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My Seiko 7015 Chrobograph Stop and Heavy When its night and time to day/date change

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Hello guys..

Why my seiko speedtimer 7015 chronograph run smoothly when its day(morning till evening)

But its stop and heavy when its time to changing the day date,whats the problem and how to fix it..

Thankyiuu

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Could be a few things. 

Is it stiff when changing the time if so it's the cannon pinion too tight.

The day or date wheels are buckled or more likely the the date drive wheel or day finger is bent and catching.

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This is the hallmark of seiko, day date jump stuck half way for the whole day and good part of yesterady and the rest of tommorow:lol:

Service may help. I have seen some with day date disconnected just to have something that runs. 

 

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