Seconds hand pinion damage - Vostok 2409
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  1. #1
    Member Tarquin's Avatar
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    Seconds hand pinion damage - Vostok 2409

    Hi all. Have been swapping some hands about, and on one particular 2409 movement I noticed the seconds hand pinion was protruding from the H&M hand pinion which was stopping me placing the seconds hand. I tapped it very lightly with the pliers and sure enough it went back in. Placed the seconds hand which seemed to engage fine (it was 'ticking') however when I tilt the watch the seconds hand is completely lose on its pivot (while staying on the pinion) and rotates with gravity.

    Can any of you diagnose this problem, what may have happened and perhaps suggest any fix which may help me out here? I should say my watch repair skills are somewhere between limited and non-existent!


    Many thanks.

  2. #2
    Member Arizone's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    I would check the leaf spring in the center of the movement on the rear that engages the seconds hand with the gear train. Something may have come loose or worse, broken.
    MattBrace likes this.

  3. #3
    Member MattBrace's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    Arizone is correct, either you have bent the leaf spring that holds the pinion in place, or the hand is loose on the pinion, sometime the hand mounting tubes can be slack through wear or the pinion is undersize.

    I would go with the first as you say you pushed the pinion back in! the seconds pinion needs to be supported from behind when fitting the hand.

    Regards

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  5. #4
    Member Tarquin's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    Quote Originally Posted by Arizone View Post
    I would check the leaf spring in the center of the movement on the rear that engages the seconds hand with the gear train. Something may have come loose or worse, broken.
    Ok thanks. The leaf spring is the 'dog-legged' gold colour lever I think? It looks ok at first glance, perhaps some disassembly may reveal something?

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    Member Tarquin's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    Quote Originally Posted by MattBrace View Post
    Arizone is correct, either you have bent the leaf spring that holds the pinion in place, or the hand is loose on the pinion, sometime the hand mounting tubes can be slack through wear or the pinion is undersize.

    I would go with the first as you say you pushed the pinion back in! the seconds pinion needs to be supported from behind when fitting the hand.

    Regards
    Thanks. Movement shot above......does this reveal anything to you?

  7. #6
    Member MattBrace's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    Correct, you can remove it and check that the pinion gear is engaged. You can also remove the pinion if you wish and try the hand on it to see if it slips.
    The mounting tube on the seconds hand could be gently adjusted to give a better engagement on the pinion.

  8. #7
    Member Tarquin's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    Quote Originally Posted by MattBrace View Post
    Correct, you can remove it and check that the pinion gear is engaged. You can also remove the pinion if you wish and try the hand on it to see if it slips.
    The mounting tube on the seconds hand could be gently adjusted to give a better engagement on the pinion.
    Ok so, this shows the pinion gear (the small dark cog engaged with the wheel train)....right? Seems to be engaged and undamaged. Also the leaf spring appears to be straight, not bent.

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    Here's the seconds pinion from the dial side.............

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    Standing slightly proud of the main shaft. This can be removed from this side?

  9. #8
    Member Tarquin's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    I am right in thinking that this pinion shouldn't be standing proud of the shaft, right?

  10. #9
    Member Tarquin's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    Here's the profile view of the centre pinions.

    Hours and minutes attach fine. Seconds hand, slips over the pinion ok, and does 'tick' but is held above its proper position by the pinion. You can push it down but it 'springs' back up - after maybe a second or two...

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  11. #10
    Member MattBrace's Avatar
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    Re: Seconds hand pinion damage - Vostok 2409

    OK all looks intact, you must support the back side of the pinion when installing the seconds hand otherwise it will push the pinion out when your pressing the hand on.

    Yes the pinion should be raised higher than the cannon pin.

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