TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 5.1-24. M15 QUADRANT FINAL INSPECTION AND ADJUSTMENT - continued a. SETTING UP AND ADJUSTING CROSS-LEVELING FIXTURE - continued 10 11 12 13 14 15 Remove centering plug (11) from round block (8). Using known good gunner’s quadrant and 6-inch parallel bar positioned across the top of two straight keys (12), ensure that keys are parallel with flat surface of round block (8). Recheck square portion of elevation shaft (3) to ensure that shaft is still level in elevation and cross- level positions. If not, repeat step 8. Using known good gunner’s quadrant and 6-inch parallel bar, position parallel bar and gunner’s quadrant on the face of round block (8) perpendicular to flat surface of round block (8), and adjust two cap screws (7) at 12 o’clock position and two cap screws (7) at 6 o’clock position until bubble on gunner's quadrant is centered. Rotate upper section handwheel (elevation) (9) to position flat surface of round block (8) from horizontal to perpendicular position as measured with a known good gunner’s quadrant and a 6-inch parallel bar on flat surface of round block (8). Position 6-inch parallel bar against two keys (12). Using known good gunner's quadrant placed on parallel bar, adjust two cap screws (7) at the 6 o’clock position until bubble in gunner's quadrant is centered. Repeat steps 7 thru 12 until test fixture adapter (6) and square portion of elevation shaft (3) are in agreement. 5.1-62 Change 1