TM-9-1240-400-34-P

TELESCOPE; PANORAMIC: M115, ELBOW: M139, MOUNT: M138 AND M137

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1993

TM-9-1240-400-34-P - Page 222 of 344

TM 9-1240-400-34&P

5-19.

FINAL INSPECTION INSTRUCTIONS (CONT).

CHECKING M137 TELESCOPE MOUNT CANT CORRECTION

1

Set 500 mils into gunner’s quadrant (1) and place on level bar (2).

2

Rotate handwheel (3) for 500 mil depression.

3

Set 177.8 mils into gunner’s quadrant (1) and place on top surface of cross-leveling fixture (4).

4

Rotate lower handwheel (5), to the right, to 177.8 mil cant angle.

5

Rotate elevation knob (6) and center bubble in cross-level vial (7).

6

Correction counter (8) should read 96.1 ± 0.5 mils.

7

Repeat steps 4 thru 7, checking cant to the left.

8

Repeat steps 4 thru 8 for 800 and 1000 mil elevation.

Connection should be 180.5 + 1.0 mils and 271.9 ± 2.0 mils

respectively.

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