TM-9-2350-274-BD M109 Battlefield Damage Assessment and Repair Download
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TM 9-2350-274-BD CHAPTER 7 POWERTRAIN/STEERING BDAR FIXES SHALL BE USED ONLY IN COMBAT AT THE DISCRETION OF THE COMMANDER AND SHALL BE REPAIRED BY STANDARD MAINTENANCE PROCEDURES AS SOON AS PRACTICABLE AFTER THE MISSION IS COMPLETED. SECTION L General 7-1. General. The M109/M110/M578 series powertrain (transmission and transfer assemblies) transmits power from the engine through the transfer assembly to the transmission input spur gear which is splined to the transmission input shaft. The input spur gear operates the driven spur gear to which the torque converter drive gear is splined. The torque converter delivers two branches of power, vehicle drive and steering. The transmission is hydro-mechanically operated and delivers power to the left and right final drive sprockets. The transmission provides four forward and two reverse speeds, and steering through a differential action. 7-2. Assessment Procedure. a. Pre-conditions: Vehicle brakes should be in working condition. The vehicle engine must run to assess the powertrain using this procedure. b. Visually inspect Damage found to: -housings . . . . . . . . . . . . . . . . . . go to TM 9-2350-276-BD No damage -drives . . . . . . . . . . . . . . . . . . . . go to para 7-7 found -linkages . . . . . . . . . . . . . . . . . . go to para 7-6 c. Start engine Damage found to: to operate; observe operation No damage -forward gears . . . . . . . . . . . . . . go to para 7-4 found -reverse gears . . . . . . . . . . . . . . . go to para 7-4 -steering capability . . . . . . . . . . . . go to para 7-6 d. Check powertrain/steering performance Change 1 7-1