Problem with keyless works ETA 7750

[IanS]

Hello

 

I am reassembling a Valjoux/ETA 7750 movement and am having trouble with the keyless works. 

With the winding stem in first position, the winding pinion and sliding pinion do not engage/mesh and so I can't get it to wind. It very occasionally engages for a turn or two but then slips. 

Also, when I pull the stem to second position, it is not engaging in the notch in the setting lever jumper. 

What am I doing wrong?

Thanks for helping out a novice watch hobbyist!!

[RichardHarris123]

The only thing I can see, is the yolk seems to be a long way away from the set lever in the first photo.  A problem with the yolk spring? 

[Bonefixer]

Have you properly greased the parts? If the yoke is sticky on its post it might not move enough under the push of the spring to slide the clutch across. 
 

I had something similar once (with a much crappier movement than this) with the yoke sticking under the cover plate. 
 

Have you followed the tech sheet for reassembly and lubricating? It’s freely available. 
 

https://www.watchys.ch/index.php?controller=attachment&id_attachment=21

[Poljot]

1 hour ago, RichardHarris123 said:

The only thing I can see, is the yolk seems to be a long way away from the set lever in the first photo.  A problem with the yolk spring? 

I agree. It must be it. Perhaps, the yolk spring is not engaged properly. It appears that the setting lever spring assembly (plate) is slightly tilted / not sitting flat?

It would be nice to see a pictures without the setting lever spring assembly.

Edited April 11 by Poljot