Author Topic: Service: Breitling Shark A53605 Chronograph B53 (ETA 251.262)  (Read 3313 times)

kanikune

  • Administrator
  • Full Member
  • *****
  • Posts: 113
  • Karma: 0
Service: Breitling Shark A53605 Chronograph B53 (ETA 251.262)
« on: November 14, 2015, 11:58:10 PM »
I bought this Breitling screaming for a service, because I wanted to get familiar with ETAs premium Quartz chronograph movement, 251.262. Movement works ok mostly, but the chrono minute hand has jammed in the 45 minute position. Also chrono reset button had jammed.


The movement is officially Breitlign B53. Aside normal time setting and chronograph functions movement has hour hand quick set, which also makes the date manipulation faster.


The first great challenge was to loose the chrono pushers. Lot of gunk had built inside and reset button needed light hammering to get out. I don't know if this is duw to over greasing in the past or natural built up due time. The sapphire crystal had also bid dent, so new one was replaced.


Chrono pusher axles take 2 o-rings.


Fullwind to full entropy. On the top right rotors are stuck in the Rodico.


After cleaning keyless works back together.


Assembling the setting lever bridge was little something, as the setting is spring loaded.


On the picture at 12 o'clock date wheel driving wheel. In the center there is two-layered hour wheel. The two layers are separated with mechanical claws that click at 90 degree intervals. This is for the hour hand quick set. I have seen previously this done by magnets in Omega quartz movements.


Now comes the main circuit. Chrono circuit puhers are on the left. (Case pushers have their own return springs). When the circuit pusher is pushed, pusher circuit is closed and function is registered by the logic.


Hacking lever. This has two functions when the crown is pulled to time setting mode. 1st it electrically shuts down the time train and 2nd mechanically holds the time train wheel, so that second hand stays put.


On top of the main circuit comes cover bridge. Also stators, rotors and coils are in place.


Something little different. The white guu is probably silicone and it has vertical thin copper wires inside. The purpose of this block is to connect main circuit to circuit extension. The outer black part holds white part in place.


This movement has following hands on the center. Chrono seconds, chrono minutes, normal hour nad minute hand. So 4 hands stacked. Because of this 3 functions are piled very closely: time train, chrono minute and chrono seconds. Notice the hacking lever sticking out of the cover bridge. Chrono minute driving wheel had long fiber curled around it, which have probably entered the case during battery replacement.


This was not easy task, as there is three wobbly manetic rotors and bunch of wheels that all need to align under this bridge.


Placed succesfully. Here only secured by 2 screws as chrono second wheel & bridge is secured later with two screws.


Here upper small hand drivers.


Chrono second hand wheel & bridge back together.


Circuit extension, which connects stepper motors to main circuit.


On top of aforementioned comes the movement cover.


Dial side of the movement is very simple. Only date wheel with 3 holders are screwed in.


Stacked chrono hands are nice, as the other hides nicely when the chrono is not in operation.


Here chrono is stopped at 3.4 seconds and chrono minute hand is visible.


Now that everything works this is indeed one great watch. The bracelet has safety lock and diver's extension.
« Last Edit: January 03, 2016, 12:55:14 AM by kanikune »

kanikune

  • Administrator
  • Full Member
  • *****
  • Posts: 113
  • Karma: 0
Re: Service: Breitling Shark A53605 Chronograph B53 (ETA 251.262)
« Reply #1 on: January 03, 2016, 11:05:05 AM »
You can buy this watch now:
http://www.ebay.co.uk/itm/321965150477

Aparicio

  • Newbie
  • *
  • Posts: 2
  • Karma: 0
Re: Service: Breitling Shark A53605 Chronograph B53 (ETA 251.262)
« Reply #2 on: February 12, 2018, 12:31:40 PM »
I want to know the source of this information.

kanikune

  • Administrator
  • Full Member
  • *****
  • Posts: 113
  • Karma: 0
Re: Service: Breitling Shark A53605 Chronograph B53 (ETA 251.262)
« Reply #3 on: February 12, 2018, 09:23:05 PM »
Just google "ETA 251.262 pdf" and you'll find manual for this caliber. Other than that, you need to be more specific what you want to know about this. :)