Aircraft / Aviation Vehicles & Artillery Small Arms Warships & Submarines Military Ranks Military Pay Chart (2024) Special Forces
Land Systems / Battlefield

HEMTT (Heavy Expanded Mobility Tactical Truck)

Heavy-class Military Vehicle [ 1982 ]

The HEMTT was an American military introduction of the late-Cold War period and still serves the various branches today.

Authored By: Staff Writer | Last Edited: 02/15/2023 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

The HEMTT (Heavy Expanded Mobility Tactical Truck) is a tactical-level, heavy-class 8x8 all-wheel truck operated in considerable numbers by the United States land forces and its global allies. Design work on the type was handled by Oshkosh Corporation in 1981 and serial production began thereafter in 1982. Since then, the HEMTT has been featured in many of the major and minor military commitments by U.S. forces as well as its allies where the truck has seen export to players from Bahrain, Brazil, Egypt, and Greece to Israel, Taiwan, Turkey, and Ukraine. In the current American military inventory, the service fields over 27,000 HEMTTs in all its varied forms. These encompass new-build as well as refurbished /remanufactured trucks in the fleet.

The HEMTT was selected to succeed an aging stock of M520 "Goer" trucks in same role.

The current-generation chassis in play is the "A4". This vehicle has a base weight of 42,500lb, an overall length of 34 feet, a beam of 7.9 feet, and a height of 9.8 feet. The standard operating crew is two though this depends on role. Power is from a Caterpillar 6-cylinder inline liquid-cooled diesel-fueled engine of 515 horsepower driving the 8x8 all-wheel arrangement. This is mated to an Allison 4500SP 5-speed transmission system with 2-speed transfer case. The chassis is suspended by a Holland ADS-240 air arrangement at front and an AD-246 air arrangement at rear. Steering is power-assisted at the front tandem setup. The vehicle can haul upwards of 10 tons (short).

All told, the truck can reach road speeds of 62 miles-per-hour under clean conditions and range out to 300 miles on internal fuel.

An unarmored and armored cab (via add-on kit) can be featured depending on battlefield risk factors.

The M977 designation marks general cargo trucks built on the A0, A2, and A4 chassis. This also covers the Electrical Power Plant (EPP) generator-carrying sub-variant supporting the Patriot missile battery. The M978 is a fuel-or-water tanker support vehicle. The M983 is the tractor system used in the Patriot missile battery.

M984 covers wrecker types for vehicle recovery and thus sports a heavy-duty winch and crane. The M985 is both a cargo variant and a missile carrier (reloads for M270 MLRS or Patriot). The M1120 LHS fitting the Multilift Mk.5 Load Handling System. The M1977 CBT is the Common Bridge Transporter form (Ribbon Bridge) type. The M1142 TFFT designates the Tactical Fire-Fighting Truck model and the M1158 HEWATT is its support vehicle. The M1075 is part of the Terminal High-Altitude Area Defense (THAAD) missile network.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Oshkosh Defense / Oshkosh Corporation - USA
Bahrain; Brazil; Egypt; Greece; Iraq; Israel; Jordan; Kuwait; Malaysia; Morocco; Oman; Romania; Qatar; Saudi Arabia; South Korea; Taiwan; Turkey; United Arab Emirates; United States; Ukraine
Operators National flag of Bahrain National flag of Brazil National flag of Egypt National flag of Greece National flag of Iraq National flag of Israel National flag of Jordan National flag of Kuwait National flag of Malaysia National flag of Morocco National flag of Oman National flag of Qatar National flag of Romania National flag of the Kingdom of Saudi Arabia National flag of South Korea National flag of Taiwan National flag of Turkey National flag of Ukraine National flag of the United Arab Emirates National flag of the United States
Service Year
United States
National Origin
Project Status

Onboard systems provide solutions to accomplish a variety of battlefield engineering tasks.
General utility-minded design to accomplish a variety of battlefield tasks, typically in a non-direct-combat fashion.
Special purpose design developed to accomplish an equally-special battlefield role or roles.

Wheeled arrangement gives this system an inherent road-running capability, enhancing mobility particularly on paved roads.
Design includes such features as a track-link system or high ground clearance to better traverse offroad.
Crew is provided (either as standard or optional) protection against Chemical-Biological-Radiological-Nuclear agents for enhanced survivability in contaminated zones.
Crew has access to night-vision equipment, allowing for low-light or night time operations.
Vehicle's proven running gear and overall makeup lends itself well to fulfill other battlefield roles by way of specialized designs.

34.1 ft
(10.4 meters)
9.8 ft
(3 meters)
7.9 ft
(2.4 meters)
44,092 lb
(20,000 kg)
22.0 tons

1 x Caterpillar C15 6-cylinder inline liquid-cooled diesel-fueled engine developing 515 horsepower to conventional 8x8 all-wheel arrangement.
Drive System
1 x Allison 4500SP 5-speed automatic transmission system.
62 mph
(100 kph)
Road Speed
301 miles
(485 km)
Road Range

Not applicable.

HEMTT - Base Series Name.
HEMTTA0 - Original configuration.
HEMTTA1 - Subsequent configuration.
HEMTTA3 - Diesel-electric hybrid drive.
HEMTTA4 - Modern configuration.
M977 - Cargo variant.
M978 - Tanker variant.
M983 - Patriot SAM tractor / mover.
M984 - Wrecker variant.
M985 - Cargo variant; M270 MLRS support vehicle.
M985 GMT - Guided-Missile Transporter variant.
M1120 LHS - Load Handling System variant.
M1977 CBT - Common Bridge Transport.
M1142 - TFFT - Tactical Fire-Fighting Truck.
M1158 HEWATT - TFFT support vehicle.
M1075 THAAD - Terminal High-Altitude Area Defense missile launcher carrier.

Military lapel ribbon for the American Civil War
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of the Bulge
Military lapel ribbon for the Battle of Kursk
Military lapel ribbon for the Cold War
Military lapel ribbon for the Falklands War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Ukranian-Russian War
Military lapel ribbon for the Vietnam War
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental military vehicles


1 / 1
Image of the HEMTT (Heavy Expanded Mobility Tactical Truck)
Image from the U.S. DoD DVIDS imagery database; Public Release.

Disclaimer | Privacy Policy | Cookies

2024 Military Pay Chart Military Ranks DoD Dictionary Conversion Calculators Military Alphabet Code Military Map Symbols

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com. No A.I. was used in the generation of this content; site is 100% curated by humans.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world, WDMMA.org (World Directory of Modern Military Aircraft), WDMMW.org (World Directory of Modern Military Warships), SR71blackbird.org, detailing the history of the world's most iconic spyplane, and MilitaryRibbons.info, cataloguing military medals and ribbons. Special Interest: RailRoad Junction, the locomotive encyclopedia.

©2023 www.MilitaryFactory.com • All Rights Reserved • Content ©2003-2023 (20yrs)