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Rick in NC

10-04-2001 17:56:27

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Have a 1950 A-C Model B. The clutch has suddenly stopped disengaging when I push in the pedal. Unless I have the PTO engaged, the clutch will not disengage about 90% of the time forcing me to stop the engine, engage the correct gear, and then restart the tractor. Sometimes, even with the PTO putting a load in the driveline, the clutch does not always disengage.

The clutch pedal travel seems OK, and the engagement of the clutch is smooth and positive, but just won't always release.

Any suggestions?

If I have to split the tractor, I may as well replace the clutch, pressure plate, release bearing, shifter tube, rear oil seat, etc. But if there is any thing else I can check, I will appreciate any solutions.


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10-05-2001 18:08:57

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 Re: A-C MODEL B CLUTCH PROBLEM in reply to Rick in NC, 10-04-2001 17:56:27  
remove starter and look in the hole. a little oily? lay on the ground an look up thru the 4 inch hole under clutch, a little oily? if it dont drip on the ground too bad then you may be able to pressure wash thru both holes and blast everything in sight. worked on mine. Could just be several years of minor leaking and never been cleaned.

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dennis r. sarrazine

10-05-2001 14:46:13

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 Re: A-C MODEL B CLUTCH PROBLEM in reply to Rick in NC, 10-04-2001 17:56:27  
i have the same problem with my b if you remove the starter and spray the fly wheel with break cleaner it will clean the oil off temporaly it worked on mine but this winter i will have to change the rear seal

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Dale E.

10-05-2001 09:29:22

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 Re: A-C MODEL B CLUTCH PROBLEM in reply to Rick in NC, 10-04-2001 17:56:27  
Rick, D13 covered about everything. I'm with him in that it sounds like the throw-out bearing may be slipping. It may have finally wallered out its seat. When you get in there and its oily and the rear seal is ok it could be that the oil wick is to long, letting to much oil out the end of the crankshaft and also putting the drive shaft in a bind.(Not likely) Just something else to think about.

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Burl (ME)

10-05-2001 08:12:37

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 Re: A-C MODEL B CLUTCH PROBLEM in reply to Rick in NC, 10-04-2001 17:56:27  
Very similar to what recently happened on my Farmall 240. Turned out one of the pressure plate nubs that holds one of the release fingers broke off. Clutch pedal travel seemed almost mormal, tractor would stop with the brake, but would move if the brake pedal was released. Of course, I had to shut down to change gears. You should be able to do a good visual through the access with a helper operating the clutch. Good luck, and post what you find!

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Eric Egland

10-05-2001 06:12:49

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 Re: A-C MODEL B CLUTCH PROBLEM in reply to Rick in NC, 10-04-2001 17:56:27  
Ihave this problem in my 1990 ford diesel. after the first total clutch job, I began to wonder why the problem came back (same symptoms as your B). I realised that the rear main seal was leaking. why didn't they replace it when they had it apart? anyway, now I am nursing it along till winter. I believe this is your problem.good luck

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10-05-2001 05:28:00

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 Re: A-C MODEL B CLUTCH PROBLEM in reply to Rick in NC, 10-04-2001 17:56:27  
I had this very thing happen to my '47 B about 5 years ago. Mine wouldn't hardly disengage even with the mower deck engaged. I had to start the tractor in neutral and then grind it into gear..very damaging to say the least. On mine, it turned out to be the rear main seal of the engine throwing oil onto the flywheel and clutch, making them stick together. it really wasn't leaking onto the ground too bad but never-the-less it caused the problem. when I had the tractor apart, i went ahead and replaced the clutch, pressure plate, throwout bearing, and rear seal. you can replace the rear seal after the flywheel is off. BE CAREFUL, I seem to recall that after the last flywheel bolt was removed, there was no lip on the crankshaft to support the flywheel (cars usually have a lip)and the flywheel almost fell on my foot. Have a person hold the flywheel while you remove the bolts to prevent this. also, be sure to support the tractor good ...that front end can get pretty wobbly. The seal was completely shot in mine. the housing was still tapped into the block but the felt was all gone. My clutch works perfectly now and has for about 5 years.

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10-05-2001 02:58:50

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 Re: A-C MODEL B CLUTCH PROBLEM in reply to Rick in NC, 10-04-2001 17:56:27  
Two things come to mind.

First, the PTO tells me that the clutch wants to be loaded to disengage. Something is sticking. THat it doesn't release all the time indicates that it's sticking often.

The most likely possibilities are

Release fork worn to the point it will slip on the release bearing guide.
Release fingers worn / misadjusted, most likely worn.
Burr or wear on the trans input shaft holding the clutch against the flywheel(fairly likely).
Pressure plate guide nubs worn to the point the plate can rotate in the cover and jam, locking the cluth on no matter what (most likely).
Threads in the arm the clutch pedal rod threads into stripped (although usually the clutch pedal wouldn't return up).

You are going to have to split the tractor. The new clutch runs $90-128 depending on how nice a unit you want (rebuilt or new). Check the release bearing and replace if worn or sloppy.

Good luck.

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David Pozzi

12-01-2001 13:32:53

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 Re: Re: A-C MODEL B CLUTCH PROBLEM in reply to D13, 10-05-2001 02:58:50  
Also consider a loose pressure plate bolt.

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