Malfunctions Stoppages Immediate Action Remedial Action Maintenance and Destruction

MALFUNCTIONS

A malfunctioning machinegun is a gun that is not firing properly. Defective ammunition or improper operation by the gunner is not a malfunction. Two of the more common malfunctions of the M60 machinegun are sluggish operation and uncontrolled fire (runaway gun). The table on the next page shows malfunctions, their probable causes, and corrective actions.

SLUGGISH OPERATION.

Sluggish operation of the M60 usually is due to excessive friction caused by carbon, lack of proper lubrication, burred parts, or excessive loss of gas due to a loose or missing gas-port plug. Corrective action includes cleaning, lubricating, inspecting, and replacing parts as necessary.

UNCONTROLLED FIRE (RUNAWAY GUN).

Uncontrolled fire (the gun continues to fire after the trigger is released) is usually caused by the gunner not pulling and holding the trigger all the way to the rear. This results in the sear not clearing the sear notch, which causes wear to both parts. The following are immediate actions for uncontrolled fire:

9 The gunner holds the gun on target and fires the remaining ammunition.

• The assistant gunner stops the gun from firing by breaking the belt (twist quickly in either direction),

• When the gun has stopped firing, the gunner checks it to find the cause of the malfunction.

Clearing Gun Malfunctions
5-1

MALFUNCTIONS

MALFUNCTION

PROBABLE CAUSE

CORRECTIVE ACTION

SLUGGISH OPERATION.

CARBON IN GAS PORT.

CLEAN GAS PORT.

LOSS OF GAS.

TIGHTEN OR REPLACE GAS-PORT PLUG.

UNCONTROLLED FIRE (RUNAWAY GUN).

WORN OR BROKEN SEAR.

SEND TO DIRECT SUPPORT MAINTENANCE.

WORN OR BROKEN SEAR NOTCH.

SEND OPERATING ROD TO DIRECT SUPPORT MAINTENANCE.

SEAR INSTALLED BACKWARDS.

INSTALL CORRECTLY.

BOLT AND OPERAT-ING-ROD GROUP IMPROPERLY JOINED.

INSTALL CORRECTLY. NOTE: IT IS

IMPORTANT THAT THE OPERATING-ROD YOKE BE INSTALLED BETWEEN THE TWO FIRING-PIN SPOOLS.

CARBON BUILDUP IN GAS PORT.

CLEAN GAS PORT.

STOPPAGES

A stoppage is any interruption in the cycle of functioning caused by faulty action of the gun or faulty ammunition. Stoppages are classified by their relationship to the cycle of functioning. The following table shows types of interruptions or stoppages and their probable causes and corrective actions.

STOPPAGES

STOPPAGES

PROBABLE CAUSE

CORRECTIVE ACTION

FAILURE TO FEED.

INSUFFICIENT GAS PRESSURE.

CLEAN GAS PORT.

IMPROPER LUBRICATION.

LUBRICATE AS REQUIRED.

DEFECTIVE LINKS OR AMMUNITION.

INSERT NEW LINK OR AMMUNITION.

INSTALLED

WRONG.

REVERSE BELT WITH OPEN SIDE OF LINK DOWN.

DAMAGED OR WEAK OPERATING-ROD SPRING.

REPLACE.

OBSTRUCTION IN RECEIVER.

REMOVE OBSTRUCTION; CLEAN AND LUBRICATE AS REQUIRED.

DAMAGED OR WEAK FEED PAWLS AND SPRINGS OR FEED LEVER.

SENO TO DIRECT SUPPORT MAINTENANCE.

s i

FRONT/REAR CARTRIDGE GUIDE DEFECTIVE.

SEND TO DIRECT SUPPORT MAINTENANCE.

BOLT-CAM ACTUATOR ROLLER DEFECTIVE.

REPLACE ACTUATOR ASSEMBLY.

DEFECTIVE COVER LATCH.

SEND TO DIRECT SUPPORT MAINTENANCE.

FEED-CAM ASSEMBLY DEFECTIVE.

