TM-9-2350-311-34-2 Maintenance Manual for Volume 2 M109 Cab Download
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TM 9-2350-311-34-2 1-14.12 Location and Description of Commander’s Cupola The hatch cover (1) of the commander’s cupola is hinged on the side opposite the machine gun support assembly (2) and counterbalanced with a torsion bar (3) for ease of opening. A spring-loaded latch (4) holds the hatch cover in full open position and creates a positive lock in closed position. Cupola body assembly (5) is supported by a mechanism of bearing rings (6) and bearing balls to permit easy 360° manual traverse. A spring-loaded latch (7) can lock commander’s cupola in traverse at intervals of 30° around the circle. A periscope slot (8) at the front of the commander’s cupola permits mounting of a periscope for observation by the commander. COMMANDER’S CUPOLA WITH OUTSIDE LATCH (SOME M109A3/M109A4/M109A5 HOWITZERS) COMMANDER’S CUPOLA WITHOUT OUTSIDE LATCH (ALL M109A2 AND SOME M109A3/M109A4/M109A5 HOWITZERS) Change 2 1-31