r 31 ricoh

https://www.clipconverter.cc/es/

strip down

reassambly

DG2813

Full movement

Ball bearings visible. The rotor pivot is not totally round, which prevents it from slipping.

Rotor removed

Underside of the automatic bridge. The spring in the middle presses on the seconds pinion.

Automatic bridge removed.

Reverser wheel

Gear train

Balance cock and Incabloc

Focus on the impulse pin

Focus on the Incabloc

Gear train removed

Pinion carrying the seconds hand

Escape wheel

Fourth wheel

Third wheel with long pinion

Centre wheel

Swiss lever and its bridge

Centre wheel remaining

China 2813 Features automatic sweep second date: quickset Data 11.5''', Dm= 25.6mm, Do= 26mm H= 5.4mm F= 2.0mm T= 2.3mm 21 jewels f = 21600 A/h power reserve 44h Stem W3790 Hands 1.52 x 1.00 x 0.17mm D not further specified value from public sources. Dn nominal diameter, calculated from the value in lignes or the US size. If calculated from lignes it is normally the maximum mounting diameter, while the US size usually represents the outer diameter. Dm mounting diameter. With this diameter the movement fits into the aperture of the case or mounting frame - therefore slightly smaller than Dn. Do outer diameter, thus the largest. Most movements have a flange a little bigger than Dm, to rest on the case band or mounting frame. For odd shaped calibres accordingly two dimensions are recorded.

removing stem from DG2813 

 

 the stem removal position for the DG is in winding position, which is the same as crown pulled out, but not as far as date set or time set. Try (just for grins) gently rolling the stem clockwise (if looking directly at the crown) as you pull out. Sometimes this relieves tension on the keyless works and allows the stem to slide.

 For Miyota time set position. And gently put it back while rotating it until you fil it "fits". Trying to put it back if it has been previously extracted while in winding position will end up with the sliding pinion out of the yoke and it will need movement disassemble (date wheel and relative plate) to fix it...
 . Lift angle of 49.  Which is the correct Lift Angle for the 8215.