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Another old cuckoo clock repaired ..


Deano6974

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I recently posted an old cuckoo clock I repaired to full working order then I saw another that had the chains pulled too hard and were stuck in movement, so I stripped down removed and cleaned movement before re assembly and oiling, spent some time rubbing case parts down to bare wood and then re stained, bellows were both torn so replaced the paper on tops from a homemade template and ordered a new dial as original 70mm but decided I liked an 80mm instead so put that on anyway all in great working order and movement like new with no wear on pivot holes at all it couldn't of run for long considering its age Im guessing maybe 40's as after 1950 Im told the rear countwheel was put inside the movement.. 

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    • Thanks everyone for your helpful replies. I think between us we’ve worked out what’s going on. Next job is to have a proper look at this great wheel assembly, see if I can remove the clip and the friction fit pinion, give the bits a good clean, then put it back together with a bit of blue grease. I’ll also get the pallet fork under the microscope to see if it’s ok or been damaged. 
    • The cannon pinion (be it conventional style or what you see in this movement) should slip on its arbour so the hands can be set independently without affecting the gear train.  If there is too much friction between the cannon pinion and the second wheel, turning the hands to set them backwards can sometimes force the escape wheel teeth to overrun the pallet stones, creating the behaviour you describe. The train is running in reverse when this happens.  This can often chip the pallet stones. I’d say at least half of the watches I’ve inspected with very tight cannon pinions had chipped pallet stones. Hopefully this isn’t the case with your watch.  I’m not familiar with this movement but you need to get the friction in the cannon pinion adjusted correctly.  Hope this helps, Mark
    • Pallet fork was in. I’d had the movement running ok, and only removed the balance to flip it over and install the keyless works and date mechanism. The pallet fork wasn’t locking the gear train when hand setting - it was oscillating as the escape wheel rotated. This may have been in one direction only - can’t remember. 
    • Hi   Find attached parts/repair notes for the JLC 911,  might be useful. JLC_JLC 910, 911.pdf JLC_JLC 910, 911 Repair Notes.pdf
    • Hello and welcome to the forum Dan. Used to know Middlesboro quite well, that was twenty years plus ago. Attached a little reading to get you started. TZIllustratedGlossary.pdf
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