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 TM 9-1240-375-34&P
0090 00
ASSEMBLY
WARNING
TRITIUM
GAS (H3)
When maintaining radioactively illuminated fire control equipment, follow radiation
hazard procedures in warning summary (M137 only).
1.
If instruction plate (1) is to be replaced, stamp 2.7 curies blank and stamp month and year light source
was manufactured on new instruction plate. Install instruction plate (1) with two new lockwashers (2)
(item 33, WP 0141 00) and two machine screws (3) (M137 only).
WARNING
Use sealing compound in well-ventilated area away from open flame. Sealing
compound is harmful to skin and clothing and may give off harmful vapor. Exercise
care whenever sealing compound is used.
2.
Apply sealing compound (item 13, WP 0152 00) to threads of two machine screws (4).
3.
Install cover assembly (5), two new lockwashers (6) (item 36, WP 0141 00), and two machine screws (4).
4.
Apply sealing compound (item 13, WP 0152 00) to fluid valve stem (7).
5.
Install one end of retaining strap (8) on fluid valve stem (7) and install in counter box assembly (9).
6.
Install valve core (10).
7.
Install the other end of retaining strap (8) on air valve cap (11) and install.
8.
If removed, install two headless straight pins (12) in bottom of counter box assembly (9). If headless
straight pins are loose, ream holes for next larger size headless straight pins and install (M137A2/
M137A3 only).
9.
Apply sealing compound (item 13, WP 0152 00) to threads of four machine screws (13)
(M137A2/M137A3 only).
10.
Position stop plate (14) on counter box assembly (9) and secure in place with four new lockwashers (15)
(item 15, WP 0141 00) and four machine screws (13) (M137A2/M137A3 only).
0090 00-6
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