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 305 of 590
TM9-1240-401-34&P
11
Turn handwheel assembly (1) counterclockwise to stop; reading on elevation counter (8) must indicate at least 9772
(228 mils depression).
12
Rotate handwheel assembly (1) clockwise to obtain a reading of 9800 on elevation counter (8).
13
Rotate upper section handwheel (elevation) (9) on cross-leveling fixture counterclockwise until bubble of fire control level
(10) centers.
14
Using known good gunners quadrant (6) check elevation accuracy by placing a reading of 200 mils on M15 quadrant.
15
Place gunner’s quadrant (6) on quadrant seats of bar. Bubble should center within plus or minus 0.5 mil.
16
Rotate handwheel assembly (1) one complete revolution in each direction. Bubble of fire control level (10) must center
in each direction within 1/2 graduation (0.5 mil).
17
Repeat steps 14 thru 16 for 400,600,800,1000, and 1200 mils elevation,
18
Perform elevation excursion by rotating handwheel assembly (1) clockwise to stop. A minimum of 1383 mils must be
obtained on elevation counter (8).
Change1
5.1-71
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