Bulova 11 ANAC Service manual

The oscillating weight, held down by a screw gib and made
of antimagnetic alloy, is mounted on its axle located in the
center of the movement and is free to swing in either
direction. Whether the weight turns clockwise or counter-
clockwise, winding of the mainspring occurs.
Mounted on the train bridge, named for this reason,
«combined bridge», the 'automatic mechanism consists of
the oscillating weight and its gear, two reversing gear units
which transmit winding to the crown and ratchet wheels by
the intermediary of a reverser converting wheel, a reduction
gear and a driving gear for crown wheel.
Each reversing gear unit consists of a reversing gear and
a reversing gear pinion, the latter being held in position by
a spring. Whichever way the weight turns, the reversing
gear meshes with the automatic train while the other slips.
In any case, a fairly continuous self-winding action will
follow.
Should the watch be wound by stem and crown, the crown
wheel will make the automatic train turn, but both
reversing gear pinions will slip, therefore causing no inter-
ference with the automatic mechanism.
DIAL SIDE TRAIN SIDE
Height
4.50 mm
4.50 mm
5.20 mm
---_~_--_~--- ----- -_~ - _._------- _~_--- ---- ~- ---- - -- -=--------- -
Scale 1:1
Specifications
Movement Automatic mechanism
11112 Ligne, lever escapement
Diameter of the plate 25.60 mm
Unbreakable and self-lubricated
mainspring
Total running time: 42 hours
Screwless beryllium balance
Compensating alloy hairspring
21,600 beats per hour
Adjustable stud holder
Kif Elastor shock-resistant device
Angle of Lift (Pallet contact): 51°
DESIGNATION OF TYPES
Caliber Description
11 \NAC
11 ANACD
11 ANACB
automatic, with center sweep-second
automatic, calendar with center sweep-second
automatic, day and date with center sweep-second

Characteristics
11ANAC
1. The oscillating weight arbor is
soldered to the combined bridge.
In the rare case that it might be
necessary to replace it, a new com-
bined bridge is required.
2. The minute wheel spring has been
riveted to the pillar plate in order to
make sure that the watchmaker will
not lose it or forget to replace it after
servicing. It is, therefore, part of the
pillar plate and not available sepa-
rately.
3. Beryllium-made bushing for the top
pivot of the sweep second wheel is
fitted inside the bottom part of the
oscillating weight arbor and for that
reason oiling is done through the
oscillating weight arbor with an
appropriate oiler. Bulova recommend
oiling this bushing from under the
bridge, before setting the latter.
Disassembling the
watch
Uncasing
Excluding the one-piece, «rnonocoque»
cases, the movement is normally held
in the case by two casing clamps (191)
and two casing screws (45C).
Removing the dial
After removing the hands and releasing
the two lateral dial screws (47), the
dial may be removed. The day star with
dial disk (591) can be lifted up and after
removing the three date indicator
guard screws (577), the day and date
mechanisms can be removed.
A dial rest (148) is used for day date
watches (caliber 11 ANACB) having a
flat dial.
Checking the automatic gear
By moving the oscillating weight (344)
in both directions, the transmission of
the power from the oscillating weight
(344) to the ratchet wheel (13) can be
checked.
Removing the oscillating weight
The oscillating weight is held in place
by a gib (343). To remove it, unscrew
the gib screw (336) and remove the gib.
.~
, .
, f
Figure 1
Removal of the balance wheel and
pallet
Figure 2
Removal of the barrel
--- •.••0
Releasing the mainspring
With the oscillating weight (344)
removed, the mainspring can be re-
leased by simultaneously disengaging
the ratchet click (32) from the ratchet
wheel (13) and pressing with a pointed
tool on one arm of the breguet spring
(326) through the hole made in the
upper bridge for automatic device (341).
Turn the winding crown one quarter of a
turn forward and then let the automatic
train «run down" by turning the winding
crown slowly backwards.
NOTE: Simultaneous disengaging of the
ratchet click (32) from the ratchet
wheel (13) and pressing on the breguet
spring (326) can be done easily with
one hand, using a tweezer sufficiently
open to hold the ratchet click with
one point and pressing on the breguet
spring with the other.
2
Cleaning the escapement
As shown in figure 1, the balance and
pallet are readily removed without
disassembling any other parts of the
movement.
The mainspring barrel
Figure 2 shows how easily the main-
spring barrel (1S) is removed without
disassembly of the self-winding
mechanism. The mainspring arbor must
make six full turns before the brake
spring slips, which represents a total
running time of over 40 hours.
An unbreakable and life-time lubricated
mainspring -is used. Therefore, periodic
cleaning of the barrel and mainspring
is unnecessary.
RECOMMENDATION:
Do not dismantle the mainspring barrel.
In case of difficulty, replace the barrel
(1S) complete.

