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Case Tractors Discussion Forum
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DC transmission noise

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IA Roy

11-22-2005 18:51:14




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I have a 51 DC3. The transmission is quiet enough under load, but when going downhill or backing off on the throttle in road gear, there is a ratcheting clattering noise. Any ideas? I had the transmission top off some time back and didn't see anything apparently wrong.




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J.Jansen

12-06-2005 09:42:42




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 Re: DC transmission noise in reply to IA Roy, 11-22-2005 18:51:14  
O.K. I only go to one or two shows a year but hate the smile of the FARMALL guys when they hear my transm. . Will open the gearbox again and check carefully. A test run without pulley is easy made.
My DC is at the moment with the engine open because noise in that area ,found cam followers loose in their bores, Have to make up new cam followers before testing the transmission is possible.



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IA Roy

12-05-2005 04:57:46




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 Re: DC transmission noise in reply to IA Roy, 11-22-2005 18:51:14  
I believe I adjusted the chains correctly. I put in 80W-90 gear lube in it I think. It has been nearly 2 years since I did this, so my memory is a little fuzzy. I don't think the noise changed any after I tightened the chains and the fluid.
I only have 2 acres and don't use it for much, a little loader work, so I probably only put 2 to 3 hours a year on it, so it is not something I worry a lot about.

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J.Jansen

12-04-2005 07:35:02




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 Re: DC transmission noise in reply to IA Roy, 11-22-2005 18:51:14  
Have DC3 1945 with same problem ,am sure that chains are tightened correct. There is lot of wear on top splined axle that runs in differential gear.
Already changed oil to sae 140. When driving from start noise is not to bad but after approx. 10 minutes it is back.Anyone familiar with this one.
Can noise come from belt pulley as later DC's have special pulley arrangment with rubber vibe dampers and standard D's solid fitted pulley .My DC has solid one.

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IA Roy

11-23-2005 04:51:45




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 Re: DC transmission noise in reply to IA Roy, 11-22-2005 18:51:14  
I forgot to mention that I had tightened the final drive chains when I had the transmission top off. It did not help. The chains were not that loose before tightening.



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Camboted

11-23-2005 15:21:04




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 Re: DC transmission noise in reply to IA Roy, 11-23-2005 04:51:45  
Did you possibly over tighten them? There should be 1" of up and down movement to the chain when pulled between the diver and driven sprockets. If it is not the chains, then I suppose you need to look at the differential, it could be one of the spider gears is acting up, but I have never seen one go bad. What weight oil do you have in the transmission? If you have a light weight HY-Tran that can cause the noise. Try a 50-140 or something like that and see how it sounds.

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Camboted

11-22-2005 20:26:37




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 Re: DC transmission noise in reply to IA Roy, 11-22-2005 18:51:14  
Your chains need to be tightened. You really need to pay attention to this or you will eventually lock one link over a tooh and have real problems. LOL



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Camboted

11-22-2005 20:26:20




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 Re: DC transmission noise in reply to IA Roy, 11-22-2005 18:51:14  
Your chains need to be tightened. You really need to pay attention to this or you will eventually lock one link over a tooh and have real problems. LOL



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