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 231 of 590

5-57

TM 9-1240-401-34&P

j. LEVEL TRAVEL AND LIFT

1

2

3

4

5

6

7

8

9

10

11

Set azimuth fixture ring (1) to "0" coincidence on

azimuth testing fixture (2).

While sighting through M117/M117/A2 panoramic

telescope eyepiece (3), rotate azimuth knob (4)

and elevation knob (5), until M117/M117A2 pano-

ramic telescope reticle coincides with reticle of

collimating projector (6).

Rotate azimuth fixture ring (1) 800 roils counter-

clockwise

Rotate azimuth knob (4) clockwise until retitles

coincide.

Check that line of sight does not deviate from hori-

zontal by more than 6.0 mil.

Rotate azimuth knob (4) clockwise approximately

one-half revolution while observing reticle.

Rotate azimuth knob (4) slowly counterclockwise

until retitles coincide.

Check that line of sight changes no more than 0.5

mil from reading in step 5.

Repeat steps 3 thru 8 until azimuth fixture ring (1)

has made two full revolutions.

During level travel test, direction of cap rotation

shall be reversed. Any vertical displacement of line

of sight with respect to horizontal target line result-

ing from this reversing of travel shall not exceed

2.0 mil. This test shall be performed at minimum of

eight 800-mil azimuth settings.

If level travel exceeds tolerance specified, check

mounting surfaces of M117/M117A2 panoramic

telescope (7) and fixture adapter (8) for dirt and

burrs. If none of above conditions exist, return

M117/M117A2 panoramic telescope to depot main-

tenance.