Jump to content

7750 clone working "strangely"


Recommended Posts

Hi guys,

 

So 2 days ago I had a "watch meeting" with a friend from Hawaï and at a moment he showed me his non working HUBLOT BIGBANG STEEL and hasked me if I would try to fix the problem.

The watch worked for about 15 seconds then stopped ... started again with a little shake and stopped again after 15 seconds ... really strange.

As we were in a cafe I said I could have a look later so, as he was leaving to Hawaï the day after and had already ordererd a new one, he decided to give it to me.

From the previous sentences you already know that HUBLOT is a replica ... as nobody would ever "give" a 12.000€ watch and I would never take any risk working on such a watch :blink:

So I thank him and accepted the challenge.

 

So here are pics of the watch ...

I'm not certain but the movement seems to be a decorated 7750 asian clone, modified to move the subdials

IMG_2393.thumb.JPG.6ff0dd7589b6f8c5f2bf2aa6a8fd97fe.JPG

 

IMG_2394.thumb.JPG.555aa05011608bde48c6b3902c4ca0e0.JPG

 

When back home I checked first without opening it (far from home for the WE so no tools).

I first pulled the crown to setting position then back to winding position and ... the watch started again and worked for 10/20 seconds and stopped.

As he had me he had wind a little I decided to take my chance with the chrono, that worked the same as the watch ... 10 seconds then stopped ... so I laucnhed it again, stopped it instantly and reset.

Then I've tried to play a little with the movement, completely at random :

changed the date (2nd/quickdate position) and pass a complete month

- turned the hands (3rd/setting position) to pass 48 hours

- setted hour and date by turning the hands (3rd position)

- pushed the crown back in the 1rst/winding position

At the moment the watch started again and worked for about 12 hours then stopped (not on my wrist and put dial upside).

Yesterday evening I tried to start it again but it only worked for about 15 seconds and stopped.

 

Early this morning I decided to take my chance again and see how long it could work on my wrist.

I winded it (just a few turns of the crown) and the watch worked for 10/15 seconds.

So, still acting at random, I started/stopped/resetted the chrono and the watch started working again ... and strangely decided to keep on working.

So I've set the date and hour and put it on my wrist.

This happened around 6 o'clock in the morning.

At the moment it's 02:10 PM and the watch is on my wrist, still working well and keeping good time.

 I'll keep the watch on my wrist until 11:50 PM the I'll put it dial upside in a drawer.

Tomorrow morning I'll check how it goes ...

If it's still working then I'll try to launch/stop/reset the chrono again and check if this stop the watch or deosn't do anything.

Etc ... for a few days ... just doing tests before opening the watch.

 

So ... thank you for reading if you have gone so far :)

and if you have any idea or intuition about what going weird with that 7750 clone movement it will be really helpfull. 

Link to comment
Share on other sites

Not strange at all considering it probably didn't get any oil from the factory.
So I suppose I'll have to do a full service [emoji848]
I'll search for a technical sheet showing "where to oil" and "which oil to use" ...

Envoyé de mon Moto G (5) Plus en utilisant Tapatalk

Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • An incabloc spring? About 10p at the current price 🤣
    • Have you ever seen grease spread?  I use Molykote DX on the keyless, cannon pinion, etc and cannot imagine it spreading. Similarly, HP1300 should not be a problem, as long as you don't splash too much about.  9010 does like to travel though. I've recently re-serviced a couple of my watches I first serviced about 5 years ago. I was a bit too liberal with the oil and grease back then, but it hasn't spread everywhere. I only epilame on balance cap stones, escape wheel and pallet stones (and auto wheels if they need it).   If you use it all over, the oil might bead-up and travel even further - think of using RainX on your car windows.
    • Polish it where the old part cracked as well. Get rid of the stress-raisers.
    • Sounds great! And yes, I would use grease for the keyless as well although treating the parts with epilame would make the grease less likely to spread in the long run. Not critical but won’t hurt. My current strategy is to epilame treat all parts getting in contact with oil or grease.
    • Hello everyone, for what it's worth, here is my approach: 1. Escape wheel submerged in Epilame, then dried quickly with a hairdryer. Then the final tip of the pivots are cleaned by poking into pithwood. The logic being that the Epilame is removed at the intended contact point (to avoid any residue that may mix with the oil), but remains in the areas where oil is not supposed to spread to (further down the pivot towards the wheel). The escape wheel teeth also benefit from having Epilame to keep the 9415 in place.  2. I use a syringe to treat only the pallet stones. I suspend the pallet fork with some Rodico so that the stones hang downwards. I notably use a rather thick needle where a drop WON'T form, but rather where the Epilame liquid stays in the needle tip, which I then dip into the pallet stones. It requires some practice to get the right amount of Epilame into the needle tip, but it works for me now. This way, no drop will "jump" onto the pallet fork and potentially go all the way to the pivots.  3. I let the movement run for a few minutes without lubricating the pallet stones... to scrape off the Epilame in the intended contact "channel". Then I remove the balance again and lubricate the exit pallet stone with 3-4 successive drops. See the "channel" that forms on the pallet stone in the picture -- not so easy to see, but it's visible.       I am conflicted about the use of Epliame in balance jewel settings. My impression is that the two jewels sufficiently suspend the oil (even 9010). Apparently Rolex recommends NOT to use Epliame there (heard from a former Rolex service center watchmaker), as it could cause additional wear. Apart from that, I follow specific instructions where I can find them. E.g. the infamous Rolex reverser wheels or sometimes (parts of) the seconds wheel. Exception: I'm currently servicing an Eta 2824 and will probably ignore the service sheet that recommends treating the whole keyless works with Epilame and then using HP1300... I'll skip the Epilame and use 9504 grease.        
×
×
  • Create New...