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071-312-3025 (SL1) - Maintain an M60 Machine Gun

Standards: 1. Disassembled the M60 machine gun into the following groups: stock; buffer and operating rod; bolt assembly; trigger mechanism; barrel; feed cover, feed tray, and hanger; forearm; and receiver. 2. Cleaned the M60 machine gun, removed powder fouling and other foreign material and identified any unserviceable parts. Did not get CLP in the gas cylinder. 3. Lubricated the M60 machine gun. 4. Assembled the M60 machine gun, performed a function check, ensured the forearm group was locked in place, the hinge pin was interlocked with the latch engaging the sear pin, and the stock group latch engaged.

Conditions: Given an M60 machine gun that needs to be cleaned and
inspected. You have a cleaning kit, cleaner
lubricant preservative (CLP), lubricating
oil arctic weather (LAW), swabs, a dummy
cartridge, and a field table or ground cloth
on which to work.

Standards:

1.
Disassembled the M60 machine gun into the
following groups: stock; buffer and
operating rod; bolt assembly; trigger
mechanism; barrel; feed cover, feed tray,
and hanger; forearm; and receiver.

2.
Cleaned the M60 machine gun, removed powder
fouling and other foreign material and
identified any unserviceable parts. Did not
get CLP in the gas cylinder.

3.
Lubricated the M60 machine gun.

4. Assembled the M60
machine gun, performed a function check,
ensured the forearm group was locked in
place, the hinge pin was interlocked with
the latch engaging the sear pin, and the
stock group latch engaged.

Performance Steps

WARNING:
Weapon must
be clear before disassembling.

1.   Clear the M60 machine gun.

a.
Pull the cocking handle to
the rear.

b.
Lock the bolt to the rear.

c.
Raise the feed cover.

d.
Ensure the chamber is
empty.

e.
Close the feed cover.

f. 
Place the safety lever on
FIRE.

g.
Pull the cocking handle to
the rear and hold it.

h.
Pull the trigger and allow
the bolt to ease forward.

i.  
Place the selector lever on
SAFE.

2.   Remove the stock group.

a.
Raise the hinged shoulder
rest.

b.
Insert the nose of a dummy
cartridge into the latch hole (figure 071-312-3025-1).





Figure 071-312-3025-1.
Stock

 

c.
Push the latch down.

d.
Pull the stock group to the
rear, removing it from the M60 machine
gun.

3.   Remove the buffer, operating rod, and bolt assembly
group.

a.
Remove the buffer.

(1) 
Press the exposed buffer
lightly with the palm of the hand
(figure 071-312-3025-2).





Figure 071-312-3025-2.
Buffer yoke

(2) 
Remove the buffer yoke from
the top of the receiver.

(3) 
Remove the buffer slowly by
pulling it rearward. Allow the driver
spring guide to expand until the end
of the guide is showing at the rear of
the receiver.

(4) 
Pull the buffer plunger
from the driver spring guide (figure 071-312-3025‑3).





Figure 071-312-3025-3.
Buffer

 

(5) 
Pull the driver spring
guide and spring from the receiver.

(6) 
Separate the driver spring
from the driver spring guide.

b.
Remove the operating rod
and bolt.

(1) 
Grasp the pistol grip with
the left hand.

(2) 
Pull the cocking handle to
the rear with your right hand until
the bolt separates from the barrel
socket.

(3) 
Return the cocking handle
to the forward position.

(4) 
Pull the cam roller until
it stops. This pulls the rod and bolt
to the rear.

(5) 
Push the bolt to the rear
with your finger on the face of the
bolt (figure 071-312-3025-4).





Figure 071-312-3025-4.
Cam roller
 


 

(6)  Grasp the operating
rod and bolt when they are about 4
inches out of the cylinder to prevent
the bolt from rotating.

(7)  Pull the operating
rod and bolt from the receiver (figure
071-312-3025-5).






Figure 071-312-3025-5.
Operating rod and bolt

 

(8) 
Relax your grip, allowing
the bolt to rotate slowly.

(9) 
Grasp the bolt and
operating rod with both hands. The
bolt should be on the bottom, facing
away from your body.

(10)
Disengage the bolt from the
operating rod by pulling forward on
the operating handle and lifting
upward (figure 071-312-3025-6).





Figure 071-312-3025-6.
Bolt assembly and operating rod being
separated

 

4.   Remove the trigger mechanism group consisting of
the grip, leaf spring, and retaining
pin.

a.
Press in on the rear of the
leaf spring.

b.
Rotate the rear of the leaf
spring up to clear it from the sear
pin (figure 071-312-3025-7).



