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Allis Chalmers Discussion Forum
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Strange noise from AC WD rear wheels

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Will Herring

05-01-2006 22:35:48




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If I roll the tractor back and forth while the engine is off, I can hear a slight rocking noise. I'm worried that the bearings may be going out. There's plenty of oil where it needs to be. When I drive the tractor, the wheels are pretty quiet except in road gear when I can hear the wheel make noise off and on (if the tractor is pulling hard up a hill, I hear it... otherwise, it's normal). Is this a problem? I don't use it much more than 100 hours a year at most, and that's just for small tasks like pulling a wagon and downed trees or moving implements. That and occasionally mowing or pulling something like a disc or rotary hoe, I've no wish to try and plow with it.

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wdtom

05-03-2006 18:48:32




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 Re: Strange noise from AC WD rear wheels in reply to Will Herring, 05-01-2006 22:35:48  
Before you go looking for trouble in the bearings be sure you have check all the wheel and rim attaching points. Remove and reinstall all lug bolts that hold the wheel to the hub. I put grease on all of mine. Remove the rim, clean and grease the excentrics. These are cams that when loose allow you to spin the wheels wider or narrower. To loosen you put a wrench on the 3/4 bolt hear sticking out, the one closest to the rim, and turn it about 1/2 turn loose, you can see the stop or indicator to see how far to turn it. They can be rusted up and not turn. If necessary remove the tire, rim, wheel assembly. Remove the 8 bolts that hold the excentric brackets to the wheel, pound the wheel out of the rim. Now the brackets will fall off and you can work on them one at a time. the cam or excentric has a snap ring on one end, remove it. Pound cam out. It can take a big hammer. You may be able to turn them some once they are broken free. Clean, grease, reassemble everything. Make sure all cams are turned to the tight position. Now see if your noise is gone. Or different. It can be a bit*& to get the cams out and clean, I spent an hour or two on each one of several of mine. Post back or e mail me for more help if you need to, good luck.

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Brian G. NY

05-02-2006 16:50:01




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 Re: Strange noise from AC WD rear wheels in reply to Will Herring, 05-01-2006 22:35:48  
Will, check the eccentric clamps on your P.A. wheels. It may be a longshot but sometimes they will loosen up. They may only need retightening to the full "lock" position. However, the rails on my WD had worn some and would slip when changing direction under a heavy load causing a knocking sound. I found that by placing 1/32" spacers between the eccentrics and the rails I was able to get them to stop slipping.

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Brian G. NY

05-02-2006 16:52:24




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 Re: Strange noise from AC WD rear wheels in reply to Brian G. NY, 05-02-2006 16:50:01  
By the way, when the eccentrics are loose, you do get some wierd noises when going down the road in 4th gear.



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Will Herring

05-02-2006 18:14:36




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 The eccentric bolts are loose? in reply to Brian G. NY, 05-02-2006 16:52:24  
The eccentrics are what exactly? I assume they're one of the bolts on the outside of the rim.

I can also hear the light knocking if I roll the tractor when it is sitting still. But in other gears, I don't seem to get the noise. Even when it's in a heavy pull I don't notice it (perhaps because of the engine roar).



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Henry M

05-02-2006 16:23:20




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 Re: Strange noise from AC WD rear wheels in reply to Will Herring, 05-01-2006 22:35:48  
Will

I would use that tractor and monitor the noise. I bet it won't change. My two centagos.

However if you want to get into it I bet you could find all kinds of pitted bearings and races. The more you look the more you find.



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Will Herring

05-02-2006 18:15:28




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 Re: Strange noise from AC WD rear wheels in reply to Henry M, 05-02-2006 16:23:20  
Well I'll just continue to monitor it then. Thanks for the heads up.



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Henry M

05-02-2006 13:35:57




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 Re: Strange noise from AC WD rear wheels in reply to Will Herring, 05-01-2006 22:35:48  
Will

Has it been doing this for years or did it just start?



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Will Herring

05-02-2006 13:38:49




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 Re: Strange noise from AC WD rear wheels in reply to Henry M, 05-02-2006 13:35:57  
Well see, that's what I don't know. I just started actively using the tractor last summer, and it had sat in a shed for about 10 years and been run for a total of about 2 hours in that time. So while I was working with it, I noticed it was doing this one day.



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Will Herring

05-02-2006 12:01:31




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 Re: Strange noise from AC WD rear wheels in reply to Will Herring, 05-01-2006 22:35:48  
It's more of a light knocking noise, but I'll definitely keep an eye on it. Sounds like I might have to get it replaced sometime... Undoubtedly that'll be expensive.



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JMS/MN

05-02-2006 07:26:36




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 Re: Strange noise from AC WD rear wheels in reply to Will Herring, 05-01-2006 22:35:48  
Jack up the rear end high enough to get a pry pole under the tire and see if it has slack in it. Sounds like you might be in the early stage of bearing failure. If you do tear into it, make sure everything is securely blocked up, since you need to work underneath to get the snap rings off the bull gear shaft if you pull the axle.



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jeffalex2

05-02-2006 03:42:23




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 Re: Strange noise from AC WD rear wheels in reply to Will Herring, 05-01-2006 22:35:48  
If its a LIGHT clicking or knocking noise, its probably just some slop in the final drives and wont hurt anything with light use like you're describing...if it's a whining or grinding noise, it's worth pulling the tractor apart to investigate, 'cause, if it's a bearing that locks up, you could easily spin the housing, making it much more difficult to fix in the future.



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