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Case Tractors Discussion Forum
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DC Transmission Gears

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L.Lamp

09-15-2005 13:05:28




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My question is, are all four speed DC transmission gears the same except for the high speed third that was an option? I have two 1950 and older gear sets and I have a 1952 with a very noisy whine in 4th gear. Can I replace both 4th speed gears and get rid of the whine? It was that way when I bought it and it will jump out of gear in 4th on a hard pull.




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Camboted

09-15-2005 16:58:22




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 Re: DC Transmission Gears in reply to L.Lamp, 09-15-2005 13:05:28  
The only transmission difference between the older tractor and the 1952, that I know of, is in the pto drive gear up in front of the main drive pinion. Otherwise, everything else should exchange. There were a couple of options on 3rd gear, but 4th should the same. Check your shifter indents and bearings as the problem could be other than the gear, also, as long as you are in there, adjust the chains. LOL!

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L.Lamp

09-15-2005 19:38:42




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 Re: DC Transmission Gears/Chains in reply to Camboted, 09-15-2005 16:58:22  
I don't think there is an easy way to adjust chains. The way I see it, when the axle housing bolts are loosened, they will forever leak oil because the gaskets will get ruined in the adjustment process. As for keeping the adjustment tight, the hydraulic sump has to be removed to get to the two bolts that draw up the slack. One bolt for eack axle. Tell me this job can be done without causing major leaks!!

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dctom

09-16-2005 16:12:03




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 Re: DC Transmission Gears/Chains in reply to L.Lamp, 09-15-2005 19:38:42  
Not a big job at all, i have done lots and never had a leak, tom



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Glenn F.

09-17-2005 17:21:57




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 Re: DC Transmission Gears/Chains in reply to dctom, 09-16-2005 16:12:03  
Boy, that sure sounds like a project to me! I've had the top off, and switched from a hand to foot clutch, so I'm familiar with that snap ring, but I have never removed the back of the transmission. Does one have to remove the hyd. pump first? If a guy sorta knows what he's doing, how long would you estimate this job taking, start to finish? Thanks, Glenn F.



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DCPULLER

09-16-2005 12:59:08




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 Re: DC Transmission Gears/Chains in reply to L.Lamp, 09-15-2005 19:38:42  
I changed the rear sprockets in my puller and put in oil in my 49. I don't think they have ever been moved before. Never leaked a drop. DCPULLER



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Glenn F.

09-15-2005 18:40:24




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 Re: DC Transmission Gears in reply to Camboted, 09-15-2005 16:58:22  
Hey Camboted: How exactly does one go about tightening the chains? I see the slots on each axle housing, but how does one get/keep the chain tight while tightening up the axle housings? Thanks, Glenn F.



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Camboted

09-15-2005 21:40:03




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 Re: DC Transmission Gears in reply to Glenn F., 09-15-2005 18:40:24  
third party image

I don't want to sound like I am lecturing you but, I suggest that you get either an IT manual or a Case DC Service manual, as they both give detailed instructions. OK,the process is to remove the rear transmission housing, this requires opening the clutch inspection plate on the bell housing and removing the snap ring on the PTO drive shaft for 1952 and newer models. Also, it is a much easier job if you take off the transmission top cover. Then losten the nuts on left and right axel housings. They are designed to slide on the gasket, but after 50+ years, anything can happen, if they tear, there is always silicon, or you can also cut a new set. Anyway, tighten the two square bolt heads on either side of the bull gears on the side of the transmission housing until there is 1" of up and down movement of the chain 1/2 way between the two sprockets. This is almost impossible to check if you don't remove the top plate.

I strongly recommend you take time to adjust the chains as I have seen several DC's with chains so loose they were wearing groves in the bottom of the transmission case.

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