Chronograph Coupling A And B Setting Position; Hour Chronograph Coupling Lever Setting Position; Second Transmission Wheel/Minute Transmission Wheel Setting Position - Seiko 8R48A Technical Manual

TECHNICAL GUIDE

3. Chronograph coupling A and B setting position

Set chronograph coupling lever A and chronograph coupling lever B
as illustrated.
42 Chronograph coupling lever B

4. Hour chronograph coupling lever setting position

Hour and minute counting wheel need to be inclined when setting.
5. Second transmission wheel and minute transmission wheel setting position.
• Second transmission wheel and minute transmission wheel should be set parallel to main plate.
• Once the second transmission wheel and minute transmission wheel are detached, be sure to replace them
with new ones instead of reusing them.
*1
Minute transmission wheel
• Make sure to parallel with the main plate.
25 Hour counting wheel
24 Minute counting wheel
26 Hour chronograph coupling lever
77 Fourth wheel and pinion
55 Second transmission wheel
56 Minute transmission wheel
81 Center wheel and pinion
Center wheel and pinion
17/24
41 Chronograph coupling lever A
47 Second counting intermediate wheel
*2
*2
Second transmission wheel
• The second transmision wheel top surface
should be set parallel with the fourth
wheel and pinion tip.
Cal. 8R48A/8R49A
*1
Fourth wheel and pinion