Shaft Seal width in reply to rustyfarmall, 08-11-2020 15:11:26  
Perfect answer. Make sure at least one of the seals rides where the original did not. Polish the shaft (roundy round, not long ways) with at least 400 grit paper. Jim

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