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Farmall & IHC Tractors Discussion Forum
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Rear End Fluid

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Old Guy

11-09-2003 20:21:45




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I just drained the fluid in the rear end of my F-20. It took nearly a day to drain cause it was thicker than molasses. Is this the way it was meant to be or what? It is recommended to clean it out before refilling? What weight do I use?




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caseman-d

11-10-2003 18:41:59




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 Re: Rear End Fluid in reply to Old Guy, 11-09-2003 20:21:45  
You might flush it put with some diesel fuel, I would recomend 80/90w gear oil. 80/90 will work great in summer and winter. 85/140 gear oil is also available but unless your going to tow it behind your pickup it's never going to get above 80/90 operating temp. Besides 80/90 weight is whats used in most pickup rear ends.
caseman-d



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Fred Milner

11-10-2003 15:48:23




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 Re: Rear End Fluid in reply to Old Guy, 11-09-2003 20:21:45  
The book calls for SAE 160 summer and SAE 90 winter. I think you can still get SAE 140 so I would use that. A lot of times water gets in the transmission and over time it will make the oil very thick. I have a couple of tractors that had very thick oil in them with a little water also. I got them cleaned out but it was hard to get all the gunk out of the tight spots. I used diesel fuel but it was still tough. When I took the plugs out the first time the oil was like cold molasses or thicker. Good luck with it.

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Slappy

11-10-2003 03:54:03




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 Re: Rear End Fluid in reply to Old Guy, 11-09-2003 20:21:45  
Allen has a good idea. I suppose someone used a different gear oil, but I can't imagine it takes heavier than 90 wt (others will know). One thing though after you clean all the old gunk out you may find some leaky seals.



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Allan

11-10-2003 04:06:58




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 Re: Re: Rear End Fluid in reply to Slappy, 11-10-2003 03:54:03  
Hi Slappy,

I failed to add:

Oils are designed to "suspend" foreign material.

In other words, dirt and the like will float and circulate with the oil until that oil is completely saturated. At this point, the heavier contaminants will fall to the bottom forming the "sludge".

So what this means at the end of the day, is that an oil which has not been changed in a very long time will always be "thicker" than it was originally was due to these contaminates being mixed in with the oil.

Hope that this makes sense,

Allan

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Allan

11-10-2003 03:36:11




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 Re: Rear End Fluid in reply to Old Guy, 11-09-2003 20:21:45  
Hi,

I fill 'em up with diesel fuel and then run it around the yard for a little while to "flush" all the junk.

Then, I remove the drain plug and let it set for awhile to "drip dry".

Last step is to fill 'er up with the proper fluid; does the trick every time.

Allan



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Slowpoke

11-10-2003 10:43:46




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 Re: Re: Rear End Fluid in reply to Allan, 11-10-2003 03:36:11  
If after draining the lube, do you think that running some compressed air thru from the fill hole will blow any seals? It might force more of the fluid to exit the drain hole, especially if it's diesel.



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Allan

11-10-2003 11:57:58




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 Re: Re: Re: Rear End Fluid in reply to Slowpoke, 11-10-2003 10:43:46  
Slowpoke,

If you have the drain plug out, I don't think you could develop enough pressure in there to hurt anything....Never tried it tho.

Howerver, I just let the old gal set for a time after the diesel fuel flushing and then add the new oil, even tho it is still 'wet'.

What little residue is left is just absorbed by the new gear lube.

That diesel fuel really does a number on that old oil!

Allan

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