PARTS CATALOGUE / TECHNICAL GUIDE - Seikoholisti

PARTS CATALOGUE /TECHNICAL GUIDECal. 7S25B, 7S35B, 7S55B[SPECIFICATIONS]BrandSEIKOCal. No.Item7S25B7S35B7S55BMovement(x 1.5)MovementsizeOutside diameterØ 27.4 mmCasing diameterØ 27.0 mm4.9 mmHeightTime indicationVibration per hourAdditional mechanisml 3 hands (hour, minute and second hands)21,600 Hz/hour (6 beats per second)l Automatic windingl Date calendarl Date correction function7S25B :21 jewels7S35B, 7S55B :23 jewelsJewels7S25A/ 7S35A/ 7S55A7S25B/ 7S35B/ 7S55B These sections aredifferent from A Cal.The difference between ACal.and B Cal.* Cal.7S watches are changedfrom caliber “A” to caliber “B”in October 2006 production. According to the change, wewould like you to pay attentionto the design of the balances t a f f w h e n r e p a ir in g t h o s ewatches. Refer to “PARTS CATALOGUE/TECHNICAL GUIDECal. 7S25A,7S35A,7S55A.” /8 Refer to “PARTS CATALOGUE/TECHNICAL GUIDECal. 7S25B,7S35B,7S55B.”

Cal. 7S25B, 7S35B, 7S55BPARTS CATALOGUEDisassembling procedures Figs.: 1Reassembling procedures Figs.: rjLubricating: Types of oilAO-3 (Moebius A)SEIKO Watch Oil S-6SEIKO Watch Oil S-4rj1Oil quantityLiberal quantityNormal quantitySmall quantity1 Hour, minute, and second hand2 Dial3 Date dial guard screw A (3 pics)0012 3544 Date dial guard screw B (1 pic)0016 7055 Date dial maintaining plate0808 0306 Date dial0878 ***7 Date jumper0810 0308 Day-date corrector settingtransmission wheel0737 3009 Hour wheel0271 483q; Intermediate datedriving wheel and pinion0817 300qa Date driving wheel0802 300qs Minute wheel and pinion0261 006qd Cannon pinionqf Dial holding spacer4408 ***qg Lower bridge for third wheel and0012 420pinion screwqh Lower bridge for thirdwheel and pinion0436 300Diashock*Parts qgand qh are only used in the7S35 and 7S55 watches.For parts 6 and qf , refer to “ PARTS USED DIFFER DEPENDING ON THE CASING MODEL” on page 5.2/8

Cal. 7S25B, 7S35B, 7S55BPARTS CATALOGUEqj Oscillating weight (withball bearing)0509 188(7S25B)0509 196(7S35B)0509 198(7S55B)qk Second reduction wheel andpinion screw 0012 539ql Second reduction wheel and pinion0514 002wh Ratchet wheel screw0012 919wj Ratchet wheel0285 013Diafixea First reduction wheel0511 006es Pawl lever0831 004wk Barrel and train wheel bridgescrew0012 420e; Reduction wheel holder0836 002wl Barrel and train wheel bridge0112 300ed Click0381 004ef Fourth wheel & pinion0241 010eg Barrel complete (with mainspring)0201 024eh Third wheel & pinion0231 070 (7S25B)0231 007 (7S35B, 7S55B)ej Escape wheel & pinion0251 300 (7S25B)0251 013 (7S35B, 7S55B)ek Center wheel bridge screw0012 354el Center wheel bridge0122 300Diashockw; Balance cock screw0012 420r; Center wheel & pinion (withcannon pinion) 0224 078ra Yoke spring screw0012 168rs Yoke spring0388 070rd Yoke0384 070wa Balance cock0171 197ws Balance completewithout stud0310 197rf Setting lever0383 070rg Clutch wheel0282 070rh Intermediate wheel for calendarcorrector0962 008rj Winding stem0351 ***wd Pallet cock screw0012 354wf Pallet cock0161 300wg Pallet fork0301 009For parts qj , ql , wl , e;, and ea , refer to “REMARKS ON DISASSEMBLING AND REASSEMBLING” on page 6.For parts w; , wa, and ws refer to “HOW TO REMOVE AND INSTALL THE BALANCE STAFF” on page 7.For parts rj , refer to “ PARTS USED DIFFER DEPENDING ON THE CASING MODEL” on page 5.3/8

