ETA’s training tool has a step by step guide to disassembling the movement
The movement pictured below is an ST1812, a Chinese clone of the ETA 2892.
“Dial” and hands
Dial removed
2 covers holdings the date disk removed
Date disk, date wheel, washer, hour wheel, date disk spring removed
Once the cannon pinion and its driving wheel were removed, we could see that a pinion goes through the base plate to drive it.
Cannon pinion and driving wheel
Cannon pinion and driving wheel
Keyless works
Keyless works with cover/spring removed
Yoke removed
Setting lever removed showing on top of the spring a hole that controls the 3 positions of the keyless works
Movement with rotor
The rotor cannot be removed immediately as it is attached to the automatic system from underneath
Underside of the rotor with the automatic system
Automatic system cover removed
Reverser disk
Reverser disk
Auxiliary reverser
Movement with automatic system removed
Gear train with Fourth wheel at the centre and a decentralized main wheel
Barrel bridge
Underside of the barrel bridge
Gear train with the long pinion of the escape wheel reaching to the fourth wheel
The mainspring barrel drives the large pinion of the main wheel
Notice the small hole in the base plate where the third wheel pinion will both mesh with the main wheel on this side and with the driving wheel on the dial side
Barrel and main wheel removed to show the third wheel pinion in positino
Fourth wheel
Third wheel
Main wheel
Balance wheel and regulator
Escapement with the Swiss lever still under its bridge
