MIL-S-46777 Semitrailers, Dump, Commercial, General Specification ForThis specification covers various sizes of rear dump semitrailers. The dump semitrailers are operated by the truck-tractors hydraulic system, unless the self-contained engine driven hydraulic option is required.

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MIL-S-46777C

drain shall be so located at the bottom of the sump for complete drainage of the fuel tank. Drainage shall be provided to preclude spillage of fuel on any area of the vehicle.  The tank filler shall be provided with a protective screen and vent.  A shut-off valve shall be provided in the

line to the power source and shall be adjacent to the fuel tank.  An identification plate shall be furnished and marked denoting the type of fuel to be used and shall be located in a conspicuous location near the filler cap (see 3.2.2.1.5).  Terne-plate fuel tanks shall not be supplied when diesel engines are furnished.

3.8.7  Exhaust system.  The exhaust system shall be furnished with a legally quiet, corrosion-resistant muffler and means shall be provided to vent exhaust fumes away from operating personnel.  Muffler and exhaust pipe shall be enclosed with a corrosion-resistant, ventilated metal shield.  The outlet shall be provided with an elbow and counterbalanced rain cap to preclude weather entering the exhaust system.  The rain cap shall open upon exhaust pressure.

3.9  Semitrailer.  The semitrailer specifications shall be in accordance with table III.  The component sequence and number system shall be in accord with the "Vehicle Maintenance Reporting Standards" (VMRS), the trucking industry standardization system of the American Trucking Associations (ATA).

TABLE III.  Semitrailer specifications.

VMRS No.                             Feature                                                     Requirements

Group 10                             Chassis.

Provide strength, flexibility, and rigidity,

to withstand dynamic transport,

both highway and off-road, and to withstand loading and

unloading operations.

VMRS 12-001                     Axle - Rear, Non-Driven.

Provide single, 2-ea., or 3-ea., as specified herein,

and in the applicable dump semitrailer specification sheet; Axles per DOT FMVSS and TTMA RP No. 39; Min. ratings per each axle as follows:

-     Min. 20,000 lb. partial rated GAW at hub for subsequent

total GAWR at ground.

-     Min. 25,000 lb. bearing and axle beam rating.

-     Min. 20,000 lb. brake rating.

Provide industry standarized 71.5-in. treat for disc wheel applications.

VMRS 12-001-001              Tube - Rear Axle, Non-Driven.  Hardened and ground steel spindles.

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