Seiko 4R35A Technical Manual

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Page 1

PARTS LIST / TECHNICAL GUIDE

Automatic Cal. 4

R35A

[SPECIFICATIONS]

1/18

Item

Cal. No.

4R35A

Driving system

Additional function

Crown operation

Loss/Gain

Regulation system

Number of jewels

Normal position 1st click position

2nd click position

Lift angle of the escapment

Vibration per hour

Power reserve

Time indication

•

3 hands (hour, minute and second hands)

• Date indication

• Diameter Outside: Ø 27.4 mm Casing: Ø 27.0 mm

• Height: 5.25 mm

Movement size

Automatic winding with manual winding mechanism

• 3 hands (Hour, Minute and Small Second hands)

• Date indicator

• Date correction function

• Second hand stop function

Date setting (counterclockwise) Time setting (Hour and minute)

Manual winding (clockwise only)

21,

600 (6 beats per second)

Between + 45 and - 35 seconds

Mainspring wind up status

Testing positions

(Isochronism fault: T24-T0)

± 30 s/d

Measurement (daily rate in seconds:s/d)

Dial upward:

T0 (CH)

Daily rate worn on the wrist at t e mp er a t ur e range between 5 °C and 35 °C)

St an d a r d r a te for measurement

6 o’clock at the top

Dial upward :

T24 (CH)

9 o’clock at the top

fter 24 hours from fully wind up

Fully wind up

± 30 s/d

23 jewels

ETACHRON system

rom fully wound to stoppage: Approximately 41 hours

52 °

Second hand stop

± 20 s/d

± 30 s/d

Page 2

SPECIFICATIONS

2/18

Cal. 4R35A

FEATURES

CHARACTERISTICS OF A MECHANICAL WATCH

1. This mechanical watch operates using power obtained from a mainspring.

2. While loss/gain of a quartz watch is indicated by a monthly or annual rate, accuracy of a mechanical watch is normally indicated by a daily rate (loss/gain per day).

3. Normal usage accuracy of a mechanical watch varies according to conditions of use (time period that the watch is worn on the wrist, temperature environment, hand movement, and winding state of the mainspring).

4. When the watch is affected by strong magnetism, it temporarily gains or loses time. If the watch encounters a strong magnetic ﬁeld, the parts of the watch may be magnetized. In this case, repairs such as removal of magnetism are required.

SEIKO Automatic mechanical Cal. 4R35A is developed based on Cal. 7S series and Cal. 6R series design with two speciﬁcations as follows :

1. M

anual winding function.

2. Second hand stop function for time setting (2nd click position of the crown)

Page 3

PARTS LIST

Cal. 4R35A

3/18

Please refer to the following pages.

2 DATE DISK GUARD SCREW A (3pcs.)

0012 354

4 DATE DISK GUARD

0808 060

3 DATE DISK GUARD SCREW B

0016 705

5 DATE DISK

DATE JUMPER

0810 030

7 GUARD SCREW OF

INTERMEDIATE WHEEL FOR DATE SETTING

0012 354

8 GUARD OF INTERMEDIATE

WHEEL FOR DATE SETTING 0836 010

9 INTERMEDIATE WHEEL

FOR DATE SETTING E 0962 025

q; INTERMEDIATE WHEEL

FOR

DATE SETTING C

0962 024

qa DATE SETTING WHEEL

0737

300

qg MINUTE WHEEL 0261 006

qj CLUTCH WHEEL

0282 040

qk WINDING PINION

0283 020

ql CALENDAR

CORRECTOR

1ST INTERMEDIATE WHEEL 0962 164

DIAL HOLDING SPACER

4408 ***

qsHOUR

WHEEL

0271 483

qd DA

TE DRIVING WHEEL

0802 300

INTERMDIATE WHEEL FOR DATE DRIVING 0817 300

CANNON PINION 0225 005 (Disassemble after CENTERWHEEL)

qj qk ql

Lubricating: Types of oil

AO-3 (Moevius A)

SEIKO Watch Oil S-6

S-6

Page 4

Cal. 4R35A

PARTS LIST

4/18

Please refer to the following pages.

