The Heavy Expanded Mobility Tactical Truck (HEMTT) provides transport capabilities for re-supply of combat vehicles and weapons systems. There are five basic configurations of the HEMTT series trucks: M977 cargo truck with Material Handling Crane (MHC), M978 2500 gallon fuel tanker, M984 wrecker, M983 tractor and M985 cargo truck with MHC. A self-recovery winch is also available on certain models. This vehicle family is rapidly deployable and is designed to operate in any climatic condition where military operations are expected to occur.
Vehicle Specifications Vehicle Manufacturer: Oshkosh Truck Corporation
Dimensions:
Length: M977 / M978 / M985 - 401"; M983 - 351"; M984 - 392"
Performance:
Height: Operational 112", Transport 102" - All
Width: 96" - All
Wheelbase: M977 / M978 / M985 - 210"; M983 - 181"; M984 - 191"
Turning Circle: M977 / M978 / M985 - 100'; M983 - 91'; M984 - 95'
Vehicle Curb Weight: M977 With Winch - 38,800 lb., Without Winch - 37,900 lb.; M978 With Winch - 38,200 lb., Without Winch - 37,300 lb.; M983 With Crane - 39,200 lb., Without Crane - 32,200 lb.; M984 - 50,900 lb.; M985 With Winch - 39,600 lb., Without Winch - 38,700 lb.
Ground Clearance: 24" - AllMaximum Speed: 57 mph Governed - All
Equipment Specifications:
Cruising Range: 300 mi. @ Gross Vehicle Weight Rating - All
Maximum Grade: 60% - All
Approach Angle: 41 deg. - All
Departure Angle: 45 deg. - All
Side Slope: 30% - All
Maximum Fording Depth: 48" - AllCab: Crew Seating: 2 Man
Seat Design: Fore/Aft Adjustable
Steering Type: Dual Gear With Integrated Hydraulic Power AssistEngine: Manufacturer: Detroit Diesel Allison
Model: 8V92TA
Type: 8 cylinder, 2-stroke, V-type Diesel
Rating: 450 hp, @ 2100 rpm
Fuel: Diesel, DF-2, JP-4, JP-8, VV-F-800
Oil: 30 qt. With Filter (MIL-L-2104D, MIL-L-46167)
Cooling System: 80 qt., Water, Radiator
Fan: Engine-driven, Clutch TypeTransmission: Manufacturer: Allison, Automatic
Model: HT740D
Speeds: 4 Speeds Forward/ 1 Reverse
Oil: 38 qt. With FilterTransfer: Manufactuer: Oshkosh Truck Corporation, 55000
Type: Air Operated, Front Tandem Disconnect
Oil: 6.5 qt.Axles: Manufacturer: Front Tandem - Oshkosh Truck Corporation/Eaton; Rear Tandem - Eaton
Models:
No. 1 - RS480
No. 2 - DS480-P - All
No. 3 - M977 / M978 / M983 / M985 - DS480-P; M984 - DS650-P
No. 4 - M977 / M978 / M983 / M985 - RS480; M984 - RS650
Front Axle Steering Angle: 32 deg. - All
Oil: Front Tandem - 17.5 qt.; Rear Tandem - 21.5 qt. - AllWheels: Type: Disk
Quantity: 8 ea.
Spare Tire: 1 ea.
Rim Size: 20x10
Stud Quantity: 10 per WheelTires: Radial With Tube
Quantity: 8 ea.
Spare: 1 ea.
Tread Type: Radial Traction, Non-directional
Size: 16:00x20"Brakes: Air-activated, Internal Expansion - All
Electrical System: Alternator: Engine Driven: EMI/RFI Suppressed, Waterproof
Rating Standard: M977 / M978 / M984 / M985 - 65 Amp, Optional: M983 - 100 Amp
Batteries: 4 ea., 12v Connected in Series Parallel
Voltage: 24vSelf-Recovery Winch: Manufacturer: DP Manufacturing
Model: 20K-HEMTT
Wire Rope Diameter: 9/16"
Wire Rope Length: 200'
Line Pull - 1st Layer (With 5 Wraps Minimum): 20,000 lb.
Line Pull - 2nd Layer: 18,173 lb.
Line Pull - 3rd Layer: 16,663 lb.
Line Pull - 4th Layer: 15,361 lb.
Line Pull - 5th Layer: 14,254 lb.Recovery Winch: M984 Manufacturer: DP Manufacturing
Model: 51022 60K
Type: Automatic, Two Speed
Wire Rope Diameter: 1"
Wire Rope Length: 220'
Line Pull - 1st Layer: (With 5 Wraps): 60,000 lb.
Line Pull - 3rd Layer: 45,000 lb.Material Handling Crane: Manufacturer: M977 / M984 / M985- Grove; M983 Hiab
Model: M977 - MHC977; M983 - 8001; M984 - MHC984; M985 - MHC985
Maximum Capacity:
M977 at Boom Length of 19': 2,500 lb.
M983 at Boom Length of 10': 14,620 lb.
M984 at Boom Length of 18.2': 6,000 lb.
M985 at Boom Length of 16.5': 5,400 lb.
M977 Cargo 
M978
Fueler
M983 Tractor
M984
WreckerM985 Cargo