TM-9-2350-311-20-2

TM-9-2350-311-20-2 - Page 55 of 828

TM 9–2350–311–20–2

1–24

1–18 EQUIPMENT OPERATION AND DESCRIPTION — CONTINUED

1–18.1 Mount and Howitzer Assembly — Continued

Characteristics:

Loaded hydraulically or manually

Fired manually

Elevated and depressed either manually or hydraulically

Traversed 6400 mils by traversing the cab. Traversing is accomplished either hydraulically or manually.

Major Components:

M178 mount assembly (used with M185 cannon assembly) or M182 mount assembly (used with M284 cannon

assembly)

Tube assembly/cannon assembly

Tube Assembly/Cannon Assembly

CANNON TUBE. The cannon tube (1) serves as the chamber for the projectile. Rifled bore ensures accu-

rate projectile trajectory. Cannon tube mounts on inside of breech ring (2). Cannon tube locks inside breech

ring band (3) by means of interrupted threads and breech ring key (4).

BREECH RING KEY. The breech ring key (4) holds cannon tube (1) in correct position on breech ring (2).

The breech ring key prevents the cannon tube from turning and unlocking from interrupted threads.

BORE EVACUATOR. The bore evacuator (5) helps clear the cannon tube (1) of gases after firing, minimiz-

ing the contamination of the air within the cab.

MUZZLE BRAKE. The muzzle brake (6) reduces the force of recoil and forward flash, and deflects gases

away from the cab.