To get a proper and complete answer would need more of the mower deck model # as there are 31 different variations of a RCK54 deck.
But I can tell you nothing ever is pressed into place on a kubota, either a clip or a bolt bolts everything in place.
In this case most of the spindles the pulley nut and some sleeves hold everything in place, remove the nut, pulley, washer, and sleeve, then shaft will come out the bottom.
