2-6. MALFUNCTIONS, STOPPAGES, AND CORRECTIONS
A malfunction is a failure of the weapon to function properly. Neither defective ammunition nor improper operation of the gun by a crewmember is considered a malfunction of the MK 19. A stoppage is any interruption in the cycle of operation caused by faulty action of the weapon or ammunition. Appendix C, Stoppages, Malfunctions, Immediate Actions, and Remedial Actions, provides inspections, corrective actions, and emergency actions of malfunctions and stoppages. For more information on troubleshooting common malfunctions and stoppages, refer to TM 9-1010-230-10.
The MK 19 requires preventive maintenance checks and services (PMCS) and lubrication before, during, and after firing. It should be checked and cleaned daily when used and not fired, and weekly if not used. For more detailed guidance on the care, cleaning, and PMCS for the MK 19, refer to TM 9-1010-230-10.
a. Cleaning and Lubrication. Several types of lubricants can be used on the MK19. High friction areas of the gun have a protective coating and care must be taken to prevent its removal. Listed below are authorized lubricants, and other information about lubricating and cleaning the MK19.
(1) Authorized Lubricants. These are the authorized lubricants used on the MK 19:
(a) Lubricant, artic weather, automatic weapons (LAW).
(b) Lubricating oil, semifluid, automatic weapons (LSA).
(c) Lubricating oil, semifluid, automatic weapons, temperate (LSAT).
(d) Rifle bore cleaner (RBC). RBC should be used sparingly only in the bore and when necessary.
(e) Grease, molybdenum disulfide (GMD).
(2) Use of Lubrications. The following is general guidance on the use of lubricants on the MK 19.
(a) Never mix lubricants on the MK19. If you change lubricants or do not know for sure which lubricant is currently applied to the MK19, completely clean off all old materials before you apply a new lubricant.
(b) Never use cleaner lubricant petroleum (CLP) on a MK19. It gums up moving parts instead of lubricating them.
(c) Apply a heavy coat of lubricant and do not wipe it off.
(d) In cold weather, 0 degrees F to -25 degrees F, use LSAT, GMD, or LAW.
(e) In extra cold weather, -25 degrees F and below, use LAW.
(3) High Friction Areas. The under side of the primary drive lever, the vertical cam assembly, the bolt (where it rides on the rails), and the area where the feed slide and feed slide tray connect have been treated to prolong the life of the MK 19. Special care is required during cleaning and maintenance to prevent damage to the coating. CLP, acids, and abrasives should never be used on the MK 19 because they will remove the protective coating.
b. General Cleaning and Lubrication Instructions. The following is general guidance for the cleaning of the MK 19.
(1) Wipe or brush off dirt and grime.
(3) Lubricate each part. Give special care to those hard-to-get spots.
(4) Work in the lubricant by moving the parts.
c. When to Clean, Lubricate and Inspect the MK 19. Clean and inspect the gun thoroughly. Report all worn, burred, defective, or missing parts to your armorer or support maintenance. In general, lubricate and clean the MK19 as follows:
(1) Always clean and lubricate the gun after firing.
(2) Clean and lubricate the gun daily if it is used but not fired.
(3) Clean and lubricate the gun weekly if the weapon is stored.
d. Inspections. Several parts of the MK 19 should be checked whenever possible. These include:
(1) The vertical cam. Check closely for smoothness.
(2) The gap between the charger assemblies and the receiver.
(3) All parts for wear, cracks, missing items, and abnormal shapes.
The MK 19 is a robust weapon and designed to operate over a wide range of weather conditions but additional care is required when the temperatures are hot or cold, and the conditions are wet, sandy, or icy.
a. During hot, wet, or salty air conditions follow these procedures:
(1) Inspect the weapon more frequently for signs of rust.
(2) Keep gun as moisture-free as possible.
(3) Field strip, clean, and lubricate more often to preserve metal and prevent rust.
(4) Use a generous second coat of lubrication for extra protection.
b. During hot, dry, sandy, or dusty conditions follow these procedures:
(1) Do not lubricate the entire exposed metal surfaces as this will only collect dust and sand.
(2) Clean the weapon thoroughly and lubricate only the moving components.
(3) Extreme heat dries up lubricant. Clean and lightly lubricate the moving components of the weapon more frequently.
c. During cold, icy, or snowy conditions follow these procedures:
(1) Prior to using cold-weather lubricant, be sure to clean off all existing lubrication. From 0 degrees F to -25 degrees F, use either LSAT, GMD, or LAW. At temperatures -25 degrees F and below, use LAW.
(2) If the weapon 'sweats,' dry and lube the parts before taking the weapon outdoors and apply a light second coat to provide protection.
(3) Cover weapon if left outside.
(4) If possible, thoroughly clean, dry, and lubricate the weapon in a warm place.
(5) If the weapon is brought indoors, keep it away from direct heat.
(6) Perform functional checks and lubricate daily to help prevent corrosion.
Only the commander can direct the destruction of the MK 19. There are several ways to destroy it. Methods include destruction by mechanical means, burning, gunfire, demolition or disposal. Use the same methods to destroy equipment. However, ammunition must be handled differently. The best way to destroy ammunition is to fire it. Otherwise, dispose of it by burial, dumping it in a body of water, or using the demolition method.
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