Well, there's two kinds of PTO shafts. If you have the "quick release" grove around the circumference of the the shaft, then a quick release ORC should slip on easy as snot. Otherwise, there will be a hole through the shaft, and you have to use a spring pin ORC. This was the case with my '51 8N. To install the spring (or roll) pin ORC, you have to remove the two zirc fittings. Then slip the ORC on the PTO shaft, and pound the pin through the holes. When it is completely seated, replace the zirc fittings and add lots of grease. Now, I had heard how this process was easier said than done, and that you have to really wail on the pin to make it go in. So that is what I did. To no avail. In fact, I pretty much goobered up the pin, and it's a wonder I didn't bend my PTO shaft... Turns out, the ORC that I got from Agri-Supply was just a bit too long in the butt end, and would not go on the shaft far enough for the holes to line up properly. It looked good, until I shined a light through it. The I could tell that there was an offset. Bummer! So I took the dang ORC over to the bench grinder and ground off a quarter inch or so, until it fit. Then I did my best to straighten out the pin, and had no trouble getting it in after that. So my advice is to be very sure the holes are lined up perfectly. Then it shouldn't be too hard to get the pin to go in. Good luck! Joe
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