MIL-T-740 Trucks; 5 Ton, 6X6, Military Design, M39, M39A1, M39A2 And M809 SeriesThis specification covers general and special purpose 5 ton, gasoline, multi-fuel, and diesel engine powered, six-wheel, six-wheel drive, military design truck chassis, trucks, and truck tractors having single front and dual rear wheels.

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MIL-T-740G

1/ Group 1 - Gasoline engine, R26602. Group 2 - Multi-fuel enging, LDS-465-1.

Group 3 - Diesel engine.

2/ Curb weight. in pounds (column 2).

Truck chassis - Includes weight of chassis with soft-top cab, fully serviced with fuel, lubricants, coolants and on vehicle equipment including winch (860 pounds), without payload and operating personnel.

3/ Gross load allowance, in pounds (column 3), consists of body and payload without

operatiang personnel (400 pounds) included for truck chassis only.

4/ Payload allowance, in pounds (column 4) - Covers payload for complete truck without

operating personnel.

5/ Towed-load allowances, in pounds (Column 5) - Includes pintle towed trailers, equipped

with pneumatic tires.

6/ Semitrailer towed loads includes truck-tractor fifth-wheel load allowances.

7/ Towed suspended payload (less crew) on crane hook with boom braced and secured.

8/ Wo/W model weight.

9/ On fifth wheel.

3.4.4 Engine. Engine, when properly installed, shall meet performance requirements under all test conditions.

3.4.4.1 Cooling system. The cooling system shall maintain a coolant temperature at engine outlet of no greater than 220°F, with no evidence of aeration from the radiator, under all environmental and performance requirements specified herein, and in the engine specifications.

3.4.5 Cross-country operation. The vehicle shall transport the rated payload and towed-load over unimproved roads, trails, open fields, hills, and rough cross-country terrain.

3.4.5.1 Limited cross-country operation. The vehicle, except truck tractor in combination with semitrailer, shall transport the rated payload and towed load over reasonably firm terrain, other than highways or roads.

3.4.6 Highway operation. The vehicle shall transport the rated payload and towed load over prepared roads. Performance shall be demonstrated on smooth, dry, relatively level concrete roadway.

3.4.6.1 High speed. The vehicle transporting its rated payload and towed load, shall operate at a sustained high speed of not less than 50 miles per hour (mph).

3.4.6.2 Low speed. With the engine operating in the speed range which delivers maximum torque, the vehicle shall operate at a sustained low speed of not more than 2 1/2 mph without damage to vehicle.