1 OSCILLATING WEIGHT 0509***

wf-4 STUD SUPPORT

0345021

wf-1 BALANCE COCK 0171116

wf-2

REGULATOR

0341020

wf-3 REGULATOR PIN 0033364

wj PALLET BRIDGE 0161300

wk PALLET FORK 0301009

wl AUTOMATIC TRAIN

BRIDGE SCREW (2 PCS.) 0012354

e; AUTOMATIC TRAIN

BRIDGE 0191032

ea 2ND REDUCTION WHEEL

0514010

es RACHET WHEEL SCREW

0012919

ed RACHET WHEEL

0285051

BALANCE COCK WITH

REGULATOR 0171353

wd BALANCE COCK SCREW

0012420

SHOCK ABSORBING CAP JEWEL

0011220

HOLE JEWEL FRAME FOR

SHOCK ABSORBER 0014295

BALANCE COMPLETE

0310046

PALLET BRIDGE SCREW

0012354

SHOCK ABSORBING SPRING

0014577

Lubricating: Types of oil

AO-3 (Moevius A)

SEIKO Watch Oil S-6

Page 5

PARTS LIST

Cal. 4R35A

5/18

Please refer to the following pages.

ef BARREL AND TRAIN WHEEL BRIDGE SCREW (3PCS)

0012420

r; LOWER BRIDGE FOR CROWN

WHEEL AND REDUCTION WHEEL 0436164

ej 1ST

REDUCTION WHEEL 0511010

eh BARREL AND TRAIN

WHEEL BRIDGE 0014348

el LOWER BRIDGE FOR CROWN WHEEL

AND REDUCTION WHEEL SCREW 0012354

eg SLIDING CROWN WHEEL SPRING 0363156

ra 1ST

REDUCTION WHEEL HOLDER 0836020

ek PAWL LEVER

0831077

rj THIRD

WHEEL 0231070

rk CLICK

0381004

rl BARREL COMPLETE 0201267

rs HOLD

SPRING FOR ESCAPE WHEEL

0015703

rd CAP JEWEL FOR ESCAPE WHEEL

0011221

rf HOLD SPRING FOR THIRD WHEEL

0015703

rg CENTER WHEEL BRIDGE SCREW

0012354

rh CENTER

WHEEL BRIDGE

0122302

Lubricating: Types of oil

AO-3 (Moevius A)

SEIKO Watch Oil S-6

Page 6

Cal. 4R35A

PARTS LIST

6/18

Please refer to the following pages.

t; CENTER WHEEL BRIDGE SCREW 0012354

CENTER WHEEL

(Disassemble after CANNON PINION)

CENTER WHEEL BRIDGE

0122302

ESCAPE WHEEL

0251300

tg SETTING LEVER JUMPER SCREW

(2PCS.) 0012168

tj YOKE 0384061

tk SETTING LEVER 0383060

tl STOP LEVER 0601010

th SETTING LEVER JUMPER

0388177

yf MAIN PLATE 0100493

y; CLUTCH WHEEL 0282040

ya WINDING PINION 0283020

ys CALENDAR CORRECTOR 1ST

INTERMEDIATE WHEEL 0962164

yd WINDING STEM 0351***

Lubricating: Types of oil

AO-3 (Moevius A)

SEIKO Watch Oil S-6

Page 7

PARTS LIST

Cal. 4R35A

7/18

Please refer to the following pages.

Following parts are determined based on the design of watches, such as hands height, dial color, and design of cases. Please refer to the SEIKO WATCH PARTS CATALOGUE in order to choose corresponding parts.

SCILLATING WEIGHT

The type of OSCILLATING WEIGHT is determined based on the design of cases. Check the case number and refer to the "SEIKO WATCH PARTS CATALOGUE" to choose corresponding OSCILL ATING WEIGHT.

INDING STEM 0351***

* For screw down crown models, the stem is assembled to the crown and is not available separatelly.

●

How to ﬁnd the correct parts, if not determined by 4 digit caliber number

DIAL HOLDING SPACER

Distinction point

4408 170

4408 171

DIAL HOLDING SPACER of diver’s wach has a distinction point as the above image.

●

DATE DISK

The type of DATE DISK is determined based on the design of cases. Check the case number and refer to the "SEIKO WATCH PARTS CATALOGUE" to choose corresponding DATE DISK.

Page 8

Cal. 4R35A

PARTS LIST

8/18

Please refer to the following pages.

0012 919

0012 354

e; RATCHET WHEEL SCREW

ek LOWER BRIDGE FOR CROWN WHEEL AND REDUCTION WHEEL

CREW

rg CENTER WHEEL BRIDGE SCREW P

ALLET COCK SCREW (2 pcs)

AUTOMATIC TRAIN WHEEL SCREW (2 pcs)

Parts code

Parts name

rk SETTING LEVER JUMPER SCREW (2 pcs)

es BARREL AND TRAIN WHEEL BRIDGE SCREW (3 pcs) wa BALANCE COCK SCREW

CASING CL AMP SCREW (2 pcs)

012 168

0012 420

0012 067

CROSS-SECTION VIEW OF THE SCREW PARTS

0016 705

3 DATE DISK GUARD SCREW B

Page 9

PARTS LIST

Cal. 4R35A

9/18

Please refer to the following pages.

