TM-9-1290-262-24-P
AIMING CIRCLE, M2A2, W/E
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT,AND GENERAL SUPPORT MAINTENANCE MANUAL
SEPTEMBER 1994
TM-9-1290-262-24-P - Page 67 of 192
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,
page 3-37, and recheck torque.
5 Fill setscrew holes with sealing compound
(item 8, appx D).
BACKLASH IN AZIMUTH WORM
1
2
3
4
5
While looking through elbow telescope
eyepiece (1), rotate azimub knob (2) to
superimpose aiming circle vertical reticle
line on test target vertical line.
Record reading of azimuth micrometer
scale (3).
Rotate azimuth knob two full turns clock-
wise.
Rotate azimuth knob counterclockwise to
recorded reading without overtravel.
Sight through elbow telescope. Error be-
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.
ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
3-39
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