TM-9-2320-272-24-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4
JUNE 1998
TM-9-2320-272-24-2 - Page 683 of 991
TM 9-2320-272-24-2
CHAPTER 4
DIRECT SUPPORT (DS) MAINTENANCE
Section I.
Section II.
Section III.
Section IV.
Section V.
Section VI.
Section VII.
Section VIII.
Section IX.
Section X.
Section XI.
Section XII.
Section XIII.
Section XIV.
Section XV.
Section XVI.
Direct. Support (DS) and General Support (GS)
Mechanical Troubleshooting (page 4-1)
Power Plant Maintenance (page 4-35)
Engine Maintenance (M939/A1) (page 4-117)
Engine Maintenance (M939A2) (page 4-271)
Cooling System Maintenance (page 4-352)
Electrical System Maintenance (page 4-388)
Transmission Maintenance (page 4-465)
Transfer Case Maintenance (page 4-504)
Front and Rear Axle Maintenance (page 4-548)
Compressed Air and Brake System Maintenance (page 4-584)
Power Steering System Maintenance (page 4-605)
Frame Maintenance (page 4-680)
Body, Cab, and Hood Maintenance (page 4-691)
Special Purpose Bodies Maintenance (page 4-715)
Winch, Hoist, and Power Takeoff Maintenance (page 4-808)
Special Purpose Kits Maintenance (page 4-1002)
4-1. GENERAL
This section provides troubleshooting and maintenance instructions for maintaining M939, M939A1, and
M939A2 series vehicles at the Direct Support (DS) maintenance level. A description of the differences
between models can be found in chapter 1 of TM 9-2320-272-24-1. Procedures found in this chapter pertain
to all models within a vehicle series unless otherwise designated.
Section I. DIRECT SUPPORT (DS) AND
GENERAL SUPPORT (GS) MECHANICAL TROUBLESHOOTING
4-2. SCOPE
a.
This section provides diagnostic and corrective procedures for the mechanical system at the Direct
Support (DS) maintenance level. These procedures cannot give all the answers or correct all vehicle
malfunctions encountered. However, these procedures are an organized step-by-step approach to a problem
that will direct tests and inspections toward the source of a problem and successful solution.
Information in this section is for use in conjunction with, and as a supplement to, troubleshooting
procedures found in TM 9-2320-272-24-1.
b.
Do the easiest things first. Most problems are easily corrected.
c.
Doublecheck before disassembly. The source of most problems can be traced to more than one part
in a system.
d.
Before attempting to correct a problem, diagnose the cause of the problem. Do not allow the same
failure to occur again.
e.
The following index will help you find specific problems and solutions in table 4-1, Mechanical
Troubleshooting.
4-1
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