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Pitch Level Backlash Inspection
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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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Pitch Level and Plumb Travel Inspection
TM 9-1240-375-34&P
0073 00
TEST AND INSPECTION - Continued
Pitch Level Backlash Inspection - Continued
NOTE
Do not go past scribed line when turning elevation knob counterclockwise. Ensure
scribed lines are in perfect alignment.
4
1 fc 4 6 5
6.
Turn elevation knob (4) at least 1/2 turn clockwise.
7.
Turn elevation knob (4) counterclockwise until scribed lines are aligned.
5
7
8
9
1 fc 4 6 6
8.
With scribed lines aligned, re-center level bubble (7) in fire control quadrant (5) if necessary using
micrometer knob (8).
9.
Record reading of micrometer (9).
10.
Compare reading with reading recorded in step 4.
11.
If readings differ over 1.5 mils, backlash is excessive. Refer to WP 0021 00 for troubleshooting. If
backlash is still excessive, return to depot maintenance.
0073 00-28

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