Tag Heuer. ETA Valjoux 7750 Service
Watch Services
Updated On: July 11, 2011Tags: 7750, ETA, servicing, TAG Heuer, Valjoux, valjoux 7750, watch repairs —
The ETA Valoux 7750 is a very popular movement found in TAG Heuer, Breitling, Omega, IWC, Panerai and many other luxury brand watches.
It is recommended to service this movement every 3 – 5 years.
This watch requires a specific stripping proceedure starting with the ocsillating weight, the dial then the calendar works, followed by the chronograph and autmatic works. Followed by the escapement and train of wheels and then the keyless winding mechanism.
Once stripped the watch is ultrasonicaly cleaned and then assembled following a very specific oiling regime. Special synthetic oils are used, standard watch and clock oil will not do.
We start by removing the dial and hands.
We need to remove the Ocsillating weight.
Now we work on removing the calendar work.
With the dial off, the calendar work is exposed.
Now ready to remove the calendar ring and we unscrew the plate it sits on to reveal the hour recording mechanism, the keyless mechanism and the rest of the calendar works.
Once the components are removed we can then start to dismantle the chronograph and auto mechanism.
Removing the tension springs.
Now we remove the plate to expose the chronograph and auto mechanism..
We can see debris on the chronograph runner wheel and the auto reversing wheel…
Most of the chronograph section is dismantled.
Notice to wear and tear:
This is the train of wheels and the big wheel on the left houses the mainspring (we call this the Barrel).
Removing the keyless work winding mechanism.
This is the watch fully stripped – click on the image to make it bigger.
Hi. This sounds like I could beat that quote.
Comment by admin — July 30, 2011 @ 5:23 pm
Just a brief message to give you some feedback on the Tag. I have worn the watch for 4 days last week (off at night). Totally amazed by the accuracy of time keeping you have achieved. I set the watch to the correct time (radio adjusted clock). Using the atomic radio clock as a reference the watch lost only 8 seconds over 36 hours. It was always a fairly accurate watch from new, but not to this level.
Of course the main reason for seeking your assistance being the damaged thread on the crown screw-down. I like many had ignored the idea of a service requirement, possibly thinking that the watch is working so it must be ok. However the images showing the debris and wear were a surprise. What I hadn’t noticed, but can relate to in hindsight now is that the watch had begun to struggle to re-start from a flat or wound down state. However since the service only the slightest of agitation to activate the auto winder and the second hand begins to move.
I did think that I had a problem last night after letting the watch flatten over the weekend. This as this was the first time since getting the watch back that I needed to move the date wheel. Placing the crown on the first stage the date failed to operate? However the time was about 9.30pm. I moved the time back a few hours and the date then operated fine. I’m not sure if this is due to the time being closer to auto date change or indeed if repositioning the crown and back helped. I didn’t mess about trying again. Would you think the time will affect this?
Anyhow just a note to say thanks again for the repair and service. I would have no reservation in recommending you or indeed bringing any of my pieces to you in the future. Many people, like myself get attached to their watches and in turn are cautious about handing them to the repair shop. Whilst I was lucky that you are very local to me I think many would be happier entrusting into your care. I was grateful of the time you took to explain and keep me updated. Certainly the images you took and sent were very good.
Once again many thanks
Comment by Darren — August 8, 2011 @ 10:30 pm
Thanks for the kind feedback Darren.
In relation to the manual date change – this should not be operated
during the changeover on any watch as damage could occur.
Comment by admin — August 20, 2011 @ 7:00 am