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 TM 9-1240-375-34&P
0098 00
DISASSEMBLY
WARNING
TRITIUM
GAS (H3)
When maintaining radioactively illuminated fire control equipment, follow radiation
hazard procedures in warning summary (M137 only).
1.
Remove headless straight pin (1) from knob (2) and remove knob.
2.
Remove nonmetallic seal (3) from counter box assembly (4). Discard nonmetallic seal.
3.
Remove two machine screws (5) and window retaining plate (6).
4.
Carefully remove sealing compound from edge of optical instrument window (7). Remove optical
instrument window and window mask (8).
5.
Remove two machine screws (9) and window retaining plate (10).
6.
Carefully remove sealing compound from edge of optical instrument window (11). Remove optical
instrument window and window mask (12).
7.
Remove two machine screws (13) and window retaining plate (14).
8.
Carefully remove sealing compound from edge of optical instrument window (15). Remove optical
instrument window.
9.
Remove two externally relieved screws (16), two lockwashers (17), and access cover (18). Discard
lockwashers.
10.
Remove 12 machine screws (19), 12 lockwashers (20), and counter housing cover (21). Discard
lockwashers.
11.
If damaged, remove two machine screws (22) and spacer (23) from counter housing cover (21)
(M137A2/M137A3 only).
12.
Remove and discard gasket (24).
13.
Remove two machine screws (25), two lockwashers (26), and knob assembly (27). Discard lockwashers.
14.
Remove O-ring (28) from knob assembly (27). Discard O-ring.
15.
Remove four machine screws (29), four lockwashers (30), and stop plate (31) (M137 only). Discard
lockwashers.
16.
If loose or damaged, remove two headless straight pins (32) (M137 only).
0098 00-2
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