TM 55-6680-234-40
front shaft (7) and insert rear end
(2) Install bearing (12) and rotor as-
of shaft into bearing (17) in rear
s e m b l y (14) into housing (11).
plate (20), Assemble dial (2) on dial
(Front rotor assembly has hollow
plate (4) with bottom of dial in line
shaft. )
with groove on boss of dial plate.
(3) A shim (3 of figure 10) of proper
Use shims (18) as required to obtain
thickness is selected to obtain prop-
end play of 0.013 to 0.020 inches.
er end play of front rotor assembly
Reassemble dial `plate.
(14 of figure 9). Insert a trial shim
(7) Secure dial screws in position by
(3 of figure 10) and bearing (2 of
sparingly applying purple glyptol
lacquer 2V903 manufactured by
of rear plate and shaft assembly. In-
General Electric Company. Any
stall front motor assembly on plate
equivalent cement is suitable.
(4 of figure 10) and check end play
h. Reassemble rear plate and shaft assem-
of shaft assembly. Install shims as
bly and associated components aS follows.
required to obtain end play of
(See figure 10.)
0.0012 to 0.0020 inch. Secure front
(1) Align and press roll pin (5) into
motor assembly loosely on plate (4)
hole in plate (4) to such a distance
of rear plate and shaft assembly (fig-
that its tip extends 0.080 inch from
flat rear surface of `plate. Align and
and lockwashers (16 of figure 4).
insert bearing (6) into plate (4). In-
(4) Place magnet keeper 1489071 con-
sert bearing (6) until its forward
taining front rotor assembly (14)
surface is flush with bottom of bear-
against stator assembly and slide ro-
ing housing on front of plate (4).
tor assembly directly from magnet
(2) If hairspring assembly was removed,
keeper into stator assembly.
assemble balance wheel (8) on rear
(5) Place magnet keeper 14890361 con-
shaft (7). Secure in position with
taining front magnet assembly (1)
the cement specified in g(5) above.
against return path and slide magnet
Install hairspring shield (10), shim
assembly directly from magnet keep-
(11), and hairspring (12) on rear
er into return path. (Front magnet
shaft as outlined for these same re-
assembly (1 of figure 6) is identical
spective components of g(5) above.
to rear magnet assembly except for
Install hairspring plate (16) on rear
differences in pivot screw (2 of fig-
plate (18). Secure with screw (13)
and washers (14 and 15) approxi-
net assembly has larger through-hole
mately at midpoint of adjustment
and larger counterbore. Secure mag-
slot.
net assembly on front end of shaft
(3) Insert rear end of rear shaft (7) in-
with set screw (7). Sparingly apply
to bearing (17) in rear plate (18).
sealant conforming to Specification
(4) Install plate (4) on assembled com-
MIL-S-22473 to threads of set screw
ponents and shim bearing (6) for
(7) to secure it in position.
shaft end play of 0.0013 to 0.0020
j. Reassemble rear motor assembly and as-
inches.
sociated components in a manner similar to
i. Reassemble front motor assembly and
that described in i above for the front motor
associated components as follows: (See fig-
assembly. (See figure 11.) A shim (21 of
(1) Turn hex nut (9) on screw (8) and
obtain proper end play of rotor assembly (14
thread screw into return path (10).
of figure 11). Insert a trial shim (21 of fig-
Insert return path into housing (11);
secure with screws (17) and washers
(22 of figure 7). Install rear motor assembly
(15 and 16).
on plate (22 of figure 7). Check for end play
13
