Auto Gun Receiver Operation Continued

c. TRACK ASSEMBLY: Driven by the track drive sprocket. The track assembly accomplishes the following during each complete cycle:

(1) Sear engages master link and positions the roller assembly chain before firing.

MASTER LINK 1df0016

(2) After sear release, drive sprocket drives the roller assembly chain including master link and master link slider.

SLIDER

CHAIN

SLIDER

CHAIN

(3) Master link slider fits into the slider path in the bolt and carrier assembly. As roller assembly chain rotates (counterclockwise) around sprockets, the slider moves the bolt and carrier assembly forward and backward.

M242 Bolt And Track

(4) When bolt and carrier assembly is in the forward position, the slider moves from right to left across the slider path (firing dwell time to allow hot gases to escape).

BOLT AND CARRIER ASSEMBLY

(5) When bolt and carrier assembly is in the rear position, the slider moves from left to right across the slider path (feed dwell time to allow a new round to be positioned in the bolt face, and the spent case positioned in front of the ejector).

BOLT CARRIER TO REAR

1df0020

AUTO GUN RECEIVER OPERATION - Continued

Gun Track Assembly Forward

1df0021

d. BOLT AND CARRIER ASSEMBLY: Driven by track assembly. The bolt and carrier assembly accomplishes the following operations during each complete cycle:

(1) When the carrier assembly is in the rear position, the feeder assembly rotor positions a new round in the bolt face.

(2) Rotation of the roller assembly chain (counterclockwise) moves the carrier assembly forward. In the forward position, locking lugs on the bolt lock into the breech locking lugs.

(3) Firing assembly pin is cocked, then released, and the round fires.

(4) Bolt and carrier assembly starts to move to the rear, unlocking the bolt and breech lugs, and extracts the spent case.

(5) In SEAR position, the gun is locked in the open bolt position and ready to repeat the firing cycle.

STRAIGHT DRIVE SHAFT GOES THROUGH THE RECEIVER ASSY CLUSTER GEAR, & INTO THE FEEDER ASSY WORM SHAFT.

Was this article helpful?

0 -2

Post a comment