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a7750 hand engagement?


hackR

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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

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If it hasn't been serviced, like all factory fresh A7750's, the cannon friction is virtually nil, no friction, means no drive to the hands... When you move the crown you also move the cannon gear and it "grabs" every now and then.

When properly serviced, what increases this friction? Oil? -or some mechanical tweak on assembly?

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When properly serviced, what increases this friction? Oil? -or some mechanical tweak on assembly?

The proper type of lubrication...Jisma is what I use. Pretty green in color. Allows for the right amount of friction to run the hands but not so much that it prevents the required amount of slipping to set the time via crown. Unserviced are way over oiled.

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