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 54 of 775
TM 9-2350-311-10
1-11
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - CONTINUED
1-11.5
Location and Description of Major Internal Cab Components
1 RAMMER ASSEMBLY
2 TRAVERSING MECHANISM
3 SIGHTING EQUIPMENT
4 EQUILIBRATED ELEVATING CYLINDER
5 M2A2 AIR PURIFIER
6 M3 ELECTRICAL AIR HEATER
7 GUNNER’S SELECTOR SWITCH
BOX ASSEMBLY
1-16
Weapon mounted and hydraulically powered, with positive ram.
Its two positions are stow and ram.
Allows the cab to traverse 6400 mils.
Provides optical laying and boresighting of howitzer for both
direct and indirect firing.
Provides elevation and depression of cannon assembly. Also
provides hydraulic balance to offset the weight of the cannon
assembly.
Provides filtered air to the M3 electrical air heaters.
Three M3 electrical air heaters control temperature in each cab
station for personal comfort.
Controls cab power, manual or power traversing, and eleva-
tion.
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