Here's some of the advice I followed on Fri. when I replaced mine.......http://www.oldfordtractors.com/rep.htm
Click on the Front king pin link.
Once i got it so it would move side to side reasonably easily, I used a slide hammer to pull it out. Wasn't hard at all.
There is also a How-To on the 'other' 8N forum that uses a threaded rod to pull the pin out. This post was edited by mbramble at 06:35:39 03/11/13.