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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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