In the engaged (or relaxed) position the fiber disc with teeth meshing with the S/G pulley basket is squeezed in between the pto belt pulley and the metal disc portion of the pto unit on the engine side.
Just like on an automotive manual transmission clutch assembly.
Except the power is being transferred from the inner diameter of the driver (S/G pulley basket) inwards to the pto belt.
The bearing should cost less than $20 so I would replace even if the old one "felt" good.
How much slop between the fiber gear and the S/G basket pockets?
If all of the teeth are there and it can only move like 1/8" back and forth in the basket pockets, I would reuse it.
The coil springs push that metal disc away from the pto belt pulley so that it does not drive the fiber disc/gear.
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