Seiko 5Y85A, 5Y89A Technical Manual

1

PARTS CATALOGUE / TECHNICAL GUIDE

Cal. 5Y85A/5Y89A

[SPECIFICATIONS]

Cal. No.

Item

5Y85A 5Y89A

Movement

(x 1.0)The illustrations refer to Cal. 5Y89A.

Movement
size

ø 24.0 mm

21.5 mm between 3 o’clock and 9 o’clock sides

21.5 mm between 6 o’clock and 12 o’clock sides
ø 23.3 mm

21.3 mm between 3 o’clock and 9 o’clock sides

21.5 mm between 6 o’clock and 12 o’clock sides

Time indication

3 hands (hour, minute and second hands)

Outside diameter

Casing diameter

Height

3.05 mm (Including battery portion)

Driving system

Additional mechanism

Loss/gain

Monthly rate within normal temperature range: less than 20 seconds

Regulation system

Nil

Measuring gate by quartz tester

Use 10-second gate

SEIKO SR916SW

Battery

Battery No.

Voltage

1.55 V

Battery life

Approximately 3 years

Jewels

1 jewel

Step motor (Load compensated driving pulse type)

• Day calendar

• Instant setting divice for day calendar

•Date calendar

•Electronic circuit reset switch

• Train wheel setting device

• 24 hour dial disk

PARTS CATALOGUE

Cal. 5Y85A/5Y89A

2

Please see the remarks on the following pages.
Lubricating of some parts is shown in “II. REMARKS ON DISASSEMBLING AND REASSEMBLING”.

Disassembling procedures Figs. : 1 46
Reassembling procedures Figs. : 46 1
Lubricating : Types of oil Oil quantity

Moebius A
Moebius F
SEIKO Watch Oil S-6

Normal quantity

Large quantity

9 Date driving wheel

0802 535

10 Intermediate date wheel A

0802 535 (For 5Y85A only)

11 Intermediate date wheel B

0158 540 (For 5Y85A only)

12 24-hour hand wheel

0157 540

13 Day driving wheel

0802 570

14 Day wheel

1002 549 (5Y85A)
1002 538 (5Y89A)

18 Date dial guard screw

0022 248

19 Hour wheel guard

0376 549 (5Y85A)
0376 540 (5Y89A)

24 Hour wheel

0271 538

2 Hour, minute and second hands

5 Date hand
6Dial

8 Calendar mechanism plate

0839 549 (5Y85A)
0839 543 (5Y89A)

15 Date star

0970 538

16 Date corrector setting wheel

0804 570

17 Intermediate date wheel

0817 570

20 Calendar corrector setting wheel

0737 530

21 Intermediate wheel for calendar correction C

0962 531 (For 5Y85A only)

22 Intermediate wheel for calendar correction B

0962 531 (For 5Y85A only)

23 Intermediate wheel for calendar correction A

0962 531 (For 5Y85A only)

1 Case ring

4 Day hand
3 24-hour hand

5Y85A/5Y89A

The illustration below is based on the Cal. 5Y89A. The
exclusive parts for the Cal. 5Y85A are additionally
indicated.

Remarks

Some parts have different parts codes between the
Cal. 5Y85A and Cal. 5Y89A. Some parts are used only
for the Cal.5Y85A.

7 Date dial guard screw

0022 230

PARTS CATALOGUE

Cal. 5Y85A/5Y89A

3

Please see the remarks on the following pages.
Lubricating of some parts is shown in “II. REMARKS ON DISASSEMBLING AND REASSEMBLING”.

28 Circuit block

4001 748

39 Rotor stator

4239 530

25 Battery

26 Battery connection (+) screw

0012 354

27 Battery connection (+)

4268 547 (5Y85A)
4271 552 (5Y89A)

29 Coil block screw

0012 354

30 Coil block

4002 531

31 Battery connection (-)

4270 531

32 Train wheel bridge screw

0012 354

33 Train wheel bridge

0125 530

34 Fourth wheel & pinion

0241 537

35 Third wheel & pinion

0231 530

36 Fifth wheel & pinion

0701 530

37 Train wheel setting lever

0391 530

38 Step rotor

4146 531

40 Minute wheel

0261 530

41 Center wheel & pinion

0221 537

42 Yoke

0384 530

43 Setting lever

0383 530

44 Setting wheel

0281 530

45 Clutch wheel

0282 530

5Y85A/5Y89A

The parts shown below are the common parts except for 27 Battery connection (+).

46 Winding stem

0354 530