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Allis B Rear end Oil

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Trevor

04-01-2002 08:00:11

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What weight and type of oil should I use in the rear end of an Allis B? I am restoring a B and it appears to have water in the rear end. Plus I would like to change all the fluids as part of my restoration.

Also how much oil does the rear end hold?

P.S. My next project is a CA can I use the same oil in it's rear end as well?

Thanks
Trevor
Picton, Ontario Canada

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steve

04-01-2002 19:46:41

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Re: Allis B Rear end Oil in reply to Trevor, 04-01-2002 08:00:11

Trevor, lets make sure we are talking about the right case. When you say you had water in "the rear end" i am assuming you mean the differential case behind the transmission?? if so, the water came from rain around the transmission lever. the transmission case, the differential behind it, and the PTO housing behind it are all connected internal. you fill them thru the transmission fill plug on the left side by your foot. it takes about 2 gallons and should be a good trans-hydraulic fluid, 20wt. you can get this at the farm store, or wal mart.
There are three plugs to drain the system, one under the transmission, one under the differential and one under the PTO. you are draining the same oil, at three levels. If you are talking about the final drives (the little tin pan) at the bottom of the drop box, setting inside the rear wheels, then yes you need 80 or 90 wt gear lube in them. you must remove the pans and clean out the old oil. after reassembly you add oil thru the 1/2 inch pipe plug. i havnt seen a final drive with water in it too often. last of all, yes you can do exactly the same thing with the CA.

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Brian G. NY

04-01-2002 20:38:51

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Re: Re: Allis B Rear end Oil in reply to steve, 04-01-2002 19:46:41

I believe the B, C & CA have only two drain plugs; one under the tranny and one under the PTO hsng., unlike the WDs & WD-45s which have 3 plugs (5, if you drain the hydraulic system). The Bs & Cs hold 7 Qts with the PTO option, and the CA holds 8-3/4 Qts.

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Bryan Smith

04-01-2002 08:34:33

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Re: Allis B Rear end Oil in reply to Trevor, 04-01-2002 08:00:11

Trevor,

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.

Link

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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!

Link

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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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Greaseman

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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Rick (NC)

04-01-2002 08:33:32

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Re: Allis B Rear end Oil in reply to Trevor, 04-01-2002 08:00:11

I think that the manual says GO-80 in the winter and GO-140 in the summer. Here in NC I run 140 all year. Never had any problems. Each side holds about 1 - 1 1/2 pints as I recall.

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