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Farmall & IHC Tractors Discussion Forum
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transmission noise

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sven

12-18-2005 12:58:42




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We recently started restoring on a farmall 100. The tractor was all original and showed very little wear, probably a fairly low hour tractor. However, the transmission whined a bit more then we thought it should. After taking the tranmission and differeintal apart, we found that all of the bearings were in excellent shape, with no play at all. To try and correct the noise, we used the shims at the differntial to move the ring gear closer to the bevel gear that comes from the transmission. This eliminated the play that exsisted between these two gears. However, after putting everything back together and running the tractor, the transmission seems to make more noise then before, reverse being the worst. Does anyone one exactly were this noise is coming from, and possibly how to correct it. Thanks

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Andy Martin

12-19-2005 06:06:23




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 Re: transmission noise in reply to sven, 12-18-2005 12:58:42  
The key here is recognizing when you said "it whined more than you thought it should", you were mistaken. Some of them whine a LOT, so your's probably doesn't whine that much.

Enjoy the old tractor for what it is. Don't restore it, just paint it up. It's got many years of life left in it.



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CNKS

12-18-2005 16:35:26




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 Re: transmission noise in reply to sven, 12-18-2005 12:58:42  
Put the gears back like they were -- you are doing more harm than good as you are starting a whole new wear pattern. Those transmissions are inherently noisy, the noise does not hurt a thing, it is a characteristic of that tractor.



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lee

12-18-2005 13:25:31




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 Re: transmission noise in reply to sven, 12-18-2005 12:58:42  
Re-shimming a ring and pinion gear set after it"s been in service a while is probably not a good idea. I did same once and although no problems developed in a non-working tractor I have thought about it since so this tractor I got apart right now will be shimmed back to where it was even though backlash is slightly greater than spec. Reasoning I"m using now is these gear sets wear in together so re-shimming and putting worn gears back to backlash spec is liable to create more noise in the least and possibly gear set failure in a working tractor. Re-shimming moves the contact patches so worn gears will now have incorrect smaller high stresssed contact patch areas because the wear patterns are mis-aligned
and high areas are in contact. I think better to let them run where they have been running with more backlash and if backlash is just too excessive to where it"s a possible problem they need to be replaced altogether.

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Randy-IA

12-18-2005 13:19:35




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 Re: transmission noise in reply to sven, 12-18-2005 12:58:42  
Hi , I am no expert on gears but have alway's been told that the tighter the gear's are the more they whine . I think you should not have moved gear's that already have run-in with each other . The wear pattern is already made so you may have to live with the noise all thing's considered . Other's might ask me to eat my word's which I will do willingly if I am wrong which I frequently am with tractor technology :) . If it were a truck I believe this would hold true . But since tractor's run at such a slower rpm I can't say for sure . My transmission on my M makes noise also . Don't know what it is yet because it's coooolllldddd outside and no indoor place to work on it so I'll have to wait for warm day's or spring to find out . Good luck and take care ...Randy

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Janicholson

12-18-2005 13:10:40




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 Re: transmission noise in reply to sven, 12-18-2005 12:58:42  
Yes!!
The shimming of the ring and pinion is not a task to attempt without measuring tools and some knowledge/experience.
spiral bevel gears depend on two specific adjustments. One is ring gear backlash, the other is depth of engagement.
Backlash and engagement both contribute to tooth pressure patterns.
I do not know the specifications, but the books do.
The pressure pattern is the key to low noise and long life.
It is checked by using marking die on the ring gear teeth in three places. Then putting the system under load by applying the brakes moderately while turning the pinion past these markers. The wipe pattern should be centered in the flank of the teeth and nice and wide.
If a good text is reviewed for the looks of this wipe pattern, success will be yours.
Do not operate this tractor. Its ring and pinion will be destroyed. Good luck.
JimN

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Roger46

12-19-2005 18:09:42




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 Re: transmission noise in reply to Janicholson, 12-18-2005 13:10:40  
These are good words of wisdom for me also in the posting below this one on setting the pinion gear from scratch with a different transmission case. Roger



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Roger46

12-19-2005 18:13:58




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 Re: transmission noise in reply to Roger46, 12-19-2005 18:09:42  
Sorry, I meant up above on the posting called "Differential Pinion Gear Adjustment". Roger



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