Go BottomBroken Gear in Transmission
 | kthompson
Join Date: Oct 2005 Posts: 5275 South Carolina 
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2006-04-21 128102
My mid size Kubota (M6800) with manual trans is torn down in tractor shop with broken grear in tranmission. A tooth broke off of a gear. Made a loud knocking noise in transmission.
WHen I asked mechanic what would cause this he gave me some options...now fitted what I was doing. I had been operating tractor for several hours disking in clear fields and no shock loads.
Any ideas what could have caused such. Yes tractor has had shock loads over the 511 hours on it of pulling stumps with and getting out of bogs but not in last 100 or more hours.
Thanks,
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 | Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2006-04-21 128113
Gears are machined, hardened and then ground. The hardedning has to be correct and uniform. If it is too hard it can be brittle and split. Too soft and the gear will wear prematurely.
It is likely a flaw in the metal that was not found in the quality control. You should get the gear they remove and look at it. You can tell by the grain structure at the break area. ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2006-04-22 128126
While playing with my truck a couple of months ago while mildly stuck I was just running between drive and reverse, I caused damage to a part in my transmission. Didn't act up for over a week after. After looking at it I could see where Dodge could have trouble with a plow truck if the operator was not extremely cautious. Big difference in the cost of repair compared to a rebuilt from anyone. We have quite a few 6800 Kubotas out and have not had any problems but there is a first for everything. ....
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| kthompson
Join Date: Oct 2005 Posts: 5275 South Carolina
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2006-05-05 128899
Well it is back home. A few minutes of light load and using I think all gears in forward it seems fine. I think Peters was correct. The shop said they found no large piece of metal nor could give any reason for gears to have failed like they did due to use. My guess is one caused the other two.
The transmission did have a whine in it and always had in one low range gear at high engine rpm. It is my guess that was where it began. So if it whines, get it checked is my thought WHILE STILL IN WARRANTY.
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2006-05-05 128906
Sound like one gear missed hardening. They should have caught it in grinding. But I am sure a lot of this is done on an automated machines now. ....
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| kthompson
Join Date: Oct 2005 Posts: 5275 South Carolina
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2006-05-05 128921
Peters,
I would suspect you are right on both parts about the grinding.
Thank each of you for your input. ....
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