| tiers | |
|---|
| categories | | "WEG" |
| "Logistics" |
| "Transportation" |
| "United States" |
| "PRO_Bahrain" |
| "PRO_Brazil" |
| "PRO_Egypt" |
| "PRO_Greece" |
| "PRO_Israel" |
| "PRO_Jordan" |
| "PRO_Kuwait" |
| "PRO_Morocco" |
| "PRO_Oman" |
| "PRO_Qatar" |
| "PRO_Russian Federation" |
| "PRO_Saudi Arabia" |
| "PRO_South Korea (Republic of Korea)" |
| "PRO_Turkey" |
| "PRO_United Arab Emirates" |
| "PRO_United States of America" |
| "Land" |
| "Tier3" |
|
|---|
| notes | "The M977 cargo truck variant is the base member of the HEMTT family. The current model is the M977A4; there was no M977A1. In addition to the basic M977A0/A2/A4 cargo truck, two other variants are available. The M977A0/A2/A4 Electrical Power Plant (EPP) has an extended cargo body (6.041 m (19.82 ft) inside length) and is used to hold and transport generators for the Patriot air-defence missile system. There is no material handling crane on the EPP. The M977A0/A2/A4 Large Repair Parts Transporter (LRPT) and the basic M977 cargo truck are fitted with a light-duty Grove materials handling crane mounted at the rear of the chassis.
The Heavy Expanded Mobility Tactical Truck (HEMTT) is an eight-wheel drive, diesel-powered, 10-short-ton (9,100 kg), tactical truck used by the US military and others. In evolving configurations, it has been in continuous production since 1982. The M977 HEMTT entered service with the U.S. Army as a replacement for the M520 Goer.
By mid 2019, around 35,000 HEMTTs in various configurations had been produced by Oshkosh Defense through new-build contracts and around 13,000 of these had been re-manufactured. Current variants have the A4 suffix.
The 10×10 Oshkosh Logistic Vehicle System Replacement (LVSR) is the U.S. Marines’ equivalent to the U.S. Army's Oshkosh 8×8 HEMTT and Oshkosh 10×10 Palletized Load System (PLS). The Marines do not use the HEMTT or PLS, and the Army does not use the LVSR, but both services use a common trailer (M1076) with all three truck types.
The HEMTT's objective is to provide heavy transport capabilities for supply and re-supply of combat vehicles and weapons systems. Compared to earlier generation 5-ton trucks in U.S. Army service it offers increased payload and mobility. The HEMTT is available in a variety of configurations, including cargo, tanker, tractor and wrecker.
The HEMTT was developed from the outset as a tactical truck, but to minimize procurement and life cycle costs included militarized commercial automotive components where possible, these including the engine and transmission. Some components used in early HEMTTs are common with the Oshkosh Logistics Vehicle System (LVS) vehicles which were supplied to the U.S. Marine Corps.
With the exception of the M984 wrecker variant (254 × 89 × 9.5 mm, front; 356 × 89 × 9.5 mm, rear), on all HEMTT variants the chassis is formed of 257 × 89 × 9.5 mm heat-treated carbon manganese steel with a yield strength of 758 MPa. Bolted construction with Grade 8 bolts is used throughout. A centrally mounted self-recovery winch is an option and this is fitted to around 20% of production.
The HEMTT's two-door forward control cab seats two. It is of heavy-duty welded steel construction with corrosion-resistant sheet metal skins. Simula Inc. (acquired by Armor Holdings in 2003 and now BAE Systems) supplied 186 add-on cab armoring kits for use in the former Yugoslavia. These were not issued, but from 2004 were used in Iraq. BAE systems supplied a next-generation armor kit for the HEMTT and by late-2006 had supplied the U.S. Army with around 3600 kits for the Oshkosh HEMTT and PLS. The HEMTT A4 is fitted with the slightly larger from the Oshkosh PLS A1. This cab complies with the U.S. Army's Long Term Armor Strategy (LTAS) requirements of an A- and B-kit armoring philosophy. It also comes as standard with integrated floor armor, an integrated mount for a machine gun and gunner protection kit, and air-conditioning.