Reassembling and
oiling the watch
Dial side
1. The functions of the winding
mechanism must be lubricated as
usual.
2. The centre stud (106 C) requires
no lubricant, for the cannon pinion
(94 A) must turn freely on the stud.
3. Lubricate the pivot of the minute
wheel (8) and before setting the lat-
ter, make sure that the minute wheel
spring, which is riveted in the pillar
plate, is properly set, i. e. that it is
pressing against the pivot of the
minute wheel.
4. After setting the minute work cock
(9) it is very important to check the
endshake and the freedom of the
cannon pinion (94 A) and to make
sure that the minute wheel spring is
pressing the minute wheel against
the cannon pinion (94 A).
Train side
1. Before installing the gear train,
lubricate the cannon pinion of the
large driving wheel (4 F) as shown
~ ..•..Figure 3
The minute wheel spring
The date indicator driving spring stop pin
~ Figure 5
Oiling of the cannon pinion of the large driving wheel
366
308
317
317D
..•..Figure 4
The automatic gear train
in figure 5. When setting the hands,
the cannon pinion slips on the
wheel, that is why it is necessary to
make sure that the friction (torque)
between the cannon pinion and the
wheel is correct. Neither too loose,
nor too tight.
2. Install the gear train, the breguet
spring (326) if removed, and affix
the combined bridge (226).
NOTE: We recommend oiling the
top pivot of the sweep second
wheel (6 K) on the bushing fitted
under the oscillating weight arbor
BEFORE setting the bridge.
3. Install the mainspring barrel and its
bridge.
4. Lubricate gear train (if the top
bushing for sweep second wheel
has not been oiled before setting
the bridge, lubricate through the
oscillating weight arbor with an
appropriate oiler).
5. Lubricate lower bearings of the
automatic train.
6. Lubricate reversing gear stud.
7. Lubricate teeth of both reversing
gears.
8. Install automatic mechanism (as
shown in figure 4) and lubricate
upper pivots.
3
9. Install, lubricate and adjust as
necessary pallet and balance
assemblies with bridges.
10. Affix the osc.llatlnq weight and
lubricate its arbor and gib.
Checking the automatic winding
Wind up the mainspring six turns. Hold
the movement or the watch in a verti-
cal plane and turn it slowly round the
axis of the hands. The oscillating weight
will now wind up the mainspring and it
should drop under its own weight
without being carried over the top.
Malfunction may be caused byexces-
sive tension of the breguet spring (326)
or by friction elsewhere.
Checking the minute wheel
spring
After affixing the dial and hands, it is
recommended to check the functioning
of the minute wheel spring by pushing
forward the minute hand (clockwise)
with the aid of a pegwood stick. Under
the tension of the minute wheel spring,
the minute hand must always come
back to its original position. This is
necessary in order to overcome normal
back-lash in the hands caused by the
cannon pinion turning freely on the
center stud.

344 Oscillating weight, mounted
571 Date indicator guard
574 Date indicator driving wheel
576 Date indicator
577 Date indicator guard screw
578 Date jumper spring
581 Intermediate date wheel
596 Date jumper
148 Dial rest
344 Oscillating weight, mounted
571 Date indicator guard
574 Date indicator driving wheel
576 Date indicator
577 Date indicator guard screw
578 Date jumper spring
581 Intermediate date wheel
586 Day jumper
591 Day star with dial disk
596 Date jumper
609 Intermediate day wheel
611 Day jumper spring
612 Day mechanism guard
613 Day device guard screw
All information contained in this bulletin
is based on the latest product infor-
mation available at the time of printing.
The right is reserved to make changes
at any time without notice.
11 ANACD Additional or varying parts from 11 ANAC
Scale 1:1 Scale 3:1
11 ANACB Additional or varying parts from 11 ANAC
~ ..
148
344 574
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,"''Ob
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'vfl.
578 581 586
/ij ~2Rl;'<>/
596 609 611
591
613
612
Scale 1:1 Scale 3:1
NOTE: There are several different types of dial rests (148) and date indicators (576) used '---
for watches of 11 ANACB caliber. When ordering these parts, please mention the case=' -
reference engraved on the inside of the case back.
When ordering Day star with dial disk (591), please specify the language and colour
desired.
Printed in Switzerland 8.1. - 1969 - 24000
6

