Hi,
Has anyone successfully repaired/rebuilt a varigrip collet closer? Mine is leaking air as expected. I need to replace the bearings in the rotary union and perhaps re-do the bronze bushing. Is there a trick to pulling these bearings? I see a shoulder on the aluminum hub, is this perhaps a threaded on retainer? I can't seem to remove it....the rotary union is currently removed from the draw bar/air cylinder. My primary interest is removing the bearings. Any suggestions?
Also, how are current modern rotary unions sealed and capable of sustaining high rpm?