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John Deere Tractors Discussion Forum
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1951 John Deere G: fan shaft gear replacement

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Jim in Florida

10-29-2005 12:46:30




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Am replacing fan shaft/ governor gear (part #F114R). Removed old gear. However, new gear (same part# and barrel depth as old gear), will not slide on shaft far enough to allow snap ring replacement. Gear touches bearing cone (pt. #JD1656R) and will not go any further. -Leads me to believe something moved when old gear was removed, but unable to tell what that would be.
Ball bearings in retainer (pt.#JD7657R) move freely as does fan shaft.
Thanks - Jim

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F-I-T

10-29-2005 12:52:46




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 Re: 1951 John Deere G: fan shaft gear replacement in reply to Jim in Florida, 10-29-2005 12:46:30  
Jim:

Is it possible that the spring pressure from the front fan slip clutch is pulling the sahft forward and pushing the tube aft so that shaft is "short"? If so, you'll have to press that gear on, and install the snap ring while it is compressed. Maybe I'm not seeing it correctly, but tha's where I would look.

Frank



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Jim in Florida

10-30-2005 06:39:29




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 Re: 1951 John Deere G: fan shaft gear replacement in reply to F-I-T, 10-29-2005 12:52:46  
Frank-
If I can locate a press sufficiently tall -or construct something myself- is the vertical pressure positioned only on the gear? If so, would the gear compress the front end spring assembly? Thanks
Jim



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F-I-T

10-30-2005 08:53:45




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 Re: 1951 John Deere G: fan shaft gear replacement in reply to Jim in Florida, 10-30-2005 06:39:29  
third party image

Jim:

Yes, I think so. I've attached an exploded parts diagram. I would think that you could build something out of pipe, angle iron, and threaded rods that would pull the fan shaft down, towards the tube, and this should shift the shaft (?!?) rearward. You'll just have to be sure you can get the snap ring in place while it is compressed. The spring pressure is not all that great. On power steering models which have a very short shaft through a pump, I have used the tractor drawbar frame and a floor jack to install the fan and spring. You might get by with a 2x4 or two to form a pressing frame.

Frank

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