TM 91290-357-15
5-9. Disassembly of Telescope and Main
located in appendix B.
Body Assemblies
f. Unscrew and remove the releasing plunger
(1), washers (2) and (3), and locking plunger
located in appendix B.
(4) with associated components.
a. Loosen set screw (1), which locks eleva-
Note. When removing the locking plunger hold the yoke
tion screw (2), adjusting plug (3), in body (4).
(5) down to prevent the needle lifting spring (6) from
b. Unscrew plug (3) and remove compression
forcing yoke (5) upward.
spring (5).
g. Lift off the yoke (5).
c. Remove setscrews (6) from trunnion hold-
h. Remove the detent ball (7) and spring (8).
ing screws (7).
i. Remove the screw (9) which secures the
d. Unscrew and remove holding screws (7).
spring (6), and remove spring.
e. Remove screws (8), and washers (9).
needle dial (10) and body (11) to insure the
f. Remove bracket (10), then remove telescope
same positioning of the index upon assembly.
assembly (11).
k. Remove the screws (12) securing dial (10)
Note. Place an identification mark around the bracket
for the correct positioning upon assembly.
to body (11). Remove the dial.
l. If pivot (13) is defective remove pivot from
5-10. Disassembly of Elevation Mechanism
body (11).
and Associated Parts.
Note. Turn body upside down and drive pivot from body.
located in appendix B.
a. Drive out taper pin (12) securing knob (13)
to elevation screw (2) Remove the knob.
Assembly
b. Remove setscrew (14).
B4, located in appendix B.
c. Unscrew and remove retaining ring (15).
a. Unscrew and remove the level assembly (14)
d. Turn elevation screw (2) counterclockwise
and washer (15).
and remove screw from body (4).
located in appendix B.
5-11. Disassembly of Magnetic Needle, Body
and Associated Part.
b. Loosen adjusting screws (1) in cap (2)
and unscrew cap from support (3). Remove the
located in appendix B.
retainer washer (4) and vial (5).
a. Remove screw (1) which secures the front
end piece (2) and gasket (3) to body (4) and
5-13. Disassembly of Magnetic Needle
lift off the piece and gasket.
Magnifier Assembly
Note. Remove screw (7) and notation strip (8) only if
required.
located in appendix B.
b. Release needle (6) by pressing inward the
a. Remove screws (1) which secure rear end
olive drab colored magnetic needle releasing plun-
piece (2) to body (3), work end piece free from
ger button located on side of body (4).
the sealing compound and synthetic paint and
remove gasket (4).
c. Remove the window assembly (5) forward.
b. Remove screws (5) which secure the clamp-
Note. Carefully clean window with lens tissue paper,
ing shoes (6). Remove shoes.
wrap in lens tissue and store assembly in a safe place
until reassembly.
c. Loosen tangent setscrew (7) and extract the
d. Remove needle (6) by lifting needle in a
reticle holder (8) with reticle (9).
straight upward direction.
Note. If reticle is to be replaced, place holder in ethyl
e. Wrap needle in lens tissue paper and store
alcohol to dissolve the glass cement which holds reticle in
in a safe place until assembly.
place and remove reticle.
5-2
