Section Il Troubleshooting Procedures Troubleshooting

a. The table lists the common malfunctions which you may find during the operation or maintenance of the weapon or its components. You should perform the tests/inspections and corrective actions in the order listed.

b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a malfunction is not listed or is not corrected by listed -corrective actions, notify unit maintenance.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. SLUGGISH

Dirty receiver

Clean and lubricate

OPERATION

Lack of lubricant

Lubricate

Carbon buildup in gas

Clean gas regulator,

system

piston and cylinder

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. FAILURE TO FEED

Insufficient lubrication

Lubricate as required

Defective ammunition Links

Remove defective ammunition, install new ammunition

Obstruction in receiver

Remove obstruction

Insufficient gas pressure Unlatched cover

Clean gas regulator, piston and cylinder

Latch cover

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. FAILURE TO FEED (Cont)

Long/Short rounds

Long/Short rounds

LINK BELT

Inverted link belt

LINK BELT

Inverted link belt

Damaged, weak, or worn operating parts.

Aline rounds in link belt.

Reinstall link belt with open end of link facing down.

Notify unit maintenance.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

3. DOUBLE FEED

Dirty ammunition or

Clean ammunition and/or

chamber.

chamber

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. FAILURE TO

Dirty ammunition

Clean ammunition

CHAMBER

Carbon build up in gas

Clean gas regulator, pis

system.

ton, and cylinder. If problems still exist, notify unit maintenance.

Carbon build up in

receiver

Damaged round

Remove round and re charge weapon

Damaged or weakened

Notify unit maintenance

helical compression

spring (driving)

HELICAL COMPRESSION SPRING (DRIVING)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. FAILURE TO

Dirty chamber

Clean chamber.

CHAMBER

(Cont)

Damaged gas regulator

Notify unit maintenance

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

5. FAILURE TO FIRE

Safety on

Push SAFETY to left RED BAND visible).

TROUBLESHOOTING TABLE (Cont)
M249 Buttstock And Buffer Assembly

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

5. FAILURE TO FIRE (Cont)

COMPR (D

Broken or damaged firing pin

Broken or weakened helical compression spring

(driving) IEL'CAL

ESSION SPRING RIVING)

Notify unit maintenance. Notify unit maintenance

El

TROUBLESHOOTING TABLE (Cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

6

. FAILURE TO EXTRACT

Inspect for stuck cartridge case.

Follow instructions on page 2-28.

Dirty chamber/bolt and slide assembly

Clean chamber and/or Clean bolt and slide assembly. If problem still ex-istsnotify unit maintenance.

EXTRACTOR

Carbon buildup in gas system

Clean gas regulator, cylinder, and piston.

Damaged extractor/spring

Notify unit maintenance,

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

7 FAILURE TO EJECT

Short recoil

Clean and lubricate bolt and slide assembly. If problem still exists notify unit maintenance.

Damaged ejector/spring

Notify unit maintenance

EJECTOR

Carbon buildup in gas system

Clean gas regulator, piston, and cylinder

MALFUNCTION

8 STOP FIRING

BOLT MECHANISM

TEST OR INSPECTION

CORRECTIVE ACTION

Eject round. If this occurs more than once, it may be caused by faulty ammunition or a worn firing pin. Notify unit maintenance.

Defective round in Chamber

-UJJJJJ.

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