Major noise trans or clutch

[Bamacub]

Hope I can explane this correct noise only happens when clutch is depressed. Sometimes the clutch will not release, but not always. I have looked in the inspection hole nothing unusual. The noise sounds like maybe the front of the trans. Hope you experts can help

[staninlowerAL]

Most likely causes, TOB worn and needs replacing or adjust linkage so TOB carrier does not connect with PP fingers when clutch is depressed.

[Bamacub]

I plan to do a split Sat and inspect clutch pressure plate and bearing. If all is good then I will take the tube off and check the front trans bearing

[staninlowerAL]

While you have it apart, check the TOB yoke, hanger, linkage for wear. The holes get elongated from wear and that affects the function and alignment.

[Glen]

Hi,
If you hear a grinding or metal to metal sound coming from the clutch area when you push the clutch pedal down, it is probably the throwout bearing or throwout bearing holder hitting the pressure plate.
Do not hold the pedal down far enough that the noise happens, it can damage the parts.
There have been posts about this lately on here.

Like Stan said above it can be the throwout bearing material worn down, or the pressure plate fingers could be too low, and need adjusting. They have to be a certain height so the clutch will work right.
Below is a post showing how to adjust the finger height. You need a good light to see in the hand hole.

viewtopic.php?f=141&t=66543

The material sticks out of a new throwout bearing 5/16". Below is a pic of a new throwout bearing.
You could grease the grease fitting on the throwout bearing while you are under the Cub.

[Bamacub]

Thanks guy for your imput. This has got me stomped as long as the cub is running like mowing no noise, but depress the clutch and a big noise. The noise sounds like maybe the front of the trans, but I know noise can fool us. Looking in inspection hole don't see anything unusual

[Glen]

Hi,
When you push the clutch pedal down, the clutch shaft, which is the upper shaft in the transmission also, should stop turning, so if it stops turning, there would be no noise coming from the trans, nothing on the top shaft is turning at the trans.
I think you said the trans is quiet when running with the clutch pedal up.

Check the clutch pedal free play, it should have 1" free play, if the Cub is newer than serial number 32229, measured at the surface you put your foot on. The pedal should be held up against the platform edge by a spring under the platform.
The pedal should move freely at it's base, which goes into the clutch housing. Lube it and free it up if it is tight moving.
The brake pedals should have springs too, that look the same as the clutch pedal spring.

Also check the throwout bearing, and pressure plate finger height, like the link I posted above shows. The bearing can hit the pressure plate if the fingers are low, you might not see anything wrong looking in the hand hole.

If the finger height is correct, it may have a dry clutch pilot bushing, which can make noise, it is sort of a howling noise. It might not be serious, just noisy. The pilot bushing needs oiling. It is sort of hard to get to, in the end of the crankshaft.
Some of the guys on here have said it can be oiled with a plastic oiler, with a long small tube, working up through the hand hole. Park the tractor with the rear end higher than the front, so oil will run into the bushing, then use a good light, and apply oil at the front of the long shaft, it is ahead of the pressure plate and disc. Do not get oil on the disc, and lining. Leave the cub sitting for some time, so oil can get into the bushing. This might help, if the bushing is dry.

You didn't say what year the Cub is.

Below is a page from the 1955 Cub owner's manual showing the clutch assembled, and the pilot bushing at the right side of the pic.

http://farmallcub.com/rudi_cub/www.clea ... e%2056.jpg

[Bamacub]

I have the tranny cover off, with the tractor in gear clutch depressed tractor running main shaft has a bad vibration and noisey. Shaft not turning

[Bamacub]

The clutch is not releasing, checked all adjustments all chech good. Looks like a split

[Bamacub]

trouble found polit bushing bad

[Glen]

Hi,
If you put in a new pilot bushing, the ID needs measuring after you drive it into the crankshaft.
The guys on here have said some of the new pilot bushings are too small an ID after installing them, they shrink slightly when installed, then the clutch shaft will not stop turning when you push the clutch pedal down, because the bushing holds the shaft too tightly.

The Cub service manual shows the clearances. I would measure it before putting the pressure plate on.
Measure the end of the shaft also, and be sure it is smooth where it runs in the bearing.
The bushing needs reaming if it is too small.
Below is a page from the Cub service manual showing the clearance.

http://www.farmallcub.info/manuals/gss- ... 005-02.jpg

Oil or grease inside the bushing before putting the tractor together.

[Bamacub]

Thanks for the info ,i was just thinking what could have worn it that bad since a rebuilt 2 years ago. Could the main shaft be out of round not straight

[Glen]

Hi,
Too bad it needed another repair that soon.
You could turn the shaft while the Cub is split and see if the front end of it moves up and down. It should stay in the same position while turning if it is straight, as far as I know.

I don't know how the quality of all the brands of bushings are. TM Tractor has a Case IH bushing the listing says.

http://www.tmtractor.com/new/cl/067fp.htm

[Bamacub]

New polit bushing cub is purring like a kitten again