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 302 of 590

5. 1-24. M15

TM 9-1240-401-34&P

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Place zeroed M1A1 gunner's quadrant (7) on

quadrant seats (8) of M15 quadrant.

Center bubble on gunner’s quadrant (7) by turning

elevation handwheel (2).

Recheck to ensure that bubble of fire control level

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

(7).

If fire control level (3) does not agree with gunner’s

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

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

quadrant (7) agree.

Tighten ring (9). Seal ring (9) using adhesive (item

1.1, appx B).

Using suitable clamp, secure 6-inch parallel bar on

surface A perpendicular to bar (gunner’s quadrant

seat).

Place zeroed M1A1 gunner’s quadrant (7) on

parallel bar.

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

quadrant (7) is centered.

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.

Tighten ring (12).

Turn elevation handwheel (2) of M15 quadrant until

reading of 1383 is set into elevation counter (15).

Rotate upper handwheel (16) of cross-leveling

fixture clockwise until bubble of fire control level (3)

centers.

5.1-68

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