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 163 of 590

TM 9-1240-401-34&P

4-49

a. SETTING UP AND ADJUSTING THE CROSS-LEVELING FIXTURE

1 Secure cross-leveling fixture (1) on a solid stand

bolted to the floor.

2 Place precision level (2) on square shaft (3), per-

pendicular to axis of rotation, and center bubble.

3 Place precision level (2) on square shaft (3), paral-

4

5

6

7

8

Iel to axis of rotation, and center bubble.

Set cant vernier scale (4) and elevation vernier

scale (5) to "0".

Mount fixture adapter (6) on cross-leveling fixture

(1); center fixture adapter (6) by means of four

setscrews.

Hold M1A1 gunner’s quadrant against mounting

surface (7) of fixture adapter (6), and establish a

level position by shimming the fixture adapter (6).

Place precision level (2) on surface (8), which is

parallel to fixture adapter (6) keyway, and check

that keyway is level. If necessary, shim fixture

adapter (6) to obtain a level position.

Repeat steps 6 and 7 until both surfaces are level.

9 Secure fixture adapter (6) with six mounting screws

(9).