a7750 hand engagement

[hackR]

Have a chrono avenger with a7750 6-9-12 movement...on occassion, when I hack the movement to sync the time, set the time or set the date - when I push the crown all in, the seconds, run but the minute/hour hands get “stuck"....I then pull the crown out, reset or move the hands, then eventually they "engage"....it's intermittent...have had this also happen on a previous skyland...

The secs at 9 run, so it's not the hack lever...any ideas?...anyone else have this problem?

Thanks...R

[UnknownWatchmaker]

Old thread, but I am having a similar issue on a PAM 438 with the seconds hand at 9.  It was initially sticking at 11:02 for the first day, and after letting the spring discharge, it is now sticking at 5:24.  The interesting thing is that when you unscrew the crown and manually move the hands, there is a slightly increased resistance as you push the hands to 5:25, but becomes normal immediately thereafter.

I imagine it is something physically in the gears.  I am going to try blow some air through the case tomorrow and see if anything will dislodge.

Anyone with a similar issue?  Any known fixes?

[SSTEEL]

Sounds like there is a void between the underside of the dial and the movement.  Usually there is a spring washer fitted to the hour pinion to stop these gears coming loose.