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Seiko 8R48A, Техническое руководство, Страница: 19 / 24

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Detach and reassemble the chronograph unit and base unit by taking off the screws (4pcs.)

8. Chronograph unit and Base unit (Disassembling and Reassembling)

Note:

Before attaching the chronograph unit, check that base unit operates correctly.
When attaching chronograph unit on base unit, push button A for the START function, in order to ensure that 
the following wheels mesh perfectly with one another.

9. Identification and setting position of Dial washers

TECHNICAL GUIDE

Cal. 8R48A/8R49A

19/24

 55  Main plate screw

 58  Main plate screw

Chronograph unit

Base unit

Crown position

Base unit

Chronograph unit

Check point

First click position

Date corrector setting
transmission wheel D

Date corrector setting 
transmission wheel E

Date correction

Second click position

Minutes transission 
wheel

Minute wheel pinion A

Hand setting

Seconds transmission 
wheel

Seconds counter 
intermediate wheel

Hand driving

 55

 51

 56

Parts code

Parts code

Set position

Note

Dial washer B 

(2 pcs)

0491 181

Minute counting 

wheel

Hour counting wheel

• Color of Brass

Do not set it upside down

Dial washer C

0491 182

Minute counter 

intermediate wheel 

and pinion B

• Color of Silver

Dial washer D

0491 183

Second wheel

• Color of Brass

 20

19

 21

Содержание 8R48A

Страница 1: ...Height 7 62 mm 3 hands hour and minute hands and small second hand at 3 o clock position Calendar Date Date disk 28 800 8 beats per second Testing positions 10 s d Measurement daily rate in seconds s...

Страница 2: ...OTE Please press button A to START the chronograph function before disassembly If it is at RESET position 41 Chronograph coupling lever A and 42 Chronograph coupling lever B are under 47 Second counti...

Страница 3: ...190 Chronograph bridge Refer to page 15 for the oiling position Refer to page 10 for the parts code 17 0012 092 Chronograph bridge screw 16 0353 177 Second counting sheel spring 15 0012 092 Second cou...

Страница 4: ...pinion A 25 0902 Hour counting wheel Refer to page 11 for location of jewels 27 0894 177 Wheel stop lever 28 0587 179 Hammer operating lever B 26 0743 179 Hour chronograph coupling lever Refer to page...

Страница 5: ...Chronograph coupling lever B 32 0571 177 Operating lever A 33 0012 092 Operating lever spring screw 45 0012 201 Operating cam screw 46 0576 180 Operating cam Refer to page 14 for the oiling position...

Страница 6: ...ission wheel C 53 0962 190 Date corrector setting transmission wheel B 54 0817 180 Time setting transmission wheel and pinion 55 0505 181 Second transmission wheel Refer to page 17 for the setting pos...

Страница 7: ...nce complete with stud Refer to page 10 for the parts code 61 0012 354 Pallet bridge screw 62 0161 310 Pallet bridge 63 0301 315 Pallet fork PARTS CATALOGUE Cal 8R48A 8R49A 7 24 1 1 Types of oil AO 3...

Страница 8: ...and arbor 73 0831 183 Pawl lever 72 0836 002 Reduction wheel holder 69 0012 420 Barrel and train wheel bridge screw 71 0363 184 Ratchet sliding wheel spring 76 0436 166 Lower plate for barrel and trai...

Страница 9: ...crew 80 0122 302 Center wheel bridge 81 0221 178 Center wheel and pinion 82 0381 004 Click 83 0201 178 Barrel complete with mainspring 85 0012 168 Yoke spring screw 86 0388 177 Yoke spring 84 0251 314...

Страница 10: ...Color of numbers Color of background 0878 109 3H 3H Black Silver Plain metal 0878 108 3H 3H White Black How to find the correct parts if not determined by 4 digit caliber number All parts code are su...

Страница 11: ...MINUTE COUNTING 1ST INTERMEDIATE WHEEL 25 HOUR COUNTING WHEEL 24 MINUTE COUNTING WHEEL 43 SECONDS COUNTING WHEEL 44 SECONDS WHEEL 47 CHRONOGRAPH WHEEL 60 BALANCE COMPLETE WITH STUD 63 PALLET FORK ENTR...

Страница 12: ...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 Cal 8R48A 8R49A PARTS CATALOGUE 12 24 Tools and consumables required for disassembli...

Страница 13: ...Lower plate for barrel and train wheel bridge 75 Lower plate for barrel and train wheel bridge screw And then set first reduction wheel pawl lever reduction wheel holder 1 1 4 3 2 74 First reduction...

Страница 14: ...upling lever Back side 5 29 Click spring 6 56 Minutes transmission wheel TECHNICAL GUIDE Cal 8R48A 8R49A 14 24 30 Hammer operating lever A 37 Operating cam jumper 29 Click spring 31 Hammer 1 2 2 1 Not...

Страница 15: ...aph bridge Dial side Back side Turn the gear after oiling TECHNICAL GUIDE Cal 8R48A 8R49A 15 24 3 1 2 4 Note There must be oil within the range of the arrow 1 2 3 4 Types of oil AO 3 Moebius A Oil qua...

Страница 16: ...ing cam jumper 29 Click spring 31 Hammer 34 Operating lever spring 32 Operating lever A 40 Chronograph coupling lever holder 42 Chronograph coupling lever B 39 Chronograph coupling lever spring 26 Hou...

Страница 17: ...nograph coupling lever A and chronograph coupling lever B as illustrated TECHNICAL GUIDE Cal 8R48A 8R49A 17 24 3 Chronograph coupling A and B setting position 42 Chronograph coupling lever B 4 Hour ch...

Страница 18: ...re hung up on Barrel and train wheel bridge with hole jewel frame Reassembling Disassembling Reassembling 7 Disassembling Reassembling of the ratchet sliding wheel spring PUSH TECHNICAL GUIDE Cal 8R48...

Страница 19: ...screw 58 Main plate screw Chronograph unit Base unit Crown position Base unit Chronograph unit Check point First click position Date corrector setting transmission wheel D Date corrector setting tran...

Страница 20: ...art is as follows Regulator Time adjustment Stud support Beat error adjustment Regulator pin Isochronous fault adjustment Anticlockwise rotation Clockwise rotation TECHNICAL GUIDE Cal 8R48A 8R49A 20 2...

Страница 21: ...normal position 2 Pull out winding stem while pushing A Enlarged View Balance bridge guide pin First reduction wheel gear Setting lever Winding stem 13 To wind up the mainspring The mainspring would b...

Страница 22: ...on a flat metal plate We recommend the use of Universal movement holder to install hands Static weighting Button B Chronograph reset Button A Chronograph start stop Note During time setting if the chr...

Страница 23: ...nd hand Hour hand 1 Pull out the crown to the second click position 2 Turn the crown to set hour and minute hands Check that AM PM is set correctly 3 Push the crown back into the normal position 2 How...

Страница 24: ...ndicate the elapsed time Push button B to reset chronograph All chronograph hands will be reset to 0 position Restart and stop of chronograph can be repeated as many times as necessary by pushing butt...

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