M977 Series HEMTT 8×8 Truck TM 9-2320-279-34-1 Direct Support & General Support Maintenance Manual Volume 1

Description

M977 Series HEMTT TM 9-2320-279-34-1 Direct Support & General Support Maintenance Manual Volume 1

This is Volume 1 of the U.S. Army’s Direct Support and General Support Maintenance Instructions technical manual (TM 9-2320-279-34-1) for the M977 series, 8×8 Heavy Expanded Mobility Tactical Trucks (HEMTT). Originally published in June 1987 and updated through Change 7 (1 July 2005), this DS/GS-level manual is written for maintainers who go beyond operator-level servicing and need to actually diagnose, repair, and rebuild major HEMTT systems. If you work on the M977, M978, M983, M984, or M985 HEMTT family, this is the document that shows you how the trucks are actually built underneath the sheet metal.

File Details

• Manual type: Direct Support and General Support Maintenance Instructions, Volume 1
• Publication number: TM 9-2320-279-34-1
• Original date: June 1987; updated through Change 7, 1 July 2005
• Total pages: 781
• Language: English
• File format: PDF, instant digital download
• Distribution: Approved for public release, distribution unlimited

Vehicles Covered by This HEMTT Maintenance Manual

The TM 9-2320-279-34-1 manual applies across the full M977 series HEMTT family, and the National Stock Numbers for each configuration are printed right on the manual’s title pages, so there’s no guessing about fitment:

• M977, M977A2, M977A2R1 – Cargo Truck, with and without winch
• M978, M978A2, M978A2R1 – Tank Truck, Fuel, with and without winch
• M983, M983A2, M983A2R1 – Tractor Truck, with winch, with and without crane
• M984, M984A1, M984A2, M984A2R1 – Wrecker-Recovery Truck
• M985, M985A2, M985A2R1, M985E1 – Cargo Truck, with and without winch

Because one manual spans this entire family, a technician working on any HEMTT variant in the fleet – cargo hauler, tanker, tractor, or wrecker – can pull the same TM 9-2320-279-34-1 and find the shared DS/GS procedures that apply to their specific truck.

Chapters Covered in This HEMTT Direct Support Manual

• Chapter 1 – Introduction: scope, vehicle description, nomenclature cross-reference, significant hazards and safety recommendations
• Chapter 2 – Maintenance Instructions: common tools and equipment, special tools, test equipment, repair parts, troubleshooting instructions and symptom indexes, general maintenance and lubrication instructions
• Chapter 3 – Engine Maintenance
• Chapter 4 – Fuel System Maintenance
• Chapter 5 – Cooling System Maintenance
• Chapter 6 – Electrical System Maintenance: Introduction; Alternator and Starter; Crane System Electrical; Wiring Harnesses
• Chapter 7 – Transmission Maintenance: Introduction; Service and Inspection; Shift Tower; Transmission Assembly; Oil Pan and Internal Oil Filter; Gear Unit and Main Shaft; Clutch Assemblies
• Chapter 8 – Transfer Case Maintenance
• Chapter 9 – Axles No. 1 and No. 2 Maintenance
• Chapter 11 – Brake System Maintenance: Introduction; Service Brakes; Air Brake System; Air Compressor; Trailer Brake System
• Chapter 12 – Steering System Maintenance: Introduction; Steering Linkage and Gearbox; Steering Gear and Slave; Steering Pump
• Chapter 13 – Frame Maintenance: Introduction; Frame Assembly; Fifth Wheel Assembly
• Chapter 19 – Power Takeoff (PTO) and Hydraulic Pump Maintenance: Introduction; PTO; Hydraulic Pump
• Chapter 20 – Hydraulic System Maintenance: Introduction; Hydraulic Hand Pump; Hydraulic Control Valve
• Chapter 21 – Arctic Heater Kit Maintenance: Introduction; Arctic Heater Kit
• Chapter 22 – M978 Tanker Maintenance (dedicated sections for the fuel tank truck configuration)
• Chapter 23 – additional DS/GS maintenance sections
• Appendixes – including special tool listings (with part numbers), and wiring/fold-out diagrams
• List of Illustrations, List of Tables, and a full Alphabetical Index

Across these chapters, TM 9-2320-279-34-1 walks a Direct Support or General Support mechanic through the drivetrain, electrical, transmission, axle, brake, steering, frame, hydraulic, PTO, and crane-electrical systems shared across the HEMTT family, plus the fuel tanker-specific procedures unique to the M978. The troubleshooting section is built around dual symptom indexes – one by fault symptom, one by subject/symptom – each pointing to malfunction, test/inspection, and corrective action tables so a technician can move from a reported problem straight to a fix.

Who This M977 HEMTT Manual Is For

This TM 9-2320-279-34-1 Direct Support and General Support Maintenance Manual is built for military mechanics, DS/GS maintenance shops, and serious HEMTT owners and restorers who need shop-level depth rather than operator basics. If your day-to-day work involves troubleshooting an alternator or crane electrical fault, rebuilding a transmission assembly, servicing an axle, or tearing into the frame or fifth wheel assembly on an M977, M978, M983, M984, or M985, this manual gives you the step-by-step DS/GS procedures the Army wrote for exactly that job.

IMAGES PREVIEW

Why Choose This HEMTT Maintenance Manual

With this M977 series HEMTT TM 9-2320-279-34-1 manual in hand, you can troubleshoot electrical, transmission, brake, steering, and hydraulic faults using the same malfunction-to-corrective-action tables issued to Army maintainers, correctly diagnose and repair the alternator, starter, crane electrical system, and wiring harnesses on Chapter 6 procedures, service and rebuild the transmission assembly, transfer case, and both axles following the exact torque and assembly sequences in the manual, and work through frame, fifth wheel, steering, PTO, hydraulic pump, and arctic heater kit maintenance without guessing at procedures. Following the manufacturer-issued DS/GS steps means fewer comebacks, correctly torqued fasteners, and repairs that hold up the way the original technical data intended – a real advantage over generic aftermarket guides on a specialized 8×8 tactical truck like the HEMTT. This M977 Series HEMTT Direct Support and General Support Maintenance Manual downloads instantly as a PDF after purchase – no shipping, no waiting. Read it on your phone, tablet, laptop, or shop computer, or print out the pages you need for the bay. It’s yours to keep and reference every time you’re back under an M977, M978, M983, M984, or M985.