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 35 of 192
ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Check for worn or damaged worm shaft. Refer to page 3-12.
Check for improperly seated ball socket seat.
Reseat ball socket seat. Refer to page 3-12.
Check for setscrews that are set to tight against worm shaft cap or ball socket
seat.
Adjust setscrews against worm shaft cap or ball socket seat. Refer
to page 3-12.
Check for loose pin in adapter.
Reposition pin in adapter. Refer to page 3-12.
Recheck for backlash.
If backlash is still present, notify general support maintenance.
5. BACKLASH PRESENT IN AZIMUTH MECHANISM.
Step 1. Check for loose worm shaft cap.
Adjust worm shaft cap. Refer to page 3-12.
Step 2. Check for broken spring.
Replace spring. Refer to page 3-12.
Step 3. Check worm shaft ball for out-of-roundness.
If worm shaft ball is out of round, replace worm shaft. Refer to page
3-12.
Step 4. Check for worn or damaged worm shaft. Refer to page 3-12.
Step 5. Check for improperly seated ball socket. Refer to page 3-12.
3-7
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