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John Deere Tractors Discussion Forum
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1937 AR Fan Shaft

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Junkdigger

06-10-2005 05:46:02




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As part of the restoration of my 1937 AR, I am now working on the fan shaft. It has a pulley just behind the fan, which I don't believe should be there. In the process of removing the fan I destoryed the fan clutch. My plan now is to rebuild it best I can, to look as original as possible. My question is, does anyone know why there is a clutch on the fan? When I finish rebuilding it, the friction clutch may no longer fuction. I just want to make sure I'm not over looking something, that might cause a problem.

Thanks

Michael In Kentucky

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Mike M

06-10-2005 06:57:46




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 Re: 1937 AR Fan Shaft in reply to Junkdigger, 06-10-2005 05:46:02  
The friction disks and pot metal plates and the felt and cork seals are all available new from JD. May as well fix it to work as designed.



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Junkdigger

06-14-2005 11:06:20




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 Re: 1937 AR Fan Shaft in reply to Mike M, 06-10-2005 06:57:46  
Mike,
I purchased the needed parts today from JD, for $ 18.95 in stock. I couldn"t believe it.

Thanks
Michael



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Junkdigger

06-10-2005 11:24:15




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 Re: 1937 AR Fan Shaft in reply to Mike M, 06-10-2005 06:57:46  
Mike,

I agree, I will check with JD about replacement parts.

Thanks

Michael In Kentucky



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Duane Larson

06-10-2005 06:27:18




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 Re: 1937 AR Fan Shaft in reply to Junkdigger, 06-10-2005 05:46:02  
Junkdigger,
Your AR came with a fan which used a rubber cushion between the shaft and fan. Those had a habit of the rubber letting loose from the fan hub or shaft bushing, and the fan going into the radiator. Most folks then replaced that fan with one which used disk-drive clutches, which sounds like your case. JD provided a kit to do this, and the pulley, a part of the kit, was used as a spacer since the new fan/clutch system took up less space on the fan shaft.

The cushioning effect of the rubber hub and/or the clutches is to reduce wear on the driving/driven fan gears in the governor box. If you are not concerned about this effect you do not have to replace the clutches, but will have to use proper spacers to keep tension on the fan system so the keepers on the end of the shaft will hold the fan in place. However, used clutches are easy to find and fairly cheap, and I would recommend replacing them. The system is about the same on all Waterloo tractors, so looking in most any parts book will show the parts needed.

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Junkdigger

06-10-2005 09:26:38




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 Re: 1937 AR Fan Shaft in reply to Duane Larson, 06-10-2005 06:27:18  
Duane,
In your opinion, should I leave the pulley? To me it doesn't look like it belongs, and I could replace it with a spacer. On the other hand, if JD supplied it as a repair, I guess I could learn to live with it.

Thanks

Michael In Kentucky



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Duane Larson

06-10-2005 09:59:03




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 Re: 1937 AR Fan Shaft in reply to Junkdigger, 06-10-2005 09:26:38  
Junkdigger,
I guess it's all a matter of what you think looks good, but since you asked my opinion, if I looked at your tractor and saw the rubber-hub fan had been replaced, I would expect to see a pulley there, and the adjacent spring, and ... . If I didn't see that stuff I would wonder why the fellow didn't include all parts of the kit, or didn't try to find the pulley, or ... . In other words, I would include it as part of the JD replacement kit.

The alternative is to find a good, rubber-hub fan, but I think that would be hard as about the only way to tell if they are good is to use it - and if it isn't good you are likely looking at a radiator core.

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Junkdigger

06-10-2005 11:21:40




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 Re: 1937 AR Fan Shaft in reply to Duane Larson, 06-10-2005 09:59:03  
The pulley will stay. Thanks for your input.


Michael In Kentucky

.



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fixerupper

06-10-2005 06:09:04




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 Re: 1937 AR Fan Shaft in reply to Junkdigger, 06-10-2005 05:46:02  
The clutch is probably there to absorb some of the torque from when the pistons fire. My gut instinct is to put a clutch back in.Good luck. Jim



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