The Extensively Expanded Mobility Tactical Truck ( HEMTT ) is an eight-wheel, diesel-powered, 10-short-ton (9100 kg) drive, a tactical truck used by the US Military and others. In an evolving configuration, this product continued to be produced since 1982. M977 HEMTT entered service with the US Army as a replacement for the Goer M520.
As early as 2015, more than 27,000 HEMTTs in various configurations have been manufactured by Oshkosh Defense through new or remanufactured manufacture. The current variant has A4 suffix.
Replacement of Logging Channel 10H-10 Oshkosh (LVSR) is equivalent to the US Navy from Oshkosh 8ÃÆ' â € "8 HEMTT and Oshkosh 10ÃÆ'-10 US Palletized Load Systems (PLS). Marines do not use HEMTT or PLS, and the Army does not use LVSR, but both services use a general trailer (M1076) with all three types of trucks.
Video Heavy Expanded Mobility Tactical Truck
History
Following the evaluation of proposals submitted by AM General, MAN, Pacific Car & amp; Foundry (PACCAR) and Oshkosh Truck Corporation (with the PACCAR-GMC team leading the competition, with pre-production assembly lines established) in May 1981, then the US Army Automobile Tank Commander awarded a preliminary five-year contract valued US $ 251.13 million to Oshkosh Truck Corporation to produce 10-short-ton (9100 kg) 8ÃÆ' â € "8 Heavy Moved Mobility Tactical Truck (HEMTT).
The first prototype of HEMTT was completed in December 1981, a pre-production example that was followed during March 1982, with the first production vehicle produced in September 1982. Over a five-year contract totals 2,140 vehicles to be delivered. The contract options allow up to 5,351 additional HEMTTs to be ordered, bringing total production to 7,490 vehicles. Most of these options are done.
The second HEMTT contract was awarded to Oshkosh Truck Corporation in April 1987. The contract calls for a base quantity of 1,403 vehicles, with options for an additional 1,684 vehicles; all contract options are made. The additional agreement added 1,449 additional vehicles (plus option for 363 vehicles) to the second HEMTT contract in April 1989; contract options are made. The third HEMTT production contract was awarded in mid-1994 and when deliveries below produced more than 14,000 HEMTTS were produced. The fourth HEMTT production contract was awarded in August 1995, extending production to September 2001.
The Family of Heavy Tactical Vehicles (FHTV) contract was awarded to Oshkosh by the US Army in March 2001. In addition to HEMTT (both new and re-manufacturing), the contract includes M1070 HET, M1074, and M1075 Palletized Load System (PLS) trucks; M1076 PLS trailer and called for up to 5,398 trucks and 1,100 trailers (including options). FHTV covered the production period from March 2001 to mid fiscal 2006 (FY06). The FHTV contract was renewed and renegotiated, and in February 2007, Oshkosh announced it had secured a contract to continue the production of FHTV. Advanced FHTV contracts (FHTV 2) include the new production of HEMTT (including the current A4 variant from mid 2008) and PLS vehicles plus PLS trailers. In total, 2173 new-build HEMTT A4 and 104 Recap HEMTT A4 are booked under FHTV 2.
Production of A2 HEMTT product improvements continued until the production of HEMTT A4 began in July 2008. The exception was the M1977 which initially remained in the A2 configuration for fleet equality reasons. Now there is M1977A4.
Oshkosh Defense announced In October 2008 that they have been awarded the FHTV 3 contract by the US Army TACOM. More than 6,000 vehicles and trailers can be delivered under this three-year contract. FHTV 3 includes models of HEMTT A4 and A1 PLS and HET, as well as new vehicles and recapitalization (Recap). The HEMTT A4 model is required to be an appropriate Long Term Armor Strategy (LTAS) and out of assembly line equipped with enhanced suspension and composite integral armor (A-kit), and ready to receive appliqué armor add-on (B-kit) Â ©.
The first 3 FHTV orders were valued at US $ 1.2 billion and shipments commenced in November 2008. At the end of 2009 around 11,500 HEMTT A4s (new-build and recap) were booked based on FHTV 2 and 3 contracts.
Oshkosh Defense announced in 2012, that they have been awarded a bridge contract to continue production and support of FHTV. In October 2013, the US Army released a revised pre-demand notice related to FHTV 4 (presented FHTV IV). The original synopsis has been released in July 2013. According to the October release, the government intends to award a five-year terms contract with an estimated value of US $ 822 million on a single source basis for Oshkosh Corporation. It is understood the purpose of the US Army, is to ensure negotiations with Oshkosh Defense for FHTV IV are concluded in time to ensure there is no disconnection in production between the production of FHTV 3 and FHTV IV and delivery.
