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

20,000 Miles (for trucks)

Hard-surfaced roads

30 percent

Gravel and dirt roads

Level and hilly

28 percent

41 percent

cross-country 1/

d. Belgian block (or equal) 1 percent

20,000 Miles (for truck-tractors)

Hard-surfaced roads

60 percent

Gravel and dirt roads

Level and hilly

24 percent

15 percent

cross-country 1/

d. Belgian block (or equal) 1 percent

11,400 Miles (for wreckers and vans)

Hard-surfaced roads

66 percent

Gravel and dirt roads

Level and hilly

13 percent

20 percent

cross-country 1/

d. Belgian block (or equal) 1 percent

1/ Level and hilly cross-country mileage shall be divided as equally as is reasonable.

3.1.2 Maintainability. The total maintenance (schedule and unscheduled) for the vehicles, excluding driver or crew checks and services, shall be no more than 260 man-hours

(131 man-hours for wrecker and van models) of operation. This equates to a Maintenance Ratio

(MR) of 0.26 (0.23 for wrecker and van models) at 20 mph. Maintenance intervals are specified

in the applicable maintenance manuals and documents.

3.1.3 Durability. Vehicles with rated payload shall have no less than 0.50 probability of completing a minimum of 20,000 miles (11,400 miles for wrecker and van models) of operation without replacement or overhaul of the engine, transmission, transfer or differentials.

3.2 Materials. Materials shall be as specified herein and in referenced specifications, standards and drawings. Materials shall be free of defects which adversely affect performance or serviceability of the finished product (see 6.10).

3.2.1 Qualified products. The contractor shall be responsible for using parts, assemblies, and lubricants from Qualified Products Lists (QPL's) when required. Contractor's inspection records shall specifically list all QPL items by number and date of the QPL, name of supplier and part or drawing number(s). When parts and assemblies are approved as qualified products, but not yet listed on the QPL, the contractor shall list the products by number and date of the approved document and name of supplier(s).