Section 1. OPERATION
Operation includes loading or unloading the gun, clearing the gun, or allowing the bolt to go forward.
14. Half-Loading and Loading the Gun a. To half-load the gun, the gunner insures the bolt is forward and the cover is closed. The assistant gunner inserts the double loop end of the ammunition belt in the feedway until the first round is engaged by the belt holding pawl. The gunner grasps the retracting slide handle with the right hand, palm up, and vigorously jerks the bolt to the rear and releases the retracting slide handle. If the bolt latch release lock is engaging the bolt latch release, the bolt and retracting slide handle will move forward under pressure of the driving spring group, half-loading the gun. However, if the bolt latch release is up and free of the bolt latch release lock, the bolt latch will hold the bolt and retracting side handle to the rear. The retracting slide handle must be returned to its most forward position prior to releasing the bolt. To complete half-loading, press the bolt latch release, allowing the bolt to go forward.
b. To fully load the gun, the procedure is the same as in half-loading, except it requires the gunner to pull and release the bolt twice.
15. Unloading and Clearing the Gun a. To unload the gun, the gunner unlocks the bolt latch release (if applicable) and raises the cover. The assistant gunner lifts the ammunition belt from the feedway. The gunner pulls the bolt to the rear and examines the chamber and T-slot to insure they hold no rounds. In darkness, the gunner must feel the chamber and T-slot.
b. To clear the gun additional precautions are taken. After the steps above have been accomplished, a wooden block, extending above and below the receiver approximately one inch, is inserted in the receiver between the bolt and the rear of the barrel. A cleaning rod is then inserted in the muzzle end of the barrel, pushed through the bore until it can be seen in the receiver, and immediately removed (fig 84).
c. During any temporary cessation of fire, where it is not necessary to unload or clear the gun, the bolt should be latched to the rear to prevent accidental firing.
16. Precautions During Operation a. Insure that the cover (once raised) remains in the raised position, with the barrel remaining in the gun, before allowing the bolt to go forward.
b. If the cover is lowered when the bolt ia to the rear, the belt feed lever lug will not fit into its proper groove in the bolt. Thus, parts may be damaged as the bolt goes forward. In the cover assembly, the belt feed lever lug is held to the left by the action of the shoulder headless pin and spring, j ust above the pivot.
c. If the bolt is allowed to go forward with the barrel out of the gun, parts may be damaged when the bolt slams forward. The added weight and cushioning effect of the barrel act as a buffer and protect the parts from damage.
d. To allow the bolt to go forward with the barrel out of the gun, pull the retracting slide handle all the way to the rear, engaging the bolt stud in the notch in the rear of the retracting slide. Maintain a steady pressure to the rear on the retracting slide handle; press the bolt latch release and allow the bolt to ride slowly forwar
17. Single Shot Operation a. To fire the gun single shot, the bolt latch release must be in the up position. The latch engages the notches on top of the bolt when the bolt is to the rear after each round is fired.
b. When the bolt latch release is depressed the latch assembly is raised, allowing the bolt to be driven forward into battery. The gun may then be fired by pressing the trigger.
c. When the bolt latch release is locked down by the bolt latch release lock on the buffer tube sleeve, the gun functions as an automatic weapon. . -
Section IF. FUNCTIONING
а. The cycle of operation is broken down into eight basic steps. More than one step may occur at the same time. The steps are listed below in the order explained:
(1) Feeding. Feeding is the action of placing a cartridge in the receiver, approximately in back of the barrel» ready for chambering.
(2) Chambering. The round is placed in the chamber.
(8) Locking. The bolt is locked to the barrel and barrel extension.
(4) Firing. The releasing of the firing pin, igniting the primer of the cartridge.
(5) Unlocking. The bolt unlocks from the barrel and barrel extension.
(8) Extracting. The empty cartridge case is pulled from the chamber.
<7) Ejecting. The empty cartridge case is ejected from the receiver.
(8) Cocking. The firing pin is withdrawn into the cocked position.
б. With the Browning machinegun, caliber .50 HB, M2, the recoiling groups must be manually operated to place the first round in the chamber. The cycle of operation begins with the first round positioned over the belt holding pawl. The recoiling groups are in their forward position.
(1) When the bolt is fully forward, the belt feed slide is in the cover; the ammunition belt is held in the feedway by the belt holding pawl (fig 85 and 86).
(2) As the bolt moves to the rear, the cam grooves guide the belt feed lever, pivoting the lever and moving the slide out the side of the cover (ftg 87). The belt is held stationary by the belt holding pawl, while the belt feed pawl pivot compressing its spring, and rides up over the link holding the first round (flg 88).
(8) When the bolt is all the way to the rear, the belt feed slide moves out far enough to allow the belt feed pawl spring to force the pawl down behind the first round (fig 89).
(4) As the bolt moves forward, the belt feed lever moves the slide back into the receiver. The
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