TM 9-2350-287-20-1Section III. PRINCIPLES OF OPERATION1-16. EQUIPMENT OPERATION.The M992A1 requires the integrated performance of several systems to successfully complete its mission. The electricalsupply and track and suspension systems are powered by the powerpack. The auxiliary power unit provides power to thehydraulic system.POWERPACKThe powerpack includes the main diesel engine and the unitized transmission and transfer assembly.The geared transfer assembly transfers engine power to the transmission. The transmission transfers power through theleft and right final drives to the drive sprockets.The powerpack is removed and installed as a single unit. It must be removed from the vehicle before the engine andtransmission unit can be separated.The engine is a Detroit Diesel turbocharged eight-cylinder, V-type, two-cycle diesel.The Allison model XTG411-4 cross-drive transmission combines transmission, steering, and braking. The driver'scompartment steering wheel is connected through linkages to hydraulic controls in the transmission. Braking is controlledby the service brake pedal through linkages to disks in the transmission.Change 1 1-17
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