PARTS LIST/ TECHNICAL GUIDECal. 7S26C/7S36C

[SPECIFICATIONS]

1/11

Item Cal. No.

Driving system

Additional function

Crown operation

Regulation system

Number of jewels

Normal position

1st click position

2nd click position

Lift angle of the escapement

Vibration per hour

Power reserve

Time indication

-

23 jewels21 jewels

123

5

31

4

302928

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

l Date correction function l Day correction function

l 3 hands (hour, minute and second hands)l Date Indicatorl Day Indicator

Automatic winding mechanism

Date setting (counterclockwise)Day setting (clockwise)

Time setting (Hour and minute)

• 3 hands (hour, minute and second hands)• Dateindication• Dayindication

• Diameter Outside: Ø27.4mm Casing: Ø27.0mm

• Height: 4.9mm

Movement size

ETACHRONsystem

53 °

Fromfullywoundtostoppage:Approximately41hours

7S26C 7S36C

SEIKOAutomaticMechanicalCal.7S26C/7S36CarereplacementcaliberofCal.7S26B/7S36B.

ConstructionoftheCseriesissameasBseries,butusingnewparts.Sincethesizeofmovementissameas

Bseries,thecompletemovementcanbeassembledintothewatcheswhichoriginallyhavetheBseriesmove-

ment;however,asthepartsarenotconvertible,pleaseusetheappropriatepartsforeachcaliber.

REMARKS:PartsDifferencesBetweenBseriesandCseries

0012354

0808310

0810183

0737183

0273183

0802183

0261183

0225414

- 0012485

- 0436183

0509372 0509378

0171355

0285051

0114178

0511010

0831183

0201083

0122302

0224183

0388177

0388178

0282183

0016705

0808300

0810030

0737300

0271483

0802300

0261006

0225005

- 0012420

- 0436300

0509184 0509195

0171197

0285013

0112400

0511006

0831004

0201075

0122300

0224075

0388070

0383070

0282070

DATe DIAl GUARD sCRew

DATe DIAl GUARD

DATEJUMPER

DAY-DATECORRECTORseTTING wHeel

HOURWHEEL

DATe DRIVING wHeel

MINUTe wHeel AND PINION

CANNONPINION

SCREWFORLOWERBRIDGEFOR3RDWHEEL

ANDPINION

LOWERBRIDGEFOR3RDWHEELANDPINION

OSCILLATINGWEIGHT

BALANCECOCK

RATCHeT wHeel

BARRELANDTRAINWHEELBRIDGE

FIRSTREDUCTIONWHEEL

PAWLLEVER

BARRELCOMPLETE

CENTERWHEELBRIDGE

CeNTeR wHeel AND PINION

YOKESPRING

seTTING leVeR

ClUTCH wHeel

7S26B 7S36B 7S26C 7S36CPartsName

7

8

10

11

12

14

15

16

18

19

20

24

30

32

36

37

40

44

45

47

49

50

Cal. 7S26C, 7S36CPARTS LIST

2/11

FEATURES

6 DATEDIALGUARDSCREWA(3PICS) 0012354

DIASHOCK

1 HOUR,MINUTE,ANDSECOND HAND

2 DIAl

4 DAYSTARWITHDIALDISK 0160***

5 INTeRMeDIATe wHeel 0989070

19 LOWERBRIDGEFORTHIRD WHEELANDPINION 0436183[BCAL.:0436300]

17 DIALHOLDINGSPACER 4408***

18 LOWERBRIDGEFORTHIRD WHEELANDPINIONSCREW 0012485[BCAL.:0012420]

16 CANNONPINION 0225414[BCAL.:0225005]

15 MINUTEWHEELANDPINION 0261183[BCAL.:0261006]

14 DATEDRIVING wHeel 0802183[BCAL.:0802300]

13 INTeRMeDIATe DATe DRIVING wHeel ANDPINION 0817300

3 SNAPFORDAYSTARWITHDIAL DIsK 0963300

7 DATEDIALGUARDSCREWA (1PIC)0012354[BCAL.:0016705]

8 DATe DIAl GUARD 0808310[BCAL.:0808300]

PARTS LIST Cal. 7S26C, 7S36C

3/11

DISASSEMBLINGPROCEDURESFIGS.:1 52 REASSEMBLINGPROCEDURESFIGS.:52 1 LUBRICATING: TYPESOFOIL OILqUANTITY AO-3(MOEBIUSA) LIBERALqUANTITY SEIKOWATCHOILS-6 NORMALqUANTITY SEIKOWATCHOILS-4 SMALLqUANTITY

9 DATe DIAl 0878***

12 HOUR wHeel 0273183[BCAL.:0271483] 11 DAY-DATECORRECTORSETTING

TRANSMISSIONWHEEL 0737183[BCAL.:0737300]

10DATEJUMPER 0810183[BCAL.:0810030]

FORPARTS9 AND 17,REFERTO“PARTSUSEDDIFFERDEPENDINGONTHECASINGMODEL”ONPAGE8.

