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Allis Chalmers Discussion Forum
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belt pulley

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mshadow

03-19-2006 16:27:46




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I have a 1951 WD which never had a belt pulley on it when I purchased it. I did get the pulley with it and have now decided to put the belt pulley on. When I started the tractor, the belt pulley began to turn. I thought the pulley only turns if the pto is engaged, which the pto was not engaged. I engaged the pto and disengaged it again, but the belt pulley continues to turn. My other tractors do not turn unless the pto is engaged. Is this normal for a "WD" or is something wrong with it?

Mike

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JMS/MN

03-20-2006 14:53:16




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 Re: belt pulley in reply to mshadow, 03-19-2006 16:27:46  
I responded twice last night to your post- it showed the name with no post each time. Here's the story- first of all, you need a manual which explains operation of all controls. PTO and pulley operation are not related in any way. Regarding the pulley-you got a pulley from another tractor, so whatever index mark you find- like Eldon mentions, means nothing to your tractor. Tapered holes in the pulley sleeve are drilled at different distances from the end of the shaft- they let you set correct gear lash (slop). Find a hole that allows you to rotate the pulley about 1/8-1/4 inch back and forth. Tighter or looser than that will cause excessive wear on the drive gears. When you find the right hole- mark the top of the sleeve with a chisel, also mark the top of the tractor frame to align it with. Then if you ever take off the pulley, you can reinsert it in the right location without going through the same locating process,. That is what dealers did years ago when they sold a tractor with the pulley.

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Dave Grubb

03-20-2006 08:56:23




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 Re: belt pulley in reply to mshadow, 03-19-2006 16:27:46  
There are a series of holes for the lock bolt to enter when the pulley is engaged. The holes are located at different lenghts from the end of the pulley barrel. The manual says to use a hole that provides 1/8" play between the rim of the pulley and the frame rail. This why there should be a reference mark on the barrel somewhere; presuming this pulley is original to this tractor.



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old

03-19-2006 17:09:54




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 Re: belt pulley in reply to mshadow, 03-19-2006 16:27:46  
Yep thats how it works, I asked the same thing back in sept. about my WC speed patrol which I put a belt pulley on.



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Eldon (WA)

03-19-2006 17:02:05




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 Re: belt pulley in reply to mshadow, 03-19-2006 16:27:46  
When you do not want it to run, loosen the set screw and slide the pulley out until it is disengaged, then snug up the screw. There should be an index mark on the frame rail and pulley housing that you line up for the proper backlash when in the working position.



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Bud H

03-19-2006 16:50:44




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 Re: belt pulley in reply to mshadow, 03-19-2006 16:27:46  
The belt pulley on a WD runs off the same shaft that runs the hydraulic pump. It runs as long as the foot clutch is engaged. It does not run off the pto.



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