Description
U.S. Military Technical Manual: HMMWV M998 Series DS/GS Maintenance
This comprehensive HMMWV M998 Series Direct Support & General Support Maintenance Manual is the official U.S. Army, Air Force, and Marine Corps technical publication (TM 9-2320-280-34 / TO 36A12-1A-2092-3 / TM 2320-34/9B) for the complete maintenance of the 1-1/4 ton, 4×4 M998 series High Mobility Multipurpose Wheeled Vehicle (HMMWV), commonly known as the Humvee. This is the direct support (DS) and general support (GS) level manual, providing in-depth diagnostic, repair, and overhaul procedures beyond the scope of unit-level maintenance.
With over 1,300 pages of detailed technical data, this manual is an essential resource for military maintenance facilities, civilian workshops, and serious off-road enthusiasts working on these iconic vehicles. It covers the full range of M998 series variants, including cargo/troop carriers, armament carriers, TOW carriers, heavy variants, and ambulance models. The manual provides step-by-step instructions for troubleshooting, repairing, rebuilding, and testing major vehicle systems and components.
File Details:
- Manual Type: Direct Support and General Support Maintenance
- Document Numbers: TM 9-2320-280-34, TO 36A12-1A-2092-3, TM 2320-34/9B
- Brand/Manufacturer: U.S. Department of the Army, Air Force, and Marine Corps
- Models Covered: M998, M998A1, M1038, M1038A1, M1097, M1097A1, M1097A2, M1123, M966, M966A1, M1121, M1036, M1045, M1045A1, M1045A2, M1046, M1046A1, M1025, M1025A1, M1025A2, M1026, M1026A1, M1043, M1043A1, M1043A2, M1044, M1044A1, M1037, M1042, M996, M996A1, M997, M997A1, M997A2, M1035, M1035A1, M1035A2
- Language: English
- Page Count: Over 1,300 pages
- File Format: PDF
- Date: Original 31 January 1996, with changes up to 15 July 2004
Chapters Covered & Maintenance Procedures
The manual is organized into detailed chapters that cover every major system of the HMMWV. It begins with essential safety warnings, general maintenance instructions, and troubleshooting guides, then progresses through system-specific maintenance tasks. Below is a breakdown of the core content:
- General Maintenance (Chapter 2): Includes troubleshooting symptom indexes for engine, transmission, transfer case, differential, brakes, and steering systems. Also covers air-conditioning troubleshooting and general maintenance instructions for cleaning, inspection, repair, and assembly.
- Engine Maintenance (Chapter 3): Covers the 6.2L and 6.5L diesel engines. Procedures include engine mount and insulator maintenance, cylinder head repair and replacement, crankshaft pulley and torsional damper replacement, rocker arm shaft and pushrod replacement, hydraulic valve lifter replacement, timing chain cover and drive sprocket maintenance, rocker arm cover maintenance, front cover oil seal replacement, oil pump drive and oil pump maintenance, intake manifold maintenance, glow plug tip removal, engine injection pump timing, and complete engine removal and installation for both 6.2L and 6.5L engines.
- Fuel System (Chapter 4): Fuel injection nozzle and line maintenance, servo advance seal replacement, fuel injection pump maintenance and cover replacement, and shutoff solenoid and cold advance solenoid maintenance.
- Cooling System (Chapter 5): Radiator and oil cooler maintenance.
- Electrical System (Chapter 6): Extensive coverage of alternator repair for 60A, 100A, and 200A models, starter repair, and replacement of engine, body, and STE/ICE-R wiring harnesses.
- Transmission (Chapters 7 & 17): Covers both the THM 400 (3L80) and 4L80-E electronic transmissions. Includes governor maintenance, oil pump seal replacement, transmission removal/installation, and detailed disassembly, repair, and assembly procedures for all major components including clutches, center support, gear units, valve bodies, and oil pumps.
- Transfer Case (Chapters 8 & 18): New Process Gear models 218 and 242. Covers replacement and full overhaul, including disassembly, cleaning, inspection, and assembly.
- Propeller Shafts, Axles, and Suspension (Chapter 9): Differential output shaft and pinion seal replacement, differential replacement, geared hub repair, control arm bushing replacement, and front propeller shaft repair.