21 SECONDREDUCTION WHEELANDPINION 0012539

22 SECONDREDUCTION WHEELANDPINION 0514002

whole tooth

29 RATCHeT wHeel sCRew 0012919

30 RATCHeT wHeel 0285051[BCAL.:0285013]

26 PALLETCOCKSCREW 0012354

27 PALLETCOCK 0161300

20 OSCILLATINGWEIGHT 0509***

28 PALLETFORK 0301009

25-2 SHOCKABSORBING SPRING 0014577

25-3 SHOCKABSORBING jewel 0011220

25-4 HOLEJEWELFOR SHOCKABSORBER 0014295

23 BALLANCECOCKSCREW 0012420

25-1 BALANCECOMPLETE (wITH sTUD) 0310197

For parts 20 and 20 ,referto“REMARKSONDISASSEMBLINGANDREASSEMBLING”onpage9.For parts 23 , 24, and 25 ,referto“ HOWTOREMOVEANDINSTALLTHEBALANCESTAFF”onpage10.

Cal. 7S26C, 7S36CPARTS LIST

4/11

24 BALANCECOCK 0171355 [BCAL.:0171197]

36 FIRSTREDUCTIONWHEEL 0511010[BCAL.:0511006]

33 REDUCTIONWHEEL HOLDER 0836002

31 BARRELANDTRAIN WHEELBRIDGESCREW 0012420

34 HOLDSPRING 0015703

35 CAPJEWEL 0011221

32 BARRELANDTRAIN WHEELBRIDGE 0114178[BCAL.:0112400]

38 ClICK 0381004

BARRELANDTRAINWHEELBRIDGE (back side)

40 BARRELCOMPLETE 0201083[BCAL.:0201075]

41 THIRDWHEELAND PINION 0231070(7S26C) 0231007(7S36C)

39 FOURTHWHEELAND PINION 0241010

37 PAWLLEVER 0831183 [BCAL.:0831004]

For parts 32 , 33 , and 36,referto“ HOWTOREMOVEANDINSTALLTHEBALANCESTAFF”onpage9.

PARTS LIST Cal. 7S26C, 7S36C

5/11

43 CENTERWHEELBRIDGE sCRew 0012354

44 CENTERWHEELBRIDGE 0122302[BCAL.:0122300]

45 CENTERWHEELAND PINION 0224183 [BCAL.:0224075]

46 YOKESPRINGSCREW 0012168

49 SETTINGLEVER 0383178[BCAL.:0383070]

50 ClUTCH wHeel 0282183[BCAL.:0282070]

52 seTTING sTeM 0351***

53 MAINPLATE

51 INTeRMeDIATe wHeel FORCALENDARCORRECTOR 0962008

48 YOKE 0384070

47 YOKESPRING 0388177[BCAL.:0388070]

42 ESCAPEWHEELANDPINION 0251300(7S26C) 0251013(7S36C)

For r parts 52,referto“PARTSUSEDDIFFERDEPENDINGONTHECASINGMODEL”onpage8.

Cal. 7S26C, 7S36CPARTS LIST

6/11

PARTS LIST Cal. 7S26C, 7S36C

7/11

PARTSNAME PARTSCODE PARTSNAME PARTSCODE

UPPERHOLEJEWELFRAMEFORDIASHOCK

0014295

UPPERHOLEJEWELFRAMEFORTHIRDWHEELANDPINION

0015701

LOWERHOLEJEWELFRAMEFORDIASHOCK

UPPERHOLEJEWELFRAMEFORESCAPEWHEELANDPINION

0015711

DIASHOCKUPPERFRAME 0014573UPPERSPRINGFORTHIRDWHEELANDPINION

0015703DIASHOCKLOWERFRAME 0014574

UPPERSPRINGFORESCAPEWHEELANDPINION

DIASHOCKUPPERSPRING0014577

REGULATOR 0341020

DIASHOCKLOWERSPRING STUDSUPPORT 0345197

SCREw PARTS

Partscode Partsname Partscode Partsname

Ratchet wheel screw

0012919

0012539

0012354

0012420

0012 168

second reduction wheel and pinion screw

Center wheel bridge screwPalletcockscrewDate dial guard screw A

BalancecockscrewBarrelandtrainwheelbridge screwlower bridge for third wheel and pinion screw

Yoke spring screw

Representative DATE DIAL example

Color of background

Color of figure CaliberA,B Caliber C

white Black 0878280 0878206

Black white 0878281 0878207

Note:TheDATEDIALusedforcaliberA&BisnotcompatiblewithcaliberC. BesuretoinstallthecorrespondingDATEDIAL.

