TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

  TM-9-2350-311-10 - Page 510 of 775

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


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