Seiko 7S25B Installer manual

PARTS CATALOGUE/TECHNICALGUIDE

Cal. 7S25B, 7S35B, 7S55B

[SPECIFICATIONS]

1/8

21,600 Hz/hour (6 beats per second)

4.9 mm

(x 1.5)

Ø 27.4 mm

Ø 27.0 mm

lAutomatic winding

lDate calendar

lDate correction function

3 hands (hour, minute and second hands)

7S25B :21 jewels

7S35B, 7S55B :23 jewels

SEIKO

7S25B 7S35B 7S55B

Cal. No.

Item

Movement

size

Time indication

Outside diameter

Casing diameter

Height

Additional mechanism

Vibration per hour

Jewels

Brand

7S25A/ 7S35A/ 7S55A 7S25B/ 7S35B/ 7S55B

Refer to “PARTS CATALOGUE/

TECHNICAL GUIDE

Cal. 7S25A,7S35A,7S55A.”

Refer to “PARTS CATALOGUE/

TECHNICAL GUIDE

Cal. 7S25B,7S35B,7S55B.”

These sections are

different from A Cal.

* Cal.7S watches are changed

from caliber “A” to caliber “B”

in October 2006 production.

According to the change, we

would like you to pay attention

to the design of the balance

s t af f w h e n repa iri ng th o s e

watches.

The difference between A

Cal.and B Cal.

function

Number of jewels

Cal. 7S25B, 7S35B, 7S55B

PARTS CATALOGUE

Disassembling procedures Figs.: 1 

Reassembling procedures Figs.:

rj

Lubricating: Types of oil Oil quantity

AO-3 (Moebius A) Liberal quantity

SEIKO Watch Oil S-6 Normal quantity

SEIKO Watch Oil S-4 Small quantity

Dial holding spacer

4408 ***

Date driving wheel

0802 300

q; Intermediate date

driving wheel

and pinion

0817 300

Lower bridge for third wheel and

pinion screw

0012 420

Lower bridge for third

wheel and pinion

0436 300

qd Cannon pinion

Minute wheel and pinion

0261 006

3Date dial guard screw A (3 pics)

0012 354

4Date dial guard screw B (1 pic)

0016 705

5Date dial maintaining plate

0808 030

1Hour, minute, and second hand

2Dial

6Date dial

0878 ***

9Hour wheel

0271 483 8Day-date corrector setting

transmission wheel

0737 300

7Date jumper

0810 030

2/8

For parts 6

and qf

, refer to “ PARTS USED DIFFER DEPENDING ON THE CASING MODEL” on page 5.

*Parts qg

and qh

are only used in the

7S35 and 7S55 watches.

Diashock

PARTS CATALOGUE Cal. 7S25B, 7S35B, 7S55B

Second reduction wheel and pinion

0514 002

Balance complete

without stud

0310 197

Ratchet wheel

0285 013

Barrel and train wheel bridge

0112 300

Pallet cock

0161 300

Pallet cock screw

0012 354

Balance

cock

0171 197

Ratchet wheel screw

0012 919

Barrel and train wheel bridge

screw

0012 420

Oscillating weight (with

ball bearing)

0509 188(7S25B)

0509 196(7S35B)

0509 198(7S55B)

Second reduction wheel and

pinion screw 0012 539

Pallet fork

0301 009

;

Balance

cock

screw

0012 420

3/8

eaFirst

reduction wheel

0511 006

esPawl lever

0831 004

Reduction wheel holder

0836 002

Diaﬁx

For parts qj , ql

, wl

and

refer to

“REMARKS ON DISASSEMBLING AND REASSEMBLING” on page 6.

For parts w;

, wa, and ws

refer to

“HOW TO REMOVE AND INSTALL THE BALANCE STAFF

” on page 7.

For parts

, refer to

“

PARTS USED DIFFER DEPENDING ON THE CASING MODEL

” on page 5.

rj Winding stem

0351 ***

edClick

0381 004

efFourth wheel & pinion

0241 010

egBarrel complete (with mainspring)

0201 024

ehThird wheel & pinion

0231 070 (7S25B)

0231 007 (7S35B, 7S55B)

