Heavy Equipment Transport System
|M1070 Heavy Equipment Transporter|
M1070 Heavy Equipment Transporter.
|Place of origin||United States of America|
|Wars||Operation Iraqi Freedom, Operation Enduring Freedom, Operation New Dawn|
|Length||30 feet 2 inches|
|Width||8 feet 6 inches|
|Height||12 feet 1 inch|
|Engine||Detroit Diesel Series 92 8V92
|425 miles, 1.7 mpg|
The Heavy Equipment Transport System (abbreviated as HET) is a military logistics vehicle transport system consisting of an 8×8 M1070 tractor and M1000 semi-trailer. It is used to transport, deploy, and evacuate tanks, armored personnel carriers, self-propelled artillery, armored bulldozers and other heavy vehicles.
In 1993 the U.S. Army started fielding the 8×8 M1070 Truck Tractor and the M1000 Heavy Equipment Transporter Semi-trailer. The tractor is produced by Oshkosh Corporation, and the trailer is manufactured by DRS Technologies.
HET transports can haul up to 70 tons – primarily Abrams tanks - but is also used for other large military equipment such as forklifts and various tracked vehicles. It is capable of operating on highways (with permits), secondary roads, and cross-country. The M1070 features a number of significant improvements over its precursor M911 which enhance the mobility and overall performance of the system in a tactical environment: among them are front- and rear-axle steering, a Central Tire Inflation System, and cab space for two HET operators and four tank crewmen. The M1000 semi-trailer has automatically steerable axles and a load-leveling hydraulic suspension. It is air-transportable by both C-5 Galaxy and C-17 Globemaster III aircraft.
Over 2,600 M1070s have been supplied to the US Army in various engine configurations, including the 1070E and the 1070E1. The 2013 M1070A1A variant features a 700 horsepower Caterpillar C18 engine which provides 200 more horsepower than the original model. A single-speed transfer case eliminates the need to stop and shift for operation on grades.
|M1070 tractor||M1000 trailer|
|Length:||30 feet 2 inches (9.19 m)||51 feet 10 inches (15.80 m)|
|Width:||8 feet 6 inches (2.59 m)||12 feet (3.7 m)|
|Height:||12 feet 1 inch (3.68 m)|
|Weight:||41,000 pounds (19,000 kg)||50,000 pounds (23,000 kg)|
|Speed:||40-45 mph||45 mph|
|Fuel:||150 Gallons in the driver-side tank, 100 Gallons in the passenger-side tank|
|Payload:||140,000 pounds (64,000 kg)|
|Engine:||500 horsepower Detroit Diesel Series 92 8V92||N/A|
|Transmission:||Allison CLT-755 5-speed automatic with TC-496 torque converter|
|Curb Weight:||45,500 lbs. (20638 kg)|
|Fifth Wheel Vertical Load:||46,000 lbs. (20865 kg)|
|Maximum Speed:||50 mph (80 km/h)|
|Engine:||Caterpillar® C18, 700 hp 18.1 L|
|Transmission:||Allison® 4800 SP/7-speed automatic|
|Transfer Case:||Oshkosh® 30000 Series/single speed|
Previous heavy equipment transports
M25 Tank Transporter
|M25 Tank Transporter|
|Place of origin||United States|
|Wars||World War II|
|Designer||Knuckey Truck Company|
|Manufacturer||Pacific Car & Foundry Co.|
|Armor||front 3/4 inch
sides, rear 1/4 inch
|.50 cal M2 machine gun|
|Engine||Type 440 6-cylinder gasoline engine
|Speed||26 mph (42 km/h)|
Nicknamed the Dragon Wagon, the M25 was composed of a 6×6 armored tractor (M26) and 40-ton trailer (M15).
In 1942 a new 40 ton semi-trailer tank transporter was required. This was to offer better off-road performance than the M9 24-small-wheel trailer, and greater capacity than the 30 ton 8-large-wheel Shelvoke and Drewry semi-trailers, then in use with the Diamond T tractor unit. This new trailer was designed by the Fruehauf Trailer Company (based in Detroit, MI). A new tractor unit was required, as this heavier trailer was more than the Diamond T could cope with.
The M26 tractor was designed by the San Francisco-based Knuckey Truck Company. When Knuckey's production capacity proved insufficient the Army awarded production to the Pacific Car & Foundry Co. of Seattle, Washington.
Designated TR-1 by Pacific Car, the 12-ton 6×6 M26 tractor was powered by a Type 440 240 bhp 6-cylinder gasoline engine developed exclusively for it by Hall-Scott (although also used to uprate the Diamond T). Some 2,100 Type 440s were built.[clarification needed] Baxter notes "over 1,300" M26 and M26A1 being built.
Unusually, the tractor unit was fitted with both an armored cab and two winches with a combined pull of 60 tons. The intention was that as well as hauling the tank transporter semi-trailer, the tractor unit could itself be used for battlefield light recovery work.
The M26 entered service with the US Army in Europe in 1944-45.
- Armament 1-.50 cal. machine gun
- Armor, front-3/4", sides, rear, 1/4".
- top speed-26 MPH
- fuel cap, 120 GAL.
M746/M747 - M911/M747
Prior to 1993, the U.S. Army employed the Commercial Heavy Equipment Transporter (C-HET), which consisted of either the M746 or the M911 truck tractor and the M747 semitrailer.
- The M746 was an 8×8 22 1/2 ton tractor built by Ward LaFrance from 1975 to 1977. Approximately 125-185 were built.
During Operations Desert Shield and Desert Storm the M911 vehicles were employed primarily to haul M1 Abrams tanks. However, they demonstrated poor durability when loads exceeded 60 tons. Some are still serving as heavy transports of other military equipment, such as cargo handling equipment.
|M911 tractor||M746 tractor||M747 trailer|
|Length:||30 feet||27 feet||48.2 feet|
|Width:||9.5 feet||10 feet||11.5 feet|
|Height:||11.8 feet||10 feet||6.8 feet|
|Weight:||26.3 tons||25.8 tons||17.1 tons|
|Speed:||43 miles per hour||38 miles per hour||N/A|
|Range:||614 miles||200 miles||N/A|
|Engine:||430 hp Detroit Diesel Series 92 (8V92TA)||12 cyl Detroit Diesel 12V71T, 600bhp @ 2500 rpm|
- Project Details of the Oshkosh 1070F
- US Army Fact File M1070 Heavy Equipment Transporter
- Oshkosh Corporation Website
- Oshkosh Corporation Defense Website