Transmission imput shaft?

tmath677

New User
Hi all, thanks for adding me to the forum.
I have a 1949 8n that had a transmission failure 30 years ago. It was replaced with a rebuilt from Central Tractor and had functioned well until a few years ago. The tractor is lightly used around the property and not terribly abused since the transmission was changed. A few years back, it started making a noise that I thought was the throw-out bearing because the noise was more noticeable when the clutch was disengaged. A few weeks back I was using the tractor and the noise went away, along with any power to or through the transmission. No BANG!, no snap, no grinding, just loss of input. I have been looking for a replacement trans but have decided to wait until I can split the tractor to make sure of what I need. Anyone have any experience with this kind of failure?

Thanks,
TM
 
(quoted from post at 06:52:31 08/11/22) Hi all, thanks for adding me to the forum.
I have a 1949 8n that had a transmission failure 30 years ago. It was replaced with a rebuilt from Central Tractor and had functioned well until a few years ago. The tractor is lightly used around the property and not terribly abused since the transmission was changed. A few years back, it started making a noise that I thought was the throw-out bearing because the noise was more noticeable when the clutch was disengaged. A few weeks back I was using the tractor and the noise went away, along with any power to or through the transmission. No BANG!, no snap, no grinding, just loss of input. I have been looking for a replacement trans but have decided to wait until I can split the tractor to make sure of what I need. Anyone have any experience with this kind of failure?

Thanks,
TM
es wait to buy any parts. You might check the trans output shaft before splitting, remove round side plate on r/h side and check the shaft. they have been known to fail.
 
FYI
Output shaft of Transmission on my 2-N..
Bob..
cvphoto132923.jpg
 
Welcome to the forum tmath677. I think that output shaft can be checked without removing anything. Engage the PTO, and with the transmission an any gear try to turn the PTO shaft. If you can't then output shaft is O.K.
 
Thanks for your responses. My problem is the INPUT, not output. I guess I spelled it wrong. I checked the output shaft is still engaging with the transmission by your suggestion.
As I said initially, it sounded like it was a throw out bearing. The tractor was split and had a mild restoration 30 years ago when the trans was changed. I couldn't imagine that we did not change the clutch and throw-out bearing.
When whatever it is failed, the noise simply went away. No catastrophic bang or grinding, just loss of input through the trans. because of the length of the input shaft on non-Sherman tractors, I thought maybe the input could have sheared.
Has anyone heard of this? I should be able to get the tractor split in the next week or so.

Thanks!
 

I dont have a silver bullet you will have to look for the issue.

The transmission couple is not a solid tube its made of three pieces. I know we have talked about this before I think TOH explained how they were assembled. They can separate at one of the two welds and look perfect.

If you are satisfied the issue is toward the front of the transmission why not pull the sifter cover off. Beware of the detent spring at the rear of the cover jumping out.
 
(quoted from post at 09:48:26 08/14/22) ..... because of the length of the input shaft on non-Sherman tractors, I thought maybe the input could have sheared.
Has anyone heard of this
I never have, not ever. Been around tractors all my life and working on them almost forever.

Not saying it couldn't happen, stranger things have.

Sounds more like a catastrophic clutch failure. PPA or disc
 

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