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 2-1 OPERATOR’S CONTROLS, INDICATORS, AND INSTRUMENTS — CONTINUED 2-1.4 Crew Controls and Instruments 1 2 3 4 5 6 7 8 9 10 11 12 13 14 OPERATING HANDLE (BREECH MECHANISM) DOME LIGHT SWITCH RAMMER ACTUATING VALVE CONTROL HANDLE FIRING MECHANISM MANUAL CONTROL LEVER RAMMER HANDLE TURRET LOCK M3 ELECTRICAL AIR HEATER (M109A4/M109A5) ACCESSORY CONTROL BOX MANUAL TRAVERSE HANDWHEEL GUNNER’S CONTROL ASSEMBLY HANDLE GUNNER’S SELECTOR SWITCH BOX ASSEMBLY EQUILIBRATION HANDPUMP ASSEMBLY M145/M145A1 M117/M117A2 TELESCOPE TELESCOPE MOUNT PANORAMIC Allows breech to be opened manually. Turns dome light assembly on or off. Activates rammer actuating valve to operate rammer assem- bly. Movement drives firing hammer into firing pin causing primer to ignite. Used to move rammer in and out of ramming position. Locks cab position to prevent cab traversing. Four M3 electrical air heaters provide heated air to the gunner, cannoneer no. 1, section chief, and the assistant gunner while operating in an NBC environment. Allows gunner to control cab ventilation and heating. Permits manual traversing of cab. Allows gunner to elevate, depress, and traverse cannon as- sembly. Controls the electrical power to the cab with the CAB POWER switch, permits the selection of either power or manual travers- ing mode with the TRAVERSE CONTROL switch, and controls whether the gunner’s or assistant gunner’s control assembly will be permitted to elevate or depress the weapon with the ELEVATION CONTROL switch. Used to manually increase or decrease hydraulic fluid pres- sure. Provides an adjustable base and support for the M117/M117A2 panoramic telescope. Indirect fire instrument used in laying the weapon in azimuth. 2-10