Note

175 Cannon

SYMPTOM - Continued

Bolt does not reach sear.

BENT VERTICAL CAM

Install new vertical cam assembly (WP 0059 00).

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. Tighten nylon point set screws (2) as required.

LOOSE RH OR LH CAM FOLLOWERS OR NYLON POINT SET SCREWS Tighten RH or LH cam followers (1). Tighten nylon point set screws (2).

If cracked, replace RH and or LH cam follower. Install new nylon point set screw (WP 0068 00).

END OF WORK PACKAGE

Mark Machine Gun
1LK020

CRACKS

DIRECT SUPPORT

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

DIRECT SUPPORT TROUBLESHOOTING - GUN WILL NOT SHOOT

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)

SYMPTOM

Gun will not shoot.

MALFUNCTION

Perform function check (WP 0039 00). Locate specific problem area and troubleshoot.

CORRECTIVE ACTION

Some malfunctions occur only during automatic operation. If the function check did not help to locate the problem area, perform the following symptom malfunctions in sequence until the problem is identified.

1. Rounds will not feed (WP 0026 00).

2. Rounds will not extract/eject (WP 0027 00).

3. Rounds will not fire (WP 0028 00).

4. Bolt jams during charging or firing (WP 0022 00).

END OF WORK PACKAGE

References

WP 0022 00 WP 0026 00 WP 0027 00 WP 0028 00 WP 0039 00

DIRECT SUPPORT

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

DIRECT SUPPORT TROUBLESHOOTING - ROUNDS WILL NOT FEED

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

Lubricant (as required)

SYMPTOM

Rounds will not feed.

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