Figure 071-312-3025-7. Sear pin

 

c.
Pull the leaf spring to the
rear, disengaging it from the front
notch of the retaining pin.

d.
Remove the retaining pin by
pushing it to the left.

e.
Remove the trigger
mechanism.

(1) 
Slide the trigger mechanism
slightly forward.

(2) 
Rotate the front of the
trigger mechanism housing down.

(3) 
Remove the trigger
mechanism (figure 071-312-3025-8).






Figure 071-312-3025-8.
Trigger mechanism group

 

5.   Remove the cover, feed tray, and hanger group.

a.
Remove the feed cover.

(1) 
Raise the feed cover.

(2) 
Unlock the hinge pin using
a pointed object (figure 071-312-3025-9).





Figure 071-312-3025-9.
Hinge pin latch

 

(3) 
Push the hinge pin out of
its recess and remove it from the
opposite side of the hinge pin latch.

(4) 
Lift the feed cover from
the receiver assembly.

(5) 
Remove the feed cover
spring from the cover.

b.
Lift the feed tray and
hanger group from the receiver
assembly (figure 071-312-3025-10).





Figure 071-312-3025-10.
Feed tray and hanger group

 

6.   Remove the barrel group, made up of the barrel,
flash suppressor, front sight, bipod
assembly, and gas cylinder system.

a.
Push in on the barrel
locking lever plunger (figure 071-312-3025-11).





Figure 071-312-3025-11.
Barrel locking lever

 

b.
Raise the barrel locking
lever to the vertical position.

c.
Remove the barrel group by
pulling it straight to the front of
the rifle.

7.   Remove the forearm assembly.

a.
Turn the receiver so the
top is facing down.

b.
Insert a pointed object
into the latch hole at the bottom rear
of the forearm assembly (figure 071-312-3025-12).





Figure 071-312-3025-12.
Forearm latch

 

c.
Release the forearm latch
by pressing downward with a pointed
object.

d.
Raise the rear of the
forearm assembly slightly.

e.
Pull the forearm assembly
to the front to remove it.

Note. This completes general disassembly of the M60 machine
gun. The receiver group requires no
disassembly.

8.   Clean the M60 machine gun.

CAUTION:
Do not use
gasoline, kerosene, benzene, or high
pressure water, steam, or air for
cleaning.

a.
Position the gas cylinder
above the barrel during cleaning so as
not to get CLP in the gas cylinder.

b.
Clean the bore using CLP
and a bore brush attached to a
cleaning rod.

(1) 
Run the brush through the
bore without reversing the direction
of the brush while it is in the bore.

(2) 
Repeat the preceding step
until most of the powder fouling and
other foreign matter have been
removed.

(3) 
Swab out the bore several
times using a cleaning rod and a swab
wet with CLP.

(4) 
Swab out the bore several
times using a cleaning rod and a dry
swab.

c.
Clean the chamber using CLP
and a chamber brush attached to a
cleaning rod.

(1) 
Run the brush through the
chamber.

(2) 
Repeat the preceding step
until most of the powder fouling and
other foreign matter have been
removed.

(3) 
Swab out the chamber
several times using a cleaning rod and
a swab wet with CLP.

(4) 
Swab out the chamber
several times using a cleaning rod and
dry swab.

d.
Clean the receiver with a
receiver brush and CLP.

(1) 
Brush the receiver until
most of the powder fouling and other
foreign matter have been removed.

(2) 
Swab out the receiver
several times using a cleaning rod and
a swab wet with CLP.

(3) 
Swab out the receiver
several times using a cleaning rod and
dry swab.

e.
Clean the buffer and
operating rod group using CLP and a
receiver brush. Do not submerge the
buffer in any cleaning solvents.

(1) 
Brush the buffer group
until powder fouling and other foreign
matter have been removed.

(2) 
Swab out the operating rod
several times using a cleaning rod and
a swab wet with CLP.

(3) 
Swab out the operating rod
several times using a cleaning rod and
a dry swab.

f. 
Wipe down all parts of the
M60 machine gun except the
rubber-coated parts with a rag wet
with CLP.

g.
Dry all parts cleaned with
CLP.

9.   Inspect the parts for serviceability.

a.
Stock group.

(1) 
Ensure the stock group fits
securely on the receiver.

