TM-9-2350-311-10
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; OPERATOR’S MANUAL
NOVEMBER 1994
TM-9-2350-311-10 - Page 44 of 775
TM 9-2350-311-10
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LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
Location and Description of Major External Components
CANNON AND HOWITZER ASSEMBLY
TRAVEL LOCK ASSEMBLY
HEADLIGHT
FINAL DRIVE DRAIN PLUG
ENGINE OIL LEVEL CHECK ACCESS
DOOR
FRONT LIFTING EYE
FRONT TOWING EYE
BILGE PUMP OUTLET
DRIVE SPROCKET AND HUB
ROAD WHEELS
TRACK ASSEMBLY
HULL
CAB
CAB SIDE DOOR
COMMANDER’S CUPOLA
M2 CALIBER 50 MACHINE GUN
PANORAMIC TELESCOPE BALLISTIC
COVER
CAB WEATHER COVER
The mount and howitzer assembly consists of a 155MM can-
non assembly which is the primary armament for the M109
series howitzer. The M185 cannon assembly and M178 mount
assembly are used on M109A2/M109A3/M109A4 howitzers.
The M284 cannon assembly and M182 mount are used on
M109A5 howitzers.
Locks cannon tube in place.
Two headlights provide light for night driving and blackout
conditions.
Two final drive drain plugs provide access for final drive filling
or oil level check.
Provides access for checking engine oil level.
Two front lifting eyes provide connection points for lifting howit-
zer.
Two front towing eyes provide connection points for towing
howitzer.
Provides outlet for fluids during bilge pump operation.
One drive sprocket mounted on hubs is located on each side of
the vehicle and distributes power to track assembly.
There are seven sets of road wheels on each side of vehicle
located between the sprocket and idler wheels.
Consists of track shoes connected together by end connectors.
Rotates to provide mobility to howitzer.
Provides mobility for howitzer and crew.
Provides crew protection and is area where firing is controlled.
Two cab side doors provide emergency exit.
Serves as mount and support for M2 machine gun, holds M27
periscope, and rotates manually 6400 mils.
A heavy barrel machine gun that fires manually. Refer to
TM 9-1005-213-10 for more information.
Protects M117/M117A2 panoramic telescope against shock
during firing and inclement weather.
Protects upper gun rotor.
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