- Brakes (Chapter 10): Service brake rotor repair, disc brake caliper repair, and rear parking brake caliper repair.
- Steering (Chapters 11 & 20): Power steering pump and gear leak test, steering gear repair, and steering alignment procedures.
- Frame (Chapters 12 & 21): Frame maintenance, including removal and installation of various brackets, crossmembers, and spring seats, along with frame inspection and repair procedures.
- Body (Chapters 13, 14, & 22): Roof, windshield, cargo shell, and support ring maintenance. Includes detailed ambulance body repair procedures and general body repair and rivet replacement.
- Special Purpose Bodies (Chapter 14): TOW and armament carrier maintenance, ambulance maintenance (including heater repair and air-conditioning system servicing for R-12 and R-134a).
- Winch (Chapter 15): Repair of 6,000 lb electric, 9,000 lb electric, and 10,500 lb hydraulic winches.
- Special Purpose Kits (Chapter 16): Arctic winterization kit maintenance.
This HMMWV M998 Series DS/GS Maintenance Manual PDF is an indispensable tool for any shop or individual tasked with the upkeep, repair, or restoration of a Humvee. It provides the official, factory-level procedures, clearances, and torque specifications required to do the job correctly. With the complete transmission and transfer case rebuild chapters, it allows for a level of maintenance that is not found in the standard unit-level manuals.
Why This Manual is a Must-Have for HMMWV Owners & Technicians
This is not a simplified owner’s manual; it is the comprehensive technical publication used by military mechanics for direct and general support maintenance. It empowers you to:
Complete PDF Bookmark Tree
Complete Bookmarks
The complete bookmarks in the “HMMWV M998 Series Direct Support & General Support Maintenance Manual – PDF” are as follows:
TABLE OF CONTENTSp. 16
LAST CHANGEp. 4
WARNINGp. 2
+CHAPTERS
CHAPTER 1p. 24
+CHAPTER 2p. 30
PARA 2-13p. 59
PARA 2-14p. 60
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+CHAPTER 3p. 63
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+CHAPTER 6p. 293
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+FIGURES
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+TABLES
TABLE 1-1p. 26
TABLE 2-1p. 33
TABLE 2-1.1p. 52
TABLE 2-2p. 53
TABLE 2-2.1p. 53
TABLE 17-1p. 840
TABLE 17-2p. 869
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TABLE 22-5p. 1096
TABLE D-1p. 1264
TABLE D-2p. 1265
TABLE F-1p. 1276
TABLE F-2p. 1276
TABLE F-3p. 1277
+APPENDICES
APPENDIX Ap. 1218
APPENDIX Bp. 1220
APPENDIX Cp. 1228
APPENDIX Dp. 1263
APPENDIX Ep. 1266
APPENDIX Fp. 1276
APPENDIX Gp. 1278
INDEXp. 1285
+PAGES
PAGE WARNING Ap. 2
PAGE WARNING Bp. 3
PAGE Ap. 12
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- Accurately Diagnose: Use the detailed troubleshooting guides to quickly identify the root cause of malfunctions in the engine, transmission, brakes, steering, and electrical systems.
- Perform Major Repairs: Undertake complex tasks such as engine overhaul, transmission rebuild, transfer case repair, and differential setup with the correct step-by-step procedures.
- Access Vital Specifications: Get all necessary technical data, including torque limits, clearances, capacities, and pressure readings, ensuring repairs are done to military standards.
- Work on All Major Variants: The manual covers the extensive M998 series family, including armored TOW and armament carriers, heavy variants, and ambulance models (M996, M997, M1035).
- Use Official Procedures: Follow the exact maintenance steps and use the correct tools as prescribed by the U.S. Department of Defense, ensuring safety and reliability.
Whether you are a military maintenance unit, a civilian automotive shop specializing in tactical vehicles, an avid off-roader, or a classic military vehicle collector, this manual provides the official, highest-level service data to keep your HMMWV in peak operating condition. It covers everything from engine and transmission overhauls to air-conditioning system servicing and frame repair.
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This manual is available as an instant PDF download. Once your payment is processed, you will receive immediate access to the complete file, allowing you to start using it on your computer, tablet, or smartphone. You can also print specific sections for use in the workshop. There is no physical product to ship, providing you with the information you need without delay.
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