TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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4-54 TM 9-1240-401-34&P 4-24. M145/M145A1 TELESCOPE MOUNT FINAL INSPECTION AND ADJUSTMENT - continued e. CROSS-LEVEL ADJUSTMENT 1 Install M117/M117A2 panoramic telescope (1) in M145/M145A1 telescope mount (ref. TM 9-2350-11-10 or TM 9-2350-314-10). 2 3 4 5 6 7 8 9 10 11 With cross-leveling fixture (3) leveled in elevation and cross-level, aline reticle of M117/M117A2 panoramic telescope (1) with plumbline. Elevate and depress cross-leveling fixture (3), as required, between -50 mils and 1333 mils while tracking plumb line. Adjust cross-level knob (4) and repeat steps 2 and 3 until M117/M117A2 panoramic telescope (1) tracks plumb line throughout complete excursion within 0.5 mil. Engage fabricated eccentric tool (fig. C-2, appx C) to threaded ring (5). Insert a common straight blade screwdriver through center hole in fabricated eccentric tool and engage cell (6). Adjust cell (6) until cross-level (7) bubble is cen- tered within graduations on the cross-level (7). Hold cell (6) firmly in place while turning fabricated eccentric tool (fig. C-2, appx C) to tighten threaded ring (5). Be careful not to disturb setting of cross-level (7). Loosen two screws (8). Rotate indicator (9) to aline scribe marks. Tighten two screws (8).