TM-9-2320-279-20-1
M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)
TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3
TM-9-2320-279-20-1 - Page 22 of 985
TM 9-2320-279-20-1
crane and TM 9-2320-355-24&P provides additional unique maintenance instructions for the M985E1
with
HIAB 8108 crane. Listed below are some of the special features which have been put in to help locate and
use needed information.
• The front cover index provides a quick reference to chapters and sections that will be used often.
• The appendixes are located at the end of the manual. They contain a reference guide to other
manuals, guidelines to reading the Maintenance Allocation Chart (MAC), a list of expendable supplies
and materials, towing procedures, and torque values.
• Subject headings and certain other essential information are printed in bold type throughout the
manual to make them more visible.
Ž The maintenance tasks describe what must be done to the vehicle before starting the task, and what
must be done to return the vehicle to operating condition after the task is finished.
The manual is divided into chapters containing organizational maintenance procedures. These procedures
describe a number of things such as:
What will be needed to do the job.
If any assistance will be needed.
How long the job will take.
Important safety precautions.
In addition to the text, there will be an exploded-view illustration of most steps. This illustration is keyed
to the text and shows you how to take the part off and put it on. Cleaning and inspection procedures are
also included when required. The following problem will describe some of the features of this manual.
PROBLE M
The vehicle operator brings vehicle into the shop with a problem. Whenever the vehicle is started, the
green needle on the air pressure gage stays below 60 psi (414 kPa) for a long time, but the red needle
reaches 120 psi (827 kPa) in about two minutes.
1. How do you start ?
Look at the cover of the manual .
On the cover is a listing of different sections in the manual. It will be necessary to troubleshoot the
problem to find the cause, so the Troubleshooting section will be needed. Open the manual to the
page stated on the cover, or to find the Troubleshooting section fast, bend the pages slightly and
line up the troubleshooting block on the cover with the black tab on the pages. The manual will be
opened to Section V of Chapter 2, Troubleshooting.
2. What kind of problem is it ?
Find it
in
the symptom index .
There are two symptom indexes in the Troubleshooting section. One is arranged alphabetically by
system symptom
and the other is arranged alphabetically by
subject/symptom.
The symptom
causing the problem might be in the System Symptom Index under Air System, Dual Air Brake
System, or Electrical System. In the Subject/Symptom Index, it might be under Air, Brakes, or
Pressure. When the symptom to the problem is found, go to the troubleshooting procedure page
listed for that symptom.
3. How can the cause of the problem be determined ?
Go to page 2-93 .
Troubleshooting for NOISY COMPRESSOR OPERATION is on that page. The troubleshooting
procedures have columns with the headings: MALFUNCTION, TEST OR INSPECTION, and
CORRECTIVE ACTION. Starting at step 1, read the procedure. Each step describes what to do and
what to look for. Follow the steps, in order, to troubleshoot the symptom until the problem is
found. When the problem is found, the CORRECTIVE ACTION column will describe how to fix it.
4. Let’s assume it was determined that the air compressor is bad. The replacement is i n
paragraph 11-38 .
The procedure contains all the information needed to replace the air compressor. First check the
introductory material. It tells what will be needed before starting the job. Following the
introductory material is an exploded-view illustration and step-by-step instructions which show
how to remove and install the air compressor.
FOLLOW THESE GUIDELINES WHEN USING THIS MANUAL:
•Become familiar with the entire maintenance procedure before beginning a maintenance task.
. •Read all WARNINGS and CAUTIONS before performing any procedures.
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