Hi I can't really see a good angle on the shaft picture, but it looks like the splines on the 540 Male (6 spline) are worn. Usually the area where the Push pin to hold the female coupling on, is a shallow rounded groove less that 1/2" diameter. looks like yours is worn maybe an inch long into the splines. It could be the coupling slides back and forth and fatigued the shaft when it hammers at the end of the play, somebody did something stupid before you got the tractor and bent or damaged the shaft somehow, or it's had a real heavy pto implement shaft hung on it and it cracked , I had a guy pull a pto shaft out of a Belarus tractor with a huge slip clutch hanging off an old style pto pack. With a used tractor and all that good fun you never know what really happened before you got it. Regards Robert
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