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Allis Chalmers Discussion Forum
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C Allis clutch

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Russ1

08-18-2005 07:34:41




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I have changed the clutch and pressure plate, new release bearing, new pilot bushing on my Allis Chalmers C. The clutch won't release to allow tactor to go into gear. Gears just clash. If I start it in gear it is fine and doesn't move with the clutch dpressed. I have pulled it apart and rechecked the installation but can't find the problem. Everything appears to work normally. Any suggestions as to where to go/what to check from here?
Thanks in advance. Russ

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Dale (MS)

08-21-2005 07:51:42




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 Re: C Allis clutch in reply to Russ1, 08-18-2005 07:34:41  
Russ1, I have had similar problems and have had good luck doing what WDTOM and Dick L mentioned.There is one that I will redo this fall as I didn't get the nut tight enough. Does fine if its started with clutch in and in gear, just can't put in nuetral with engine running and let out on clutch and be able to put back in gear without turning tractor back off and restarting. Dale



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wdtom

08-18-2005 17:29:20




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 Re: C Allis clutch in reply to Russ1, 08-18-2005 07:34:41  
After joining the parts from two different tractors to make one I had the same problem. It turned out to be the pilot pearing was too tight on the polot shaft. It would spin ok if you started it in gear with the clutch pedal down, and would shift ok but if you tried to put in into gear after the engine was running the gears would never stop spinning. Just a little with emery cloth and a little smaller shaft to hold the emery cloth fixed it. Cleaned out the bearing, put some grease in it and it has been fine since.

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wdtom

08-18-2005 17:31:55




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 Re: C Allis clutch in reply to wdtom, 08-18-2005 17:29:20  
Should have proof read my post, should have been POLOT BEARING and PILOT SHAFT. Sorry.



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Janicholson

08-18-2005 13:11:44




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 Re: C Allis clutch in reply to Russ1, 08-18-2005 07:34:41  
Wear on the clutch shaft splines (or roughness) can cause the disk to not float on the shaft. This allows the disk to brush up against the Pressure plate, or flywheel dragging the input shaft into motion. The trans lube should be thick enough to resist the minscule drag from the pilot bearing, and the "wind" of the assembly spinning on the disc. Thghtening the preload on the lay shaft is appropriate if it is loose, and then only to spec.
My two cents
Jim Nicholson

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Dick L

08-18-2005 11:52:30




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 Re: C Allis clutch in reply to Russ1, 08-18-2005 07:34:41  
The clutch has nothing to do with your problem.
The nut on your transmissions counter shaft has to be tightened untill you have enough drag to keep the gears from free spinning. The nut has been staked with a chisle. It will still turn tighter with a long enough handle on your wrench. It will need to be restaked after adjusting the nut. The picture shows where this adjustment nut is located. I have had to adjust every one of these transmissions on the tractors I have fixed up. third party image

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Russ1

08-18-2005 12:28:33




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 Dick L in reply to Dick L, 08-18-2005 11:52:30  
Please see my response to your message.
Thanks



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Russ1

08-18-2005 12:25:37




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 Re: C Allis clutch in reply to Dick L, 08-18-2005 11:52:30  
Is pulling the tractor apart at this point as simple as pulling it apart at the flywheel area. How tight should I make this nut?

Thanks a million for your input. Since I posted this message I had determined that the clutch is releasing properly.

Russ



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Dick L

08-18-2005 13:05:52




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 Re: C Allis clutch in reply to Russ1, 08-18-2005 12:25:37  
It is hard to explane how tight with out knowing your experiance. If you have replaced front wheel bearings on an older car, lets say 50"s and 60"s. You would not only tighten to where the tire would slow but you would listen to the bearing sound as it slowed with drag. You have to turn the transmission in nutural with the drive shaft stub and add drag and listen to the sound of the bearing. The bearing will get a rough sound as you tighten the nut. The manual will call out a pound test but I have never had the proper test setup. If you get the nut too tight the bearing will not last long. If you have done wheel bearings it is only slightly tighter than wheel bearings.
In splitting the tractor at the transmission, I do not think it is that bad of a deal. I don"t like to do it, just because I am old and would rather not be down on my knees that much. At least the next morning!
I was attempting to help someone who needed to split a tractor at the transmission when I had a B I was rebuilding and had the final drives off and the transmission was in need of a rebuild as well. This can be done with the final drives attached rather than how it is shown in the picture. I use a floor jack with wheels slid in from under the drawbar and roll the transmission back on the jack and tires when the final drives are intact. The pictures at the link starting with # 7 thru picture #9 has instructions under the pictures that might help.

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Texas Denny

08-18-2005 08:23:44




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 Re: C Allis clutch in reply to Russ1, 08-18-2005 07:34:41  
If you remove the clutch rod from the clutch pedal, you can rotate the rod and make it longer. You probably have too much freeplay which doesn't permit enough travel for complete disengagement.

Another bad thought is that the disc is sticking to the clutch plate or flywheel. But try the adjustment first.



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