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Posted

Hello, I'm working on an ETA 2752. The watch showed the following behavior: About 30 minutes before date-change the minute and hour hand stopped, but the second hand continued to run. Manual date change was possible. I think the reason is very low to zero friction in the cannon pinion with driving wheel.

IMG_3228.thumb.jpg.26f95e8d0faf06e8369d6d219cf488f7.jpg

 

Is it possible to increase friction in this part? How? Or do I have to look for a spare part? Thank you for any input.

Posted

This design is common on ETAs and I've had the same problem.

You need to separate the parts and then, with a suitably sized screwdriver, insert the blade in the gap underneath eavh of the three curved attachment points on the wheel in turn and gently twist the screwdriver slightly to bring each point in closer to the centre.

This process will increase the friction ... but remember gently and slightly are the key words here! Reattach parts with a suitable bit from a staking set.

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