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TM 9-1240-375-34&P
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ASSEMBLY
2
4
1
3
5
1 fc 1 8 3
M17A1/M18A1 Quadrant
1.
Install optical instrument window (1) in quadrant cover (2).
WARNING
Use sealing compound in well-ventilated area away from open flame. Sealing
compound is harmful to skin and clothing and may give off harmful vapor. Exercise
care whenever sealing compound is used.
2.
Apply a light coat of sealing compound (item 13, WP 0152 00) in channel around optical instrument
window (1) and to threads of two machine screws (3).
3.
Install window plate (4), two new lockwashers (5) (item 8, WP 0114 00), and two machine screws (3).
2
6
8
9
7
1 fc 1 8 4
M17A1/M18A1 Quadrant
4.
Install optical instrument window (6) in quadrant cover (2).
5.
Apply a light coat of sealing compound (item 13, WP 0152 00) in channel around optical instrument
window (6) and to threads of two machine screws (7).
6.
Install window plate (8), two new lockwashers (9) (item 8, WP 0114 00), and two machine screws (7).
0053 00-4
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