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Discussion Forum

Re: Allis B Rear end Oil

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Bryan Smith

04-01-2002 08:34:33

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Check out my site (below) - it has a specs page as well as a page for oil types and capacities for both the B and the CA. Hope that helps.

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Brian G. NY

04-01-2002 13:18:54

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 Re: Re: Allis B Rear end Oil in reply to Bryan Smith, 04-01-2002 08:34:33  
Bryan, I could never understand the great disparity between the recommended fluids for the final drives in A-C tractors. Most (including the "C" according to my manual) call for 140 Summer & 90 Winter. The "WC" even calls for 250 Summer & 140 Winter. The "B" and "CA" manuals, on the other hand call for 20W "at all times". 20W oil in the final drives seems way too light to me. If I had a "B" or a "CA", you can bet I would be running 90/140 year round in my final drives. BTW, you have a great website and those of us who are regulars here probably have your site "earmarked" for ready reference; I know I do. Sorry Trevor, for drifting away from your original question!!

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Bryan Smith

04-01-2002 13:30:30

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 Re: Re: Re: Allis B Rear end Oil in reply to Brian G. NY, 04-01-2002 13:18:54  
Many thanks for the kind comments, Brian. I agree on the final drive oil specs. We have been running 90w gear oil in the final drives on all our AC's for about 50 years now. In all that time we lost one final drive bearing on a CA and I'm not sure it wasn't a faulty bearing, but then again that happened on a 1951 CA in about 1985, so go figure!

If you look on the oil viscosity comparison chart on one of the links on my site (included below - the chart is some way down the page) it shows not much difference between 80w gear oil and 20w engine oil. Different designations, different applications, but similar viscosities. I thought that was really interesting. Mine all have 90w in the final drives and that's what I'll stay with I think - it works here in SC. *But* that's not in the manuals or the new recommendations from AGCO and as you guessed I'm posting official recommendations and not what works for me, since it may *not* work in another climate!

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Brian G. NY

04-01-2002 20:31:56

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 Re: Re: Re: Re: Allis B Rear end Oil in reply to Bryan Smith, 04-01-2002 13:30:30  
Interesting stuff. Apparently gear oil viscosity is affected greatly by heat. I remember using 50W oil in my motorcycle tranny. It looks as though at high temps it's as good as 90 wt. gear oil. 50 wt. motor oil was also recommended in some of the B-W HD 3 speed W/O.D. trannys of the 60s probably to provide optimum lube to the planetary gears.

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04-01-2002 14:36:34

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 Re: Re: Re: Re: Allis B Rear end Oil in reply to Bryan Smith, 04-01-2002 13:30:30  
I have always ran 80 or 90 wt. Gear oil in the final drives of all my machinery. When it comes to the "B" machine which is what I also have, you have to pull 3 plugs at the bottom of the final drives to get the old fluids out; I would also recomend you unbolting the final drive pans which are beside the rear wheels and clobber them with a 2X4 or something to get the fluids out of them also. (when I redid my fluids there was about 3 quarts of water in the final drive and a pint in each of the lower pans).

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