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)

3.5.5 Tank openings.

3.5.5.1 Sewage and waste opening. The tank shall be equipped with a 125 mm (5-inch) diameter pipe which shall be connected to the power hose reel by a flexible coupling for discharging sewage and waste into the rear compartment.

3.5.5.2 Hydrant opening. The tank shall be equipped with a 64 mm (2.5-inch) diameter opening which shall discharge hydrant water into the front compartment of the tank body.

3.5.5.3 Tank drain. A 100 mm (4-inch) tank drain shall be provided to empty the tank body of water directly into a 100 mm (4-inch) diameter pipe to a tee which shall either divert water onto the street or into the centrifugal pump for either agitating sewer basins or flushing. The

tank drain shall be located directly below the hatch cover to be accessible for cleaning. The tank drain shall be provided with a 100 mm (4-inch) gate shut-off valve under the tank; quick release rubber coupling to disengage the drain pipe from the tank for hoisting the tank and to prevent vibration; a 75 mm (3-inch) gate shut-off valve and tee connection at the street discharge end. The tee connection shall be piped into the centrifugal pump for adding water under pressure to break solids in catch basins, wash down underground chambers, and flush streets.

3.5.6 Auxiliary engine. An auxiliary engine driven power unit operating on the same type of fuel as the main chassis engine shall be provided.

3.5.6.1 Auxiliary engine mounting and enclosures. The auxiliary engine power unit shall be a liquid cooled, four-stroke cycle, (two or four-stroke cycle for diesel engines) reciprocating, industrial type. The engine shall be mounted on structural steel frame members of sufficient length and strength for the imposed loads to provide mounting of the clutch power takeoff unit and the hydraulic and centrifugal pumps. The entire power unit shall be enclosed and shall be fitted with ventilation panels and hood. The total enclosure shall prevent road splash and rain. Removable access panels, constructed with louvers for ventilation, shall be installed on each side and secured with a spring loaded locking device. Hinges shall be bolted to cabinet doors. The panels and doors shall not vibrate or drum. The panels and doors shall be constructed of 16 gage (1.519 mm) (0.0598 inch) hot rolled mild steel.

3.5.6.2 Engine. The auxiliary engine shall have not less than a 4330 cm3 (264-cubic inch) displacement and shall provide power for the hydraulic system and the centrifugal pump. The engine shall provide sufficient power to simultaneously operate the centrifugal pump the hydraulic baffle agitator, and the power hose reel.