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.
Power & Performance Those special qualities that separate one land system design from another. Performance specifications presented assume optimal operating conditions for the HEMTT M977A4 Heavy-class Military Vehicle.
1 x Caterpillar C15 6-cylinder inline liquid-cooled diesel-fueled engine developing 515 horsepower to conventional 8x8 all-wheel arrangement. Installed Power
62 mph 100 kph Road Speed
301 miles 485 km Range
Structure The physical qualities of the HEMTT M977A4 Heavy-class Military Vehicle.
2 (MANNED) Crew
34.1 ft 10.4 meters O/A Length
9.8 ft 3 meters O/A Width
7.9 ft 2.4 meters O/A Height
44,092 lb 20,000 kg | 22.0 tons Weight
Variants Notable series variants as part of the HEMTT (Heavy Expanded Mobility Tactical Truck) family line.
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.
Operators Global customers who have evaluated and/or operated the HEMTT (Heavy Expanded Mobility Tactical Truck). Nations are displayed by flag, each linked to their respective national land systems listing.
Total Production: 36,000 Units Contractor(s): 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 ]
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Image from the U.S. DoD DVIDS imagery database; Public Release.
Going Further... The HEMTT (Heavy Expanded Mobility Tactical Truck) Heavy-class Military Vehicle appears in the following collections:
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