That pto for PK was just a shaft hanging on bearings and supports off the frame center for most part. Early ones ran from Bellhousing location below with belt off the back of engine and on the flywheel, out the bottom of Hogs head as it is called and had a shut off of some mechanical type and back a bit a joint and another shaft to the rear. Newer PK with the electric pto had longer set-up to reach up front to the pto, directly below and belted. Electric switch then ran pto. I'm not sure, but think in some cases attachments could not be used with this pto in place, as they used some of same mounts?? Not real clear on that. I really think PK just made those to appeal to owners that thought every tractor should have a rear pto, even tho it was not one of their best attachments. The tillers of the times has a similar long shaft in a tube all the way up to the front pto belt areas, and would not allow both systems to be mounted then.
I now have one of last PK's and it has a rear pto, but all I have is about midway of frame back to the rear mount. I'm thinking there should be another shaft from mid point up to the pto in front, but off the back of it, that this tractor has, but not sure. Would have to look at a parts book to be sure. I'm thinking it will be coming off when I rebuild, but not sure at this time.