TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 4-24. M145/M145A1 TELESCOPE MOUNT FINAL INSPECTION AND ADJUSTMENT - continued m. CHECKING PITCH KNOB RUNNING TORQUE With torque wrench (Item 36, appx F) and adapter (8599912) (Item 5, appx F), rotate pitch knob (1) one turn clockwise and one turn counterclockwise. Measure the torque required to turn pitch knob (1). The torque must be between 5 and 16 pound- inches (0.56 and 1.80 N-m). If not, repair accord- ing to repair procedure (ref. para 4-19). n. CORRECTION COUNTER INSPECTION 2 3 4 5 6 7 8 1 Place M1A1 gunner's quadrant (1) in position on quadrant support assembly (2). Set correction counter (3) to +1 mil. Set elevation counter (4) to 0. Rotate fixture elevation handwheel (5) on the cross-leveling fixture (6) until elevation level bubble is centered. Note reading on gunner’s quadrant (1). The quadrant support assembly must elevate or depress within 0.5 mil of the +1 mil entered into the correction counter (3). Repeat steps 2 thru 6 above for correction counter (3) indications of -1 mil, ±12 mils, ±27 mils, and ±50 mils. Check alinement of digits in correction counter (3) and elevation counter (4) by placing the lowest digit of each counter in coincidence with its respective line. The alinement of the other counter digits must not vary more than 1/16 inch (0.16mm). If the digit alinement varies more than 1/16 inch (0.16mm), repair according to repair procedure (ref. para 4-17). 4-60