TM
55-6680-234-40
jewel a sharp blow with a pointed
c. Disassemble front plate and shaft assem-
bly. (See figure 8.)
object and shaking out the pieces.
(1) Dial screws (1) are secured with a
The replacement bearing will fit in
locking cement; break seal to re-
the area previously intended far the
move.
jewel.
(2) Remove screws (22) and lockwashers
(21) from rear plate (20). Remove
d. Disassemble front motor assembly as fol-
hex head screw (13), lockwasher
lows. (See figure 9.)
(14), and flat washer (15) and re-
move hairspring assembly.
and 11) should not be exposed to an open
(3) Remove bearing (3) from dial plate
magnetic circuit which would occur at any time
(4) and bearing (17) from plate
(20). Do not remove jewel (6) from
that they were not surrounded by suitable
metal. To avoid such exposure during disas-
front shaft (7) unless defective. Re-
moval of a defective jewel is facili-
sembly, hold magnet keepers 1489036-l against
tated by first breaking up the jewel
return paths (10 of figures 9 and 11) and slide
with a sharp-pointed punch so the
magnet assemblies from the motor assemblies
pieces can be shaken out.
directly into the magnet keepers. Screw (8 of
Note. Indicators with serial numbers 1
should not be removed unless defective. If re-
through 799 have a jewel (3) in plate (4)
moved, it should be replaced by a magnetic
and a jewel (17) in rear plate (20). (See
screw. Place magnet keepers in a non-magnetic
(4) Refer to figure 8. Plate (4) contain-
container or on a nonmagnetic surface. Do
ing jewel (3) must be replaced with
not allow magnets to short by contacting other
magnets or metals such as the surfaces of
a properly machined plate 1490664-
13.
steel benches. Do not disassemble magnetic
(5) The removal of jewel (17) in plate
assemblies (1 of figures 9 and 11). If defective
(20) is facilitated by striking the
replace as an assembly.
Figure 2. Modification of Front Plate.
7
