TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 3–13 b. Cannon The cannon consists of the muzzle brake, thrust collar, cannon tube, bore evacuator, mount, variable recoil mechanism, breech assembly and firing mechanism. Below is a pictorial view of the cannon with all the major assemblies installed. The muzzle brake and variable recoil mechanism reduce and absorb the recoil of the cannon tube during the firing sequence. The breech assembly houses the projectile and propellant during a firing. The firing mechanism is used to fire the cannon. THRUST COLLAR BORE EVACUATOR UPPER GUN ROTOR MUZZLE BRAKE TUBE BALL VALVES DUST SHIELD RECUPERATOR LOWER GUN SHIELD HOWITZER MOUNT TRUNNION BEARING RECUPERATOR BUFFER CYLINDER BREECH OPERATING CAM VARIABLE RECOIL MECHANISM CANNON