This is a cab tractor, HST, (in case that matters) with an issue with bearing, seals, snap rings, or something on the PTO output shaft. Removing the shaft seems to be pretty straight forward judging by the parts layout diagram. I'm just wondering about the splined coupler that shaft slides into on the inside. Is it likely to drop off when the shaft comes out, and if so is it accessible through the hole to put it back in place?