DISASSEMBLY -820360588

TM 9-1240-375-34&P

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DISASSEMBLY

WARNING

RADIATION

TRITIUM

GAS (H3)

When maintaining radioactively illuminated fire control equipment, follow radiation

hazard procedures in warning summary (M137 only).

Remove two machine screws (1) and two lockwashers (2). Discard lockwashers.

NOTE

Scribe lines on stop and on counter box assembly to aid in proper realignment during

assembly.

Lift up and remove stop (3) from counter box assembly (4).

Remove pantel eccentric (5).

Remove O-ring (6) from pantel eccentric (5). Discard O-ring.

Remove two machine screws (7), two lockwashers (8), stop (9), and pantel eccentric (10). Discard

lockwashers.

Remove O-ring (11) from pantel eccentric (10). Discard O-ring.

NOTE

Rotating counters (12 and 13) are not interchangeable. Mark rotating counters to

identify for assembly.

Remove two machine screws (14) and two lockwashers (15). Discard lockwashers.

Remove two machine screws (16) and two lockwashers (17). Discard lockwashers.

Rotate lower counter shaft of optical element gear block assembly (18) so that slot in lower counter

shaft is in upright position.

10.

Rotate upper counter shaft of optical element gear block assembly (18) so that slot in upper counter

shaft is in upright position.

11.

Remove rotating counters (12 and 13) with bracing plate (19).

12.

If either rotating counter (12 and/or 13) is damaged or is being replaced, replace both rotating counters

but first remove two headless straight pins (20 and 21) and two couplings (22 and 23).

13.

If damaged, discard both rotating counters (12 and 13) with bracing plate (19).

14.

Remove three socket head capscrews (24), three lockwashers (25), and rotating counter (26) with

counter mount (27). Discard lockwashers.

15.

Remove four socket head capscrews (28), four lockwashers (29), and counter mount (27) from rotating

counter (26). Discard lockwashers.

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