TM-9-2350-311-20-2
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS
DECEMBER 1993
TM-9-2350-311-20-2 - Page 42 of 828
TM 9--2350--311--20--2
1--11
1--14.2
Location and Description of Major External Components
a. Mount And Howitzer Assembly. The mount and howitzer assembly (1) contains a 155MM cannon assembly, a gas oper-
ated bore evacuator (not shown), a muzzle brake (not shown), an interrupted screw breechblock, and a counter recoil
activated breech mechanism with provision for manual operation, and has a variable recoil capability (long recoil-low
angle, short recoil-high angle). It is central bore mounted and fired mechanically by lanyard.
b. Caliber 50 Machine Gun, M2. The automatic, recoil operated, link belt fed, heavy barrel M2 caliber 50 machine gun (2)
has a flexible type configuration and is fired manually.
c.
Panoramic Telescope Ballistic Cover. The panoramic telescope ballistic cover (3) provides clear field of view for
M117/M117A2 panoramic telescope and traverses 6400 mils.
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