On June 19th, 2015 Oshkosh Defense announced that the US Army has awarded a five-year, five-year contract worth $ 780 million for the Recapitalization of Family of Heavy Tactical Vehicles (FHTV). The FHTV 4 contract covers about 1,800 FHTV and in addition to HEMTTs covering PLS trucks and also includes the production of approximately 1,000 new PLS production trailers. The HEMTT model accounts for about 75 percent of the potential for Recapitulation, and all work done under the contract will be completed in Oshkosh, Wisconsin. Delivery will take place from 2015 to 2019. In March 2016 Oshkosh received the FHTV 4 award for $ 430 million and included the 1212 HEMTT and PLS Recap, plus the production of 345 new PLS trailers. Deliveries are scheduled in 2016-2017. In April 2017 Oshkosh announced a further FHTV 4 award valued at more than $ 258 million for 630 FHTV Rekap plus 356 PLS production trailers. Delivery begins in December 2017. The latest FHTV-4 award announced by Oshkosh on May 23, 2018, is worth $ 235.2 million for 410 FHTV Recap and manufacturing of 680 new PLS trailers. Delivery starts in FY19. The total amount of HEMMT covered by this and previous FHTV 4 shipping orders is currently unknown, but since 1995 Oshkosh has recapitalized more than 13,000 HEMTT and 3,000 PLS.
Since 1995, Oshkosh has worked with the US Army to recover more than 12,000 heavy vehicles.
To be recapitalized, the vehicles used are returned to Oshkosh where they are stripped to the frame rails, and then completely rebuilt to such new condition. The recapitulation vehicle is assembled on the same production line as the new vehicle, and undergoes the same performance testing and inspection procedures as a new vehicle. Recap'd vehicles are returned to the Army with new bumper-to-bumper warranties and FHTV's latest configuration including air-conditioned taxis and ready-to-use armor, power upgrades and anti-lock brakes.
Maps Heavy Expanded Mobility Tactical Truck
Description
HEMTT's goal is to provide heavy transport capabilities to supply and re-supply combat vehicles and weapons systems. Compared to the previous generation of 5-ton trucks in the US Army service, it offers increased payload and mobility. HEMTT is available in a variety of configurations, including cargo, tankers, tractors and crushers.
HEMTT was developed from scratch as a tactical truck, but to minimize procurement costs and life cycles including military commercial automotive components if possible, these include engines and transmissions. Some of the components used in early HEMTTs are common with Oshkosh Logistics Vehicle System (LVS) vehicles that are supplied to the US Marine Corps.
With the exception of the M984 wrecker variant (254 ÃÆ'â € "89 ÃÆ'â €" 9.5 mm, front, 356 ÃÆ'â € "89 ÃÆ'â €" 9.5Ã, mm, rear), on all variants of HEMTT chassis formed from 257 ÃÆ'â € "89 ÃÆ'â € "9.5 Ã, mm carbon steel heat treated manganese with a yield strength of 758 MPa. Welded construction with bolt Grade 8 is used in all parts. A self-recovery winch mounted in the middle is an option and is suitable for about 20% of production.
Two-door HEMTT control cabin has two seats. It is a heavy duty steel welded construction with a corrosion resistant sheet metal leather. Simula Inc. (acquired by Armor Holdings in 2003 and now BAE Systems) provides 186 add-on cab armoring kits for use in the former Yugoslavia. It was not issued, but since 2004 it was used in Iraq. The BAE system provides next generation armor kits for HEMTT and by the end of 2006 has supplied the US Army with about 3600 kits for Oshkosh HEMTT and PLS. HEMTT A4 is equipped with slightly larger than Oshkosh PLS A1. This cabin complies with the requirements of the US Long-Term Fleet Strategy (LTAS) from the A-and B-kit guarding philosophy. It also comes as a standard with an integrated floor protector, an integrated mount for machine guns and shooter protection kits, and air conditioning.
A diesel Detroit Diesel 8V92TA V-8 two-stroke diesel developed 445 hp (332 kW) is installed in the HEMTT A0 and A1 models, with the DDECIV version of this engine fitted to A2 HEMTTs. An EPA 2004 compliant Caterpillar (CAT) C-15 six-cylinder, 15.2 liter diesel develops a peak of 515 hp (384 kW) installed for the HEMTT A4 model. The HEMTT A0 and A1 models are equipped with Allison HT 740D 4F/1R automatic transmissions, torque converters, and Oshkosh 55,000 pounds (25,000 kg) two speed transfer cases. The HEMTT A2 model has an Allison HD 4560P 6F/1R automatic transmission. The HEMTT A4 model is equipped with an Allison 4500SP 5F/1R automatic transmission and a directional version of 50kg (25,000kg) two-speed Oshkosh transfer case.
Front axle on all HEMTTs is a single Oshkosh 46K reduction, the back is a single reduction fund that varies according to configuration. Drive to the front as selected and all axles have differential keys. The suspension on the A0/A1/A3 model is by the Hendrickson leaf spring with the equalizing beam. Suspension on the A4 model is the Holland air suspension, the load rating on the rear axles varies by configuration. The size of the tire is 1600 R20 on all models, and the standard tire match is Michelin XZL.
All models are capable of crossing the water to a depth of 48 degrees (120 cm), and can climb at least 60%. All original variants can be transported by air in C-130. All variants can be transported by air on the C-17.
Source of the article : Wikipedia
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