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Giuseppe

Regulating a 7750 with Etachron

Question

I'm having some unexpected behaviour from a eta 7750 that I'm trying to regulate after servicing.

I went through service procedure using correct lubricants.
Everything went fine. Actually I have some doubt on lubrication of incabloc wich I'm not sure I did correctly since I'm afraid that too much oil was placed in one of the two stones.
The fact is that when I finished I wasn't brave enough to clean and lubricate it again ... shame on me but I felt that task to be very very difficult.

Anyway after reassembling the watch I had it at my wrist for a week and it showed a great consistency at -10 sec a day.
It'a stop grade movement and resting at night in DU, DD 9UP and 3UP positions always showed something between -14 -6

I was very happy with that result and I thought that a little regulation would have brought it to a very fine time keeping.

Then I reopened the caseback and slightly moved etachron arm, that was resting in a nearly neutral position, in the + direction.
Nothing happened (measuring with timegrapher open source app)

Did it again, another slight push.
Nothing

? ok I must have gone the wrong direction, then pushed all the way toward   - 
Nothing happened.

Ok this is annoying, all the way toward +
nothing

here I am, 
what I'm I missing?
How come moving the regulator arm from - to + does not make any variation?

I'm lost

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    • By Calvin
      Hello guys..
      I wanna ask..
      How to adjust my eta valjoux 7750 movement to be faster..
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    • By Giuseppe
      Hi,
      in order to buy appropriate spares in my attempt to service an Omega 175.0083 (7750)  I need some advice:
      1.
      I've already been suggested to replace MS:
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      Should I consider instead buying a barrel complete (assuming Barrel complete (180.1) comes with MS installed) wich supposedly comes prelubricated ?
      2.
      Attached image shows automatic device bridge with evident sign of wear from where, to my understanding, the problem orginated: a screw came off
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      ETA part is different from Omega in that the Omega is larger and partially covers hammer two function and the chronograph cam.
      Beside that and since the watch has no crystal back case I think those parts are perfectly interchangeable.
      Do I need to replace the bridge or are there alternative aproaches to this problem?
      TIA
      Giuseppe


    • By perfectkyo
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    • By matabog
      Hello!
      I am servicing my first 7750 (thank you Mark for the YT videos and Lawson for the Disassembly/Assembly walk-through).
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    • considering this is not a hacking movement i would agree with JD, if it is hacking then the crown is not seated correctly and the watch is hacking......but i will put my money on it that it has a dirty stuck mainspring vert common on these older watches i see all the time, and the seller means putting pressure on the crown as if your trying to wind the watch, that pressure basically forces energy on to the train forcing it to tick, once crown is let go the tension comes off and the watch stops. in this case the mainspring will need to be changed or cleaned, oiled, and re installed.
    • the screws support the pinions when pressing hands on. the hand being off could have just been you not pressing on perfectly. as far as clone 7750 goes they really arent top notch when compared to the eta, the chinese have no quality control and the chrono arms always have more play in them compared to the eta because of the way they are riveted together, make sure there is no play in the rivets.   but the spring is 100% your issue it may be popping out when hit the start button look at the pic i attached the spring should but up against the pinion arm. that spring pushes the arm and allows the pinion to make contact with the center wheel which makes the chrono run when you hit the start button, then pull back when stopping chrono.   also i have to ask is the rolex real? if so go spend $400 and get an official valjoux 7750. you will thank me later    
    • Tightened the canon pinion and now the watch is working perfectly.  Thank you all so much!
    • Hi sean,  Ok, A data sheet on this calib, helps . NWCCA is likely to provide us with info,s.  Help is almost on personal basis at watchrepairtalk.  I got my tools and am ready .  Regards  
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