TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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5. 1-24. M15 TM 9-1240-401-34&P 6 7 8 9 10 11 12 13 14 15 16 17 Place zeroed M1A1 gunner's quadrant (7) on quadrant seats (8) of M15 quadrant. Center bubble on gunner’s quadrant (7) by turning elevation handwheel (2). Recheck to ensure that bubble of fire control level (3) is in agreement with bubble in gunner's quadrant (7). If fire control level (3) does not agree with gunner’s quadrant (7), loosen ring (9) and readjust eccentric bushing (10) until fire control level (3) and gunner’s quadrant (7) agree. Tighten ring (9). Seal ring (9) using adhesive (item 1.1, appx B). Using suitable clamp, secure 6-inch parallel bar on surface A perpendicular to bar (gunner’s quadrant seat). Place zeroed M1A1 gunner’s quadrant (7) on parallel bar. Turn cross-level knob (11) until bubble of gunner’s quadrant (7) is centered. Using fabricated eccentric tool (fig. C-2, appx C) loosen ring (12) and adjust eccentric bushing (13) until bubble in fire control level (14) centers. Tighten ring (12). Turn elevation handwheel (2) of M15 quadrant until reading of 1383 is set into elevation counter (15). Rotate upper handwheel (16) of cross-leveling fixture clockwise until bubble of fire control level (3) centers. 5.1-68 Change 1