(2) 
Check the guide rails for
cracks, bends, or burrs.

(3) 
Check the shoulder rest and
stock latch for binding.

(4) 
Check the rubber coating
for gumming or cracking.

b.
Buffer and operating rod
group.

(1) 
Check the yoke and yoke
recess for burrs, cracks, or bends.

(2) 
Ensure the buffer plunger
fits easily into the recess in the
driver spring guide.

(3) 
Check the driver spring for
kinks and broken or separated wires.

(4) 
Check the driver spring
guide for bends, ensuring the spool is
tight on the shaft.

(5) 
Check the sear notch on the
operating rod for excessive wear or
burring.

c.
Bolt assembly group.

(1) 
Check the bolt plug, bolt
plug pin, and actuator cam assembly
for chips and burrs.

(2) 
Check the firing pin for
cracks or wear on the tip.

(3) 
Check the ejector and
extractor to ensure they are under
spring tension and are not chipped or
worn.

d.
Trigger mechanism group.

(1) 
Check the shoulder of the
sear for excessive wear.

(2) 
Check the mechanism for
cracks (check carefully near the
retaining pins).

(3) 
Check the leaf spring to
ensure it is under tension.

(4) 
Check the safety for
correct function. (The sear should
move only slightly when the safety
lever is on SAFE, and freely when the
safety lever is on FIRE.)

e.
Barrel group.

(1) 
Check to ensure the
suppressor is tight.

(2) 
Check the front sight and
barrel locking-cam for bends, cracks,
burrs, or excessive wear.

(3) 
Check the bipod assembly
for correct functioning. (The legs
should lock in the up and down
position. The leg extension should
lock at the desired heights.)

(4) 
Check the gas piston and
gas cylinder for burrs.

(5) 
Check the detent on the tab
lock washers of the gas cylinder nut
and gas cylinder extension to ensure
it is not broken.

(6) 
Check the bleeder hole in
the gas cylinder extension to ensure
it is clear.

f. 
Feed cover, feed tray, and
hanger.

(1) 
Check to ensure all parts
inside the feed cover are under spring
tension.

(2) 
Check the feed cover to
ensure it is not bent or torn.

(3) 
Check the belt holding pawl
to ensure it is under spring tension.

g.
Forearm assembly.

(1) 
Check the assembly to
ensure it is not bent.

(2) 
Check the spring in the
latch to ensure it is not broken.

h.
Receiver group.

(1) 
Check the receiver to
ensure it is not bent or cracked.

(2) 
Check the cocking handle to
ensure it slides freely within its
guide path.

(3) 
Check the elevation scale
on the rear sight to ensure it is
legible. The elevation screw should
not be burred or worn.

10. Lubricate the M60 machine gun.

Note. When lubricating the M60 machine gun at temperatures
below 0 degrees Fahrenheit, use LAW
and lubricate lightly to avoid
freeze-ups; under all other
conditions, use CLP. When using LAW,
lubrication techniques are the same as
for CLP.

a.
Make sure you do not get
CLP inside the buffer assembly or
inside the gas cylinder.

b.
Run a cleaning patch with
several drops of CLP on it through the
bore.

c.
Wipe down all
non-rubber-coated exterior surfaces of
the M60 machine gun with a rag with
several drops of CLP on it.

d.
Use CLP to lubricate the
following surfaces.

(1) 
Bolt locking lugs by the
camming surfaces.

(2) 
Operating rod surfaces
along the receiver rails.

(3) 
Actuator roller on the bolt
and where the bolt actuator rides the
feed pawl carrier on the underside of
the cover assembly.

11. Assemble the M60 machine gun in the following order.

a.
Assemble the forearm group.

(1) 
Guide the forearm assembly
over the operating rod tube, ensuring
the operating rod does not strike the
baffles inside the forearm assembly.

(2) 
Align the recess in the
forearm assembly with the end of the
operating rod tube.

(3) 
Tap up on the bottom rear
of the forearm assembly with the palm
of your hand to lock it in position.

b.
Assemble the feed cover,
feed tray, and hanger group.

(1) 
Align the guides of the
feed tray and hanger on the left side
of the cover mounting brackets and
sear, the feed tray, and hanger in the
receiver.

(2) 
Replace the cover.

(a)  
Insert the cover spring in
the cover.

(b)  
Align the cover with the
mounting brackets.

(c)  
Insert the hinge pin from
the right side.

