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Hamilton 974 Hands Not Moving

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I have this Hamilton 974 pocket watch. It is running strong however the minute hand move stops at 12:05 everytime it is set at 12 o'clock (the watch keeps running after the hand stops). I've replaced the cannon pinion, and the center wheel (center wheel was a tiny bit bent which I thought was the problem). I've watched it running and all of the train wheels are moving but the hands are still stopped. Any ideas?

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24 minutes ago, Nucejoe said:

Have you tested the hand tubes for binding, just remove the hands, see if stops at 12.05 . 

Canon pinion rubbing on mainplate? 

 

The watch never stops, just the minute and hour hands at 12:05 (seconds hand still tics). I've replaced the hour wheel as well and the cannon pinion isn't rubbing. I can't understand why they would move for 5 minutes and then stop every time even though it still runs. If something was binding I would think it would stop the whole watch?

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I think this is possible if there is very low friction to the cannon pinion. The balance and the trainwheels run but the cannon pinion and all following wheels and the hands do not as one of these parts is stuck somehow. 

 

I would try and analyze step by step. Take of dial, hands, hour wheel and intermediate wheel, put the minute hand on the cannon pinion and observe.

If the minute hand does not stop at 12.05 take the next step and add the intermediate wheel and observe. After that add the hour wheel and so on until you find the step where the error occurs.

 

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I figured it out. I totally overlooked that this particular 974 has the little blue locking screw to lock it in the winding position when out of the case which explains why the hands wouldn't move. I didn't have it locked which kept it in the setting position when out of the case and thus not having enough power to turn the hands....I'm an idiot :biggrin:

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A lot of Walthams have a mechanism like that. It is a little sliding lever that actuates what they call the shipper. The lever sets into a narrow groove on the top side of the pillar-plate. I was unaware of the Hamilton using such a feature. Nice that you figured it out. Cheers.

 

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