MIL-T-46765 Trucks, Tank: Sewage And Waste, Dump Type, 4550 And 7570 Liter 1200 And 2000 Gallon, Modified CommercialThis specification covers diesel and gasoline engine driven trucks equipped with a hydraulic lift dump tank, an auxiliary engine driven centrifugal pump, and associated hoses and equipment for loading and unloading the dump tank with sewage and waste materials. The vehicle is capable of cleaning sewers, septic tanks, catch basins, manholes, and sludge pits. The trucks have minimum gross vehicle weights GVW of 11 350 kilograms kg 25,000 pounds in a four wheel, two wheel drive 4x2, 4550 liter L 1200 gallon size; and 15 650 kg 34,500 pounds in a six wheel, four wheel drive 6x4, 7570 L 2000 gallon size; for normal rating conditions. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-46765(AT)

channel formed rub rail of minimum width to cover rear dual tire treads shall be provided. Front head sheet shall be formed or reinforced for rigidity. Front head and tailgate shall be the same height as the sides. The interior of body shell and side reinforcements shall be welded with continuous welds. The rub rail shall be attached using continuous welds, or with intermittent welds for not less than 50 percent of the edge length of contact edges. The body interior shell shall be watertight and of smooth skin construction.

3.5.2.1 Tailgate. The tailgate panel shall be not less than 10 gage (3.416 mm) (0.1345 inch) steel. When tailgate is closed, the tailgate shall be watertight. The tailgate shall have heavy duty hardware and a heavy duty tailgate latch operable by a control at the front curbside corner of the tank body. The tailgate shall be reinforced to prevent deformation under load.

3.5.2.2 Body understructure. Body longitudinal sills, each having a minimum section modulus equivalent to that provided by a 125 mm (5 inches) by 14.9 kg/m (10 pounds per foot)

I-beam, shall be provided to support hoist load. Not less than eight crossmembers, each having a minimum section modulus equivalent to that provided by a 100 mm (4 inches) by 8 kg/m

(5.4 pounds per foot) channel shall be provided to support an evenly distributed load. Crossmembers shall be welded to the body shell with not less than 100 mm (4-inch) lengths of

weld, front and rear of both ends of each crossmember, and with staggered intermittent welds on not less than 300 mm (12-inch) centers. Contact edges of crossmembers with longitudinal sills,

and contact edges of welded reinforcements shall be welded for not less than 50 percent of the edge length.

3.5.2.3 Baffles. Three baffles shall be furnished. The baffles shall be minimum 10 gage (3.416 mm) (0.1345 inch) steel. The baffles shall be installed vertically and shall be hinged at the top so that the baffles swing back when the tank body is elevated for discharging the tank contents. Stops shall be provided to prevent the baffles from swinging forward. The baffles shall be the height and width of the interior of the body tank, and have a minimum clearance on the bottom. The front baffle shall have staggered, 19 mm (.750-inch) diameter holes with a center to center distance of approximately one inch. The open area shall be 51 percent of the baffle area. Hydraulically operated baffle agitator shall be furnished to clear the sewage waste

from the front baffle and permit the flow of clear water into the front compartment. The two rear

baffles shall be solid. Each of the two rear baffles shall have a notch on the top edge of sufficient size to allow flow of waste material from one compartment to another. One baffle shall have the notch on the street side and the other baffle shall have the notch on the curb side. The purpose of the notches is for overflow of water from one compartment to the next compartment. The forward baffle shall strain out the sewage to a liquid state. The rear baffle shall be approximately 1220 mm (48 inches) from the tailgate. The two forward baffles shall be located so that the three forward compartments are of equal capacity.