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ASSEMBLY -820360551
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TM-9-1240-375-34-P Quadrant Fire Control: M17 (1290-01-037-3883) and M17A1 (1290-01-515-8260); Mount Telescope and Quadrant: M171 (1240-01-039-7273) Manual
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ASSEMBLY - continued -820360553
TM 9-1240-375-34&P
0093 00
ASSEMBLY - Continued
11.
Apply 0.063 in. (1.600 mm) bead of sealing compound (item 13, WP 0152 00) around entire rim of
optical instrument window (10). Place optical instrument window in head housing (2).
12.
Apply a light coat of grease (item 15, WP 0152 00) to nonmetallic round seal (11) and install over
optical instrument window (10).
13.
Place cover assembly (12) in position on head housing (2).
14.
Apply a coat of sealing compound (item 13, WP 0152 00) to threads of four machine screws (13) and
install to secure cover assembly (12).
15.
Apply a coat of grease (item 15, WP 0152 00) to new O-ring (14) (item 14, WP 0134 00) and install on
threaded machine plug (15).
16.
Apply a light coat of grease (item 16, WP 0152 00) to detent plunger (16) and install in head housing
(2).
17.
Apply sealing compound (item 13, WP 0152 00) to threads of machine threaded plug (15).
18.
Install compression helical spring (17) and machine threaded plug (15).
19.
Apply a coat of grease (item 16, WP 0152 00) to flat washer (18) and install in head housing (2).
20.
Apply a light coat of grease (item 16, WP 0152 00) to plunger (19) and screw into telescope actuator
(20). Install assembled plunger and telescope actuator into head housing (2).
21.
Apply a coat of grease (item 15, WP 0152 00) to new O-ring (21) (item 8, WP 0134 00) and install in
machine threaded bushing (22).
22.
Screw machine threaded bushing (22) into head housing (2).
23.
Apply sealing compound (item 13, WP 0152 00) to threads of external screw (23) and install.
24.
Apply sealing compound (item 13, WP 0152 00) to setscrew (24) and install to prevent machine
threaded bushing (22) from turning.
25.
Position knob (25) on telescope actuator (20) and secure in place using two setscrews (26) which have
been coated with sealing compound (item 13, WP 0152 00).
26.
Apply a coat of sealing compound (item 13, WP 0152 00) to threads of safety relief valve (27) and
install.
0093 00-6

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