Seiko 4S77A Parts Catalogue /technical Manual
1
PARTS CATALOGUE / TECHNICAL GUIDE
[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
2
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
3
➡➡
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
4
➡➡
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)
5
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
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