TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 1–11 1–11.1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 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. 1-6