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 267 of 590

TM 9-1240-401-34&P

6

Place zeroed gunner’s quadrant (7), with end-for-

end correction applied, on quadrant seats (8) of M15

quadrant.

7

Center bubble on gunner’s quadrant.

8

Recheck to be sure that bubble of fire control level

(3) is in agreement with bubble in gunner’s quadrant

(7).

9

If fire control level (3) does not agree with gunners

quadrant (7), loosen ring (9) and readjust eccentric

bushing (10) until fire control level (3) and gunner’s

quadrant (7) agree.

10

Tighten ring (9) and seal with adhesive (item 1.1,

appx B).

11

Using suitable clamp, secure 6-inch parallel bar on

surface A perpendicular to bar (gunner’s quadrant

seat).

12

Place zeroed gunner’s quadrant (7), with end-for-

end correction applied, on parallel bar.

13

Turn cross-level knob (11) until bubble of gunner’s

quadrant (7) is centered.

14

Using fabricated eccentric tool (fig. C-2, appx C),

loosen ring (12) and adjust eccentric bushing (13)

until bubble in fire control level (14) centers.

15

Tighten ring (12) and seal with adhesive (item 1.1,

appx B).

16

Remove 6-inch parallel bar and cross-level knob

(11).

Change 1

5.1-33