TECHNICAL GUIDE Cal. 7S26C, 7S36C

8/11

PARTSUSEDDIFFERDEPENDINGONTHECASINGMODEL

9 DATe DIAl 0878*** *Thedatedialuseddiffersdependingonthecasingmodel.PleaserefertotheSEIKOWATCH PARTSCATALOGUEinordertochoosecorrespondingparts.

17DIALHOLDINGSPACER 4408*** Thedialholdingspacerforadiver’swatchhasanidentifyingmark.

IDeNTIFYING MARK

4408170 4408171

* Thedialholdingspaceruseddiffersdependingonthecasingmodel. Referto"SEIKOWatchPartsCatalogue(SEIKOWATCHSERVICESITE)."

52 seTTING sTeM 0351 *** *Thesettingstemuseddiffersdependingonthecasingmodel.Referto"SEIKOWatchParts Catalogue(SEIKOWATCHSERVICESITE)."

TECHNICAL GUIDE Cal. 7S26C, 7S36C

9/11

I. REMARKS ON DISASSEMBLING AND REASSEMBLING

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

20OSCILLATINGWEIGHT(withballbearing)

The inside screw can be found in the inside ring of the ball

bearing.Usethebigscrewdrivertoscrewsufficientlytight.

when setting the oscillating 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

theinsideringoftheballbearing(refertotherightfigure).

FIRSTREDUCTION

wHeel

BALANCECOCK

22SECONDREDUCTIONWHEELANDPINION

32BARRELANDTRAINWHEELBRIDGE

Beforesettingthebarrelandtrainwheelbridge,setthefirstreductionwheelandarbor,pawllever,andreductionwheelholder.

33 REDUCTIONWHEELHOLDER

How to disassemble How to assemble

36 FIRSTREDUCTIONWHEEL

liberally lubricate the first reduction wheel (refertotherightfigure).

lubricate the second reduction wheel and pinion (refertotherightfigure).

TECHNICAL GUIDE Cal. 7S26C, 7S36C

10/11

:HOWTOREMOVEANDINSTALLTHEBALANCESTAFF

HOWTOREMOVE HOWTOINSTALL1. Initialphase set the balance complete with stud and balance cock to

themainplate.

2. Movethestudsupporttowardthebalancecockuntilitisattachedtothebalancecock.* when doing so, make sure that the outer end of the

hairspringisnotremovedfromtheregulatorarm.

3. Usingsturdytweezers,pushthestudoutwardfromthedirection of the arrow shown in the illustration until it is removedfromthestudsupport.

4. Remove the balance cock and replace the balancecompletewithstudwithanewone.

3. Temporarilysetthestudtothestudsupport. Make sure that the hairspring passes outside the pin of

theregulatorarm.*Becarefulsoasnottodamagethehairspring.

1. Initialphase Setanewbalancecompletewithstudtothemainplate.

2. Setthebalancecockandtightenthebalancecockscrew.

4. Usingsturdytweezers,setthestudtothestudsupportandpressitdown.

Make sure that the outer end of the hairspring passes throughtheregulatorslotoftheregulatorarm.*Becarefulsoasnottodamagethehairspring.

TECHNICAL GUIDE Cal. 7S26C, 7S36C

11/11

HOWTOADJUSTTHEHAIRSPRING

1. Namesoftheparts

A:Stud

B:Regulatorpin

C:Regulatorarm

D:Studsupport

2. Rotate B to f ine-tune theposition of the outer end of the hairspring which passes through the regulator slot so that the hairspring makes the longestdiameter.

3. Rotate A to f ine-tune theposition of the outer end of the hairspring so that the hairspring passes through the center of the regulator slot.

4. Rotate B to f ine-tune thee f f e c t i v e l e n g t h o f t h e hairspr ing which passes through the regulator slot to defineadequateclearance.

Maximumclearance

Minimum clearance

2 3 4

ADJUSTTHEPOSITIONOFTHEHAIRSPRINGSOTHATITPASSESTHROUGHTHECEN-TEROFTHEREGULATORSLOT.

sTUDSTUDSUPPORT

REGULATORARM

REGULATORPIN

TOADJUSTTHELENGTHOFTHEHAIRSPRING,RO-TATETHEREGULATORPINONLYCOUNTERCLOCK-wIse (As INDICATeD wITH THEARROW).WHILEDO-INGSO,MAKESURETHATTHEHAIRSPRINGDOESNOTLEANTOONESIDE.

MOVETHESTUDSUPPORTTOCORRECTLYPOSITIONTHEROLLERJEWEL. ADJUSTTHELOCATIONOF

THEREGULATORARMTOFINE-TUNETHELENGTHOFTHEHAIRSPRING.

ROTATETHEREGULATORPINTOAD-JUSTTHECLEARANCETOCONTROLTHESWINGANGLEOFTHEHAIR-SPRING.

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