ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
3-7. TEST AND ADJUSTMENT PROCEDURES (cont).
BACKLASH IN ORIENTING WORM
1
Put a reference line (1) on worm housing at center line of left orienting knob (2).
Aline one of center ribs (3) on orienting knob with reference line marked on center rib.
2
3
While looking through elbow telescope eyepiece (4), rotate azimuth knob (5) to superimpose
aiming circle vertical reticle line on test target vertical line.
4
Rotate left orienting knob (2) two full turns clockwise.
5
Rotate left orienting knob (2) counterclockwise two full turns to aline marked center rib (3)
without overtravel.
6
Sight through elbow telescope eyepiece (4). Error between aiming circle vertical reticle and test
target vertical line should not exceed 0.6 roil. If tolerance is exceeded, proceed to step 7. If
tolerance is met, proceed to elevation stop mechanism procedures, page 3-44.
7
Remove aiming circle from tripod.