Parts Index
1.S
4.F
5
6.K
7
8
9
13
14
16
17
18
23
24
25
26
28
29
31
32
35
37
37 0
38
39
41
44
44 A
45 C
47
48
51
54
54 A
54 B
56
57
58
59
60
62 A
63
64
65 C
70 L
70 R
85.A
94 A
106
111
Barrel complete
Large driving wheel with cannon
pinion
Third wheel
Sweep second wheel
Hour wheel
Minute wheel
Minute wheel bridge
Ratchet wheel
Crown wheel
Winding stem
Clutch wheel
Winding pinion
Stud holder
Clutch lever
Setting lever
Clutch lever spring
Setting lever spring
Setting wheel
Ratchet click spring
Ratchet click
Regulator
Bridge screw
Combined bridge screw,
special
Balance cock screw
Pallet bridge screw
Ratchet wheel screw
Screw for setting lever spring
Screw for minute wheel bridge
Casing clamp screw'
Dial screw
Setting lever screw
Hairspring stud screw
Balance complete
Balance with roller
Balance
Balance staff
Pallet fork complete
Pallet arbor
Escape wheel
Roller
Hairspring stud
Minute hand
Hour hand
Sweep second hand
Exit pallet jewel
Entry pallet jewel
Hairspring collet
Cannon pinion without clam
notch
Center pipe
Upper block «KIF ELASTOR»,
complete
Lower block «KIF ELASTOR»,
complete
Minute wheel spring ••
Casing clamp'
Pillar plate'
Barrel bridge'
Balance bridge *
Pallet bridge *
Combined bridge'
Reduction gear
Connecting wheel for auxiliary
reverser
Reversing gear pinion
Reversing gear
Oscillating weight axle *.
Breguet spring
Screw for upper bridge of auto-
matic device
Screw for screw gib
Breguet spring screw
Upper bridge for automatic
device
Screw gib
Oscillating weight, mounted
Driving gear for crown wheel
11 ANAC parts
/ .
4F
I
-lUL~_
-L
l
®®~@
.,
5
6K
7
8
9
~)
13
f~?)
14
=:;1 ===
16 17 18 23 24
112
129
191
201
203
212
216
226
308
317
317 C
317 0
322
326
334
336
337
341
343
344
366
26 28
54A 548
65 C
326
(I
,, .
) ~
29 31
...L,
J"
$:
57 59
e
,@
106 111 112
32 35
60 63 64
25
94A 317 317C308
341
W
oo
'. 7~. _
·QV I
. '-~
E,l ~t.
344
343
54
317D
366
---
Scale 1:1
~~~
"'i f"
~
V
y
i
w
~
~~
'"
s
~~
8
Ii
37 37D 38 39 41 44 44 A 47 48 51
A
"
+
0
lJ}
e
"
~ ~
v
~~
56 58 62A 70 L 70R 85A 334 336 337
e"
~
:., -" '-.
Scale 3:1
• not illustrated •• not available separately
5

Oiling recommended
1. Winding mechanism
2. Setting wheel posts
3. Minute wheel pivot
4. Cannon pinion of the large
driving wheel (94 A)
5. Gear train
6. Barrel arbor
7. Post of connecting wheel for
auxiliary reverser (317)
8. Crown wheel post
9. Teeth of both reversing
gears (317 C - 317 D)
10. Automatic train
11. Pallet stones
12. Balance wheel
13. Oscillating weight arbor (322)
and gib (343)
14. Post of intermediate date
wheel (581)
15. Post of date indicator driving
wheel (574)
16. Post of intermediate day
wheel (609)
17. Date indicator driving stop pin
(see fig. 3)
18. Function of date jumper (596)
19. Function of day jumper (586)
20. Day star (591)
21. Pin of date indicator driving
wheel (574)
NOTE: The cannon pinion (94 A) turning
on the center stud (106 C), the pivots
of the pallet (57) and the pivoting posts
of the day and date jumpers (586 and
596) require no lubrication.
The day and date
mechanism
Type
This movement is equipped with an
«instant date change" mechanism,
which means that the date indicator
jumps instantly at midnight, while the
day disk starts moving slowly at about
10 p. m., to change to the next day at
approximately midnight.
Disassembling and reassembling
Because of the 'simplicity of the system,
disassembly and reassembly of the day
and date mechanism can be done
without any difficulty. However, to set
the day star with dial disk (591) when
reassembling the day and date mecha-
nisms, it is important, to eliminate
damage of the finger of the date indi-
cator driving wheel (574), to proceed as
follows:
1. Make sure that the finger of the date
indicator driving wheel (574) does not
interfere with the teeth of the inter-
Moebius
8300
8300
8300
8030
9010
8030
Figure 7
The day and date mechanism
The date indicator driving wheel finger
8300
8300
8300
8030
941
9010
8300
8300
Figure 6
The calendar mechanism
8300
8300
8030
8030
8030
8030
8030
mediary day wheel (609) but is
positioned on the other side, as
shown in figure 7.
2. Keep slight pressure on the day dial
disk (591) and with the aid of a
pointed tool, through the hole, pull
the day jumper (586) backwards
(against the stem) in order to set it
between two teeth of the day star.
NOTE: Should the calendar jump two
days instead of one, check and if
necessary increase the tension of the
date jumper spring (578).
Checking the movement in the
case
1. After fitting the movement into the
case, make certain the oscillating
weight functions normally with no
contact against the back of the case.
2. By turning the winding crown, make
sure that the day and date indicators
jump correctly at approximately
12 o'clock (midnight).
4
Setting the day and date
1. Set the day by turning the hands
clockwise or counter-clockwise until
the right day appears in the dial
aperture.
2. Set the date by moving the hands
back and forth between 12 o'clock
(midnight) and 8 o'clock until the
desired date is reached.
(Each time, the day will turn back
and return again to the correct day).
NOTE: To advance the date without
changing the day after months having
less than 31 days, turn the hands back
wards to 8 o'clock (20.00 hours) and
then advance them again until the pro-
per date of the following month appears.
3. Set the time by turning the hands
forward to correct time.
NOTE: If the time of day is afternoon
(p. m.) continue to turn hands past
12 o'clock noon before stopping at the
correct time. This action assures proper
day and date advance in relation to
time-of-day hands.