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Cross Level Mechanism Backlash Inspection - continued
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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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Eccentric Stud Assembly Adjustment
TM 9-1240-375-34&P
0082 00
TEST AND INSPECTION - Continued
Cross Level Mechanism Travel Inspection
3
1
4
2
1 fc 5 5 1
1 fc 5 5 2
1.
Place plate-mounted level (1) on block (2), perpendicular to axis of rotation.
2.
Level optical equipment test fixture (3) in cant and elevation.
3.
Set fire control quadrant (4) at 600 mils.
4
6
6
4
5
5
7
1 fc 5 5 3
1 fc 5 5 4
4.
Turn cross level knob (5) until level bubble (6) in fire control quadrant (4) centers.
5.
If cross level knob (5) stops before level bubble (6) in fire control quadrant (4) centers, M172/M172A1
mount is defective.
6.
Reverse fire control quadrant (4).
7.
Turn cross level knob (5) until level bubble (6) in fire control quadrant (4) centers.
8.
If cross level knob (5) stops before level bubble (6) in fire control quadrant (4) is centered,
M172/M172A1 mount is defective.
9.
Set fire control quadrant (4) to zero and relevel mounting bracket (7).
0082 00-8

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