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JD B first reduction gear

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David

11-27-2000 08:31:41




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I've just torn down my '38 unstyled B and have the crank out. After removing the clutch and first reduction gear cover. I discovered that the first reduction gear is very wobbly and has at least 1/8 in. end play. I'm assuming this is not normal. I haven't had the tractor running so I don't know how the tranny sounded. Is this likely the inner bearing gone bad or something else? How tough a fix is this to replace the bearing? I have the shop manual but wasn't really anticipating having to get too deep into the tranny case. Any advice would be appreciated.

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john

11-28-2000 13:35:13




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 Re: JD B first reduction gear in reply to David, 11-27-2000 08:31:41  
David,

I went through the entire tranny on my '49 B and replaced both the bearing on the reduction gear cover and the two on the shaft the drives it. That driving shaft has an outer bearing and an inner bearing. The inner bearing supports the splined counter shaft that has the sliding gears on it. Then at the other end of the counter shaft is another bearing that supports it. If you get a parts book you'll see how all this comes together. Anywhere along this axis could be excessive wear giving you the 1/8 play. There's a fair amount of work to do to get all of this out. Good luck.

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Ken Talatzko

11-28-2000 09:15:21




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 Re: JD B first reduction gear in reply to David, 11-27-2000 08:31:41  
David,
The outer end of the first reduction gear shaft is supported by the bearing in the cover. At this point I would inspect that outer bearing and determine wheather it needs to be replaced. Quite often this is the bearing that makes the most noise; failing due to the location and distance from lubrication (especially on poorly maintained tractors). The inner bearing on that shaft is harder to inspect and, I believe, involves alot of work. Ken

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Clyde Scott

11-28-2000 05:10:54




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 Re: JD B first reduction gear in reply to David, 11-27-2000 08:31:41  
David:
I have had experence with two of these tractors in the area you speak of.. I have replaced the small bearing in the first reduction gear cover and I have replaced the bearing in the spindel and the complete spindel. Each time the spindel is loose, Until you replace the cover, and makes noise.. My experence is that you can replace thses things and still have the same problem (if it is a problem).
Clyde Scott - Moultrie, GA.

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Todd

11-27-2000 09:26:41




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 Re: JD B first reduction gear in reply to David, 11-27-2000 08:31:41  
This is normal for old Deeres. Thats what the bearing in the first reduction gear cover helps do. Make sure the bearing in the cover is good. Had plenty like that, never had any problems.



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Edwin

11-27-2000 19:01:19




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 Re: Re: JD B first reduction gear in reply to Todd, 11-27-2000 09:26:41  
Todd,
My 50 is giving me a similar worry. I had the small reduction gear bearing cover crack on me this fall with audible knocking sounds coming from the reduction gear when I was in 4th gear in particular. I assumed that I was looking at an entire tranny tear down. Do you think I would only have to replace the bearing in the reduction gear cover to fix things?

Edwin



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Todd

11-27-2000 19:12:16




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 Re: Re: Re: JD B first reduction gear in reply to Edwin, 11-27-2000 19:01:19  
You might try that. I wish I could say yes or no, but most of my experience lies with the engine. It would be a good start though.



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