SEND TO DIRECT SUPPORT MAINTENANCE.

DEFECTIVE LATCH-LEVER ASSEMBLY.

SEND TO DIRECT SUPPORT MAINTENANCE.

! STOPPAGES j

| (CONTINUED) j

STOPPAGES j

PROBABLE CAUSE

CORRECTIVE ACTION 1

FAILURE TO CHAMBER.

RUPTURED CARTRIDGE CASE.

REMOVE <TM 9-1005-224-10).

CARBON BUILDUP IN GAS CYLINDER.

REMOVE CARBON.

CARBON BUILDUP IN RECEIVER.

REMOVE CARBON.

DAMAGED ROUND.

REMOVE ROUND AND RELOAD GUN.

DIRTY CHAMBER.

CLEAR BARREL AND CLEAN AND LUBRICATE AS REQUIRED.

WEAK OR SHORT OPERATING-ROD SPRING.

REPLACE.

FAILURE TO LOCK.

WEAK OR SHORT OPERATING-ROD SPRING.

REPLACE.

FOREIGN MATTER IN CHAMBER OF RECEIVER.

CLEAN AND LUBRICATE AS REQUIRED.

FAILURE TO FIRE.

FAULTY AMMUNITION.

REPLACE. I

BROKEN OR DAMAGED FIRING PIN OR FIRING-PIN SPRING.

REPLACE.

DEFECTIVE TRIGGER.

SEND TO DIRECT SUPPORT MAINTENANCE.

BROKEN OR DEFORMED SEAR PLUNGER AND/OR SPRING.

SEND TO DIRECT SUPPORT MAINTENANCE.

FAILURE TO LOCK.

SEE FAILURE TO LOCK.

I STOPPAGES

| (CONTINUED)

STOPPAGES I

PROBABLE CAUSE |

CORRECTIVE ACTION

FAILURE TO EXTRACT. 1

GAS PISTON INSTALLED BACKWARDS.

INSTALL PROPERLY {TM 9-1005-224-10).

BROKEN EXTRACTOR SPRING.

REPLACE.

CHIPPED OR BROKEN EXTRACTOR.

REPLACE.

DEFECTIVE EXTRACTOR PLUNGER.

REPLACE.

SHORT RECOIL.

CLEAN GAS PORTAND OPERATING-ROD TUBE, AND LUBRICATE AS REQUIRED. REPLACE DRIVER SPRING.

FAILURE TO COCK.

BROKEN SEAR.

SEND TO DIRECT SUPPORT MAINTENANCE.

WORN OPERATING-ROD SEAR NOTCH.

SEND TO DIRECT SUPPORT MAINTENANCE.

BROKEN, DEFECTIVE, OR MISSING SEAR PLUNGER AND/OR SPRING.

SEND TO DIRECT SUPPORT MAINTENANCE.

SHORT RECOIL.

CLEAN GAS PORTAND AND OPERATING-ROD TUBE, AND LUBRICATE AS REQUIRED. REPLACE DRIVER SPRING.

IMMEDIATE ACTION

Immediate action is action taken to reduce a malfunction or stoppage without looking for the cause. Immediate action should be taken in the event of either a misfire or a cookoff.

A MISFIRE is the failure of a chambered round to fire. Such failure can be due to an ammunition defect or faulty firing mechanism. A misfire is not dangerous, but it is handled as described below.

A COOKOFF is the firing of a round by the heat of a very hot barrel, and not by the firing mechanism. A cookoff may be avoided by applying immediate action within 10 seconds after a failure to fire.

If an M60 machinegun stops firing, the following actions are taken WITHIN 10 SECONDS:

• Cock the gun, and watch the ejection port to see if a cartridge case, belt link, or round is ejected. Insure that the bolt remains to the rear to prevent double feeding if a round or cartridge case is not ejected. (See TM 9-1005-224-24 for detailed explanation of double feeding.)

