background image

5.  Lubricate  the  shaft  of  the  date  star  as 

illustrated. 

 

Type of oil: S-6

1.  Set the date indicator driving wheel.

2.  Set the date corrector setting wheel. 

3.  Set the date star.

*   Make sure that the date indicator driving wheel 

and date star are correctly engaged as shown in 
the illustration.

Date indicator driving wheel

2 Date corrector setting wheel

Date star 

Date jumper

4.  Set the date jumper.

*   Make sure that the date jumper and date star are 

correctly engaged as shown in the illustration.

Date star 

5.  Lubricate  the  shaft  of  the  date  star  as 

illustrated.

 

Type of oil: S-6

4 Date jumper

3 Date star 

1 Date indicator driving wheel

ReAssemble the movement

16

Align  the  tip  of  gear 
teeth  of  the  date  star 
with  the  notch  on  the 
date  indicator  driving 
wheel to ensure proper 
orientation.  

TECHNICAL GUIDE

Cal. 6R20A

18/24

Summary of Contents for 6R20A

Page 1: ...tomatic winding with auxiliary hand winding mechanism x 1 0 27 4 mm 27 0 mm l Date hand Day hand and Power reserve indicator l Date Day correction function l Second hand stop mechanism l Clearance adj...

Page 2: ...r reserve indicator 5 Date hand 1 Second hand 2 Minute hand 6 Day hand 9 Auxiliary train wheel bridge 0126 025 8 Auxiliary train wheel bridge screw 4 pcs 0012 201 7 Dial Disassembling procedures Figs...

Page 3: ...and planet unit 1001 025 qh Sun wheel 1009 003 qd Planetary reduction wheel 1026 002 qs Barrel arbor pinion 1010 267 wj Minute wheel and pinion 0261 006 wl Cannon pinion wf Day star 0970 003 wd Day d...

Page 4: ...n 0241 216 ta Click 0381 004 ts Escape wheel pinion 0251 310 td Barrel complete 0201 074 tj Yoke spring screw 2pcs 0012 168 tk Yoke spring 0388 071 tl Yoke 0384 061 y Setting lever 0383 060 ya Balance...

Page 5: ...bridge screw 3 pcs Balance bridge screw Casing clamp screw 2 pcs 0012 168 0012 420 0012 067 Cross section view of the screw parts 0012 201 Auxiliary main plate screw Auxiliary train wheel bridge scre...

Page 6: ...the stud to the stud support Make sure that the hairspring passes outside the pin of the regulator arm Be careful not to damage the hairspring 1 Initial phase Set a new balance complete with stud to...

Page 7: ...tary reduction wheel Type of oil S 6 Lubricate at the six points on the surface of the main plate as illustrated 1 Lower hole jewel for the barrel complete 2 Lower hole jewel for the pallet fork 3 Low...

Page 8: ...Cal 6R20A TECHNICAL GUIDE 1 Lubricate the upper hole jewel for the third wheel bridge and set the upper hole jewel with frame Then set the upper shock absorbing spring for the third wheel bridge Type...

Page 9: ...nd arbor 1 Lubricate at the arbor of the first reduction wheel and arbor 7 8 9 TECHNICAL GUIDE 1 Set the first reduction wheel and arbor with the magic lever attached to the barrel and train wheel bri...

Page 10: ...and pinion 11 12 13 3 Lubricate the upper hole jewel for the forth wheel and pinion 1 Lubricate at the four points in the crown wheel 1 Set the lower plate for barrel and train wheel bridge 2 Screw th...

Page 11: ...n 2 Lubricate the center wheel pinion as illustrated 2 Type of oil S 6 Type of oil S 6 3 Set the escape wheel pinion 4 Set the barrel complete 5 Set the click 1 Set the center wheel bridge 2 Tighten t...

Page 12: ...e winding stem in the correct order shown in the illustration 1 Lubricate the contact points between the upper and lower tubes of the setting lever and yoke and then set the setting lever 1 Setting le...

Page 13: ...e spring 4 Try pulling out the winding stem to check that it can be done smoothly 1 Set the third wheel pinion 2 Lubricate the convex part of the fourth wheel pinion as illustrated and then set it 2 F...

Page 14: ...n set the ratchet wheel Notes 1 Ratchet wheel 2 Tighten the ratchet wheel screw Do not tighten the ratchet wheel screw too much 3 Try turning the crown clockwise a little at its original position in o...

Page 15: ...rated 1 Lubricate the teeth surface of the second reduction wheel as illustrated 3 Automatic train bridge 1 Second reduction wheel pinion Type of oil S 6 2 Lubricate the upper pivot of the second redu...

Page 16: ...roperly adjusted 1 Set the minute wheel pinion 2 Lubricate the lateral surface of the hour wheel as illustrated and then set the hour wheel 2 Hour wheel 1 Minute wheel pinion Type of oil S 6 3 Lubrica...

Page 17: ...ged as shown in the illustration Day driving wheel Day star Day jumper 4 Set the day jumper Make sure that the day jumper and the day star are correctly engaged as shown in the illustration Day star 1...

Page 18: ...ng wheel 2 Date corrector setting wheel Date star Date jumper 4 Set the date jumper Make sure that the date jumper and date star are correctly engaged as shown in the illustration Date star 5 Lubricat...

Page 19: ...bricate the planetary reduction wheel as illustrated 1 Planetary reduction wheel 2 Barrel arbor pinion 4 Intermediate power reserve wheel 5 Power reserve wheel Type of oil S 6 2 Set the barrel arbor p...

Page 20: ...y train wheel bridge screws 4 pcs Type of oil AO 3 Moebius A 2 Lubricate the day jumper as illustrated Type of oil AO 3 Moebius A 3 Set the auxiliary train wheel bridge 4 Tighten the auxiliary train w...

Page 21: ...es not lean to one side TECHNICAL GUIDE Cal 6R20A 21 24 1 Names of the parts A Stud B Regulator pin C Regulator arm D Stud support 2 Rotate B to fine tune the position of the outer end of the hairspri...

Page 22: ...1 Set the oscillating weight and tighten the screw Make sure that the oscillating weight is correctly positioned REASSEMBLE THE MOVEMENT 21 TECHNICAL GUIDE Cal 6R20A 22 24...

Page 23: ...nd moves after the date hand is correctly aligned If not the day hand and the date hand do not move in the proper order If they are not correctly aligned remove the auxiliary train wheel bridge and re...

Page 24: ...hour hand at the 12 o clock position 3 Mount the minute hand at the 12 o clock position 4 Turn the hour and minute hands to check the time when the date is changed 5 Mount the second hand at the 12 o...

Reviews: