LEMANIA CH 27C12 User manual

IDENTIFICATION OF CHRONOGRAPH
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LEMANIA CAL. CH 27C12
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INSTRUCTIONS
For use of book
DISASSEMBLY OF THE CHRONOGRAPHMECHANISM:
1. Study the isometric drawing at top of page I-A. The isometric drawing was
made for the following purposes:
A. It helps to identify the part to be removed.
B. This drawing aids in pointing out certain locations on the part
that are mentioned in the oiling procedure.
C. The text refers to certain points on the part. These points are
shown in the isometric drawing. This should aid you in finding
the exact location on the part that is described in the text.
D. It helps you to know the shape of the part in case a new part has
to be made.
2. At the bottom of the page I-A is a photograph of a chronograph. In this photo-
graph is the same part painted in black. The part is in its exact location that this
part occupies in the watch. Find this location in the watch.
3. Read the disassembly procedure and the hazards in disassembly on page 1 in
this book.
4. Remove this part in the same procedure as described in the text.
5. A very imp-ortant item in disassembling a chronograph is keeping the screws in
order, much time will be lost in putting the chronograph together if screws are
mixed up. This means you have to hunt for each screw, sometimes trying three or
four screws before finding the correct one. It cannot be stressed too strongly that
care should be taken so that screws are not mixed up. The system that we advise
for beginners, is to replace each individual screw after each part is removed. This
naturally eliminates the hazard of mixing up the screws and will save you much time
in the end. Do this at least until you become so thoroughly familiar with the
chronograph that you no longer feel it is necessary.
6. Continue to follow this procedure throughout the book and disassemble each part
until the last part of the chronograph is removed.
ASSEMBLYOF THE CHRONOGRAPHMECHANISM:
7. Whenyou are ready to assemble the chronograph mechanism, study the isometric
drawing on the last part in this book. This drawing should aid you in identifying the
part to be assembled.
3. At the bottom of this page is a photograph of a.chronograph. In this photograph
is the same part painted in black. The part is in its exact location that this part
occupies in the watch.
9. Read the assembly procedure and the hazards in assembling for the last part
in this book. (Continued on next page)

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INSTRUCTIONS
(Continued)
10. Replace the part in its exact location as shown in photograph, using the procedure
as described in the text.
11. After you find the correct location for this part in the watch, read the oiling
procedure for this part. The oiling procedure for this part is located underneath
the isometric drawing. It is best to read the oiling procedure before you put each
part in place as there are certain parts that must be oiled immediately as it may
prove difficult to oil them later.
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12. Replace the screw that holds this part in place. Of course, the screws should
be kept in order as we advised above, but if the screws are not in order or the watch
was received with screws mixed up, you will find a screw drawn for each part that
requires a screw at the bottom of the text page.
13. After replacing this part, replace the next part, etc., until the last part is
replaced, which will be part No.1. Each part should be replaced using the same
procedure as described in the text.
(Naturally, the assembly of the chronograph is exactly the reverse of the disassembly)
14. After disassembling and assembling the chronograph mechanism, start on page
1 and read the function of this part. After reading the function of this part, continue
to read the function of each part throughout the book. Study each part, one at a
time. This text should help you to understand more fully the purpose of each part
in the chronograph mechanism.
15. Now put movement in its case with dial on, then replace hands.
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16. Study the text on functional results in this book, and check the chronograph
mechanism as described in this text.
NOMENCLATURE OF PARTS FOR CHRONOGRAPH MECHANISM
17. After you have become familiar with the Chronograph mechanism, you can
disassemble and assemble the chronograph by using the nomenclature of parts as a
.guide. This makes it possible for you to use a procedure without going through each
page in the book.
18. ADJUSTMENTOF ECCENTRICSTUDS:
Read the text on adjustment of eccentric studs, this text should be read in reference
to the eccentric stud picture. Now adjust each eccentric stud one at a time in the
watch, as described in the text. Use the picture to show you the position of these
studs.
19. On each page in this book the part number and the page number are the same.
This makes it convenient for the reader and eliminates any confusion. I~.

NOMENCLATURE OF PARTS FOR
CHRONOGRAPH MECHANISM
Hour Brake Lever Spring
Assembly No.1
Hour Flyback Lever Spring
Assembly No.4
Connecting Lever
Assembly No. 3
A
Hour Flyback Lever
Assembly No. 5
Push Piece for Setting Back
to Zero Assembly No. 7
A
Hour Brake Lever
Assembly No. 2
Barrel Bridge Assembly No.5
Hour Register Wheel
Assembly No. 8 Hour Wheel Assembly No.9
Wheel Over Fourth Wheel
Assembly No. 10
Brake Lever
Assembly No. 19
Actuating Lever for Hour
Brake Assembly No. 11
Intermecilary Wheel
Assembly No. 14
A
Actuating Detent Lever
Assembly No.1 7
Chronograph Pivoted Detent ana
Actuating Detent Lever Spring
Assembly No. 12
Chronograph Pivoted Detent
Assembly No. 15
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Jotnt Hook Assembly No. 18
Flyback Lever Spring
Assembly No. 20
A
(Continued on Next Page

Minute Register
Pawl Spring
Assembly No. 23
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NOMENCLATURE OF PARTS FOR
CHRONOGRAPH MECHANISM
Minute Register Pawl Bridge
Assembly No. 21
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Trip Pin Spring
Assembly No. 30
Minute Register Hand
Minute Register Pawl
Assembly No. 22
intermittent Lever Spring
Assembly No. 28
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Trip Pin
Assembly No. 31
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Driving Pinion Tension Spring
and Dr, .ving.Pinion.
Hour Register Hand
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Seconds Wheel Tension Spring
Assembly No. 26
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Assembly No. 29
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Castle Wheel Pawl
Assembly No. 32
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ADJUSTING ECCENTRIC
STUD
DO NOT REMOVE THIS STUD
DIAL SIDE
Listed below is the adjustment controlled by eccentric stud ES-$.
1. With chronograph engaged, check to see that hour brake lever is disen-
gaged from hour register wheel.
CORRECTION: The disengaging of hour brake lever from hour register
wheel may be adjusted by adjusting eccentric stud ES-o.
2. With chronograph mechanism engaged, check to see that hour brake lever
prevents the hour flyback lever from contacting the. heart on hour regis-
ter wheel.
CORRECTION: If the hour brake lever permits the hour flyback lever to
contact the heart on hour register wheel, this condition
can be corrected by adjusting eccentric stud ES-6.
CAUTION
In disassembling or assembling chronograph it is a good policy not to turn
eccentric studs. These eccentric studs are used to adjust one part to another
and naturally in turning these studs you will lose the desired adjustment of
the chronograph mechanism which will cause the chronograph to function in-
correctly. Another reason for not turning these studs unless it is necessary
is that they soon become loose and will not hold the desired adjustment.

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ADJUSTINGECCENTRIC ANDADIUSTINGSTUDS-THINGSTO CHECK
Listed below are a number of depthings and adjustments controlled by the ec-
centric studs and adjusting studs:
1. Check depthing of wheel over fourth wheel teeth and the intermediary
wheel teeth.
CORRECTION: If this depthing is incorrect, you can correct it by adjust-
ing eccentric stud ES-l.
REFERENCE: Wheel over fourth wheel is Assembly 10
Intermediary wheel is Assembly 14.
2. Check depthings of seconds wheel teeth and intermediary wheel teeth.
CORRECTION: If this depthing is incorrect, you can correct it by adjust-
ing the adjusting stud AS-2.
REFERENCE: Seconds wheel is Assembly 25.
Intermediary wheel is Assembly 14.
3. Check depthing of intermittent wheel teeth and seconds wheel dart tooth.
CORRECTION: If this depthing is incorrect, you can correct it by adjust-
ing the adjusting stud AS-3.
REFERENCE: Seconds wheel dart tooth is Assembly 25-C.
Intermittent wheei is Assembly 29-A.
4. With the flyback lever holding the seconds wheel at a zero position, check
to see that intermittent wheel is disengaged from seconds wheel dart tooth.
CORRECTION: If intermittent wheel does not disengage from seconds
wheel dart tooth at this time, this condition may be cor-
rected by adjusting eccentric stud ES-4.
REFERENCE: Flyback lever is Assembly 18.
Seconds wheel Is Assembly 25.
5. With the flyback lever holding the minute register wheel at a zero position,
check to see that end "A" of the minute register pawl is centered between
two teeth on the minute register wheel.
CORRECTION: The minute register pawl can be adjusted so the end "A"
of this pawl is centered between two teeth on the minute
register wheel by loosening fillister head screw FS-4 and
adjusting eccentric stud ES-5. After pawl is properly ad-
justed, tighten fillister head screw FS-4.
REFERENCE: Flyback lever Is Assembly 16.
Minute register wheel Is Assembly 27.
Minute.register pawl is Assembly 22.
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ADJUSTING ECCENTRIC
STUnS
DO NOT REMOVE THESE STUDS
TRAIN SIDE
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In disassemhling or assembling chronograph, it is a good policy
not to turn eccentric studs. These eccentric studs are used to
adjust one part to another, and, naturally, in turning these studs
you will lose the desired adjustment of the chronograph mechan-
ism, which will cause the chronograph to function incorrectly. An-
other reason for not turning these studs, unless it is necessary, is
that they soon become loose and will not hold the desired adjust-
ment.
CAUTION

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DIALSIDE PART NO.1
A. DISASSEMBLYPROCEDUREOF HOURBRAKELEVER SPRING:
This spring is held in place by shouldered screw S8-1. Holdfinger on
spring when removing screw. After screw is removed, spring may be
lifted from movement.
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(The shape of screw for this part is shown at bottom of page.)
B. HAZARDSIN DISASSEMBLYOF HOURBRAKELEVER SPRING:
To avoid loss of spring or screw, hold finger 'on spring while removing
shouldered screw S8-1.
C. A8SEMBLYPROCEDUREOF HOURBRAKELEVER SPRING:
Place spring in position on plate with part "B" of spring toward center
of watch and hole in spring over proper hole in plate. Replace shoul-
dered screw S8-1 and with tweezers place end etA" of spring in notch
"B" of hour brake lever as shows in the photograph. The spring
should pivot freely under head of shouldered screw.
REFERENCE: Hour brake lever is Assembly 2.
D. FUNCTIONOF HOURBRAKELEVER SPRING:
The function of this spring is to hold a tension on the hour brake lever
to engage it with the hour register wheel.
REFERENCE: Hoor register wheel is Assembly 8.
REMARKS:
The brake lever holds the hour register wheel stationary. This in
turn holds the driving pinion stationary which causes friction between
the turning mainspring barrel and the stationary driving,pinion.
This slight braking effect on the mainspring barrel does not greatly
influence the working of the watch due to the fact that it acts on the
barrel which turns with a great amount of power. What small effect
this friction has on the watch train would in fact, when the chronograph.
is disengaged, compensate slightly for the heavy resistance to the
watch train when chronograph is engaged.
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Hour Brake Lever Spring
Assembly No.1
OILING
End H A" oi hour brake lever spring should be slightly mois-
tened with oil at the point of contact with hour brake lever 0
DIAL SIDE
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DIAL SIDE PART NO.2
A. DISASSEMBLYPROCEDURE OF HOUR BRAKE LEVER:
This part is held in place by a shouldered screw SS-2 and pivots under
the head of this screw. Remove screw, and lever may be lifted from
barrel bridge and free of movement.
(The shape of screw for this part is shown at the bottom of the page.)
B. ASSEMBLYPROCEDURE OF HOURBRAKE LEVER:
Place hole in lever over proper hole in barrel bridge, as shown in the
photograph. Now replace shouldered screw SS-2 that holds this lever in
place. This lever should pivot freely under head of screw. The screw
for this part helps to hold the barrel bridge down on plate.
C. FUNCTION OF HOURBRAKE LEVER:
The functions of the hour brake lever are:
1. It holds the hour register wheel.In a stationary position, when
permitted to do so by the chronograph mechanism.
2. It prevents the hour flyback lever from engaging with hour register
wheel, when the chronograph mechanism is engaged.
REFERENCE: Barrel bridge is Assembly 5.
Hour register wheel is Assembly 8.
Hour flyback lever is Assembly 6.
REMARKS:
When the chronograph is engaged and the hour brake lever is free of the hour
register wheel, the hour brake lever prevents the hour flyback lever from re-
turning the wheel to a zero position. This is due to the end "D" of the hour
flyback lever striking the end "A" of the hour brake lever, which prevents
the flyback lever from contacting the heart on the hour register wheel.
After replacing the hour brake lever, the hour register wheel should be
checked for proper endshake and side shake. The barrel arbor should
be checked to see that it has proper endshake and the flyback lever should
be checked to see that it pivots freely in the bridge without binding .
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Hour Brake Lever
Assembly No. 2
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OILING
The following points on hour brake lever should be slightly moistened with
oil:
1. The shoulder of screw that brake lever pivots on.
2. End HE" oi brake lever that contacts eccentric stud on connecting lever.
3. End uD" of brake lever that contacts hour flyback lever.
DIAL SIDE
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PART NO.3·
DIAL SIDE
A. DISASSEMBLY PROCEDURE OF CONNECTING LEVER:
This lever is held in place by a shouldered screw SS-3 and
pivots under head of this screw. After screw has been re-
moved, lever may be lifted from plate.
(The shape of screw for this part is shown at bottom of page.)
B. ASSEMBLY PROCEDURE OF CONNECTING LEVER:
Place hole in lever over proper hole in plate, with the eccen-
tric stud up. The end "A" of this lever should be on the in-
side of pin "A", as shown in photograph. Replace shouldered
screw SS-3 to hold this lever in position. The connecting lever
should pivot freely under head of shouldered screw.
C. FUNCTION OF CONNECTING LEVER:
The function of this lever is to disengage the hour brake lever
from the hour register wheel, when the end "A" of this lever
is forced toward the center of the watch.
REFERENCE: Hour brake lever is Assembly 2.
Hour register wheel is Assembly 8.
REMARKS:
The connecting lever disengages the hour brake lever from the
hour register wheel at the same time the chronograph mechan-
ism is engaged. This permits the hour register hand to begin
registration of the hours, the instant the second hand begins
registration of the seconds.
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Connecting Lever
Assembly No. 3
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lever
The following points on connecting lever should be slightly moistened with oil:
1. Shoulder of screw on which the connecting lever pivots.
2. End A at point of contact with pin "A" on actuating lever for hour brake.
OILING
DIAL SIDE
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DIAL SIDE PART NO.4
A. DISASSEMBLYPROCEDURE OF HOUR FLYBACK LEVER SPRING:
This spring is held in place by fillister head screw FS-I. Remove screw,
and slide end HA" of flyback lever spring from underneath barrel bridge.
Now lift spring from plate and free of movement.
(The shape of screw for this part is shown at bottom of page.)
REFERENCE: Barrel bridge is Assembly 5.
B. HAZARDSIN DISASSEMBLYOF HOUR FLYBACK LEVER SPRING:
Hold finger over spring when removing screw so that it will not be lost.
C. ASSEMBLY PROCEDURE OF HOUR FLYBACK LEVER SPRING:
Slide end "A" of spring under barrel bridge where it will contact inside
of part "B" on hour flyback lever. Tension of this spring must disengage
hour flyback lever from hour register wheel. Place hole in spring over
proper hole in plate. Hold spring in position with finger,and replace fil-
lister head screw FS-I.
REFERENCE: Hour flyback lever is Assembly 6.
Hour register wheel is Assembly 8.
D. FUNCTION OF HOUR FLYBACK LEVER SPRING:
The function of this spring is to hold the hour flyback lever disengaged
from heart on hour register wheel.
REMARKS:
The tension that any spring in the chronograph holds on a part should be
no stronger than is necessary for the spring to perform its function
properly.
For example, any excess tension that a spring holds on a part to engage it
with another part makes it unnecessarily hard to disengage the two parts.
Too strong a tension of the spring will also cause excessive wearing of
parts.
The tension of the spring to the part is properly adjusted by the factory,
but in case a spring must be made or a spring has been replaced by anoth-
er watchmaker, when adjusting the tension of this spring the above re-
marks should be taken into consideration.
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Hour Flyback Lever Spring
Assembly No.4
OILING
End "A" of hour flyback lever spring should be slightly mois-
tened with oil at point of contact with hour flyback lever.
