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TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download

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TM 9-1240-401-34&P 4-49 a. SETTING UP AND ADJUSTING THE CROSS-LEVELING FIXTURE 1 Secure cross-leveling fixture (1) on a solid stand bolted to the floor. 2 Place precision level (2) on square shaft (3), per- pendicular to axis of rotation, and center bubble. 3 Place precision level (2) on square shaft (3), paral- 4 5 6 7 8 Iel to axis of rotation, and center bubble. Set cant vernier scale (4) and elevation vernier scale (5) to "0". Mount fixture adapter (6) on cross-leveling fixture (1); center fixture adapter (6) by means of four setscrews. Hold M1A1 gunner’s quadrant against mounting surface (7) of fixture adapter (6), and establish a level position by shimming the fixture adapter (6). Place precision level (2) on surface (8), which is parallel to fixture adapter (6) keyway, and check that keyway is level. If necessary, shim fixture adapter (6) to obtain a level position. Repeat steps 6 and 7 until both surfaces are level. 9 Secure fixture adapter (6) with six mounting screws (9).