(d)  
Insert the hinge pin latch
from the left side, making sure that
the hinge pin and the hinge pin latch
interlock.

c.
Assemble the barrel group.

(1) 
Make sure the barrel
locking lever is in the vertical
position (figure 071-312-3025-11).

(2) 
Put the rear of the barrel
through the forearm assembly.

(3) 
Align the gas cylinder nut
with its recess in the forearm
assembly.

(4) 
Lower the barrel locking
lever to its most downward position.

d.
Assemble the trigger
mechanism group (figure 071-312-3025-8).

(1) 
Engage the holding notch of
the trigger mechanism group in its
recess in the bottom of the receiver
(figure 071-312-3025-8).

(2) 
Rotate the front of the
trigger mechanism up.

(3) 
Align the holes of the
trigger mechanism with the mounting
bracket on the receiver.

(4) 
Insert the retaining pin
from the left.

(5) 
Attach the leaf spring by
placing the open end of the leaf
spring on the retaining pin.

(6) 
Engage the hooked end to
the sear pin.

e.
Assemble the bolt and
operating rod group.

(1) 
Hold the bolt securely in
one hand with the camming slot up. The
face of the bolt should be toward the
body.

(2) 
Position the rear of the
operating rod yoke against the rear
firing pin spool with the other hand
(figure 071-312-3025-13).





Figure 071-312-3025-13.
Rear of operating rod yoke positioned against rear firing pin spool

 

(3) 
Push on operating rod,
compressing the firing pin spring.

(4) 
Position the operating rod
yoke between the firing pin spool.

(5) 
Push forward on the rear of
the bolt with the other hand, causing
the bolt to rotate until the locking
lugs are vertical and the cam roller
is up.

(6) 
Push the operating rod and
bolt (ensure the cam roller faces up)
into the receiver until the end of the
operating rod is even with the rear of
the receiver (figure 071-312-3025-14).





Figure 071-312-3025-14.
Operating rod and bolt

 

(7) 
Put the driver spring guide
into the driver spring.

(8) 
Put the free end of the
driver spring in the opening of the
operating rod.

(9) 
Pull the trigger.

(10)
Push in the driver spring until
the head of the guide is about one
inch from the receiver (figure 071-312-3025-3).

f. 
Assemble the buffer group
(figure 071-312-3025-3).

(1) 
Put the buffer plunger into
the driver spring guide.

(2) 
Push forward on the buffer
until the operating rod and bolt go
fully forward.

(3) 
Push in on the buffer until
the recesses on the buffer are aligned
with the recesses in the receiver.

(4) 
Place the buffer yoke in
the buffer recess on top of the
receiver.

g.
Assemble the stock group.

(1) 
Align the guide rails of
the stock group with the guide rails
on the receiver.

(2) 
Push forward until the
stock is fully seated. You will hear a
distinct click when the latch engages.

12. Perform a function check to ensure that the M60 machine gun is
assembled correctly.

a.
Place the safety on FIRE.

b.
Pull the cocking handle to
the rear.

c.
Return the cocking handle
forward to the locked position.

d.
Close the cover.

e.
Place the safety on SAFE.

f. 
Pull the trigger; the
weapon should not fire.

g.
Place the safety on FIRE.

h.
Pull the cocking handle to
the rear, holding it in that position.

i.  
Pull the trigger, allowing
the bolt to ease forward.

j.  
Store the weapon in the
arms room or continue the mission.

Evaluation Preparation: 

Setup: At the test site, provide one M60 machine gun, all required
cleaning equipment, and a field table or
ground cloth to work on.

Brief
Soldier: Tell the soldier to
disassemble, clean, assemble, and perform a
function check on the machine gun.

Performance
Measures

GO

NO GO

1.   Cleared the weapon so the selector lever was on
SAFE.

2.   Disassembled the weapon into the major groups
without damaging any components.

3.   Cleaned the weapon, removed the powder fouling and
other foreign material and dried all
components cleaned with CLP.

4.   Identified any damaged, worn, or malfunctioning
components.

5.   Assembled the weapon in the correct sequence
without damaging any components.

6.   Performed a function check, ensured the weapon
operated properly.

Evaluation
Guidance:
 
Score the soldier GO if all
performance measures are passed. Score the
soldier NO GO if any performance measure is
failed. If the soldier scores NO GO, show
him what was done wrong and how to do it
correctly.

References


 

Required


Related


 

FM
3-22.68

 

 

TM
9-1005-224-10

 

 

TM
9-1005-224-23&P

 

 


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