TM-9-2320-272-23-1

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5

SEPTEMBER 2012
TM-9-2320-272-23-1

  TM-9-2320-272-23-1 - Page 206 of 1313

FIELD MAINTENANCE
THEORY OF OPERATION
GENERAL
This work package explains how components of the 5-ton M939/A1/A2 series vehicles work together. A functional
description of these components and their related parts will be covered in the following paragraphs.
CONTROL SYSTEM OPERATION
The control system includes those controls and their related parts essential to the operation of the vehicle. These
controls are common to all vehicles with the exception of the transmission and transfer case Power Takeoff (PTO)
controls. All originate from the cab. Each of these controls and related parts will be described as part of the
following
systems:
1.
Starting and Ether Starting System Operation.
2.
Accelerator Controls System Operation.
3.
Parking Brake System Operation.
4.
Steering System Operation.
5.
Transmission Control System Operation.
6.
Transfer Case Control System Operation.
TM 9-2320-272-23-1
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