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.

Image from the U.S. DoD DVIDS imagery database; Public Release.

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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

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Specifications

Service Year

1982

Origin

United States

Status

ACTIVE
In Active Service.

Crew

2
CREWMEN

Production

36,000
UNITS

Oshkosh Defense / Oshkosh Corporation - USA

(View other Vehicle-Related Manufacturers)

National flag of the Kingdom of Saudi Arabia

National flag of the United Arab Emirates

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 list includes past, present, and future operators when applicable)

✓ Engineering
Onboard systems provide solutions to accomplish a variety of battlefield engineering tasks.

✓ Utility
General utility-minded design to accomplish a variety of battlefield tasks, typically in a non-direct-combat fashion.

✓ Special Purpose
Special purpose design developed to accomplish an equally-special battlefield role or roles.

Wheeled Arrangement

Wheeled arrangement gives this system an inherent road-running capability, enhancing mobility.

Cross-Country Capability

Design includes such features as a track-link system or high ground clearance to better traverse offroad.

NBC Protection

Crew is provided (either as standard or optional) protection against Nuclear-Biological-Chemical agents for enhanced survivability in contaminated zones.

Nightvision

Crew has access to night-vision equipment, allowing for low-light or night time operations.

Versatility

Vehicle's proven running gear and overall makeup lends itself well to fulfill other battlefield roles by way of specialized designs.

Length

34.1 ft
10.4 m

Width

9.8 ft
3 m

Height

7.9 ft
2.4 m

Weight

44,092 lb
20,000 kg

Tonnage

22.0 tons
MEDIUM

(Showcased structural values pertain to the HEMTT M977A4 production variant. Length typically includes main gun in forward position if applicable to the design)

Powerplant: 1 x Caterpillar C15 6-cylinder inline liquid-cooled diesel-fueled engine developing 515 horsepower to conventional 8x8 all-wheel arrangement.

Transmission: 1 x Allison 4500SP 5-speed automatic transmission system.

Speed

62.1 mph
(100.0 kph)

Range

301.4 mi
(485.0 km)

(Showcased performance specifications pertain to the HEMTT M977A4 production variant. Compare this entry against any other in our database)

None.

Not applicable.

HEMTT - Base Series Name.

HEMTTA0 - Original configuration.

HEMTTA1 - Subsequent configuration.

HEMTTA3 - Diesel-electric hybrid drive.