Mk-19 Firing Operation

Before performing any procedure, ensure the weapon is clear of any ammunition.

1. Observe the WARNING above. Charge the weapon and press the trigger to release the bolt forward under spring tension.

2. Check the firing pin (1) tip. It should be protruding. If not, evacuate to Direct Support Maintenance. (Marine Corps: repair at Unit Maintenance.)

3. Check the tip of the firing pin for pits or damage.

Mark Machine Gun

Tools and Special Tools - Continued

Tool set, organizational maintenance, SL-3-08668A (Marine Corps only)

Reference

TI-09761A-35/1

SYMPTOM - Continued

Rounds will not fire.

FIRING PIN DID NOT SPRING FORWARD

Test the firing pin operation again. Verify the firing pin springs forward. If not, evacuate to Direct Support Maintenance. (Marine Corps: repair at Unit Maintenance.)

FIRING PIN TIP PITTED

Evacuate to Direct Support Maintenance. (Marine Corps: repair at Unit Maintenance.)

MALFUNCTION

Bent, broken, or missing guide rod spring. CORRECTIVE ACTION

With feed slide assembly assembled, check presence and condition of guide rod spring (1).

Ugws Solenoid

DAMAGED GUIDE ROD SPRING

Evacuate to Direct Support Maintenance.

MALFUNCTION

Firing solenoid is defective (UGWS ONLY). CORRECTIVE ACTION

Replace solenoid.

Mk19 Firing Solenoid

END OF WORK PACKAGE

UNIT

MK 19 MOD 3 40 MM MACHINE GUN (NSN 1010-01-126-9063) UPGUNNED WEAPONS STATION MK 19 40 MM MACHINE GUN (NSN 1010-01-362-6513)

UNIT TROUBLESHOOTING - ERRATIC FIRING

SC 4933-95-CL-A07 with addition of SL-3-00607A (Marine Corps only) Tool kit, small arms repairman,

SC-5180-95-CL-A07 Tool set, intermediate maintenance, SL-3-08669A (Marine Corps only) Tool set, organizational maintenance, SL-3-08668A (Marine Corps only)

SYMPTOM

Erratic firing.

MALFUNCTION

Loose or cracked right-hand (RH) and left-hand (LH) cam followers. CORRECTIVE ACTION

Manually test the RH and LH cam followers (1) for looseness and check for cracks on the top. If RH and LH cam followers are cracked or loose, evacuate to Direct Support Maintenance. (Marine Corps: tighten nylon point set screws (2) as required and perform other repair at Unit Maintenance.)

INITIAL SETUP:

Tools and Special Tools

Tool kit, small arms repairman,

Reference

WP 0041 00

Mark Alignment Guide

SYMPTOM - Continued

Erratic firing.

MALFUNCTION

Cracked or broken alignment guide flat spring.

CORRECTIVE ACTION

Remove the alignment guide assembly from the receiver (WP 0041 00). Check the alignment guide flat spring (1) for cracks around the flat head screw and for breakage.

Non Electrical Wire

Evacuate to Direct Support Maintenance.

MALFUNCTION

Non-electrical wire missing or broken on bolt sleeves.

CORRECTIVE ACTION

Remove the bolt and backplate assembly from the receiver (WP 0041 00). Check for the presence of non-electrical wire (1) on the bolt sleeves.

Bolt Missing Head Non Conformance

NON-ELECTRICAL WIRE MISSING/BROKEN

Evacuate to Direct Support Maintenance. (Marine Corps: repair at Unit Maintenance.)

MALFUNCTION

Broken lock plate.

CORRECTIVE ACTION

Evacuate to Direct Support Maintenance. (Marine Corps: repair at Unit Maintenance.)

MALFUNCTION

Broken or worn helical compression spring; missing or out of position sear buffer components. CORRECTIVE ACTION

Turn the bolt upside down or on its face. Manually attempt to move the bolt sear (1). The bolt sear should not move easily. If it does, evacuate to Direct Support Maintenance. (Marine Corps: repair at Unit Maintenance.)

Mark Machine Gun

END OF WORK PACKAGE

UNIT

MK 19 MOD 3 40 MM MACHINE GUN (NSN 1010-01-126-9063) UPGUNNED WEAPONS STATION MK 19 40 MM MACHINE GUN (NSN 1010-01-362-6513)

UNIT TROUBLESHOOTING - SLUGGISH FIRING

INITIAL SETUP:

Tools and Special Tools

Tool kit, small arms repairman,

SC 4933-95-CL-A07 with addition of SL-3-00607A (Marine Corps only) Tool kit, small arms repairman,

SC-5180-95-CL-A07 Tool set, intermediate maintenance, SL-3-08669A (Marine Corps only) Tool set, organizational maintenance, SL-3-08668A (Marine Corps only)

Materials/Parts

Abrasive cloth (item 3, WP 0124 00) Lubricant (as required)

Reference

WP 0041 00

SYMPTOM

Sluggish firing.

MALFUNCTION

Carbon buildup or chrome erosion on bore and chamber.

CORRECTIVE ACTION

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