Hello, I had to get to the left side hydrostatic pump to tighten one of the large hydraulic motor fittings from leaking at the pump. To get access, I removed the centering bracket and the front hub that holds the teflon bushing. Not a fun repair! Anyway, the hub (#6562063) is keyed and went on easily when I was putting everything back together. Now,I find the hub is working itself off the pintle shaft and I do not see any type of clip or retainer to keep it in place. I checked both the service and parts manual for a part I may be missing, but can't determine what retains the hub other than the key. Anybody have an idea to fix this annoying situation? Hope Tazza is listening as he has corrected past issues with my old 743. Thanks, Tom