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)
18. AZIMUTH MECHANISM BINDS.
Step 1. Check for backlash.
Adjust azimuth mechanism. Refer to page 3-12.
Step 2. Check for bent worm shaft.
Replace worm shaft. 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.
Replace worm shaft. Refer to page 3-12.
Step 5. Recheck for binding.
If binding is still present, notify general support maintenance.
9. COMPASS NEEDLE FAILS TO TURN FREELY WHEN UNLOCKED.
Turn compass needle to UNLOCKED and check compass needle action.
If compass needle does not pivot freely, notify general support
maintenance.