A Detroit Diesel 8V92TA V-8 two-stroke diesel developing 445 hp (332 kW) is fitted in 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 developing a peak of 515 hp (384 kW) is fitted to HEMTT A4 models. HEMTT A0 and A1 models are fitted with an Allison HT 740D 4F/1R automatic transmission, torque converter, and Oshkosh 55,000-pound (25,000 kg) two-speed transfer case. HEMTT A2 models have the Allison HD 4560P 6F/1R automatic transmission. HEMTT A4 models are fitted with an Allison 4500SP 5F/1R automatic transmission and an uprated version of Oshkosh's 55,000-pound (25,000 kg) two-speed transfer case.
The front axles on all HEMTTs are single-reduction Oshkosh 46K, the rear are Dana single-reduction which vary according to configuration. Drive to the front axles is selectable and all axles have differential locks. Suspension on A0/A1/A3 models is by Hendrickson leaf springs with equalizing beams. Suspension on A4 models is Holland air suspension, load rating on the rear axles varying by configuration. Tire size is 1600 R20 on all models, and standard tire fit is Michelin XZL.
All models are capable of fording water crossings up to 48 in (120 cm) deep, and can climb a gradient of at least 60%. All original variants are air transportable in the C-130. All variants are air-transportable in the C-17.
Original HEMTT models now have the suffix A0. Only the M984 wrecker was produced in A1 configuration. All models were produced in A2 configuration. The A3 suffix is applied to HEMTT technology demonstrators with a diesel-electric drive system. Current HEMTT production models have the suffix A4." |
|---|
| dateOfIntroduction | 1982 |
|---|
| countryOfOrigin | "United States" |
|---|
| proliferation | "Bahrain, Brazil, Egypt, Greece, Israel, Jordan, Kuwait, Morocco, Oman, Qatar, Russian Federation, Saudi Arabia, South Korea (Republic of Korea), Turkey, United Arab Emirates, United States of America" |
|---|
| selectedregions | |
|---|
| checkedregions | |
|---|
| checkedcountries | | "Bahrain" |
| "Brazil" |
| "Egypt" |
| "Greece" |
| "Israel" |
| "Jordan" |
| "Kuwait" |
| "Morocco" |
| "Oman" |
| "Qatar" |
| "Russian Federation" |
| "Saudi Arabia" |
| "South Korea (Republic of Korea)" |
| "Turkey" |
| "United Arab Emirates" |
| "United States of America" |
|
|---|
| dis | | name | "HEMTT CGO M977 WHL" |
|---|
| string | "01.01.225.007.019.001.000" |
|---|
|
|---|
| images | | "M977_HEMTT(A).jpg" |
| "M977_HEMTT(B).jpg" |
| "M977_HEMTT(C).jpg" |
|
|---|
| sections | | name | "System" |
|---|
| properties | | name | "Alternative Designation" |
|---|
| value | "M977 HEMTT" |
|---|
|
| name | "Type" |
|---|
| value | "Heavy Expanded Mobility Tactical Truck (HEMTT) Cargo Truck" |
|---|
|
| name | "Manufacturer" |
|---|
| value | "Oshkosh Corporation" |
|---|
|
| name | "Configuration" |
|---|
| value | "8x8" |
|---|
|
| name | "Family" |
|---|
| value | "Heavy Expanded Mobility Tactical Truck (HEMTT)" |
|---|
|
| name | "Crew" |
|---|
| value | "2" |
|---|
| units | "ea" |
|---|
|
| name | "Payload Capacity" |
|---|
| value | "9,979 kg" |
|---|
|
| name | "Material Handling Crane Maximum Capacity" |
|---|
| value | "1,134 kg at 5.8 m boom length" |
|---|
|
|
|---|
|
| name | "Dimensions" |
|---|
| properties | | name | "Length" |
|---|
| value | "10.17 m" |
|---|
|
|
| name | "Height" |
|---|
| value | "2.57 m" |
|---|
|
| name | "Distance Between Equalizer Pivots" |
|---|
| value | "5.33 m" |
|---|
|
| name | "Distance Between Axles, 1st to 2nd" |
|---|
| value | "1.52 m" |
|---|
|
| name | "Distance Between Axles, 2nd to 3rd" |
|---|
| value | "3.81 m" |
|---|
|
| name | "Distance Between Axles, 3rd to 4th" |
|---|
| value | "1.52 m" |
