I doubt if you'll be able to remove leaking o-ring type shaft seals without disassembling, as they're typically trapped in a groove in the housing by the shaft (or groove in the shaft within the housing). They start leaking when the shaft wears a flat spot in them and they lose their elasticity.
As far as removal of a PTO from the tranny, the six bolts holding them on just secure the PTO to the tranny, with the gasket in between. The PTO itself won't scatter its parts across the floor.
Once you have the PTO on the bench, it should be pretty easy to figure out disassembly and reassembly.
[on edit] Looking at your pic of the output end, those appear to be lip style seals, not o-rings, and you may be able to get them out with a small pry tool. The one on the output shaft may come out with that housing end and slide off the shaft (assuming you can get the key out of the way. If the seals have metal bodies, there should be numbers on them that you can use to match them up with new ones.
Last edited by klhansen; 08/30/2019 7:45 PM.
