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 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - CONTINUED 1-14.3 Location and Description of Cab Hydraulic Systems The elevating system, traversing system, and projectile rammer hydraulic systems are supplied with pressurized hydraulic fluid by power pack assembly (1). The top part of the power pack assembly is a power pack hydraulic fluid reservoir which contains a hydraulic rotary pump driven by a direct current motor in the base of the power pack assembly. Immediately next tothepowerpackassembly is the main accumulator (2) which ensures constant hydraulic pressure during operation of any hydraulic system. a. Elevating System. The elevating system is used to elevate, depress, and balance the cannon. It maybe controlled from either gunner’s control assembly (3) or assistant gunner’s control assembly (4). The elevating system consists of equilibrated elevating cylinder (5), primary accumulator (6), secondary accumulator (7), elevation selector valve as- sembly (8), and hand pump (9) for adjusting balance of the equilibrated elevating cylinder. The manual elevating hand pump (10) mounted on assistant gunner’s control assembly provides ability to operate elevating system in the event of hydraulic power failure. 1-16