Carbine 6850 Manuel de service Page 60

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TM 9-1005-319-23&P 0005
0005-16
M16 SERIES RIFLE/M4 SERIES CARBINE - Continued
Table 1. Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. FAILURE TO CYCLE WITH SELECTOR LEVER SET ON BURST (M16A2/M16A4 AND M4
ONLY).
Step 1. Inspect for broken automatic sear (33) or automatic sear spring (32).
Replace automatic sear (WP 0021).
Step 2. Inspect for faulty selector lever (14).
Replace selector lever (WP 0021).
Step 3. Inspect for broken tooth on burst cam (12).
Replace burst cam (WP 0021).
1 v s 0 2 4
M 1 6 A 2 / M 1 6 A 4 a n d M 4
3 2
3 3
1 2
1 4
Figure 22. Automatic Sear and Selector Lever Inspection.
Step 4. Inspect for broken burst cam spring (11). Burst cam spring should be bent and properly
formed without any sharp edges or corners.
Inspect and replace burst cam spring if required (WP 0023).
Step 5. Determine if bend in burst cam spring (11) is installed backwards (toward outside).
Install burst cam spring properly with bend to inside (WP 0023).
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