ekCenterwheel bridge screw

0012 354

ejEscape wheel & pinion

0251 013

r;Centerwheel & pinion (with

cannon pinion

) 0224 078

elCenterwheel bridge

0122 300

raYoke spring screw

0012 168

rdYoke

0384 070

rfSetting lever

0383 070

rgClutch wheel

0282 070

rhIntermediate wheel for calendar

corrector

0962 008

rsYoke spring

0388 070

Diashock

Cal. 7S25B, 7S35B, 7S55B

PARTS CATALOGUE

Parts name Parts code Parts name Parts code

Upper hole jewel frame for diashock

0014 295

Upper hole jewel frame for third

wheel and pinion 0015 701

Lower hole jewel frame for diashock Upper hole jewel frame for escape

wheel and pinion 0015 711

Diashock upper frame 0014 573 Upper spring for third wheel and pin-

ion 0015 703

Diashock lower frame 0014 574 Upper spring for escape wheel and

pinion

Diashock upper spring

0014 577

Regulator 0341 020

Diashock lower spring Stud support 0345 197

SCREW PARTS

4/8

Parts code Parts name Parts code Parts name

Ratchet wheel screw

0012 919

0012 539

0012 354

0016 705

0012 420

0012 168

Second reduction wheel and

pinion screw

Date dial guard screw B

Center wheel bridge screw

Pallet cock screw

Date dial guard screw A

Balance cock screw

Barrel and train wheel

bridge screw

Lower bridge for third

wheel and pinion screw

Yoke spring screw

TECHNICAL GUIDE Cal. 7S25B, 7S35B, 7S55B

PARTS USED DIFFER DEPENDING ON THE CASING MODEL

6Date dial

0878 ***

*The date dial used differs depending on the casing model.

Dial holding spacer

4408 ***

The dial holding spacer for a diver’s watch has an identifying mark.

Identifying mark

4408 170 4408 171

* The dial holding spacer used differs depending on the casing model. Refer to "SEIKO Watch

Parts Catalogue (SEIKO WATCH SERVICE SITE)."

rj Winding stem

0351 ***

* The winding stem used differs depending on the casing model. Refer to

"SEIKO Watch Parts

Catalogue (SEIKO WATCH SERVICE SITE)."

5/8

TECHNICAL GUIDE Cal. 7S25B, 7S35B, 7S55B

I. REMARKS ON DISASSEMBLING AND REASSEMBLING

l

The following description is only applicable to 7S caliber watches.

Oscillating weight (with ball bearing)

The inside screw can be found in the inside ring

of the ball bearing. Use the big screwdriver to

screw sufﬁciently tight. When setting the oscil-

lating weight, align the hole of the ﬁrst reduction

wheel with the hole of the balance cock, and then

set the oscillating weight by tightening the inside

screw of the inside ring of the ball bearing (refer

to the right ﬁgure).

First

reduction

wheel

Balance cock

Second reduction wheel and pinion

Barrel and train wheel bridge

Before setting the barrel and train wheel bridge, set the ﬁrst reduction wheel and arbor,

pawl lever, and reduction wheel holder.

Reduction wheel holder

How to disassemble How to assemble

eaFirst

reduction wheel

Liberally lubricate the ﬁrst reduction wheel

(refer to the right ﬁgure).

6/8

Lubricate the second reduction wheel and pinion

(refer to the right ﬁgure).

TECHNICAL GUIDE Cal. 7S25B, 7S35B, 7S55B

;

- ws

:HOW TO REMOVE AND INSTALL THE BALANCE STAFF

How to remove How to install

1. Initial phase

Set the balance complete with stud and balance cock to

the main plate.

2. Move the stud support toward the balance cock until it is

attached to the balance cock.

* When doing so, make sure that the outer end of the

hairspring is not removed from the regulator arm.

3. Using sturdy tweezers, push the stud outward from the

direction of the arrow shown in the illustration until it is

removed from the stud support.

4. Remove the balance co ck and re place t he b al an ce

complete with stud with a new one.

3. Temporarily set the stud to the stud support.

Make sure that the hairspring passes outside the pin of

the regulator arm.

* Be careful so as not to damage the hairspring.

1. Initial phase

Set a new balance complete with stud to the main plate.

2. Set the balance cock and tighten the balance cock screw.

4. Using sturdy tweezers, set the stud to the stud support

and press it down.

Make sure that the outer end of the hairspring passes

through the regulator slot of the regulator arm.

* Be careful so as not to damage the hairspring.

7/8

TECHNICAL GUIDE Cal. 7S25B, 7S35B, 7S55B

HOW TO ADJUST THE HAIRSPRING

1. Names of the parts

A: Stud

B: Regulator arm

C: Regulator pin

D: Stud support

2. Rota te B to f ine -t une th e

position of the outer end of

the hairspring which passes

through the regulator slot so

that the hairspring makes the

longest diameter.

3. Rota te A to f ine -tune the

position of the outer end of

the hairspring so that the

hairspring passes through

the center of the regulator

slot.

4. Rota te B to f ine -t une th e

e f f e c t i v e l e n g t h o f t h e

ha ir sp rin g wh ic h pa sse s

through the regulator slot to

deﬁne adequate clearance.

Maximum

clearance

Minimum

clearance

23 4

Adjust the position of the hair-

spring so that it passes through

the center of the regulator slot.

Stud Stud support

Regulator arm

Regulator pin

To adjust the length of the

hairspring, rotate the regu-

lator pin only counterclock-

wise (as indicated with the

arrow). While doing so,

make sure that the hair-

spring does not lean to one

side.

Move the stud support to cor-

rectly position the roller jewel. Adjust the location of the regula-

tor arm to ﬁne-tune the length of

the hairspring.

Rotate the Regulator pin to adjust the

clearance to control the swing angle

of the hairspring.

8/8

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