Yes the PRO 52 has a 71mm wheel. This is an HX52 same thing smaller wheel. Both have the same shaft and the same problem with the nut backing off. Once its pinned I here they are great unless you over speed them running no WG. But this one Im talking about I guess is a freak thing. My best guess is somthing hit the wheel, dont know what or how as it was running a filter and should have been clean inside the box, but anything is possible.
Yes they are on the Volvo engines, seen hundreds at work on skids and in the scrap room due to something stupid like a dented compessor housing or exh flange. I work at the powertrain plant in Hagerstown MD. Another charger that looked good was a Garrett that they used for over seas non emessions engines but I dont remember the part #s.