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Cub Farmall Throw out bearing question

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Farmallb

Well-known Member
I had mine go out on my 1950 Cub Demonstrator. I ordered another. It got here yesterday. Its a sloppy fit. The Cub shaft is an inch thereabouts, and the bearing hole is 1 1/4. Called VB They said that is the right bearing. Any u guys know?
 
The bearing sits in the yoke and must slide forward and backward over the top of the shaft. It does it's work when the graphite surface pushes against the three fingers on the pressure plate disengaging the clutch disk. Soak the TOB in oil before installing for the graphite to absorb the oil. Also, keep it greased.
 
(The bearing slides back and forth over the top of the shaft). OVER THE T O P OF THE SHAFT??? What does that mean. I think the bearing has to center all AROUND the shaft.

What/Where is the graphite surface??

It has NO grease zerk.
 
I took an brass bushing I had, sliced it sideways down one side, put it in a vice to bring it back together again and fitted it inside the bearing. I coated the inside of the bushing and the shaft with neverseeze. It works fine now, but I want to know if that's the right thing to do before I button it back up.
 
I"d be careful here trying to invent your own bearing. Something isn"t right, you shouldn"t have to invent a bushing. I"d be worried about the pressure plate fingers contacting the bearing in the wrong spot, and maybe as you depress the pedal, the fingers hiting the wrong area and destroying something.
 
yeah, Im worried about that too. But without it, theres a 1/4in gap and I cant see how the shaft could grab the bearing to cause it to rotate.
 
The shaft is NOT supposed to "grab" the bearing.

The bearing does not rotate.

A Cub throwout bearing looks like this:
http://www.external_link/new/cl/378fp.htm

The gray surface in the first image is the graphite.

If you have anything different you have the WRONG bearing. There are some aftermarket ball bearings, but they do not last long.
 
Your site didn't open. The bearing has 2 studs that fit in the brackets that hold those studs. The center hole is 1 1/4in dia. The shaft is 1in dia.
 
NO you have a graphite thro-out bearing and its not supposed to ride on the shaft its job is to push against the fingers on the pressure plate
 
No it has nothing at all to do with the shaft diameter. It is carried by the yoke and pivots on the round tabs on either side. The rod attaches at the bottom and pushes the bearing...kinda in a pendulum action against toward the clutch levers where it presses against them squarely. It has no direct contact with the pilot shaft.
 
Before reassembling the cub, check the height of the fingers on the throwout bearing, they should clear the back of the pressure plate by 1 1/4 inch, and must be even. If you did not buy a bearing from IH, soak it in 10 weight oil for a couple days before installing. Grease it yearly with cheap grease. It is lubricated by the oil separating from the wax base and soaking through the graphite to the front. If you use high temperature grease the graphite does not get lubricated.
 
If you can't grease it, then you need to return it to where you bought it from and get one that does have a grease zerk.
The grease is a critical part of the operation of the TOB, and without it, it will fail in short order.
 
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