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Cross Level Mechanism Travel 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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Boresight Adjustment Inspection
TM 9-1240-375-34&P
0082 00
Eccentric Stud Assembly Adjustment
5
5
1
1
2
3
2
3
6
4
1 fc 5 5 6
1 fc 5 5 5
1.
Place plate-mounted level (1) parallel to block (2) on shaft of optical equipment test fixture (3).
2.
Turn cant handwheel (4) until bubble (5) in plate-mounted level (1) centers.
3.
Place plate-mounted level (1) 90 degrees to block (2) on optical equipment test fixture (3).
4.
Turn elevation handwheel (6) until bubble (5) in plate-mounted level (1) centers.
8
7
9
10
1 fc 5 5 7
5.
Place fire control quadrant (7) on seats on M172/M172A1 mount. Level bubble (8) in fire control
quadrant should center.
6.
If level bubble (8) is not centered, adjust eccentric stud assembly (9).
a.
Loosen eccentric stud assembly (9) to disengage from spline plate (10).
b.
Turn eccentric stud assembly (9) and engage spline plate (10). Tighten eccentric stud assembly.
7.
Repeat step 5. If level bubble in fire control quadrant does not center, repeat step 6 until centered.
0082 00-9

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