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 174 of 590

TM 9-1240-401-34&P

4-24. M145/M145A1 TELESCOPE MOUNT FINAL INSPECTION AND ADJUSTMENT

- continued

m. CHECKING PITCH KNOB RUNNING TORQUE

With torque wrench (Item 36, appx F) and adapter

(8599912) (Item 5, appx F), rotate pitch knob (1)

one turn clockwise and one turn counterclockwise.

Measure the torque required to turn pitch knob (1).

The torque must be between 5 and 16 pound-

inches (0.56 and 1.80 N-m). If not, repair accord-

ing to repair procedure (ref. para 4-19).

n. CORRECTION COUNTER INSPECTION

2

3

4

5

6

7

8

1

Place M1A1 gunner's quadrant (1) in position on

quadrant support assembly (2).

Set correction counter (3) to +1 mil.

Set elevation counter (4) to 0.

Rotate fixture elevation handwheel (5) on the

cross-leveling fixture (6) until elevation level bubble

is centered.

Note reading on gunner’s quadrant (1).

The quadrant support assembly must elevate or

depress within 0.5 mil of the +1 mil entered into the

correction counter (3).

Repeat steps 2 thru 6 above for correction counter

(3) indications of -1 mil, ±12 mils, ±27 mils, and

±50 mils.

Check alinement of digits in correction counter (3)

and elevation counter (4) by placing the lowest digit

of each counter in coincidence with its respective

line. The alinement of the other counter digits must

not vary more than 1/16 inch (0.16mm). If the digit

alinement varies more than 1/16 inch (0.16mm),

repair according to repair procedure (ref. para

4-17).

4-60