Setting Position Of Oscillating Weight; To Remove Winding Stem; To Wind Up The Mainspring - Seiko 8R48A Technical Manual

TECHNICAL GUIDE

11. Setting position of oscillating weight

Before assembling oscillating weight.
Match the center of oscillating weight and winding stem.
Set the hole of first reduction whell gear on the imaginary line toward balance bridge guide pin.
Note:
The procedure is necessary to maximize the performance of automatic winding.

12. To remove winding stem

1) Set winding stem to normal position.
2) Pull out winding stem while pushing "A".

13. To wind up the mainspring

The mainspring would be fully wounded up by turning Ratchet wheel screw 8 times clockwise.
• Manual winding ... Rotate crown clockwise at normal position by min 55 times. (Equal to ratchet wheel screw 8 times)
• Screwdriver winding ... Turn ratchet wheel screw 8 times clockwise.
[ Manual winding ]
Enlarged
View
Balance bridge guide pin
A
Setting lever
Winding stem
Screwdriver
21/24
[ Screwdriver winding ]
Ratchet wheel screw
Cal. 8R48A/8R49A
First reduction wheel gear
Ratchet wheel