Omega CALIBRE 2628 Quick start guide

2628

2628 A

111/2’’’

Ø 25,60 mm

Version A Version B

123

Height on movement 5.20 mm

Power reserve

Number of jewels

Frequency

Lift angle

44 h

4 Hz (28’800 A/h)

30° / 38°

48 h

3.5 Hz (25’200 A/h)

38°

CALIBRE

2628

Automatic movement, Co-Axial escapement, date, Time zone function, GMT, COSC-certified,

Omega balance system without index. GMT, hour, minute and second hands in centre.

Technical Guide TG-19-C-006-E D

Produced by : pelrom Date: 09.10.2008 3

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D - 2628 /1

Page

Calibre 2628 1

General information for Calibre 2628 3-4

Date correction / Improvements on version B / Complete balance bridge 3

Torques according to the screw threads / Measuring instruments 3

Technical modiﬁcations on version «A» and «B» / Hand ﬁtting / Tools / Lubricants 4

Exploded views for Calibre 2628 7-11

Dial side 7

Spare parts list for Calibre 2628 11-14

Spare parts list 11

Speciﬁc information for Calibre 2628 15-19

Assembling of escapement system / Lubrication of the escapement 15

Contents

Movement side 8

Movement side 9

Dial side 10

Assembling of the balance bridge / Disassembling of the balance bridge 16

Runners for hands setting and hand setting force / Height of hands 17

Components not requiring epilam coating 18

Special parameter settings / Timing key 19

Spare parts list 12

Spare parts list 13

Spare parts list 14

Differences between calibre 2628A and 2628B 5-6

Differences between calibres 5-6

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D - 2628 /2

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D - 2628 /3

Date correction

The date Correction is not recommended between 10 p.m.

and 2 a.m.

Improvements on version B

Complete balance bridge (Ref. 10.058°)

Chronometer balance bridges are not available

(see CS-Info. Calibre No. 33).

Tightening and untightening torques according to screw

thread size

Screw Ø Tightening torque target cNm Untightening torque mini cNm

Øthreads ≤S 0.50 mm 1.0 0.7

Øthreads S 0.6 mm 1.4 0.8

Øthreads S 0.7 mm 1.8 0.9

Øthreads S 0.8 mm 2.2 1.1

Øthreads S 0.9 mm 2.6 1.3

Øthreads S 1.0 mm 3.0 1.6

Øthreads S 1.2 mm 3.5 2.0

Øthreads S 1.4 and > 4.0 2.5

Type of intervention and the required

«Measure Instrument»

General information for Calibre 2628

Version A Version B

Quality of adjustment:

Good

Quality of adjustment:

Improved

Self-starting: Medium Self-starting: Good

Interventions Minimum equipment required Comments

Complete or Partial maintenance

service Co-Axial 3.5 Hz & 4 Hz

- Watch Expert II (White case)

- Chronoscope M1 (up-dated version)

- Chronoscope S1

Rate adjustment on new watches:

(Co-Axial 3.5 Hz & 4 Hz)

- Watch Expert (red case)

- Wicometer Professionnel

- Chronoscope M1 (old version)

Important: The amplitude will

not be indicated precisely.

This is acceptable for the

rate adjustment only!

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D - 2628 /4

General information for Calibre 2628

Technical modiﬁcations on version «A» and «B»

Hand ﬁtting

To ﬁt the hands, the movement must be placed in a suitable,

well-adjusted movement holder.

Tools Ref.

Hand fitting tool kit 507 0011

Movement holder for hand fitting 507 0017

Mainspring winder 502 150 0009

Timing key 506 0042

Tool for checking the escapement

functions 506 0002

Ball bearing set 502 S03 SET

Key-bolt key for oscillating weight 502 200 0361

Holder for oscillating weight 502 100 0381

Lubricants Ref.

Moebius SYNT-A-LUBE 9010 (2ml) 504 200 0001

Moebius HP-500 504 5012

Moebius SYNT HP-1300 Sans Colorant 504 5013

Moebius 9504 504 5014

Kluber P125 504 100 0071

Lubeta V105 504 5005

Intermediate escape wheel

Old version Risk New version Improvements Notes

7222500C30039

Black residues within

the engagement can

cause low amplitude or

a stop of the watch.

The old version is yellow.

7222500C30039

Improvement of surface

and material.

The new version is grey.

Available since 21/2008

The new version must

automatically be assembled

if black residues within the

engagement are visible.

