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 1–14 EQUIPMENT OPERATION AND DESCRIPTION — CONTINUED 1–14.9 Elevating System a. b. c. d. e. f. g. h. MAIN ACCUMULATOR AND POWER PACK ASSEMBLY. The main accumulator (1) and power pack assembly (2) provide hydraulic power to cab components through a network of hydraulic lines and control valves. SELECTOR VALVE ASSEMBLY AND SOLENOID. The selector valve assembly (3) and solenoid (4) direct hydraulic flow from either the gunner’s control assembly (5) or assistant gunner’s control assembly (6) to the equilibrated elevating cylinder (7). GUNNER’S CONTROL ASSEMBLY. The gunner’s control assembly (5) receives hydraulic power from power pack assembly (2) to elevate or depress the cannon and traverses cab left or right. ASSISTANT GUNNER’S CONTROL ASSEMBLY. The assistant gunner’s control assembly (6) receives hydraulic power from the power pack assembly (2) to elevate or depress cannon. MANUAL ELEVATING HAND PUMP. The manual elevating hand pump (8) directs hydraulic flow to elevate and depress cannon manually. MANUAL ELEVATION ACCUMULATOR. The manual elevation accumulator (9) maintains hydraulic fluid in manual elevating hand pump (8) under minimum pressure to permit manual control of cannon elevation and depression. EQUILIBRATED ELEVATING CYLINDER. The equilibrated elevating cylinder (7) elevates, depresses, and balances cannon, as well as compensates for uneven distribution of weight of cannon tube. Other components of equilibration system are the primary accumulator assembly (10), secondary accumulator assembly (11), equilibration manifold assembly (12), and manual elevating hand pump (8). GUNNER’S SELECTOR SWITCH BOX ASSEMBLY. The gunner’s selector switch box assembly (13) ELEVATION CONTROL switch allows either the gunner or assistant gunner to elevate the cab while the CAB POWER switch is to ON. 1-37