Cal. 7S25B, 7S35B, 7S55BPARTS CATALOGUEscrew partsParts codeParts nameParts codeCenter wheel bridge screwPallet cock screwDate dial guard screw AParts nameRatchet wheel screw0012 3540012 919Balance cock screwBarrel and train wheelbridge screwLower bridge for thirdwheel and pinion screwSecond reduction wheel andpinion screw0012 4200012 539Date dial guard screw BYoke spring screw0012 168Parts name0016 705Parts codeUpper hole jewel frame for diashock0014 295Lower hole jewel frame for diashockParts nameUpper hole jewel frame for thirdwheel and pinion0015 701Upper hole jewel frame for escapewheel and pinion0015 711Diashock upper frame0014 573Upper spring for third wheel and pinionDiashock lower frame0014 574Upper spring for escape wheel andpinionDiashock upper springParts code0015 703Regulator0341 020Stud support0345 1970014 577Diashock lower spring4/8

Cal. 7S25B, 7S35B, 7S55BTECHNICAL GUIDEPARTS USED DIFFER DEPENDING ON THE CASING MODEL6 Date dial0878 ****The date dial used differs depending on the casing model.qf Dial holding spacer4408 ***The dial holding spacer for a diver’s watch has an identifying mark.Identifying mark4408 1704408 171The dial holding spacer used differs depending on the casing model. Refer to "SEIKO WatchParts Catalogue (SEIKO WATCH SERVICE SITE)."*rj Winding stem0351 **** The winding stem used differs depending on the casing model. Refer to "SEIKO Watch PartsCatalogue (SEIKO WATCH SERVICE SITE)."5/8

Cal. 7S25B, 7S35B, 7S55BTECHNICAL GUIDElThe following description is only applicable to 7S caliber watches.I. REMARKS ON DISASSEMBLING AND REASSEMBLINGqj Oscillating weight (with ball bearing)The inside screw can be found in the inside ringof the ball bearing. Use the big screwdriver toscrew sufficiently tight. When setting the oscillating weight, align the hole of the first reductionwheel with the hole of the balance cock, and thenset the oscillating weight by tightening the insidescrew of the inside ring of the ball bearing (referto the right figure).First reductionwheelBalance cockql Second reduction wheel and pinionLubricate the second reduction wheel and pinion(refer to the right figure).wl Barrel and train wheel bridgeBefore setting the barrel and train wheel bridge, set the first reduction wheel and arbor,pawl lever, and reduction wheel holder.e; Reduction wheel holderHow to assembleHow to disassembleea First reduction wheelLiberally lubricate the first reduction wheel(refer to the right figure).6/8

Cal. 7S25B, 7S35B, 7S55BTECHNICAL GUIDEw; - ws :How to remove and install the balance staffHow to installHow to remove1.Initial phaseSet the balance complete with stud and balance cock tothe main plate.2.Move the stud support toward the balance cock until it isattached to the balance cock.* When doing so, make sure that the outer end of thehairspring is not removed from the regulator arm.3.1.Initial phaseSet a new balance complete with stud to the main plate.2.Set the balance cock and tighten the balance cock screw.3.Temporarily set the stud to the stud support.Make sure that the hairspring passes outside the pin ofthe regulator arm.* Be careful so as not to damage the hairspring.Using sturdy tweezers, push the stud outward from thedirection of the arrow shown in the illustration until it isremoved from the stud support.4.4.Re move the balan c e c o c k and r epla c e the balan c ecomplete with stud with a new one.7/8Using sturdy tweezers, set the stud to the stud supportand press it down.Make sure that the outer end of the hairspring passesthrough the regulator slot of the regulator arm.* Be careful so as not to damage the hairspring.

Cal. 7S25B, 7S35B, 7S55BTECHNICAL GUIDEHOW TO ADJUST THE HAIRSPRING1. Names of the partsA: StudB: Regulator armC: Regulator pinD: Stud support2. Ro t a te B to f in e - tun e theposition of the outer end ofthe hairspring which passesthrough the regulator slot sothat the hairspring makes thelongest diameter.23. Rot a te A to f ine - tune theposition of the outer end ofthe hairspring so that thehairspring passes throughthe center of the regulatorslot.3Maximumclearance4Minimumclearance4. Ro t a te B to f in e - tun e theef fective length of thehairspring which passesthrough the regulator slot todefine adequate clearance.Adjust the position of the hairspring so that it passes throughthe center of the regulator slot.StudStud supportRegulator armRegulator pinTo adjust the length of thehairspring, rotate the regulator pin only counterclockwise (as indicated with thearrow). While doing so,make sure that the hairspring does not lean to oneside.Move the stud support to correctly position the roller jewel.Rotate the Regulator pin to adjust theclearance to control the swing angleof the hairspring.Adjust the location of the regulator arm to fine-tune the length ofthe hairspring.Copyright 2007 by8/8

The dial holding spacer for a diver’s watch has an identifying mark. Identifying mark 4408 170 171 * The dial holding spacer used differs depending on the casing model. Refer to "SEIKO Watch Parts Catalogue (SEIKO WATCH SERVICE SITE)." rj Winding stem 035 *** * The winding stem used differs depending on the