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 9 of 1015
TM 9-2320-272-24-l
HOW TO USE THIS MANUAL
ABOUT
YOUR
MANUAL
Spend some time looking through this manual. You’ll find that it has a new look, different than most
TMs you’ve been using, including its predecessors, TM 9-2320-272-20-1, TM 9-2320-272-20-2,
TM 9-2320-272-34-1, TM 9-2320-272-34-2, and TM 9-2320-358-24&P.
New features added to improve the convenience of this manual and increase your efficiency are:
a.
Accessing Information
- These include physical entry features such as the bleed-to-edge
indicators on the cover and edge of the manual. Extensive troubleshooting guides for specific
systems lead directly to step-by-step directions for problem solving and maintenance tasks.
b.
Illustrations
-A variety of methods are used to make locating and fixing components much easier.
Locator illustrations with keyed text, exploded views, and cut-away diagrams make the information
in this manual easier to understand and follow.
c.
Commonality
- Only items that are unique to a specific series or vehicle will be given a separate
procedure. When only minor differences occur, notes are added to tell you to alter the normal
procedure in one way or another to accommodate the differences.
d.
Keying Text with Illustrations
- Instructions/text are located together with illustrations of the
specific task you are performing. In most cases, the task steps and illustrations are located on
facing pages, with text on the left and illustrations on the right. Continue reading for an example of
modular text and illustration layout,
HOW TO USE THIS MANUAL
Here’s an example of how to use your manual:
Task:
The unit maintenance mechanic of an M939 series vehicle reports that the engine cranks but fails to
start.
Troubleshooting steps:
1.
Look at the cover of this manual. You’ll see subjects listed from top to bottom on the right-hand side.
2.
Look at the right edge of the manual. On some of the pages you’ll see black bars (edge indicators)
that
are aligned with the subject bars on the cover. These are the locations of the subjects in the
manual.
3.
Look for UNIT TROUBLESHOOTING in the subject list on the cover,
4.
Turn to the page with the edge indicator matching the subject bar for UNIT TROUBLESHOOTING.
Page numbers are also listed next to the subject titles.
5.
An edge indicator is placed on the first page of the UNIT TROUBLESHOOTING.
NOTE
If the first page of a subject has an even-numbered page, it will
appear on your left, but the edge indicator will still be on the page to
your right. So, if the information you are looking for does not start on
the page to your right, it will on the page to your left.
6.
Look down the list until you find ENGINE. Beneath that heading you will find the symptoms noted
by the maintenance mechanic: Engine cranks, fails to start.
7.
Turn to the page indicated: page 2-9.
8.
On page 2-9, steps/test relating to resolving the malfunction of “Engine cranks, fails to start,” are:
Step 1. You inspect the fuel pump shutoff valve and find it is defective and must be replaced. You
see para. 4-6 referenced.
Step 2. The rest of the inspection shows no other cause for the problem.
9.
Locate para. 4-5, and you will find the detailed procedure for removing the old fuel pump shutoff
valve and replacing it with a new one.
v
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