Hard to tell what we're looking at, due to the blurriness.
Here's my SA's bell housing on the torque tube, straight-on..
The round thing is the throw-out bearing. It sits on a Y-shaped yoke, which pivots at the top and the bottom. The top pivot is fixed, on a shaft that is inserted from outside the torque-tube. the bottom pivot is connected to the shaft that is pushed when you depress the clutch pedal- the bottom of the yoke moves forward, pushing the bearing onto the fingers of the pressure plate that is bolted to the back of the flywheel. This bearing is a relatively cheap piece, and I agree with the others that for all the trouble of splitting the tractor, replace it now, or risk having to re-split the tractor.
The shaft extending through the bearing, which does NOT move forward and back with the bearing, is the drive shaft coming from the tranny, (actually it couples to the tranny drive shaft, but to all purposes, it's the same thing).
There is no bearing or seal to worry about behind the throw-out bearing, because this shaft is a long one that extends all the way to the tranny, and you cannot reach through from the front. All you change here is the movable throw-out bearing.
Here's another pic from a different angle. The 'gear' you see is on the end of the tranny drive-shaft, and this gear extends into the clutch disc. When the clutch disc is 'grabbed' between the pressure plate and the flywheel, the clutch disc 'drives' this tranny shaft, imparting power to the tranny.
And with the better view, you can see that the bearing actually sits on a 'sleeve' that slides forward and backward relative to the tranny shaft. It is this sleeve that is actually attached to the yoke.
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