TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 35 of 1015
TM 9-2320-272-24-l
Section III. PRINCIPLES OF OPERATION
1-18. GENERAL
This section explains how components of the B-ton M939/Al/A2 series vehicles work together. A functional
description of these components and their related parts will be covered in the following paragraphs. To find
the operation of a specific system or component, see the principles of operation reference index below.
1-19. PRINCIPLES OF OPERATION REFERENCE INDEX
PARA.
NO.
TITLE
PAGE
NO.
l-20.
Control System Operation
1-21.
Power System Operation
l-22.
Electrical Systems Operation
l-23.
Compressed Air and Brake System Operation
l-24.
Hydraulic System Operation
l-25.
Central Tire Inflation System (CTIS) Operation
l-25
l-34
1-45
1-55
1-71
l-78
l-20. 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:
a.
Starting and Ether Starting System Operation (page l-26).
b.
Accelerator Controls System Operation (page l-28).
c.
Parking Brake System Operation (page l-29).
d.
Steering System Operation (page l-30).
e.
Transmission Control System Operation (page l-31).
f.
Transfer Case Control System Operation (page 1-32).
1-25
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