ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
Table 3-1. DIRECT SUPPORT TROUBLESHOOTING (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
M2A2 AIMING CIRCLE (CONT)
Step 6. Check for setscrews that are set too tight against worm shaft cap or ball socket
seat.
Adjust setscrews against worm shaft cap or socket seat. Refer to
Step 7. Check for loose pin in adapter.
Step 8. Recheck for backlash.
If backlash is still present, notify generaI support maintenance.
16. BACKLASH PRESENT IN ORIENTING MECHANISM.
Step 1. Check for loose worm shaft cap.
Step 2. Check for broken spring.
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.
Replace worn or damaged worm shaft. Refer to page 3-12.
Step 5. Check for improperly seated ball socket seat.