Someone has been into the 3 pin driver before you, I see 1 bolt that is different than the other 3. Ball bushing is showing some wear, you may want to replace it while your in the neighborhood. Disk looks OK from what I can see but look for cracks up close. Again I'm not the QL guy, others know them better than I.
Edit:Check how a 5/8" shaft fits in the ball bushing, if it's sloppy change it.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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