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HEAD ASSEMBLY MAINTENANCE -820360547
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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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DISASSEMBLY - continued -820360549
TM 9-1240-375-34&P
0093 00
DISASSEMBLY
WARNING
TRITIUM
GAS (H3)
When maintaining radioactively illuminated fire control equipment, follow radiation
hazard procedures in warning summary (M137 only).
1.
Remove safety relief valve (1) from head housing (2).
2.
Remove two setscrews (3) and knob (4).
3.
Remove sealing compound and setscrew (5).
4.
Unscrew machine threaded bushing (6) and remove.
5.
Remove O-ring (7) from inside of machine threaded bushing (6) and discard.
6.
Remove external screw (8).
7.
Remove telescope actuator (9), plunger (10), and flat washer (11) from head housing (2).
8.
Unscrew plunger (10) from telescope actuator (9).
9.
Unscrew machine threaded plug (12).
10.
Remove compression helical spring (13), detent plunger (14), and O-ring (15). Discard O-ring.
11.
Remove four machine screws (16) and cover assembly (17) from head housing (2).
12.
Carefully remove nonmetallic round seal (18).
CAUTION
Glass can be damaged and scratched if handled carelessly and excessively.
13.
Remove sealing compound and remove optical instrument window (19).
14.
Remove sealing compound and unscrew prism pivot (20).
15.
Remove three machine screws (21) and plate cover (22).
NOTE
Check position of prism pivot before removing four setscrews.
16.
Remove sealing compound and four setscrews (23).
17.
Pull prism pivot (24) from head housing (2).
18.
Remove O-ring (25) from prism pivot (24). Discard O-ring.
0093 00-2

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