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TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download

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TM 9-1240-400-34&P 5-19. FINAL INSPECTION INSTRUCTIONS (CONT) CHECKING AND ADJUSTING ELEVATION KNOB TORQUE AND BACKLASH (CONT) 4 Place gunner’s quadrant (4), on parallel bar (5) with end-for-end correction applied, on upper assembly (6). Rotate gunner’s quadrant knob (7) to center bubble of level vial (8). Record reading of gunner’s quadrant (4). 5 Continue rotation of elevation knob (1) in the same direction for at least one-half turn, reverse direction and continue back to the intersection of the two scribed lines (9) with no over-travel. Check to see if bubble of level vial (8) of gunner’s quadrant (4) is centered. If not, rotate gunner’s quadrant knob (7) of gunner’s quadrant (4) to center bubble of level vial (8). Backlash shall not exceed 0.5 mil as read from gunner’s quadrant (4). 6 Adjust elevation machine thread plug (10) using a screwdriver. Check the torque or backlash and if still excessive, proceed to step 7. 5-60