TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 3-7 FIRE CONTROL ALINEMENT TESTS AND MEASUREMENTS — CONTINUED 3-7.9 Testing and Scribing the M145/M145A1 Telescope Mount 1 Level the gun trunnions (para 3-7.3). 2 Zero the cannon tube using tested M1A1 gunner’s quadrant (para 3-7.5). 3 Center cross-level (1) bubble of the M145/M145A1 telescope mount (2) by turning cross-level mechanism knob (3). 4 Center pitch level (4) bubble by turning the pitch level knob (5). 5 Scribe one line from pitch level knob (5) to bracket (6). 6 Scribe another line across from bracket (7) to rocker (8). 7 Aline scribe lines on cross-level mechanism knob (3) and cross-level mechanism (9) by loosening two screws on cross-level mechanism knob and slipping indicator (10) to scribe line on cross-level mechanism, retighten two screws on cross-level mechanism knob. (a) Remove M117/M117A2 panoramic telescope (11). (b) Scribe line from cross-level mechanism (9) to body (12) and install M117/M117A2 panoramic telescope (11). 3-106