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Cub Clutch

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scott 1957lboy

02-25-2008 20:34:23




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I have an older loboy (1957). It sat for awhile and runs real good. My problem is when I push in the clutch the engine slows down a bit. Also it tends to grind when I put it in gear. I have adjusted the pedal to the point the throwout yolk started to grind around the pressure plate and adjusted so it's just misses it. I still have a problem geting it into gear sometimes. I got under the tractor with it running and pushed the clutch in and saw the the driveshaft is turning very slow when the clutch is depressed. Is it time for a new disc? or could it frozen to the pressure plate? I really want to avoid spliting the tractor if there is an easier fix. Thanks for input. Scott

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haas

02-26-2008 07:00:18




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 Re: Cub Clutch in reply to scott 1957lboy, 02-25-2008 20:34:23  
As Janicholson said, it's the pilot bearing or the splines on the shaft not allowing the disc to slide freely away from the flywheel. Since the tractor sat for a long time, there is likely some crud or rust in the splines and/or the pilot bearing (bushing) is dry or corroded. If the clutch is not slipping, you probably don't need a new clutch disk. However since you are going to have to split the tractor to fix this, you may want to do the clutch replacement anyway. What you describe is common and maybe you need to just live with it if it is not too bad. If you split to fix, make sure the pilot bushing has some grease on it when you reassemble and that the clutch disk slides easily and smoothly on the shaft splines. A little lube or antiseize on the splines is a good idea too. Since there is not much resistance in the Cub transmission when in neutral, the clutch has to be nearly perfect for things to stop when you disengage the clutch. Even then, you may have to wait a bit for thinks to quit turning before you try to engage the gears. If you start the engine with the clutch disengaged but the transmission in gear, you can minimize the problem because the gears will not be turning if the tractor is not moving.

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Janicholson

02-26-2008 05:54:57




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 Re: Cub Clutch in reply to scott 1957lboy, 02-25-2008 20:34:23  
The pilot bearing in the center of the flywheel (that takes the very tip of the clutch shaft) could be needing lube, or bad. The splines on the clutch shaft could be worn, allowing it to hang up on the disk causing the disk to rub the PP. The last issue might be the disk being warped some causing it to drag on the FW, or PP, or both. Other than possible lube of the pilot, splitting may be needed. JimN

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scott 1957lboy

02-26-2008 06:31:27




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 Re: Cub Clutch in reply to Janicholson, 02-26-2008 05:54:57  
Can I lube the shaft and pilot bearing with some WD-40 through the inspection plate?



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Bigdog

02-26-2008 06:47:30




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 Re: Cub Clutch in reply to scott 1957lboy, 02-26-2008 06:31:27  
WD 40 will do nothing for the pilot bushing and you can't get to it through the hand hole anyway. The only way to get to it is to split the tractor. If you haven't done so already, grease the throwout bearing too.



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scott 1957lboy

02-26-2008 07:28:49




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 Re: Cub Clutch in reply to Bigdog, 02-26-2008 06:47:30  
On the outside chance it's not the pilot bearing any other ideas other then the split. How about depressing the clutch and spraying some brake cleaner on the disc? Am I grasping?



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Bigdog

02-26-2008 12:13:06




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 Re: Cub Clutch in reply to scott 1957lboy, 02-26-2008 07:28:49  
Other than what has been mentioned, a warped clutch plate or a bent input shaft are what come to mind and any of these will require a split. I honestly don't think there's an easy fix on this one. It's not that the other things are hard to do but without splitting, there is no miracle cure.



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John M

02-26-2008 02:58:01




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 Re: Cub Clutch in reply to scott 1957lboy, 02-25-2008 20:34:23  
The slowing down of the engine is normal for the Cub because of the material used in the throwout bearing. When I first got my Cub it had set fora few years and was doing the same thing yours is, when the new pressure plate was installed the fingers werent set right, and there was some rust on the flywheel and the splines on the shaft. I was going to split it anyways to repalce the rear main, so I just cleaned it all up, set the fingers and away I went.

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