2628A (4 Hz) 2628B (3.5 Hz)

Mainplate

ref. 72226281002007

Engraving 2628A

ref. 7222628B81002007

Engraving 2628B

Balance bridge

ref. 7222500B10058°

ref. 7222500C10058°

Barrel, complete

ref. 7222500B20010 ref. 722112020010

Mainspring

ref. 7222500B20102 ref. 722112020102

Oscillating weight

2628

ref. 72226282201006

2628B

ref. 7222628B2201006

Second wheel

ref. 722112830027*

96 teeth and eight arms

ref. 7222628B30027*

105 teeth and ﬁve arms

Intermediate escape wheel

ref. 7222500B30039

8-leaf pinion

ref. 7222500C30039

10-leaf pinion

Cutout in upper pivot shank

Co-Axial wheel

ref. 7222500B30040

Pinion Ø = 1.999 mm

ref. 7222500C30040

Pinion Ø = 2.119 mm

Pallet fork

Old shape

ref. 7222500B40010

New shape

ref. 7222500C40010

Differences between versions 2628A and 2628B

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D -2628 /5

Differences between versions 2628A and 2628B

2628A (4 Hz) 2628B (3.5 Hz)

Balance complete with stud

Inertia

Diameter

Balance rim thickness

Pivots

Shock absorber

Rate correction with 1 screw-revolution (on both screws)

ref. 7222500B4005021

7.2 (mgcm2)

8.54 mm

0.37 mm

0.08 mm cylindrical

0.09 mm = pivot hole Ø

57 seconds

ref. 7222500C4005021

9.4 (mgcm2)

8.70 mm

0.45 mm

0.07 mm conical

0.08 mm = pivot hole Ø

86 seconds

Stop lever

ref. 722250056070 ref. 7222500C56070

Shock-absorber, upper

ref. 722112070530 ref. 7222500C70530

Shock-absorber, lower

ref. 722112070531 ref. 7222500C70531

In settings, upper

ref. 722112070640 ref. 7222500C70640

In settings, lower

ref. 722112070641 ref. 7222500C70641

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D -2628 /6

Parts listed in order of assembly

1 = 31120

2 = 31121

3 = 5101021

4 = 53022

5 = 5108006

6 = 51050

7 = 51091

8 = 3503 (1x)

9 = 31100

Moebius SYNT HP-1300 Sans Colorant

Moebius 9504

Exploded views - Dial side for Calibre 2628

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D -2628 /7

920

Versions A&B

see page 5

Restrictions:

see page 3

Versions A&B

see page 6

See page 15

Versions A&B

see page 5

Versions A&B

see page 5

Versions A&B

see page 5

Parts listed in order of assembly

1 = 1004107

2 = 32033

3 = 31023

4 = 31024

5 = 31021

6 = 51120

7 = 81036

8 = 3509 (1x)

9 = 30012

10 = 20010

11 = 31020

12 = 1004107

13 = 3503 (3x)

14 = 30039

15 = 30025

16 = 30027*

17 = 1004807

18 = 3505 (1x)

19 = 30040

20 = 40010

21 = 1005707

22 = 3511 (1x)

23 = 3511 (1x)

24 = 10058°

4005021

Moebius SYNT-A-LUBE 9010

Moebius SYNT HP-1300 Sans Colorant

Moebius SYNT HP-500

Moebius SYNT HP-1300 Sans Colorant

Kluber P125

Exploded views - Movement side for Calibre 2628

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D -2628 /8

Parts listed in order of assembly

1 = 56070

2 = 1203007

3 = 32032

4 = 32031

5 = 32037

6 = 52040

7 = 1205107

8 = 3504 (1x)

9 = 2201006

10 = 3507 (3x)

11 = 3503 (3x)

12 = 52041

13 = 12124

14 = 3506 (1x)

2628

Versions A&B

see page 6

See CS-Info Calibre no. 26 Lubeta V105

When Lubeta V105 is available, do not

use Moebius 9010

Moebius SYNT-A-LUBE 9010

Moebius SYNT HP-1300 Sans Colorant

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D - 2628

Exploded views - Movement side for Calibre 2628

Parts listed in order of assembly

1 = 31083*

2 = 31041

3 = 31100

4 = 31101

5 = 10062

6 = 3503 (1x)

7 = 31101

8 = 33032

9 = 31046*

10 = 33014

11 = 1601006

12 = 3502 (3x)

13 = 91440

14 = 53080

15 = 13111

16 = 3501 (1x)

17 = 13105 (2x)

18 = 3500 (2x)

19 = 3104706*

Moebius 9010

Moebius SYNT HP-1300 Sans Colorant

Moebius 9504

OMEGA SA WORLD SERVICE ORGANIZATION GT-19-C-006-E - D - 2628

Exploded views - Dial side for Calibre 2628

/10

Additional lubrication:

See CS-Info Calibre no. 32

Lubrication spot (Moebius 9010, small quantity)

at the exit of the second wheel axe - centre tube.

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