Seiko 4S77A Installationshandbuch

PARTS CATALOGUE/TECHNICALGUIDE

[SPECIFICATIONS]

Movement

Item

Cal. No.

Brand CREDOR

4S77A

Cal. 4S77A

Movement size

(x 1.0)

Casing diameter

Outside diameter

Height

ø26.0 mm

ø25.6 mm

5.38 mm

Time indication Three hands (Hour, minute and second hands)

with 24-hour, date and day hands

Vibrations per hour 28,800 (8 beats per second)

Additional mechanism •Automatic winding (with auxiliary hand winding mechanism)

•Calendar indicated by hands (Date and day of the week)

•Instant setting device for date and day calendar

•24-hour hand

•Independent adjustment of hour hand

•Micro-regulating device

•Second setting device

•Regulating device by micro-positioning regulator pin

Loss/gain Daily rate at normal temperature range: Within a range between

+15 seconds and -10 seconds

Jewels 28 jewels

PARTS CATALOGUE

Disassembling procedures Figs. : 1 ~ 80

Reassembling procedures Figs. : 80 ~ 1

Lubricating: Types of oil Oil quantity

Liberal quantity

Normal quantity

Extremely small

➡➡Please see the remarks on the following pages.

Cal. 4S77A

Moebius V

Moebius A

SEIKO Watch Oil S-6

SEIKO Watch Oil S-4

SEIKO Watch Oil S-3

1 Hour, minute and

second hands

2 Date hand

1 24-hour hand

2 Day hand

10 0012 354

Auxiliary train wheel

bridge screw

11 0126 116

Auxiliary train

wheel bridge

4 Dial

12 0165 002

Small hour hand

corrector lever

18 0817 035

Intermediate small hour hand

corrector wheel and pinion

19 0281 077

Small hour hand

corrector setting wheel

20 0898 001

Day indicator driving wheel

21 0165 002

Small hour hand wheel

23 0817 036

Intermediate small hour

hand hand wheel and pinion

24 0802 029

Date driving wheel

25 0810 003

Date jumper

26 0981 008

Date star

29 0012 354

Setting lever spring screw

30 0388 021

Setting lever spring

31 0383 176

Small hour hand corrector

setting lever

32 0384 890

Small hour hand corrector yoke

13 0585 014

Hammer

14 1019 077

Day wheel

15 0817 029

Intermediate day driving wheel

16 0989 027

Intermediate wheel for

day corrector B

17 0989 026

Intermediate wheel

for day corrector A

27 0804 001

Intermediate date corrector

setting wheel A

28 0804 002

Intermediate date corrector

setting wheel B

34 Small hour hand corrector

winding stem

33 0282 077

Small hour hand corrector

clutch wheel

22 Hour wheel

➡➡Please see the remarks on the following pages.

5 0509 108

Oscillating weight with

ball bearing

6 0012 744

Screw for framework for

automatic device (2 pcs.)

PARTS CATALOGUE Cal. 4S77A

7 Framework for automatic device

3 0013 975

(Dial leg pin)*

0429 001

(Support for second reduction

wheel and pinion)

0514 003

(Second reduction wheel

and pinion)*

* The dial leg pin and second reduction wheel

and pinion cannot be disassembled as they

are fixed to the main plate.

Diashock

51 0012 284

Balance cock

screw

43 0012 513

Rachet wheel screw

(left-hand thread)

44 0285 023

Rachet wheel

69 0251 018

Escape wheel and pinion

66 0851 002

Second reverser idler

64 0012 285

Center wheel bridge screw

(2 pcs.)

61 Second wheel pinion

59 0012 673

Screw for friction spring for

second wheel pinion

Diafix

70 Center wheel and pinion

with cannon pinion

63 0201 275

Complete barrel with mainspring

65 0122 030

Center wheel bridge

57 0112 284

Barrel and train wheel bridge

56 0012 284

Screw for barrel and train

wheel bridge (3 pcs.)

8 0531 003

Differential wheel and pinion

9 0511 004

First reduction wheel and pinion

52 0171 076

Balance

cock

0310 034

Balance complete

with stud

53 0012 285

Pallet cock screw

54 0161 030

Pallet cock

55 0301 012

Jewelled pallet

fork and staff

Moebius A

0390 005

Setting lever axle

68 0391 006

Train wheel setting lever

67 0361 002

Train wheel setting lever spring

62 0231 012

Third wheel and pinion

58 0241 016

Fourth wheel and pinion

60 0396 003

Friction spring for second

wheel pinion

➡➡Please see the remarks on the following pages.

PARTS CATALOGUE Cal. 4S77A

36 0012 820

Auxiliary plate screw (A)

35 0012 201

Auxiliary plate screw (B)

37 0102 117

Auxiliary plate

38 0387 007

Minute wheel bridge

39 Cannon pinion

46 0012 820

Date jumper guard screw

47 0809 001

Date jumper

73 0384 023

Yoke

Diafix

Diashock

80 Main plate

77 Winding

stem

76 0381 010

Click

75 0012 672

Click screw

74 0383 024

Setting lever

72 0388 006

Setting lever spring

78 0283 006

Winding pinion

79 0282 031

Clutch wheel

71 0012 354

Setting lever spring screw

50 0390 116

Setting lever axle

(for small hour hand

corrector)

49 4408 189

Auxiliary plate spacer

48 0981 008

Day/date corrector wheel

rocker

45 0363 003

Sliding crown wheel

spring

42 0286 003

Sliding crown wheel

41 0261 009

Minute wheel and pinion

40 0281 076

Setting wheel

44 0285 023

Rachet wheel

43 0012 513

Rachet wheel screw

(left-hand thread)

(Crown wheel)

PARTS CATALOGUE

•List of screws

• Stud screw • Click screw

0012 121 0012 672

0012 284 0012 673

0012 285

• Yoke holder screw

• Auxiliary train wheel

bridge screw

• Setting lever spring

screw

0012 726

0012 354

• Rachet wheel screw

0012 744

0012 513

• Auxiliary plate screw (A)

• Date jumper guard

screw

0012 201

0012 820

NamePart No.NamePart No.

Cal. 4S77A

• Casing clamp screw

• Screw for barrel and train

wheel bridge

• Balance cock screw

• Screw for friction spring

for second wheel pinion

• Center wheel bridge

screw

• Pallet cock screw

• Auxiliary plate screw (B)

• Screw for framework for

automatic device

PARTS CATALOGUE Cal. 4S77A

•List of jewels

0011 540

• Lower hole jewel for fourth wheel

and pinion

0011 505

0011 541

0011 151

0011 422

0011 157

•List of tubes and pins

0032 165

Part No. Name Part No. Name

• Diashock upper/lower cap jewel

• Diafix upper cap jewel for fourth

wheel and pinion

• Diafix upper/lower cap jewel for

escape wheel and pinion

0011 221 • Upper/lower hole jewel for third

wheel and pinion

• Upper hole jewel for complete

barrel with mainspring

0011 398

• Upper hole jewel for center wheel

and pinion

0011 715

• Lower hole jewel for center wheel

and pinion

0011 146

0013 934 • Micro adjuster pin

• Dial leg pin

0013 975

• Upper/lower hole jewel for jewelled

pallet fork and staff

• Upper/lower hole jewel for first

reduction wheel and pinion

• Upper hole jewel for differential

wheel and pinion

• Lower hole jewel for differential

wheel and pinion

0013 481 • Pin for second reduction wheel

and pinion

0032 166 • Tube for auxiliary train wheel bridge

• Tube for balance cock (B)

0344 080

Part No. Part No. NameName

•Other parts

• Regulator pointer

0345 010 • Stud holder

0468 003 • Lower hole jewel with frame for

jewelled pallet fork and staff

0014 603 • Diashock upper frame

0341 016 • Regulator

0014 605 • Diashock upper/lower hole jewel

with frame

0014 317 • Diashock upper/lower spring

0014 417 • Diafix upper spring for fourth wheel

and pinion

• Diafix upper spring for escape

wheel and pinion

0014 634 • Diashock lower frame

0015 513 • Diafix lower spring for escape

wheel and pinion

0015 721 • Diafix upper hole jewel with frame

for fourth wheel and pinion

0015 161 • Diafix upper hole jewel with frame

for escape wheel and pinion

0015 531 • Diafix lower hole jewel with frame

for escape wheel and pinion

PARTS CATALOGUE Cal. 4S77A

7 Framework for automatic device

22 Hour wheel

61 Second wheel pinion

70 Center wheel and pinion

•Discrimination of the hand installation height

Cal. 4S77A watches have numerals printed on the dial and movement to indicate the hand installation

height. When repairing, refer to the tables below.

Height Short type

Discrimination 1

Ex.) Short typeEx.) Short type

Printed position

Printed on Dial Movement

Numeral for

discrimination

Please see the numeral

printed on the movement.

