OK...so you want to keep the mower so my opinion that the older pitman mowers are interesting only for show restorations and swim raft anchors is not wanted.
JD mowers of that age, and my experience is with the semi-mounted #5 mowers (thinking yours is likely similar), had two cups that clamped over a ball on the end of the knife. Balls may or may not have zerks in them...seen both. Cups are held on tight with a "T" shaped part (fork) that has a heavy coil spring on it's shaft. Make sure it is all there and the spring is holding tight. Cups and knife balls can wear out. I have seen cups worn to a knife like edge. My best luck has been with good cups and the ball with the zerk. Check your parts for wear and get the manual and make sure it is set up right and sharp so that you are not overstressing the joint. HTH, Dave.
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