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Discussion Forum

G output shaft bearing

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05-27-2003 08:25:09

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There is considerable wobble in the transmission output shaft that runs thru the throw-out bearing housing on my G tractor. Is this normal, or should I replace the bearing? I am told I will have to split the clutch (bellhousing) unit from the transmission case. Is this a difficult job, and is the bearing the source of the wobble? Thanks for any help...PS..The engine has been rebuilt and off, so now would be the time to do it if necessary..Mark

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Plant Doctor

05-28-2003 05:32:19

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 Re: G output shaft bearing in reply to Mark, 05-27-2003 08:25:09  
Mark: If you have the engine out of the tractor, now is the time to replace that input bearing. Separating the clutch housing from the trans housing isn't that big of a deal, just takes a little time. What are you calling "considerable wobble." There is always some normal side to side play at the end of the input shaft. What you want to check for is side to side or up and down play in the bearing itself. If you can move the entire shaft up and down, not just the end of the shaft, but the entire shaft, then take the time now and install a new bearing. If you are just getting a 1/4 to 3/8" side to side wobble on the end of the shaft, that is normal and nothing to worry about.

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Bill Hires

05-28-2003 05:31:00

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 Re: G output shaft bearing in reply to Mark, 05-27-2003 08:25:09  
The main shaft has three sets of roller bearings, if they are damaged it could cause a shaft wobble. To remove and repair this shaft requires removing the transmission case from the tractor. It would help if you had an Allis Chalmers I & T shop Manual AC-11.

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Plant Doctor

05-28-2003 05:49:51

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 Re: Re: G output shaft bearing in reply to Bill Hires, 05-28-2003 05:31:00  
Bill: The output shaft only has one ball bearing. This bearing supports the shaft in the clutch housing and takes the side thrust from the drive gears. The pilot bearing in the flywheel support the other end of the shaft and handles the outter thrust. The main shaft bearings have little to do with any wobble at the output shaft.

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Bill Hires

05-28-2003 17:49:32

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 Re: Re: Re: G output shaft bearing in reply to Plant Doctor, 05-28-2003 05:49:51  
You are correct. I would be sure the main shaft end play is zero and free rolling, if not shims will have to be added, or removed between the case and bearing retainer.

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