●

Tools and consumables required for disassembling/reassembling

• Movement holder

UNIVERSAL MOVEMENT HOLDER

(S-682)

•

Watch oils

SEIKO watch grease S-6 and S-4. watch oil AO-3 (or Moebius A)

S-6

AO-3

S-4

Page 10

TECHNICAL GUIDE

Cal. 4R35A

10/18

SETTING MECHANISM

Crown position: 0 position

Push the SETTING LEVER gently (refer to the picture on the right) in order to disengage it from the SETTING S

TEM. Then pull out the crown with stem completely.

Push here

ALENDAR CORRECTOR 1ST INTERMEDIATE WHEEL

NDING PINION

LUTCH WHEEL

REMARKS ON DISASSEMBLING AND REASSEMBLING THE MOVEMENT

l HOW TO REMOVE THE SETTING STEM

BEFORE DISMANTLING THE MOVEMENT

YOKE

SETTING LEVER

TTING LEVER JUMPER

Page 11

TECHNICAL GUIDE

Cal. 4R35A

11/18

BALANCE AND ESCAPEMENT

How to disassemble /reassemble the BALANCE and BALANCE COCK

•

Disassembling

) Rotate the STUD SUPPORT until it touches to the BALANCE COCK.

When doing so, make sure that the second bend of the balance-spring does not touch the REGULATOR PIN.

) Push out the stud parallel to the slit of the STUD SUPPORT (the direction also shown by the red

arrow in the illustration) in order to remove it from the STUD SUPPORT.

) Unscrew the BALANCE COCK SCREW and remove the BALANCE COCK WITH REGULATOR.

) Remove the BALANCE COMPLETE WITH STUD.

Page 12

TECHNICAL GUIDE

Cal. 4R35A

12/18

•

Reassembling

1)Install the BALANCE COMPLETE WITH STUD to the MAIN PLATE.

2) Set the BALANCE COCK WITH REGURATOR and tighten the BALANCE COCK SCREW.

3) Temporarily set the stud to the STUD SUPPORT.

Do not engage the balance-spring to the REGULATOR PIN. The balance-spring passes outside of the REGULATOR-PIN at this stage.

4) Push back the stud parallel to the slit of the STUD SUPPORT.

5) Engage the balance-spring with the slit of the REGULATOR PIN.

* When assembling the BALANCE COMPLETE, pay great attention

not to deform the balance-spring, especially at the second bend.

Page 13

TECHNICAL GUIDE

Cal. 4R35A

13/18

HOW TO REASSEMBLE OSCILLATING WEIGHT

Enlarged view

OSCILLATING WEIGHT

When ﬁxing the OSCILLATING WEIGHT, an alignment with the FIRST REDUCTION WHEEL is necessary in order to wind the MAINSPRING most ef ﬁciently.

otate the FIRST REDUCTION WHEEL manually until its hole aligns with the gilt dot on the BALAN

CE COCK and set the OSCILLATING WEIGHT vertically at the stem side, and then tighten the screw. Refer to the ﬁgure below.

Page 14

TECHNICAL GUIDE

Cal. 4R35A

14/18

Names of the parts for regulation and their functions

[STUD SUPPORT]

Correction of the beat error by positioning the roller jewel correctly

[REGULATOR]

Regulation of the accuracy rate (+) or (-) by adjusting the operative length of the balance-spring

[STUD (glued at the balance-spring)]

Alignment of the balance-spring to the center of the regulator pin's slit

[REGULATOR PIN]

Adjustment of the play of the balancespring embraced in its slit

How to regulate the isochronism fault by adjusting the position of the balance-spring

This caliber has the Etachron system for ﬁne regulation of the isochronism fault, which is the same design used for both Cal. 7S-B series.

en an amplitude of the balance becomes weak, the watch shows time loss, in general.

By making a clearance of the balance-spring smaller, the decline curve of the instantaneous rate gets shallower.

) Make sure that the REGURATOR PIN is aligned in a vertical position to the REGURATOR and the balance-spring passes parallel through the slot of the REGULATOR PIN before ﬁne-tuning the STUD and the REGULATOR PIN.

REGULATOR PIN

top side view back side view

angled view

REGULATION

Page 15

TECHNICAL GUIDE

Cal. 4R35A

15/18

2) Rotate the STUD in order to align the position of the balance-spring passes through the center of the slot of the REGULATOR PIN.

STUD

REGULATOR PIN

3) Rotate the REGULATOR PIN counterclockwise in order to ﬁne-tune the clearance of the balance-spring passing through the slot of it.

top side view

back side view

EGULATOR PIN

top side view

Before rotating

After rotating

back side view

Before rotating

ter rotating

(Maximum clearance) (Minimum clearance)

Page 16

TECHNICAL GUIDE

Cal. 4R35A

16/18

unction check

Operation Function Checkpoint

Pull out the crown to the 2nd click and push it back in to the normal position. Repeat the same several times.

