TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 4-14. DISK ASSEMBLY MAINTENANCE INSTRUCTIONS - continued I c. Assembly - continued 14 Install cover (5) between bosses and slide level (3) into disk assembly (4). 15 Using fabricated eccentric tool, install cell (2) and threaded ring (1). Do not tighten pending final ad- justment. 2 3 4 5 6 7 8 9 1 Install perpendicularity gage (33) on M145/M145A1 telescope mount (34) or use two parallel bars across body of mount if perpendicularity gage is not available. Level the cross-leveling fixture in elevation and cross-level. Set the zeroed M1A1 gunner’s quadrant (35) on the perpendicularity gage (33). Adjust pitch knob (36) until M1A1 gunner’s quad- rant level (37) bubble is centered. Adjust elevation handwheel (36) until elevation counter (39) reads zero. Engage fabricated eccentric tool to the threaded ring (1). Insert a common straight blade screwdriver through the center hole in fabricated eccentric tool and engage cell (2). Adjust cell (2) until the level (3) bubble is centered within the graduations on level (3). Hold cell (2) firmly in place while turning fabricated eccentric tool to tighten threaded ring (1). Be care- ful not to disturb the setting of level (3). I d. Adjustment I 4-20