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Khan

Valjoux 7733 Service

Question

Hello

I have for a long time been excited about servicing a chronograph. Are there any cautions I should be aware of? I'm pretty much used to service different manual and automatic swiss movements. I can't find a video or manual for disassembly procedure. What movement is it familiar with? 

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The 7733 is a pretty easy chrono, especially with a the tech sheets. The thing I've seen that trips people up is the start/stop lever is pivoted and on two planes, and has an integral spring. It can seem counterintuitive to get in place correctly so pay attention when disassembling how it's setup.

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Here are some pics I took on a 7734 (7733 is the same just without date). And I agree that the start stop lever is really tricky. Before disassembly have a close look from the side, keep the layering in mind and take some photos. 

 

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Hi again! 

Regarding chronograph runner:

I managed to take the movement apart and assemble it, thanks to the knowledge shared and available. It runs like a dream without engaging the chrono. When chrono starts, it still runs good for 10-20 sec. And stops immediately. I can't see what's preventing it to run. The train wheels should be aligned enough. No lubrication in forth wheel, minute runner and sliding gear wheel. A drop of 9010 on top of chrono runner and lower pivot. It's black on the pivot shaft, is it worn out (teeth seems intact)? And should I use 9501 on the chrono and minute runner contact area? Its shown in service manual but not mentioned elsewhere here. 

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Edited by Khan

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