ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49 A7-3-72/74
Table 3-1. DIRECT SUPPORT TROUBLESHOOTING (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
M2A2 AIMING CIRCLE (CONT)
12. AZIMUTH THROWOUT MECHANISM DOES NOT RETURN TO MESH WHEN RELEASED.
Step 1. Check for weakness in helical compression spring.
Replace defective helical compression spring. Refer to page 3-12.
Step 2. Check for binding in azimuth throwout mechanism.
Refer to malfunction 10 for azimuth throwout mechanism trouble-
shooting instructions.
13. ORIENTATION THROWOUT MECHANISM DOES NOT RETURN TO MESH WHEN RE-
LEASED.
Step 1. Check for weakness in helical compression spring.
Replace defective helical compression spring. Refer to page 3-12.
Step 2. Check for binding in orientation throwout mechanism.
Refer to malfunction 11 for orienting throwout mechanism trouble-
shooting instructions.
14. BACKLASH PRESENT IN ELEVATION MECHANISM.
Step 1. Check for loose worm shaft cap.
Adjust worm shaft cap. Refer to page 3-12.
Step 2. Check worm shaft ball for out-of-roundness.
If worm shaft ball is out of round, replace worm shaft. Refer to page
3-12.
