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Farmall & IHC Tractors Discussion Forum
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M Transmission Input Shaft Seal

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Wicksfield

03-24-2006 05:53:47




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I have a job to do on the M that I have been putting off for several years. The transmission input shaft seal drips which I've been using a bucket under it. I know I have to pull the hydraulic pump and remove the 4 bolt bearing block and seal that supports the transmission input shaft.
Question: When I remove the bearing block, will the transmission shaft drop allowing the shift mechanisms, all the bearings, and all gears, to end up in the belly of the transmission housing? Or, will it stay in the same postion and behave itself?

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Haas

03-24-2006 14:03:48




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 Re: M Transmission Input Shaft Seal in reply to Wicksfield, 03-24-2006 05:53:47  
The input shaft and gear is mounted in a holder and the shaft is supported by two bearings. The seal is in a separate seal holder that bolts to the input shaft bearing holder assembly. The seal holder is held on with 4 bolts. The input shaft holder is bolted to the transmission housing with 6 or 8 bolts. If you just take off the seal holder, there is no way the input shaft can fall down. You will have some "fun" down under there. To get the seal holder out, you will have to disconnect the main drive shaft coupling. Be prepared to replace the rubber washers and the metal cup washers in the coupling, as they are likely bad. Getting the coupling off the transmission input shaft may be a chore. I don't know if it will come out without taking out the clutch shaft or not. The seal runs on the coupling, not directly on the shaft, so the coupling must come off before you can take off the seal holder. I've not done an M, but on a Super H, I had to use a puller to get the drive coupling off. I've seen some say that these will come off with a pry bar once the retainer bolt and washer are out, but I had no such luck. I had the input shaft bearing assembly out anyway, so using the puller was no big deal.

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Bob M

03-24-2006 06:02:43




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 Re: M Transmission Input Shaft Seal in reply to Wicksfield, 03-24-2006 05:53:47  
Not to worry! The tranny input shaft remains firmly in postion when you remove the front bearing/seal retainer. (The input shaft supported by two more bearings inside the transmission...)



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