Agat/Kirovskie/Zlatoust 4282 stopwatch disassembly and repair

[szbalogh]

Receíved two stopwatch movements recently (the two on the right). One was a full movement, the other one had the barrel missing. Also had a case with a Zlatoust dial and a movement containing only the mainplates and the dial side complications. So i decided to make one working stopwatch with the older dial (lookng better in my opinion).

DONT TRY TO REMOVE THE HANDS!!!  The dial is fixed by two grub-screws found at the movement side. DONT EVEN TRY TO REMOVE THE HANDS!!! Pull upp the dial, the hands will be also lifted. You can see two hearth-shaped steel plates with a steel tube in the next picture taken from the dial side. The steel tube has a brass tube pressed on it, which actually holding the hand. The hand is riveted on the brass piece. Secured position of the hands on the hearth-shaped plate ensures that they always jups to 0 at reset. The hearth-shaped plates are spring-mounted on the wheel pinions, so if one lifting the dial the springs will let off the pinion. I wanted to change the dial so tried to remove the hands. The result is one bent second hand (the big one) and a broken minute hand. It seems that it will be a pain mounting the hands back in the proper position.

At first the movement seemed to be a complicated one, but the disassembly is pretty straightforward. 

Release the tension of the springs first by unhooking them. All of them are mounted with screws so they wont fly away. 

Then just remove the levers one by one.

The next lever has a pin for stopping the balance wheel.

And finally the column wheel. The last lever spring didnt wanted to come off so i just left it there.

There is nothing unusual on the movement side. First take off the balance assembly.

(Last chance to let down the mainspring tension!)

Then the pallet fork. 

Ratchet wheel, click, and clickspring dismounted.

The crown wheel is mounted with a spring loaded slipping plate. This is so russian... simpe and easy. 

And finally take down the three screws holding the main plate.

I would like to mention it here, that the whole thing is so ... russisan  All parts are rough and "has material in it". Pinions are thick....

I could see oil residues on the pallet staff pinion, which was cogged (where it is ususally not needed) and on one of the gear pinions. 

No sign of oil in the barrel. I could evel let it down lamely.

Nothing special at disassembly, just push down and the cover will pop off. No cleaning needed here, i will just add oil. 

Balance disassembly, pretty streightfoward. 

Yes, both end of the balance is broken. It has some "russian amount" of shellac on the impulse jewel. 

And ready for repivoting. 

Edited September 22, 2016 by szbalogh

[bobm12]

Fantastic! I've never worked on a stop watch! Keep them coming!

Cheers,

Bob

[matabog]

thank you!

[szbalogh]

Both end of the balance drilled. 0.2mm wide and 0.6mm deep holes.

[szbalogh]

Received a good lot of ~200-300 balance staffs from a friend and found some staffs for the Agat stop watch. Replaced, serviced. Now working like a charm

Still need to make a minute hand since i ruined the original one and a new crystal.

[szbalogh]

Ah and the lift angle is 48 degrees.