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

Heavy duty waterproof system providing protection from environment, physical damage, shock and vibration; 12-volt system potential with negative ground per SAE J538.

VMRS 34-002

VMRS 34-002-007

VMRS 34-004-021

Tail and Stop Lamp.

Furnish total of 4 ea. on rear of semitrailer providing functions of

2-ea. outboard turn and clearance plus 2-ea. inboard stop and

tail.

Lamps per TTMA RP No. 14 and SAE J759, coding SAE-IST,

all of the flush-mounted type either elastomer ring with hermetrically sealed unit or elastomer housing with shock mount bulb socket, a snap-on or screw-on lens, and elastomer gasket. Round, 4-in. dia. size lamp installed flush in the TTMA standard

4.5-in. hole.

Double filament configuration having 3-wire pigtail including a ground wire to the semitrailer framing member.

Install lamps in rear frame in sub-frame cross member, or within body mounted boxes. Provide all lamps recessed forward from

the body dump edge to aford lamp protection from backing into stockpiles and into loading docks.

Relfectors - Safety.

Furnish reflectors per TMC-ATA RP-702 and TTMA RP No. 9 plus 2-ea. additional on the front facing forward. Secure all reflectors to the vehicle with metal fasteners.

No reflectors installed on the tailgate because of shock breakage.

Lamps - Marker.

All running lamps (clearance not in combination lamps, identification, and side marker) per SAE J592 and TMC-ATA RP-108, either flush mount type per RP-108/1 or in-line protective lens type per RP-108/3. All lamps equipped with polycarbonate plastic lenses and either hermetrically sealed shock resistant filaments or fleet service bulbs per TMC-ATA Advisory AY 1-2 having the trade number cited therein.

All running lamps, clearance, identification, and side marker of

same interchangeable make and model. Locations per

TMC-ATA RP-702 and TTMA RP No. 9.