• If a cartridge case, belt link, or a round is ejected, return cocking handle to forward position, re-lay on the target, and try to fire. If the gun still does not fire, clear it and inspect the ammunition and the gun to determine the cause of the stoppage-

• If a cartridge case, belt link, or round IS NOT ejected, take remedial action as outlined in the following paragraphs.

REMEDIAL ACTION

Remedial action is also taken immediately in case of a stoppage, but it includes an attempt to determine the cause.

COLD GUN

If the stoppage occurs with a cold gun, raise the cover and remove the belt of ammunition. Raise the feed tray and inspect the chamber.

If there is no round in the chamber, reload and try to fire. If the gun fires, continue firing. If it does not fire, reapply immediate and remedial action as necessary. Inspect the gun and the ammunition.

If there is a round in the chamber, close the cover and try to fire. If the gun fires, reload and continue firing. If it does not fire, clear the gun and inspect the gun and ammunition.

HOT GUN

If the stoppage occurs with a hot gun (200 rounds in 2 minutes), move the safety to SAFE, raise the cover, and remove the ammunition belt. Raise the feed tray and inspect the chamber.

NOTE: During training, an experienced gunner should wait 15 minutes and then clear the gun.

If there is no round in the chamber, reload and try to fire. If the gun fires, continue firing- If it does not fire, reapply immediate and remedial action as necessary. Inspect the gun and the ammunition.

If there is a round in the chamber, close the cover and try to fire. If the gun fires, reload and continue firing. If it does not fire during combat, change barrels, reload, and continue firing. If the gun does not fire during training, wait 15 minutes and then clear the gun and inspect it for cause.

JAMMED COCKING HANDLE

If a stoppage occurs and the cocking handle cannot be pulled to the rear by hand {the bolt may be fully forward and locked or only partially forward), the following steps should be taken:

• Try once again to work the cocking handle by hand. Do not try to force the cocking handle to the rear with your foot or a heavy object. This could damage the gun.

• If the gun is hot enough to cause a cookoff, move all soldiers a safe distance from the gun and keep them away for 15 minutes. (Reference chapter 3, TM 9-1005-224-25.)

• After the gun has cooled, open the cover and disassemble it, keeping rearward pressure on the cocking handle until the buffer is removed-(Two soldiers will be required to do this.)

• Remove the round or fired cartridge. A cleaning rod or ruptured-cartridge extractor should be used if necessary.

In a training situation, after completing the remedial action procedures, the gun should not be fired until it has been inspected by an ordnance specialist

In a combat situation, after the stoppage has been corrected, change the barrel and try to fire. If the gun fails to function properly, it should be sent to the unit, armorer.

MAINTENANCE

Maintenance of the M60 machinegun includes inspection, cleaning, and replacement of parts. A complete operator's and organizational maintenance guide is found in TM 9-1005 224 and TM 9 1005-224-24.

INSPECTION

Inspection begins with the gun dis assembled in its major groups or assemblies. Note that shiny surfaces on parts do not mean the parts are unserviceable.

Inspect the following parts of the gun and related equipment for the conditions indicated:

Stock Group. The stock group should not be cracked and must fit. securelv on the receiver assembly.

The guide rails should not be cracked, bent, or burred.

The shoulder rest and stock latch should function correctly.

The rubber coating (covering the stock, forearm, trigger mechanism, cover, and carrying handle) should be checked for signs of gumming or cracking. If these parts are cleaned with solvents, they may soften and become unserviceable.

Buffer and Operating-Rod Group. The voke and voke recess should not be be burred,

cracked, or bent.

The buffer plunger must fit easily into the recess in the driving-spring guide.

The driving spring should not have any kinks, and the wires should not be broken or separated.

The driving-spring guide should be straight, and the spool should he tight on the shaft.

The sear notch on the operating rod should not show excessive wear or burring.

Bolt Group- The bolt plug, bolt-plug pin, and actuatnrcam assembly should be checked for visible damage-

The firing pin should be checked for cracks and wear on the tip.

The ejector and extractor should be checked to insure that they are under spring tension and are not chipped or worn.

