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).

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