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Fixing up my Grandpapa's AC B112


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#1 bb1980 OFFLINE  

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Posted May 16, 2016 - 09:11 PM

I was able to acquire my Grandpapa's old AC B112. He (Hubert) came with a mower deck, simplicity tiller and parts of an AC tiller, and a Wheel Horse dump cart. I plan to refresh the old fella for plowing and tilling my garden. This will by no means be a show resto, but rather a user refresh. This will be my place to showcase the saga.

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#2 bb1980 OFFLINE  

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Posted May 16, 2016 - 09:24 PM

So last night started the tear down. I got pretty far and found some issues. Varidrive was gimped up. It had been disconnected at the linkage and the rear fork locked in place with a bolt. The front fork and bearing were destroyed.
The bgb has 1/8 turn free play on input shaft. The rear fiber coupling was almost gone from apparent being rubbed against by the disconnected Varidrive shift rod. I got pretty far on the teardown overall.

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#3 hamman OFFLINE  

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Posted May 16, 2016 - 09:31 PM

Great to see you taking Grandpa's tractor and fixing it up. Doesn't need to be pretty to use, just needs to be mechanically sound. I'm sure Grandpa would be proud. I'm also pretty sure Hubert will like it. Thanks for sharing.                                                                                                                                        Roger


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#4 petrj6 ONLINE  

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Posted May 17, 2016 - 04:08 AM

   those vari-drives are a pain in the rear!!!!  I rebuilt one awhile ago and never could get it to work correctly.  cant wait to see the pics of your refurb.  I have a parts machine here if you need anything.

                                                    Pete


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#5 bb1980 OFFLINE  

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Posted May 18, 2016 - 10:42 PM

Disassemble this, disassemble that. Taking LOTS of pictures so I can put it all back! Tear down is fun. Learning a lot about the tractor. I am having a bit of a disagreement with the front varishift pulley. Lots of heat got it moving, but it's stuck near the end. I have a NOS bgb rebuild kit with new shafts coming, so I may just cut the output shaft off behind the pulley. Does anyone know the i.d. and o.d. of the bgb shims inside of the box? I am planning on ordering some generic shims, since I can't find originals anywhere.

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#6 bb1980 OFFLINE  

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Posted May 19, 2016 - 07:07 PM

Here's a video of my bgb input shaft play:


And here is the rear Varishift pulley/bearing play:


#7 bb1980 OFFLINE  

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Posted May 21, 2016 - 01:05 AM

And here is the side to side bgb play:



#8 bb1980 OFFLINE  

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Posted May 21, 2016 - 01:16 AM

A little more tear down today. The front half is mostly bare except for the steering and wheels. I picked up a used Varidrive shifter assembly and a set of pulleys from eBay. Today I tore it down, wire brushed it good, cleaned each piece with 409 cleaner and then rustoleum rusty metal primer and rustoleum professional black (uses alkyds). I also bought new bolts to put it back together.

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#9 bb1980 OFFLINE  

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Posted June 04, 2016 - 09:32 PM

I was finally able to get the front Varidrive pulley off. The end of the shaft was mushroomed, so I had to tap the pulley back some, the grind off 1/8" of the shaft, then was able to pull the pulley off. I figure if the shaft wasn't too bad, I could rethread the end and keep it as a spare since I have a NOS shaft to put in. I also had to grind off the front steering arm on the left front wheel spindle where it had been booger welded on. Lastly for the week I took the Varidrive idler pulley apart by drilling out the rivets to replace the bearing. The old bearing was a 6202-rs3, which I couldn't find a replacement for. It was a 6202 bearing with a 3/8 bore, which I couldn't find. I measured all dimensions in std and metric. I found a 6300 bearing with a 10mm bore that was close other than the bore. .375 for the old vs .393 for the new. I am just going to replace the pulley bolt with an equal length 10mm bolt. I primed and painted the pulley halves, put the new bearing in, and bolted the pulley back together with M4 Allen bolts. Now it is good to go and serviceable in the future.

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Edited by bb1980, June 04, 2016 - 09:35 PM.

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#10 tractorskipper OFFLINE  

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Posted June 05, 2016 - 09:59 PM

Good project.  You seem very good at "work-arounds".


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#11 Alc OFFLINE  

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Posted June 06, 2016 - 05:28 AM

Glad that you been able to get parts and things working again , was this varidrive  an option ?  Or something a dealer might install or was it just to that model ?



#12 bb1980 OFFLINE  

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Posted June 06, 2016 - 07:12 AM

Glad that you been able to get parts and things working again , was this varidrive an option ? Or something a dealer might install or was it just to that model ?


I think (and could be wrong) on the Allis Chalmers a B110 had fixed pulleys, a B112 had Varidrive, and a HB112 had hydro transmission and Varidrive. I'm not sure how the models are laid out on the Simplicity side.

Edited by bb1980, June 06, 2016 - 07:35 AM.

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