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 TM 9-2320-303-24-1
THEORY OF OPERATION
INTRODUCTION
0003 00
1.
The M915A4 vehicles consist of twelve functional systems: drive train, fuel system, exhaust system, cooling system,
electrical system, air system, brakes, steering, air conditioning, collision warning system, traction control system, and
suspension system.
2.
This section explains the overall operation of these systems.
DRIVE TRAIN
0003 00
The drive train of the M915A4 consists of a Cummins NTC-400 engine and an Allison 4-speed (or 5-speed, if equipped)
automatic transmission connected to Rockwell SQHP rear tandem axles.
a.
Information on the principles of operation for the NTC-400 engine are found in TM 9-2815-225-34&P.
b.
The principles of operation of the transmission are contained in Allison Transmission, Principles of Operation
Manual SA2454B.
ENGINE
REAR-
REAR AXLE
FORWARD-
REAR AXLE
TRANSMISSION
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