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

TABLE III. Semitrailer specification (continued).

VMRS No. Feature Requirements

VMRS 13-010-048

VMRS 13-010-030

VMRS 14-001

VMRS 16

VMRS 16-008

Valve - Release, Spring Brake.

High speed type providing selective reservoir changing, spring brake parking application emergency application and

anti-compounding features.

Air Line Coupler - Service and Emergency Gladhands per

SAE J318, color coded yellow for control (service) on curbside, and color coded red for supply (emergency) on roadside.

ID tags and captive chained manual gladhand dust covers. Spring load gladhand covers to prevent falling below the upper

coupler plate.

Gladhand location, 2-ea. on front of semitrailer per TMC-ATA

RP-703 and SAE-J702

Frame Assembly.

All welded construction having steel framing members or

aluminum framing members.

Frame type chassis furnished with the main frame longitudinal

members of the continuous type. Frameless type chassis furnished with articulating elevating arms locating the kingpin and running gear under the body within industry tolerances.

Suspension.

Unless otherwise specified, provide flexibly sprung, suspension

of the equalizing type having min. 22,000 lb. per axle rating. When specified (see 6.2), provide an air suspension system having min. 20,000 lb. per axle rating.

Provide single (1-axle), tandem (2-axle), or tandem (3-axle) as

specified herein and in the applicable dump semitrailer specification sheet.

Provide stabilized ride for loaded semitrailers with a high center of gravity without hazardous handling and provide soft,

non-damaging ride for empty semitrailers. Provide suspension to protect semitrailer from damaging shock and vibration.

Multi-axle suspensions having min. 8-in. of both front to rear and diagonal walk axle articulation. Installation and ajustment

of suspension per both axle and suspension mfgrs. recommendations.

Air Ride.

When specified (see 6.2) provide air-spring type intended for on-off road use.