TM 9-2320-279-10-1
Change 8
1-1
CHAPTER 1
INTRODUCTION
Contents
Para Page
Scope
1-1
1-1
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Maintenance Forms and Records
1-2
1-10
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Improvement Report and Maintenance Digest
(EIR MD) and Equipment Improvement Report and
Maintenance Summary (EIR MS)
1-3
1-10
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Hand Receipt (HR) Manuals
1-4
1-11
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Submitting Quality Deficiency Reports (QDR)
1-5
1-11
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Warranty Information
1-6
1-11
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Metric System
1-7
1-11
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Reference Information
1-8
1-12
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Equipment Characteristics, Capabilities, and Features
1-9
1-13
. . . . . . . .
Location and Description of Major Components
1-10
1-14
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Differences Between Models
1-11
1-22
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Equipment Data
1-12
1-23
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Systems Introduction
1-13
1-32
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Electrical System
1-14
1-32
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Air System
1-15
1-34
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Hydraulic System (All models except M984E1)
1-16
1-36
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Main Hydraulic System (M984E1)
1-17
1-37
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Power Steering Hydraulic System
1-18
1-38
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Section I. GENERAL INFORMATION
Vehicle Models
1-1. SCOPE. This manual is used for operation and operator-performed
maintenance of the 60,000-lb (27 240 kg) GVWR, 8x8, M977 series, Heavy
Expanded Mobility Tactical Truck (HEMTT). The M977 series vehicles consists of
a number of different models all built on similar chassis but specially equipped to
perform different missions. The models are as follows:
Model
Description
M977
Cargo vehicle with 62,000-lb (28 100 kg) GVWR and 100,000-lb
(45 400 kg) GCWR. Vehicle is equipped with material handling crane
with 2500-lb (1 135 kg) load capacity at 19 ft (5.8 m) boom radius and
has 18-foot cargo body (fig. 1-1).
M978
Tanker vehicle with 2500-gal (9 463 L) tank and fuel resupply module
(fig. 1-2).
M983
Tractor vehicle with 100,000-lb (45 400 kg) GCWR. Vehicle is equipped
with fifth wheel and 3 1/2-inch kingpin.
