Clutch adjustment?

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grasser
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Clutch adjustment?

Postby grasser » Thu Mar 28, 2013 12:14 pm

Sorry to ask, but need some help.
It takes a long time (10 seconds or so) after the clutch is depressed on my '48 Cub for things to stop spinning allowing me to put it in gear.
When shifting from one gear to another it's not an issue at all as the shaft quits turning as soon as the clutch is depressed as it should.
I adjusted the clutch fingers per the how to section last night, but it didn't really affect this issue.
I saw the clevis adjustment next to the throw out bearing through the inspection hole. Do I need to adjust that?
If so, can it be done through the hole?

Maybe the throw out bearing is bad?

Your help appreciated.
Justin

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Re: Clutch adjustment?

Postby Boss Hog » Thu Mar 28, 2013 12:35 pm

the main shaft may be tight in the pilot bushing, This can be helped by getting the rear of the cub much higher than the front and spraying liquid wrench on the shaft next to the clutch, it will creep down to the bushing. you need about an inch of free travel in the clutch pedal. IF you have much more that may be the problem.
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cub47
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Re: Clutch adjustment?

Postby cub47 » Thu Mar 28, 2013 12:45 pm

grasser wrote:Sorry to ask, but need some help.

I saw the clevis adjustment next to the throw out bearing through the inspection hole. Do I need to adjust that?
If so, can it be done through the hole?

Maybe the throw out bearing is bad?



Yes, you can adjust your clutch pedal free play through the access hole. It sounds like you have an internal adjustment for that instead of the external bolt style adjuster on the pedal. This was changed by IH in 1948.

Once you have the 1" travel of your pedal (at the end) that David mentioned, make sure you maintain about an 1/8" space between the throw-out bearing face and the fingers.

Take a look at your throw-out bearing with a flash light, how much wearable surface is still beyond the retainer? Make sure it is not chipped or cracked.

Sounds like you have the pressure plate fingers at the correct height adjustment and they are all even if you followed the "how-to".

cub47
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Re: Clutch adjustment?

Postby cub47 » Thu Mar 28, 2013 12:52 pm

A picture that may help:

(courtesy of Rudi's manual server)

http://www.cleancomputes.com/Cub/Cub%20 ... age-40.jpg

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Rick Spivey
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Re: Clutch adjustment?

Postby Rick Spivey » Thu Mar 28, 2013 4:33 pm

I'm gonna say definitely a tight pilot bushing. When you are in gear, and stop the tractor to shift to another gear, the transmission stops the main shaft from spinning. Therefore no issue gear to gear. But when you have been in neutral with the clutch out, and depress the clutch to shift into a gear, there is nothing but friction to stop it, and the friction of the shaft on the pilot bushing is greater. Lubricant may be all it takes, otherwise you have to split and see if problem is shaft (bent or burred), or bushing (worn out).
Rick Spivey
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grasser
Cub Star
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Posts: 141
Joined: Sat Feb 18, 2012 6:50 am
Zip Code: 46725
Tractors Owned: '47 Cub
'77 IH Cub
'49 Farmall C w/trip bucket loader
Dad's WD-45
Circle of Safety: Y
Location: Whitley County Indiana

Re: Clutch adjustment?

Postby grasser » Thu Mar 28, 2013 10:03 pm

Thanks guys, I'll try lubing the shaft and see what happens.
This cub had sat for 2 years before I got it last summer. I've since had several issues that cleared up after either lube, or just use.
Justin


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