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COUNTER BOX ASSEMBLY (PARTS) MAINTENANCE
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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 -820360589
TM 9-1240-375-34&P
0099 00
DISASSEMBLY
WARNING
TRITIUM
GAS (H3)
When maintaining radioactively illuminated fire control equipment, follow radiation
hazard procedures in warning summary (M137 only).
1.
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.
2.
Lift up and remove stop (3) from counter box assembly (4).
3.
Remove pantel eccentric (5).
4.
Remove O-ring (6) from pantel eccentric (5). Discard O-ring.
5.
Remove two machine screws (7), two lockwashers (8), stop (9), and pantel eccentric (10). Discard
lockwashers.
6.
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.
7.
Remove two machine screws (14) and two lockwashers (15). Discard lockwashers.
8.
Remove two machine screws (16) and two lockwashers (17). Discard lockwashers.
9.
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.
0099 00-2

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