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Cant Backlash Inspection - Continued -820360433
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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 Backlash Inspection
TM 9-1240-375-34&P
0073 00
TEST AND INSPECTION - Continued
Cant Backlash Inspection - Continued
9
7
8
10
1 fc 4 6 1
10.
With scribed lines aligned, recenter level bubble (8) in fire control quadrant (7) if necessary, using
micrometer knob (9).
11.
Record reading of micrometer (10).
12.
Compare reading with reading recorded in step 6.
13.
If readings differ over 1.5 mils, backlash is excessive. Refer to WP 0022 00 for troubleshooting. If
backlash is still excessive, return to depot maintenance.
Pitch Level Backlash Inspection
NOTE
Final movement of cross level knob and elevation knob should be a clockwise motion
when centering cross level vial and elevation level vial.
4
3
2
1
1 fc 4 6 2
0073 00-26

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