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 301 of 590

TM 9-1240-401-34&P

1

2

Install M15 quadrant on cross-leveling fixture (ref.

Section a, para 5.1-24). Perform steps 7 thru 9 of

fixture setup procedure (ref. Section a, para 5.1-24).

Turn spur gear (1) until correction counters register

00 mils. Turn elevation handwheel (2) until elevation

counter registers 0000 mils.

3

4

5

Adjust elevation handwheel (2) to center bubble of

fire control level (3).

Loosen three screws (4) to disengage differential

spur gear (5) from spur gear (6).

Rotate differential spur gear (5) to zero counter, then

tighten three screws (4).

Change 1

5.1-67