|---|
|
| name | "Weight" |
|---|
| value | "17,191 kg" |
|---|
|
|
|---|
|
| name | "Automotive" |
|---|
| properties | | name | "Engine Name" |
|---|
| value | "1 x Detroit Diesel 8V-92TA" |
|---|
|
| name | "Engine Type" |
|---|
| value | "736-cu in(12.06-liter) liquid-cooled, 2-stroke, V-8 diesel" |
|---|
|
| name | "Engine Power" |
|---|
| value | "445 hp at 2,100 rpm" |
|---|
|
| name | "Power-to-Weight Ratio" |
|---|
| value | "16.18 hp/metric ton" |
|---|
|
| name | "Transmission" |
|---|
| value | "Allison HT740D automatic transmission with torque converter 4 forward/1 reverse gears" |
|---|
|
| name | "Suspension" |
|---|
| value | "8 x 8 (8 wheels driving, 4-wheel steering); Hendrickson leaf spring w/steel saddle, equalizing beams, and 10-in (254-mm) vertical travel on front and rear; RT340 model rear springs on all but M985 (RT380) and M984A1 (RT500)" |
|---|
|
| name | "Maximum Speed" |
|---|
| value | "88 km/h" |
|---|
|
| name | "Range" |
|---|
| value | "483 km; w/full load at 54 km/h" |
|---|
|
| name | "Fuel Capacity" |
|---|
| value | "589 liters" |
|---|
|
| name | "Tire Size" |
|---|
| value | "16.00R20" |
|---|
|
| name | "Gradient" |
|---|
| value | "60 percent" |
|---|
|
| name | "Side Slope" |
|---|
| value | "30 percent" |
|---|
|
| name | "Fording Depth" |
|---|
| value | "1.23 m" |
|---|
|
| name | "Payload Capacity" |
|---|
| value | "9,979 kg" |
|---|
|
|
|---|
|
| name | "Protection" |
|---|
| properties | | name | "Armor" |
|---|
| value | "A-kit/B-kit; U.S. Army Long Term Armor Strategy (LTAS) compliant" |
|---|
|
| name | "Applique Armor" |
|---|
| value | "Available" |
|---|
|
| name | "Active Protection System" |
|---|
| value | "INA" |
|---|
|
| name | "NBC Protection" |
|---|
| value | "Yes" |
|---|
|
| name | "Smoke Equipment" |
|---|
| value | "No" |
|---|
|
|
|---|
|
|
|---|
| variants | | name | "M977" |
|---|
| notes | "The M977 cargo truck variant is the base member of the HEMTT family. The current model is the M977A4; there was no M977A1. In addition to the basic M977A0/A2/A4 cargo truck, two other variants are available. The M977A0/A2/A4 Electrical Power Plant (EPP) has an extended cargo body (6.041 m (19.82 ft) inside length) and is used to hold and transport generators for the Patriot air-defence missile system. There is no material handling crane on the EPP. The M977A0/A2/A4 Large Repair Parts Transporter (LRPT) and the basic M977 cargo truck are fitted with a light-duty Grove materials handling crane mounted at the rear of the chassis." |
|---|
|
| name | "M978" |
|---|
| notes | "The M978 is a 9,500 liter capacity tanker. The current model is the M978A4; there was no M978A1. The M978A0 was produced in both potable water (approximately 18) and fuel servicing truck variants, the A2 and A4 models have only been produced in the fuel servicing truck variant." |
|---|
|
| name | "M983 Tractor" |
|---|
| notes | "The M983 is a tractor unit for use with the trailer-mounted MIM-104 Patriot missile system. It can also be used with the Interim Stryker Recovery System, or other trailers. An earlier variant fitted with a 30 kW generator and crane mounted behind the cab was used to tow the Pershing II Erector Launcher in CONUS (a M1001 MAN tractor was used in West Germany). The M983A2/A4 Light Equipment Transporter (LET) tractor is mainly used to transport construction and engineer equipment. It has a 45,000 lb (20,000 kg)) 2 speed hydraulic winch mounted behind the cab used to load the trailer. It does not have a self-recovery winch." |
|---|
|
| name | "M984A1 Wrecker" |
|---|
