Hi. I am new to the site.  I have an 1950 88 Oliver RC that I purchased from my grandfather in-law.  I spent the winter fixing what was needed to get it ready for the spring season.  It is my first tractor and I am farming with it this year.  My question is that I replaced the clutch disks in the PTO.  When I try and take it in and out of gear it does not stop the PTO.  I took it apart and replaced the 3 small springs that keep it apart and it still does not stop.  Can someone direct me to another post or help me with this problem.  Everything inside the case seems intact and there.  Thanks in advance.
Keith