DIAL SIDE
4-A

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DIALSIDE PART NO.5
A. DISASSEMBLYPROCEDUREOF BARRELBRIDGE:
Caution: Release power from watch train before removing this bridge.
This bridge is held in place by flllister head screw,FS-2 and steady
pins. Remove screw and loosen bridge from plate with a thin blade
screw-driver. Whensteady pins are free in plate, bridge may be
Hfted from movement.
(The shape of screw for this part is shown at bOttomof page.)
B. ASSEMBLYPROCEDUREOF BARRELBRIDGE:
Place bridge on plate,as shownin photograph,with steady pins over
proper holes in plate. Check to see that barrel-arbor pivot, hour re-
gister wheel pivot, and the screw-head on hour flyback lever are enter-
ing the proper holes in bridge. Check to see that push piece for setting
back to zero is in proper place. Nowpress the bridge downto proper
place)and replace flllister head screw FS-2. Position of this screw is
shown in the photograph. .
REFERENCE: Hour register wheel is Assembly 8.
Hour flyback lever is Assembly 6.
Push piece for setting back to zero is Assembly 7.
C. HAZARDSIN ASSEMBLYOF BARRELBRIDGE:
Before pressing the bridge down, be sure the pivots and screw
head C on the hour flyback lever are enter-ing the proper holes
in the bridge. Avoid twisting the bridge when replacing it, or the
pivots on the hour register wheel and the pivot holes in the plate
and bridge may be damaged.
D. FUNCTIONOF BARREL BRIDGE:
The functions of the barrel bridge are as follows:
1. It holds top pivot of hour register wheel in position,so this wheel
can function properly. .
2. It holds the hour flyback lever in position to function properly.
3. The push piece for setting back to zero is held in-position by this
bridge.
4. It holds the top pivot of barrel arbor in position for the barrel to
function properly.
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Barrel Bridge Assembly No. 5
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The following points on barrel bridge should be oiled:
1. The top pivot of hour register wheel should be oiled as you would
normally oil a train pivot.
2. The top pivot of barrel arbor should be oiled as you would normal-
ly oil a barrel arbor pivot in a watch.
DIAL SIDE
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5-A
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DIAL SIDE PART NO.6
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A. DISASSEMBLYPROCEDUREOF HOURFLYBACKLEVER:
Mter barrel bridge is removed, the hour flyback lever is free on
plate and can be lifted from movement.
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B. ASSEMBLYPROCEDUREOF HOURFLYBACKLEVER:
Place lever on plate with screw head "c" up, as shown in photograph,
with the threaded end of screw downin hole in plate.
C. FUNCTIONOF HOURFLYBACKLEVER:
The functions of this lever are:
1. ILdisengages the hour brake lever from hour register wheel when
hour flyback lever is forced to contact the heart on this wheel.
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2. The end "A" of hour flyback lever contacts the heart on the hour
register wheel, forcing it to a zero position, when the push piece
for setting back to zero is pushed.
3. Whenpush piece for setting back to zero is released, the flyback
lever forces this push piece toward outside of watch and holds it in
this position, until it is pushed manually.
4. Whenthe chronograph mechanism is engaged, and the hour flyback
lever is forced toward the heart on the hour register wheel, the end
"D" on the hour flyback lever will contact point "A" on the hour
brake lever. This will prevent any further movement of the hour
flyback lever toward the heart on the hour register wheel.
REFERENCE: Hour register wheel heart is Assembly 8-B.
Push piece for setting back to zero is Assembly 7.
Barrel bridge is Assembly 5.
REMARKS:
The end "A" of flyback lever should be highly polished, as any pits of
rust or roughness at this location may cause it not to function properly.
When repairing a chronograph, itIs most important that the screw-
drivers are properly sharpened and the correct size of screw-driver
blade used for each screw slot. Most of the screws used in the chron-
ograph have a highly polished head and are very easily marred by a
slight slip of the screwdriver. To have these screw heads marred,
while repairing a chronograph, will indicate carelessness either in
sharpening or the use of the screwdrivers.
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Hour Flyback Lever
Assembly No. 6
OILING
The surfa-ce of screw-head He", that contacts the barrel
bridge, should be slightly moistened with oil.
DIAL SIDE
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