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Sherman

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Roger

09-23-2001 10:59:57




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I have a 44 2N with a step up sherman. Straight thru it run very quiet but step up it sounds like a very bad bearing. I took it apart and every thing looks good. Are these typically noisy or do you think I am hearing gear noise. I was hoping the trouble would be obvious when I got into it but it wasn't.
Thanks for your help




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Earl(MT)

09-23-2001 18:55:58




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 Re: sherman in reply to Roger, 09-23-2001 10:59:57  
Roger:
I too have a 1944 2N SN:157269, it too has a step up Sherman, and it too makes a different sound when you have her in high range and third gear but boy doe she get down the road, like Zane said it is just one of those things you live with. earl



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ZANE

09-23-2001 15:40:14




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 Re: sherman in reply to Roger, 09-23-2001 10:59:57  
The 9N and 2N transmission is a spur gear transmission. This means that the teeth on the gears are straight across and not at an angle as in the helical geared 8N etc. The faster the gears go the more noise they make on these old spur geared transmissions. This is because the teeth of the gears have a tendency to momentarily loose contact between the next tooth coming up and this causes a clicking in the sound which is multiplied the faster is goes. This is the main reason that the helical gear was later invented. The helical gear is in constant mesh and does not produce these noisey transmissions.

Drive it!

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Ultradog MN

09-23-2001 13:19:11




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 Re: sherman in reply to Roger, 09-23-2001 10:59:57  
here's another link from the archives



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Ultradog MN

09-23-2001 13:13:48




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 Re: sherman in reply to Roger, 09-23-2001 10:59:57  
I have a 46 2n with the same step up sherman
and it is also noisy as all get out.
I have read that it is pretty common with these units. But I think I read that it is usually in the bearings and can be fixed by replacing them.
below is a link I bookmarked from this site that pertains to noisy Shermans.
You can also do a search in the archives and find out more info there. I haven't pulled mine apart yet so I can't give you more specifics.
good luck

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