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 303 of 590

TM9-1240-401-34&P

18

Check bubble of fire control level (14); if not

centered, loosen ring (12) and readjust eccentric

bushing (13) to center bubble of fire control level

(14)

19

Rotate elevation handwheel (2) of M15 quadrant to

turn elevation counter (15) to 0.

20

Rotate upper handwheel (16) of cross-leveling

fixture counterclockwise until bubble of fire control

level (3) centers.

21

If bubble of fire control level (14) does not center,

turn cross-level knob (11) until bubble centers in fire

control level (14).

22

Repeat steps 16 thru 19 until bubble in fire control

level (14) is approximately centered. Seal ring (12)

using adhesive (item 1.1, appx B).

23

Return cross-leveling fixture to level position.

24

Remove cross-level knob (11) from M15 quadrant.

25

Install cover assembly, knob assembly, cross-level

knob, and associated parts (ref. para 5.1-14).

Change 1

5.1-69