TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM9-1240-401-34&P 18 Check bubble of fire control level (14); if not centered, loosen ring (12) and readjust eccentric bushing (13) to center bubble of fire control level (14) 19 Rotate elevation handwheel (2) of M15 quadrant to turn elevation counter (15) to 0. 20 Rotate upper handwheel (16) of cross-leveling fixture counterclockwise until bubble of fire control level (3) centers. 21 If bubble of fire control level (14) does not center, turn cross-level knob (11) until bubble centers in fire control level (14). 22 Repeat steps 16 thru 19 until bubble in fire control level (14) is approximately centered. Seal ring (12) using adhesive (item 1.1, appx B). 23 Return cross-leveling fixture to level position. 24 Remove cross-level knob (11) from M15 quadrant. 25 Install cover assembly, knob assembly, cross-level knob, and associated parts (ref. para 5.1-14). Change 1 5.1-69