M2/M3 BFV: TROUBLESHOOTING - OD1610 - LESSON 2/TASK 1
This retracts the firing pin, raises the operating lugs, and
removes the spent case. As the bolt moves to the rear, the spent case is
The live round moves into the feed tray.
The bolt goes to the
rear until it strikes the assembly. The cycle is repeated as long as the
trigger is held.
(e) Coax Machinegun Feed System. Eight hundred rounds of ammo are
stored in the ammo can. The ammo is in a belt held together by links. The
belt feeds through the forwarder, feed chute, feed tray, and then to the
used casings eject into a plenum around the weapon. A sensor detects when
the last rounds are about to be fired and stops firing. This leaves the end
of the belt in a position to easily reload.
The reloader can link a new
belt to the old belt. If needed, the gunner can continue to fire since he
can override the automatic shutoff.
(f) Coax Machinegun Mounting.
the front cradle assembly by lug mounts on the receiver. The rear of the
coax machinegun is secured to the rear mount on the coax rotor.
(3) Auxiliary Systems.
(a) Turret Ventilation System.
When one of the weapons is
automatically. When the weapons are manually fired, fans on the right side
of the rotor can be manually used.
(b) Smoke Grenade Launcher. Two electrically fired smoke grenade
launchers are on the front sides of the turret. One is on the right, and
one on the left.
Each launcher carries four smoke grenades.
switch on the weapon control box launches all eight smoke grenades at the
When fired, the smoke grenades form a smoke curtain some
distance from the vehicle. Crew members can manually reload smoke grenades
through the cargo hatch.
(c) Radios. Two antenna mounts and an MT-1029/VRC radio mount are
provided with the vehicle. Both antenna mounts are on the turret. One is
on the right side of the commander's hatch and the other at the rear of the