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Allis Chalmers Discussion Forum
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AC B Steering Gear Problem

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Brandon P. Webe

01-04-2007 19:55:48




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Here's a followup to my posting of Dec. 23. I finally tore into the steering gear on my bastardized B/C since we've had a couple of rain days. Gotta love unpredictable Michigan winters. What I thought was a Gemmer steering gear is actually a Ross steering gear. I discovered my problem. Somehow or another, long before I took possession of it, the expansion plug has fallen out ( but is still with us miraculously), and the little ball bearings are largely missing from both the lower and upper bearing cups (which came first is anyone's guess). This in turn allows almost an inch of slop in the steering shaft. In total, I have only 8 total balls from these (which I can tell you isn't enough to fill one much less two cups). Using a micrometer, they are .311". In my I&T manual, they are listed on page 11 Fig. AC17 as #105. Problem is it doesn't tell me how many I need, nor what their original spec diameter was. The knob on the sector shaft is slightly worn, but I would estimate that to be worn less than .005". Of greater concern is the worm gear. The deep spirals of it are in great shape with minimal wear. The outer diameter however is badly gouged and pitted. However, this doesn't appear to be due to wear or a case of misalignment, rather possibly a casting defect. The worm gear and sector shaft mate and slide smoothly. Anyone have any experience with this, and anyone know the original spec diamter or number of balls required for both bearings. Extra credit if you can tell me where to find some. As always, thanks for your help.

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wdTom

01-05-2007 19:15:35




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 Re: AC B Steering Gear Problem in reply to Brandon P. Weber, 01-04-2007 19:55:48  
If anyone needs loose bearing balls they can be found in a bicycle shop, possibly as large as 5/16, but in many smaller sizes.



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Paul from MI

01-05-2007 06:31:32




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 Re: AC B Steering Gear Problem in reply to Brandon P. Weber, 01-04-2007 19:55:48  
Missed a decimal Jerry-ball should be 0.3125". You can also find them at McMaster-Carr, they have website. Be sure if you don"t gety the balls from AC that they are hardened.
We could sure use some winter here in South Central Michigan, I"m sick& tired of rain.
Paul



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Jerry Coulter

01-05-2007 08:06:48




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 Re: AC B Steering Gear Problem in reply to Paul from MI, 01-05-2007 06:31:32  
I stand corrected. I misread my calculator. The steering gear whether Gemmer or Ross has to be the weakest point on the B & C. It seems that someone could rebuild them and do a great business.



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Jerry Coulter

01-05-2007 05:41:40




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 Re: AC B Steering Gear Problem in reply to Brandon P. Weber, 01-04-2007 19:55:48  
The AC part # is 915904. The model C gear takes 24 bearings, the model B gear, which you likely have, takes 20 bearing balls. Best I can remember, it is a 5/16" ball which is .03125". I see them in the miscellaneous hardware drawers at larger hardware stores.



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Brandon P. Weber

01-05-2007 11:11:38




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 Re: AC B Steering Gear Problem in reply to Jerry Coulter, 01-05-2007 05:41:40  
Thanks Jerry! I guess had I taken a few minutes to actually play with a calculator, I could've figured out the 5/16" part, but I thought maybe it was some exotic size, but hey, nodoby ever said I was a real bright. Sure enough, checked the local hardware, they're got 19 5/16" bearings on hand. Since they're going to be immersed in grease, there shouldn't be any problems with them not being stainless or anything, right? Also, is there anything I need to do to get the expansion plug back in, other than a little wham-em-all persuasion?

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Dick L

01-05-2007 13:43:16




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 Re: AC B Steering Gear Problem in reply to Brandon P. Weber, 01-05-2007 11:11:38  
You might want to get a new plug at napa if it does not have much of a crown. It still could be good to go. Lay it in place and whack the center good a with a hammer and see if it expands enough to hold. Probly was full of water and froze out.
Like Jerry said just go to the hardware store and look in their pull out drawers where the odd fasteners are located. They work as good as the AGCO ones.

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Brandon P. Weber

01-05-2007 16:28:26




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 Re: AC B Steering Gear Problem in reply to Dick L, 01-05-2007 13:43:16  
Actually Dick, I think what happened was when the bearings went out, it allowed so much up/down slop in the steering shaft, that it pushed it right out.



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TxAllisMan

01-05-2007 10:54:09




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 Re: AC B Steering Gear Problem in reply to Jerry Coulter, 01-05-2007 05:41:40  
Brandon I went to my local bearing supply and obtained many of my bearings for my 41 C.

If you have a bearing supply company in your area I would suggest to try them.

It never hurts to shop around and find a cheaper price.

I know I do it when Im in the market for parts.

Damon
N.E. Texas



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