The type of winding stem is determined based on the design of cases. Check the case number and refer to

“SEIKO Casing Parts Catalogue” to choose a corresponding winding stem.

77 Winding stem 0354 132

Hour wheel

Second wheel

pinion

Center wheel and

pinion with cannon

pinion

Framework for

automatic device

Numeral for

discrimination

0191 270 0224 288 0245 017 0271 487

(short type)

Please see the rightmost

numeral printed on the dial.

TECHNICAL GUIDE Cal. 4S77A

I. REMARKS ON DISASSEMBLING AND REASSEMBLING

•The explanation here is only for the particular points of Cal. 4S77A.

●How to install the hands

1 24-hour hand

Install the 24-hour hand so that its center is

positioned within the range indicated in the

illustration at right.

Within 3°on both sides

of the center of

the hour marker

➪

2 Date hand

Install the date hand so that its center is

positioned within the range indicated in the

illustration at right.

Within 3°on both sides

of the center of

the date marker

2 Day hand

Install the day hand so that the tip of the hand

ispositionedwithintheheightofthedaymarker

as shown in the illustration at right.

1. Adjust the day hand until the end portion of the hammer

engages with the cam of the intermediate day driving

wheel in the manner as shown in the illustration at right.

2. Install the dial.

* In doing so, take care not to move the parts from their

respective positions indicated in the illustration.

3. Install the date and day hands.

In doing so, pull out the winding stem for hour hand

adjustment at the 2 o’clock side to the first click position,

and check that the day hand does not touch the dial.

4. Pull outthe windingstem atthe 3o’clock sideto thesecond

click position, and turn it counterclockwise until the date

changes to the next.

5. Install the 24-hour hand at the “24” position and the hour,

minute and second hands at the 12 o’clock position,

respectively.

Hammer

Cam of the intermediate

day driving wheel

Checking hole of the auxiliary

train wheel bridge

Checking hole of

the auxiliary train

wheel bridge

➪

TECHNICAL GUIDE Cal. 4S77A

●Setting position of the day wheel

Slide the hammer so that it engages with the pinion of the day wheel as shown in the illustration below.

Day wheel

Hammer Intermediate day driving wheel

●Setting position of the date driving wheel and day indicator driving wheel

•Check that the notched portion of the day driving wheel aligns with a tooth of the intermediate day driving

wheel.

•Set the day driving wheel so that the midpoint between its two protrusions aligns with the center of the

hour wheel.

•Set the date driving wheel so that its protrusion aligns with the indented portion on the auxiliary plate.

•Check that the notched portion of the date driving wheel aligns with a tooth of the date star.

Intermediate day driving wheel

Day driving wheel

Check that the notched portion of

the day driving wheel aligns with a

tooth of the intermediate day

driving wheel.

Date driving wheel

Set the date driving wheel so

that its protrusion aligns with

the indented portion on the

auxiliary plate.

Indented portion

on the auxiliary plate

Date star

Date jumper

Hour wheel

Set the day driving

wheel so that the

midpoint between its

two protrusions

aligns with the center

of the hour wheel.

Check that the notched portion

of the date driving wheel aligns

with a tooth of the date star.

TECHNICAL GUIDE Cal. 4S77A

5 Oscillating weight with ball bearing

A screwdriver having a tip as shown in the illustration at right is

convenient for removing or installing the oscillating weight with

ball bearing.

•How to remove and install

9 First reduction wheel and pinion

Before removing the first reduction wheel and pinion, be sure to

unwind the mainspring. To do so, move the click in the direction

of the arrow with tweezers as shown in the illustration at right

while turning the crown gently counterclockwise. If the click is

movedwithoutturningthecrowncounterclockwise,themainspring

will be unwound forcibly all at once and may cause the mainspring

to be damaged.

•How to remove Tweezers

Click

Complete barrel

with mainspring

11 Auxiliary train wheel bridge

•Setting position

Day driving wheel

Date star Intermediate date corrector

setting wheel (A)

Small hour hand wheel

Intermediate small

hour hand corrector

wheel and pinion

Intermediate small hour hand

corrector wheel and pinionDay driving wheel Small hour hand corrector lever

Yoke

Setting lever

Small hour hand corrector

winding stem

Small hour hand corrector

setting wheel

Setting lever spring

Day wheel

Hammer

Intermediate day driving

wheel

Intermediate wheel for

day corrector (A)

Intermediate date corrector

setting wheel (B)

Date jumper

Minute wheel and pinion

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