Trigger-Mechanism Group. The shoulder of the sear should not show excessive wear.

The group should be checked for cracks near the retaining pins.

The leaf spring should be under tension.

The safety should function properly. (The sear should move only slightly when the safety lever is on SAFE, and freely when the safety lever is on FIRE-)

Barrel Group. (Both barrels should be checked.) The flash suppressor should be tight. The front sight and barrel-locking cam should not be bent, cracked, burred, or excessively worn.

The bipod assembly should be checked to insure that it functions properly.

The gas piston and gas cylinder should not be burred, and the gas piston should move freely when the barrel is tilted end-for-end. The tolerance between the wall of the gas cylinder and the gas piston is so small that the moving gas piston cleans itself. Therefore, the gas system should be disassembled and cleaned ONLY when the gun fires sluggishly and no other reason for the sluggishness can be found. The detent on the tab lock washers of the gas-cylinder nut and gas-cylinder extension should not be broken.

The bleeder hole in the gas-cylinder extension should be clear.

Cover, Feed Tray, and Hanger Group-

The cover latch should work properly.

CARRYING CASE WITH CONTENTS

RECEIVER BRUSH

CHAMBER BRUSH

BORE BRUSH

R UPTUR ED-CARTRIDG E EXTRACTOR

SPARE-BARREL CASE

SLING

COMBINATION TOOl

CLEANING ROD

COMBINATION TOOl

CLEANING ROD

CHAMBER BRUSH

BORE BRUSH

R UPTUR ED-CARTRIDG E EXTRACTOR

SPARE-BARREL CASE

M60 Treceiver Group

SPARE BARREL

SPARE BARREL

M60 Barrel Carrying CaseAsbestos Mittens

ASBESTOS MITTEN

Ml* Jul

Ml* Jul

ASBESTOS MITTEN

All parts inside the cover should be under spring tension.

The cover should not be bent or torn.

When reassembled, the cover should remain open without support.

The belt-holding pawl must be under spring tension.

Forearm Assembly.The assembly must not be bent.

The spring in the latch hole must work properly.

Receiver Group. The receiver should not be bent or cracked-

The cocking handle should slide freely within its guide.

The elevation scale on the rear sight must be movable and legible. The elevation-scale screw should not be burred or worn.

Mount. The traversing and elevating mechanism should not bind- The numbers on the scales and dials must be legible.

Distinct clicks must be heard when the handwheels are turned- Index lines should be calibrated with the indicator pointer.

The pintle should fit snugly in the pintle bushing, and the pintle lock should hold the pintle securely.

The sleeve latch should function properly, and the traversing bar should be tight when the tripod legs are spread and latched.

Carrying Case. Maintenance tools and equipment should be complete and serviceable.

The case should be serviceable. Frequent washing of the case should be avoided- Such washing may destroy the waterproofing and shrink the case.

CLEANING AND LUBRICATION

The M60 machinegun should be cleaned immediately after firing.

It should be disassembled into its major groups or assemblies for cleaning-

All metal components and surfaces that have been exposed to powder fouling should be cleaned using cleaner, lubricant, preservative (CLP) on a bore-cleaning patch. Use CLP on the bristles of the receiver brush to clean the receiver. CAUTION: TAKE CARE TO AVOID GETTING CLP IN THE GAS CYLINDER WHEN CLEANING THE BARREL, POSITION THE GAS CYLINDER ABOVE THE BARREL DURING CLEANING.

The gas-cylinder components will be removed and cleaned only when inspection shows that the piston will no longer move within the cylinder under its own weight when the barrel is tilted end-for-end- Under supervision of organizational maintenance personnel, disassemble and clean the gas cylinder and gas port. The receiver brush and swab-holding section of the cleaning rod may be used to clean the interior of the gas cylinder- When CLP is used, wipe the gas cylinder and gas piston dry before assembly. After assembly, check for free movement of the gas piston by tilting the barrel assembly. The unit armorer will rewire the gas-port plug (not removed by operator).

