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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Cletrac OC3 Clutch

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Anthony Basinge

12-05-2006 17:10:54




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Hello,

I have a 1956 cletrac OC3 with a homeade auxilary transmission. The transmission works great, but i have a question. What would cause the propeller shaft to keep spinning after clutch pedal is depressed? I know this is on some other old tractors. But why doesnt it disengage?

Any help appreciated,

Anthony




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old

12-05-2006 18:30:53




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 Re: Cletrac OC3 Clutch in reply to Anthony Basinger, 12-05-2006 17:10:54  
Does it spin and never stop or does it spin and then after a minute or so stop. If it never stops then it could be oil on the clutch disc, or a rusty flywheel/preassure plate, or you need to adjust the linkage any one could be your problem



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jdemaris

12-05-2006 17:38:07




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 Re: Cletrac OC3 Clutch in reply to Anthony Basinger, 12-05-2006 17:10:54  
Usually it's oil on the clutch disk that makes it drag - unless your pilot bushing/bearing is dragging. Is your aux. trans. a Ford Model A three-speed like the original aux?



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Anthony Basinger

12-05-2006 18:43:58




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 Re: Cletrac OC3 Clutch in reply to jdemaris, 12-05-2006 17:38:07  
John, its of your design. I have 600 weight in the ford transmission. I have had it apart a few times and cleaned up the pilot bearing. One David Spitzli installed it if you know him.

Its happened numerous times. I have the play at 3/4 inch now. It has been working great with the oil and pilot bearing clean but now its starting to turn itself again after maybe 10 minutes of use. It acts like i am not pushing the pedal in all the way. When i had it apart, I noticed that the release arms were a bit loose. Is this something to be concerned about? How can i insure that the pilot bearing isnt dragging?

Thanks old and John


PS very nice design mr. demaris I like it a lot.

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jdemaris

12-06-2006 05:56:47




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 Re: Cletrac OC3 Clutch in reply to Anthony Basinger, 12-05-2006 18:43:58  
I've got two that I built for my own use and they don't drag at all. I was concerned about drag at first because I updated the Ford A transmissions to use a thinner oil - 90W. To do so, I had to install sealed-bearings front and back. So, it makes me wonder about your clutch setup. What type of pressure-plate did you use, and what type and brand of disk? Cletrac used two different style pressure-plates - Auburn or Rockford as I recall. One has stamped-steel fingers and the other has cast fingers with adjuster-bolts. The disks I use are new, spring-loaded, reproduction for Ford Model A cars. They are much better them some of the OEM rebuilts disks I see sold. A disk with some high spots or loose spots can cause centrifugal drag - a it starts to spin little pieces stick out and rub on the flywheel and pressure plate. Another thing to think about is clearances. I know I was careful to allow some fore-and-aft play for the transmission input shaft into the flywheel. If your setup did not allow any excess fore-and-aft play, and your engine crankshaft walks a bit - front-to-back, that can cause drag by putting pressure against the transmission input stub. All it would take is a slightly worn main/thrust bearing in the engine.

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J Schwiebert

12-06-2006 15:26:40




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 Re: Cletrac OC3 Clutch in reply to jdemaris, 12-06-2006 05:56:47  
The thrust bearing is inside the engine on one of the main bearing. The reason I say it that way some engines use the center as the thrust, some the rear main. Also since you have the adjustable pressure plate the height of these levers may also be too low especially if a new disk has been installed. There are many little things that could cause the problem along with what Jdemaris mentioned. I am trying to help you also since you almost live in the neighborhood. More questions? J.

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Anthony Basinger

12-06-2006 14:59:00




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 Re: Cletrac OC3 Clutch in reply to jdemaris, 12-06-2006 05:56:47  
The one thats in there is the cast with adjuster bolts. I am not 100% but i think the disk is spring loaded. You think changing them would help? I do recall an amount of reaaaally thick grease aroundthe inside of the flywheel housing. Could this get on the bearing and on the disks? Where is the thrust bearing?



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