Set ting m e cha n i s m switching the function of the time setting.

Make sure that it has a click at each position and the stem is not pulled off.

Tu r n t h e c ro w n clo c k w i se at t he 0 click.

H a

n d w i n d i n g

function.

Make s ure that t h e mains p r ing c an b e wound by turning the crown clock wise.

Pull out the crown to the 1st click, then turn it counterclockwise.

Calendar mec hani sm

- correcting the date.

Make sure that the date changes smoothly.

Pull out the crown to the 2nd click, then turn it.

Se c on d h a n d s to p function.

Make s ur e t h a t t h e second hand stops when the crown is pulled out to the 2nd click.

Setting mechanism hour and minute hand setting.

Make sure that the hour and minute hands move s m oo t hl y ( w i t ho u t touching each other or touching the surface of the dial or inside of the glass).

nds installation.

calendar mechanism

- date change.

Make sure that the date changes when the hour and minute hands pass around midnight.

Page 17

TECHNICAL GUIDE

Cal. 4R35A

17/18

Marking on the case back Test method Applied pressure

WATER RESISTANT (WATER RESIST)

3 BAR

WATER RESIST 5BAR 5 BAR

WATER RESIST 10BAR 10 BAR

WATER RESIST 15BAR 15 BAR

WATER RESIST 20BAR 20 BAR

SCUBA DIVER'S (AIR DIVER'S) 150 m 18.75 BAR = 150 (m) times 0.125

SCUBA DIVER'S (AIR DIVER'S) 200 m 25 BAR = 200 (m) times 0.125

He-GAS DIVER'S 300 m 37.5 BAR = 300 (m) times 0.125

He-GAS DIVER'S 600 m 75 BAR = 600 (m) times 0.125

He-GAS DIVER'S 1000 m 125 BAR = 1000 (m) times 0.125

Check the water resistance according to the designated speciﬁcation of the watch.

Water resistance test

Water pressure test

Condensation test

Water pressure test

Air leak test

Page 18

TECHNICAL GUIDE

Cal. 4R35A

18/18

Measure the rate in three different positions within 30 minutes after the watch is fully wound up (wait approximately for 5 minutes after winding up in order to get a stable oscillation of the balance) and make sure the value shows within the range in the table below.

Measure the rate in dial-up position af ter 24 hours from fully wound up (T24) and check the rate difference with the rate in dial-up position when it is fully wound up (T0). Make sure that the value of T24-T0 shows within the range of the isochronism in the table below.

v T

he accuracy of mechanical watches is indicated by the daily rates of one week or so.

v T

he accuracy of mechanical watches may not fall within the speciﬁed range of time accuracy because of loss /gain changes due to the conditions of use, such as the length of time during which the watch is worn on the wrist, arm movement, whether the mainspring is wound up fully or not, etc.

v The key components in mechanical watches are made of metals which expand or contract depending on

temperatures due to metal properties. This exerts an effect on the accuracy of the watches. Mechanical watches tend to lose time at high temperatures while they tend to gain time at low temperatures.

v I

n order to improve accuracy, it is important to regularly supply energy to the balance that controls the speed of the gears. The driving force of the mainspring that powers mechanical watches varies b

etween when it is fully wound and immediately before it is unwound. As the mainspring unwinds,

the force weakens.

v Relatively steady accuracy can be obtained by wearing the watch on the wrist frequently for the self-

winding type and winding up the mainspring fully everyday at a ﬁxed time to move it regularly for the wind-up mechanical type.

When affected by external strong magnetism, a mechanical watch may loss/gain time temporarily. The parts of the watch may become magnetized depending on the extent of the effect. In such a case, consult the retailer from whom the watch was purchased since the watch requires repair, including demagnetizing.

Standard rate

for

measurement

Mainspring

wind up status

Fully wind up (T0)

ter 24 hours from fully wind up (T24)

Testing

positions

al upwards :

T0 (CH)

6 o'clock at the top

9 o'clock at the top

al upwards : T24 (CH)

Measurement

(daily rate in

seconds:s /d)

±20 s /d ±30 s/d ±30 s/d

( I s ochr o n i s m faul t : T 24-T0) ±30 s/d

Duration time test

Check the Power reserve of the watch after the mainspring is fully wound up and leave it oon natural condition with the dial-up position. Make sure that the watch runs approximately 41 hours until it stops.

Accuracy test

ACCURACY OF MECHANICAL WATCHES