TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 4-6. INITIAL INSPECTION Item No. 2 3 4 5,6 7, 8 9 Item To Be Inspected 1 M145/145A1 TELESCOPE MOUNT MOUNTING SURFACES DECAL AND lDENTl- CATION PLATE CROSS-LEVEL MECHANISN KNOB PITCH LEVEL AND CROSS-LEVEL LEDS ELEVATION COUNTER Procedures Inspect M145/M145A1 telescope mount (1) for good overall appearance with all parts securely tightened in place. Inspect mounting surfaces (2) for burrs and corrosion; must be free of burrs and corrosion. Inspect decal and identification plate (3) for legibility; must be legible and clearly defined. Rotate cross-level mechanism knob (4). Cross-level mecha- nism knob must turn smoothly with 3 to 6 pound-inches (0.339 to 0.678 N–m) running torque. Backlash must not exceed 1.0 mil at 0 setting. Rotation of cross-level mechanism knob must move telescope socket 10° to right and 10° to left without binding. Check that pitch level (5) bubble and cross-level (6) bubble are centered within one graduation for each vial. Check LEDS (7 and 8) to ensure light is sufficient to clearly define marking on level vials. Operate mount through 1383 mils elevation and minus 50 roils depression. The elevation counter (9) must be accurate within 0.5 mil as read on gunner’s quadrant. 4-4