TM-9-1240-401-34-P

TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1993

TM-9-1240-401-34-P - Page 298 of 590

TM 9-1240-401-34&P

5.1-24. M15 QUADRANT FINAL INSPECTION AND ADJUSTMENT - continued

c.

BAR (GUNNER’S QUADRANT SEAT) FINAL ADJUSTMENT

1

2

3

4

5

6

Ensure that bar (1) is installed on M15 quadrant with

one straight pin (2).

Ensure that spring (3) and screw (4) have been

installed.

Place known good gunner’s quadrant on machined

quadrant seats of bar (1) and adjust screw (4) until

bubble of gunner’s quadrant is centered.

Using feeler gage between housing and bar (1),

determine the number of shims (item 19, appx B)

necessary to hold bar in place for drilling and

reaming for straight pin (2).

Install shims as necessary between bar (1) and

housing and tighten screw (4) to secure bar (1) for

drilling.

Remove M15 quadrant from cross-leveling fixture.

5.1-64

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