| notes | "The M984 wrecker is the only HEMTT variant to have been produced in the A1 configuration, and this resulting in the change of recovery crane and retrieval system between A0 and A1 configurations. The current model is the M984A4. Standard equipment includes a 27,240 kg (60,050 lb) capacity two-speed recovery winch, a rear-mounted 11,340 kg capacity vehicle retrieval system, and a 6,350 kg (14,000 lb) at 2.74 m (9.0 ft) capacity Grove materials handling crane. A 9,072 kg (20,000 lb) bare drum capacity self-recovery winch is fitted as standard on the M984." |
|---|
|
| name | "M985 Cargo" |
|---|
| notes | "The M985 is available in two variants. The current models are A4; there were no A1 models. The M985 cargo variant is similar to the M977 cargo truck but was developed to support the M270 Multiple Launch Rocket System (MLRS) with a M989A1 HEMAT trailer. It may also used to transport Patriot missiles. The M985 Guided Missile Transporter (GMT) was developed specifically for use with the Patriot system and it can be distinguished easily from other cargo models by its rear-mounted Hiab 8108/2 materials handling crane" |
|---|
|
| name | "Taiwanese RT-2000 Multiple Rocket Launcher" |
|---|
| notes | "The RT-2000 [Lit; Ray-Ting-2000 or Thunder -2000] rocket launcher mounted on an M977 chassis. In service about 1997. Can mount any one of three launchers: Mk 15 117-mm, 60 rounds; Mk 30, 30 rounds with HE; AP/AM cluster warhead - >18-mile range; Mk 45 12 rounds, > 27-mile range, GPS targeting. See separate record for details." |
|---|
|
| name | "M1120 HEMTT Load Handling System (LHS)" |
|---|
| notes | "The M1120 Load Handling System (LHS) variant was initially introduced as part of the HEMTT overhaul/rebuild program, during which returned M977 cargo trucks have their cargo bodies and materials handling cranes removed, to be replaced by a Multilift Mark 5 (now designated MPH165-LHS) LHS, as fitted to the Oshkosh PLS truck." |
|---|
|
| name | "M1977 HEMTT Common Bridge Transporter (CBT)" |
|---|
| notes | "The M1977 HEMTT Common Bridge Transporter (CBT) is a further development of the M1120 LHS, and in common with the M1120 LHS was initially introduced as part of the HEMTT overhaul/rebuild program. It is used for loading, transporting, and unloading Ribbon Bridge components and bridge erection boats." |
|---|
|
| name | "M1142" |
|---|
| notes | "The M1142 is a Tactical Fire Fighting Truck (TFFT) capable of extinguishing aircraft, petroleum, brush, and structural fires at isolated military installations. The TFFT is based on a HEMTT M977A2 chassis with the heavier duty M1120 LHS HEMTT variant rear suspension. The TFFT contract was awarded to Pierce Manufacturing with Oshkosh Corporation as a subcontractor to Pierce." |
|---|
|
| name | "M977 A2 Cargo Truck" |
|---|
| notes | "Basic version." |
|---|
|
| name | "M977 A2 EPP" |
|---|
| notes | "Electrical power plant." |
|---|
|
| name | "M977 A2 LRPT" |
|---|
| notes | "Large repair parts transporter." |
|---|
|
| name | "M978 A2" |
|---|
| notes | "Fuel servicing transporter truck tanker." |
|---|
|
| name | "HEMTT M983 A2 LET" |
|---|
| notes | "Light equipment transporter." |
|---|
|
| name | "HEMTT M983 A2" |
|---|
| notes | "Patriot missile tractor." |
|---|
|
| name | "M984 A2" |
|---|
| notes | "Recovery truck." |
|---|
|
| name | "M985 A2" |
|---|
| notes | "Cargo and MRLS resupply." |
|---|
|
| name | "M985 A2 GMT" |
|---|
| notes | "Guided missile transporter." |
|---|
|
| name | "M1120 A2 HEMTT-LHS" |
|---|
| notes | "Heavy expanded mobility tactical truck." |
|---|
|
| name | "M1977 A2 CBT" |
|---|
| notes | "Common bridge transporter." |
|---|
|
| name | "M1977 A2 CBT" |
|---|
| notes | "Common bridge transporter." |
|---|
|
|
|---|
| type | "WEG" |
|---|
| version | 1 |
|---|
