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 d. COUNTER ASSEMBLY FINAL ADJUSTMENT NOTE M15 quadrant must be mounted on cross- leveling fixture and test fixture adapter and cross-leveling fixture must be at zero elevation and cross-level. 1 2 3 4 5 6 7 Turn elevation knob until bubble in elevation fire control level (1) is centered. Turn cross-level knob until bubble in cross-level fire control level (2) is centered. Read elevation and correction counters. If numbers other than zero appear, block teeth of spur gearshaft (3). Loosen three clamp screws on hub of correction counter spur gear (4). Hold hub with a small drill shank inserted in one of three holes between screws, and turn spur gearshaft (3) until elevation counter registers 0000 mils. Hold spur gearshaft (3) stationary and turn hub of correction counter spur gear (4) until correction counter registers 00 mils. Tighten hub screws. 5.1-66 Change 1