NOTE: Use a cloth lightly saturated in CLP on exterior surfaces to prevent corrosion.

After the M60 is cleaned and wiped dry, apply a thin coat of CLP by rubbing with a cloth. This will lubricate and preserve the exposed metal parts under all normal temperature ranges.

Lubricate moving parts, as described below, with CLP:

Barrel group. On the camming surfaces of the bolt-locking lugs.

Operating rod. On the rollers and those surfaces, immediately below the yoke, that ride within the receiver rails.

Cover. In the feed-cam assembly.

Bolt. On the bolt-locking lugs and actuator cam roller, and in the camming recess (for the operating rod).

Receiver. On the receiver rails.

After lubricating, cycle the components by hand to spread the CLP.

Guns fired infrequently or stored for prolonged periods should have a light film of CLP applied to the interior of the gas cylinder and the gas piston immediately after cleaning or after inspection. Preventive maintenance will be performed every 90 days, unless inspection reveals more frequent servicing is necessary. The use of the lubricant will NOT eliminate the requirement for cleaning and inspecting to insure that corrosion has not formed. Before using, the gas system and components must be clean and free of oil and lubricants.

Clean all exposed surfaces of the Ml22 tripod, pintle assembly, and traversing and elevating mechanism. Wipe dry and lubricate with CLP.

The following procedures apply to cleaning and lubricating the M60 under unusual conditions:

9 Below " 18 degrees Celsius (0 degrees Fahrenheit)--use lubricating oil, arctic weather (LAW) and oil lightly to avoid freezeup.

0 Damp or salty air—use CLP. Clean and apply frequently.

• Sandy or dusty areas—use CLP. Clean and apply frequently. Wipe with a rag after each application to remove excess.

ACTIONS BEFORE, DURING, AND

AFTER FIRING

Before firing:

• Inspect the gun as outlined in crew drill.

© Inspect the spare barrel.

• Insure that the gun is properly lubricated.

During firing:

d Change the barrels as prescribed in chapter 1. Barrel changing will prolong the life of both barrels.

• Periodically inspect the gun to insure that it is properly lubricated.

O When malfunctions or stoppages occur, follow the procedures previously given.

After firing:

0 Clear and clean the gun immediately

© During periods of inactivity, clean and lubricate every 90 days unless inspection reveals more-frequent servicing is necessary (paragraph 2-1 la, TM 9-1005-224-24).

MAINTENANCE UNDER NBC

CONDITIONS

If contamination is anticipated, apply oil to all outer metal surfaces of the gun and accessories. DO NOT OIL AMMUNITION. Keep the gun covered as much as possible-

If the gun is contaminated, decontami-nae it as prescribed by FM 21-40 and TM 3220, and then clean and lubricate.

DESTRUCTION

The gun and mount will be destroyed only on the authority of the unit commander, in accordance with orders or policy of the Army commander. Report the destruction through command channels.

Disassemble the gun as completely as time permits. Using the barrel or tripod mount, destroy the parts in the order listed below:

(2) Buffer and operating-rod group.

(4) Sights, rear and front.

To destroy the gun by burning, place an incendiary grenade on the receiver group over the bolt (with the cover resting on the grenade) and fire the grenade.

Bury the disassembled gun or dump the parts into streams, mud, snow, sumps, or latrines.

Smash the traversing and elevating mechanism and pintle assembly. Rend the tripod legs.

CHAPTER 6

Affection Roadblocks

Affection Roadblocks

Removing The Setbacks In Love. Particular issues may prevent you from easily forging fresh  connections and intensifying your existing ones, holding you in a ceaseless state of disconnection. Here are a few of the most basic roadblocks that take you out of alignment with affection.

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Responses

  • elizabeth
    How to do chemical fusion on defective waterproofing?
    7 years ago
  • Hagosa
    What are two of the more common malfunctions associated with ammunition?
    7 years ago
  • Tyko
    How common is a m60 run away malfunction?
    2 years ago
  • kenzie
    What happens if the sear of 7.62mm pistol broken?
    2 years ago
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