I am slow to reply because there are things I just don't remember. With pto input removed ta input can pull out. Coupler is usually tight on shaft and will come with shaft. Occasionally it will be loose. Careful not to drop in center of housing. Slidehammer puller should pull race. If replacing any way a cold bead of weld on inside face of race makes it easy. The seal is the foggy part. If the bore is straight through. You can pull it out and with suitable driver install new one. If there is a shoulder. It will have to be driven in and taken out the top. Have to fashion a puller from plates threaded rod to pull new one in.
I really think the bore is straight because I can not remember setting up a puller for this. I do remember welding a bead and reaching in with a hooked bar and yanking the bearing by hand.