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Allis Chalmers Discussion Forum
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Wheel tightening AC -B

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Tom Crawford

05-24-2005 09:01:14




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I have a late model Allis Chalmers B The wheel is attached by means of four metal catches that are concave and fit onto high places on the rim. One of them has a bolt that appears to work on an eccentric. I can't seem to get everything together so the rim is completely tight. any ideas? Tom




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Chris (OR)

05-24-2005 10:39:45




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 Re: Wheel tightening AC -B in reply to Tom Crawford, 05-24-2005 09:01:14  
What I managed to do when putting mine back together....

I set up the rim/tire flat on a set of saw horses. There was a third horse (with a wide top) in the middle of the rim. I then took a pile of 2X4 scraps and blocked up the cast hub to be really close to where it needed to be in relationship to the rim. I then fished the bolts and concave locking blocks into place and finger tightened them. You will need to have two eccentric bolts. These need to be next to each other (at right angles). The heads of the eccentrics will have a cross on them so you can see where the lobe is. Torque on these to snug them in place. Lastly tighten the other two bolts.

You may have to do this more than once to set up the wheel spacing (what ever the row spacing of the crop you are working on). You should notice that the lip on the rim is not centered and you can have the locking blocks on either side of the cast hub. Also if you are going to run a Woods L59 mower, the will not always be the same set up on each wheel. Mine is not symetical to get the deck to stick out as far as I can get it...

Hope this helps...

Chris Horn
Scappoose Oregon

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Texas Denny

05-24-2005 09:35:54




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 Re: Wheel tightening AC -B in reply to Tom Crawford, 05-24-2005 09:01:14  
Before starting the operation, I would recommend marking the clamps, wheel and rim so you can reassemble the same way you take it apart. If this has been set up for a while, it is very unlikely that you would ever get these eccentrics loose without taking the wheel apart first.

I did this on my C Allis a couple of months ago (C has the same rim as the B). My memory says there are two of these eccentric bolts and two that are not. Both of my eccentrics were frozen. I took off all of the nuts and lock washers and then replaced the nuts till they were flush with the bolt. I then drove out all four bolts at the same time - using a heavy hammer on one and then going around the wheel to each until all the bolts were driven down to the nut. Then I backed off the nut about half of the threads and drove them all out again. I think by this time the wheel dropped off the rim. I may have had to use a punch to complete removal.

When you are doing this, you must be certain that the rim is supported high enough that the wheel has clearance to the floor at all times. Once the wheel is off, you need to free up all four bolts and get them to rotate freely with no catches. Then you reassemble. I also used a thread chaser to clean the threads of both the bolts and nuts before reassembly.

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Tom Crawford

05-24-2005 11:26:59




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 Re: Wheel tightening AC -B in reply to Texas Denny, 05-24-2005 09:35:54  
I didn't realize there were two eccentrics. This is most likely the problem. I'll work on it. Thanks for the replies. Tom



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steve(ill)

05-24-2005 14:57:43




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 Re: Wheel tightening AC -B in reply to Tom Crawford, 05-24-2005 11:26:59  
there are two ecentrics or "cams" as you said. the two bolts on these two ecentrics are egg shaped. to install, you put the two normal locks at the 10 and 2 o"clock position and snug the bolts. set the rim on these two locks so the tire fill valve is in the right positon and the two blocks welded to the rim are straddling a clamp. the tire and rim should be hanging an inch off the ground.---- now put one of the ecentrics and bolt in at the 8 o'clock position and another at the 4 oclock position. put a socket and ratchet on the cam bolt and turn so it ecentrics OUTward toward the rim. if the two ecentrics get tight, good, install the nuts.---- if they dont get tight you will need to take the two clamps back off and weld- lay an 1/8 inch of material into the VEE and grind it semi-smooth so you can get more cam action aginst the rim.--- now reinstall and tighten again.

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Tom Crawford

05-25-2005 05:43:48




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 Re: Wheel tightening AC -B in reply to steve(ill), 05-24-2005 14:57:43  
Steve, Looks like you have the answer, I'll need to build them up a little with weld. Thanks Tom



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ed in cny

05-27-2005 16:58:05




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 Re: Wheel tightening AC -B in reply to Tom Crawford, 05-25-2005 05:43:48  
The bolts are for sale at the allis dealer. Not cheep but brand new. I think I hac=d to pay 15.00 or so for them. My Brother in law got carried away with the torch and replacement was in order. I have seen them on ebay many times and the go quite cheep.



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