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Funky brown thick tranny fluid

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Preachermannn

04-02-2005 06:31:41




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Could someone tell me what's happening here. Yesterday, I drained the rear-end on my father's old Case D tractor. The tractor was made circa 1950. I think the gear oil in the rear end comes from 1950. It is very, very, very think and heavy AND looks like milk chocolate. It doesn't smell bad like most rear end/manuel tranny fluid does. But it is in no way the amber/clear color. Does anyone have any idea as to what happened to this fluid over the years? I'm guessing when it was new, it must have been a 90 weight gear oil. Now, it has the consistency of warm tar. Any ideas?
The tractor is circa 1950, Case Model D.O.with no three point hitch. Oh, by the way, if anyone needs any antique gear oil, I have 15 gallons

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dctom

04-02-2005 07:53:01




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 Re: Funky brown thick tranny fluid in reply to Preachermannn, 04-02-2005 06:31:41  
been in there for 55 years, it has gotten water in it to make it milky, original it was 140 gear oil. today we use 80-90 gear lube tom



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Preachermannn

04-02-2005 08:05:12




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 Re: Funky brown thick tranny fluid in reply to dctom, 04-02-2005 07:53:01  
Thanks for the reply DCTom. Do you have an idea on what I can do to clean out this rear-end. I'm afraid that if I put new lube in there it will be just as dirty in a few weeks of use. Secondly, do you think it would be okay to use 85W140 gear oil, or would it be better to use the 80W90? I live in Florida so cold weather is not a problem. If straight 140 was original, can I still find this stuff anywhere? Thanks - Glenn

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DKase

04-02-2005 10:01:03




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 Re: Funky brown thick tranny fluid in reply to Preachermannn, 04-02-2005 08:05:12  
Dump about 8 gallons of kerosene or diesel fuel in the rear end and run it around the yard for 10 minutes or so. Should give it a good flush. There have been times when I had a really dirty one that I flushed it several times. Good Luck DK



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Doc Larry

04-03-2005 17:19:17




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 Re: Funky brown thick tranny fluid in reply to DKase, 04-02-2005 10:01:03  
When I flushed the 50 year old God-awful crud out of my 401 by mixing in about 5 gallons of diesel it leaked like a seive until I drained and refilled with 80W-90. Then it didn"t leak at all. I"m no lubricant expert but my understanding is that the multi-viscosity gear lubes are much better quality in terms of additives to improve lubrication and keepseals soft than the straight weight gear lube.

As far as seals go, most if not all of the original seals on my 1955 401 are leather, replacements will be neoprene I suppose.....

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Jim nuhfer

04-02-2005 09:02:13




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 Re: Funky brown thick tranny fluid in reply to Preachermannn, 04-02-2005 08:05:12  
I would use SAE 140 gear oil. From 1st hand experience, I changed rear end gear oil in two of my 50’s era “Green” tractors to the new 85W140 type with all the new additives. It only took a few weeks before I had axle leaks, gaskets leaking gear oil, and etc etc. Since I am also in a warm climate, I went back to the 140 gear oil. However, I still had to change out several gaskets, and seals to stop the leaking.

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Larry W.

04-03-2005 11:08:14




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 Hey Jim???? in reply to Jim nuhfer, 04-02-2005 09:02:13  
Jim, where do you get 140 from now days, I cant find any real heavy oils anywhere??



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Mathias NY

04-02-2005 12:59:12




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 Re: Funky brown thick tranny fluid in reply to Jim nuhfer, 04-02-2005 09:02:13  
I am an engineer for a company that produces Teflon based seals for companies like Caterpillar and John Deere.

Although we haven't been able to prove it, we have had a number of seal failures around oils that use Silicone as an anti-foaming additive.
The Silicone may affect the Teflon seals more than the older rubber seals.

I am now very careful over what oil I use. In the old tractors I won't use anything that is a multi-weight.

Anyway, that is just my 2 cents....

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