How To Wind Up The Mainspring; How To Install Hands - Seiko 4R57A Technical Manual

8. How to wind up the Mainspring

The Mainspring can be fully wound either by hand or with Screwdriver.
・Manual winding ...Turn the crown clockwise at least 55 times (equal to 8 turns of the Ratchet wheel screw)
・Screwdriver winding ... Turn the Ratchet wheel screw 8 times clockwise.
[ Manual winding ]

9. How to Install hands

Place the movement on a flat metal plate or something similar.
We recommen using "Universal Movement Holder" S-682.
Be careful not to apply strong pressure to the movement.
<<Note: Power reserve hand setting>>
(1)The Mainspring should be fully wound up before installing power reserve hand.
(2)Set Power reserve hand at "F" position on the Indicator
[ HOW TO CHECK ]
TECHNICAL GUIDE
・Fully wound status
Auxiliary main plate pin
Enlarged
view
・Not fully wound status
[ Screwdriver winding ]
Screwdriver
Ratchet wheel screw
Intermediate power
reserve wheel
13/14
Cal.4R57A
Ratchet wheel
Metal plate
[ Hand setting position ]
Setting position
of power
reserve hand