ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
CHECK OF ELEVATION WORM TORQUE
1 Install adapter (1) on elevation knob.
2 Install 0 to 80 in.-oz torque wrench (2) on
adapter.
3 Check for a running torque of 12.00 to
28.00 in.-oz (0.08 to 0.20 N-m).
4 If torque is out of tolerance, repeat steps 6
thru 17 of backlash in elevation worm test,
5 Fill setscrew holes with sealing compound
(item 8, appx D).
BACKLASH IN AZIMUTH WORM
While looking through elbow telescope
1
eyepiece (1), rotate azimub knob (2) to
superimpose aiming circle vertical reticle
line on test target vertical line.
Record reading of azimuth micrometer
2
scale (3).
Rotate azimuth knob two full turns clock-
3
wise.
Rotate azimuth knob counterclockwise to
4
recorded reading without overtravel.
Sight through elbow telescope. Error be-
5
tween aiming circle vertical reticle and test
target vertical line should not exceed 0.4
roil. If tolerance is exceeded, proceed to
steps 6 thru 9. If tolerance is met, pro-
ceed to orienting worm backlash adjust-
ment, page 3-42.
