Clutch will not disengage

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Clutch will not disengage

Postby Mbotelho » Mon Mar 04, 2019 9:39 pm

Hi everyone,
Brought home a '63 a few months ago and I've been having the time of my life playing with it! But, yesterday i started it in neutral, depressed the clutch, put in reverse, and backwards we went...despite having never releasing the clutch pedal. Depressing the pedal is ineffective and feels limp. The tractor is always in gear. Haven't split the tractor just yet. Is it safe to assume I need to replace the clutch? Thanks for the help!

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Re: Clutch will not disengage

Postby Eugene » Mon Mar 04, 2019 10:56 pm


For sure, you will need to split the tractor to find out what is going on.

First guess, throw out bearing is shot. Could be the pressure plate fingers are out of adjustment. And, also, could be a problem in the linkage.

Do not order parts until you find the problem(s).
I have an excuse. CRS.

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Re: Clutch will not disengage

Postby Glen » Mon Mar 04, 2019 11:06 pm

You could look up in the hand hole under the clutch area, with a good light, and see how it looks.
The 3 pressure plate fingers can get too low, then the clutch won't release. Their height is adjustable. They sort of commonly need adjusting.

Below is a post showing how to adjust them, without splitting the Cub. You would need to make the tool shown in the post to check the finger height.
The graphite in the throwout bearing can get worn down also, then it might not work right. It should look like the bearing in the post. The graphite sticks out of a new bearing 5/16". If it looks good, grease the bearing with cheap grease, so the oil in the grease will absorb into the graphite, while you are there.
There is a small hole on top of the original bearings to let out excess grease.


The clutch pedal should have 1" of free play, measured at the surface where you put your foot.
The free play being set wrong could make the clutch not release also.
There should be a spring under the platform to pull the clutch pedal up against the platform edge.
The brake pedals should have springs that look the same also.

Below is a page from a Cub owner's manual, showing how to set the clutch pedal free play, and it has a pic of the clutch. ... e%2056.jpg

Below is a pic showing where to measure to set the finger height, it is set with the clutch assembled on the flywheel, not off, like the pic shows.

If you can't fix it through the hand hole, then you will need to split the Cub. :)
Cub clutch 3.jpg
Last edited by Glen on Tue Mar 05, 2019 1:34 am, edited 1 time in total.

Jim Becker
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Re: Clutch will not disengage

Postby Jim Becker » Tue Mar 05, 2019 12:02 am

If it happened all at once, it is likely the graphite throwout bearing just shed all its graphite. It is also possible that some part of the linkage fell apart (like a pin fell out). You may be able to determine what happened by looking in the inspection hole on the bottom of the bell housing. You may be able to replace a missing pin through the inspection hole. But in all probability you will need to do a split.

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Re: Clutch will not disengage

Postby Slim140 » Tue Mar 05, 2019 6:28 am

If you have to split it and it sounds like you will, it will be a good time to replace the rear main seal on the engine. Contact tst and he can machine your retainer for a larger seal so you won’t have to worry about that leaking anytime soon.
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