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)

3.5.12 Self-propelled sewer nozzle. A self-propelled, pump actuated nozzle for cleaning blocked sewer laterals and culverts shall be provided. Fifteen meters (50 feet) of 64 mm

(2.5-inch) diameter sewer cleaning hose for use with the nozzle shall be furnished and stowed on the vehicle.

3.5.13 Hydraulic system. A hydraulic system shall be provided. The hydraulic system shall operate the hydraulic hoist for discharging the tank, shall operate the hose reel for raising and lowering the eductor assembly, and shall operate the baffle agitator for clearing the front baffle

of sewage.

* 3.5.13.1 Hydraulic hoist. The hydraulic hoist shall be the manufacturer's standard with a minimum lifting capacity rating of class 50 for size 1200 trucks and class 70 for size 2000 trucks in accordance with the National Truck Equipment Association Dump Hoist Chart. The hoist shall lift the body to a minimum dumping angle of 50 degrees from top of truck chassis frame. Valve and power controls shall be located on the curb side of the vehicle, in a location accessible to an operator standing on the ground.

3.5.13.2 Hydraulic pump. A hydraulic pump shall be provided and shall deliver a constant volume at various speeds. The pump shall have a minimum capacity of 8620 kPa (1250 psi) at

1800 revolutions per minute (rpm) and shall be of sufficient size to provide power to elevate the

tank body with full payload, to lower and raise the power hose reel assembly at various depths, and to power the baffle agitator.

3.5.13.2.1 Hydraulic pump oil reservoir. A hydraulic oil reservoir, with a bolted-on cover and a seal with a replaceable filter mounted inside on the discharge port, shall be provided. The oil reservoir shall have a drain plug located underneath the reservoir. The reservoir shall have a splash proof vented fill cap and dip stick with graduation marks. An intake port shall be provided. The reservoir shall have sufficient capacity to operate the hydraulic circuit, plus a

20 percent reserve capacity.

3.5.13.3 Flow control valve. A flow control valve shall be provided and mounted into the system to divert the hydraulic oil either to the hydraulic hoist motor or to operate the hydraulically operated hose reel. If either the hydraulic hoist, hose reel, or baffle agitators are not operating, the hydraulic pump shall continue to circulate oil through the flow control valve and return the oil to the oil reservoir.

3.5.13.4 Three-way valves. Two three-way valves with snubbers shall be provided. One three-way valve shall operate the hose reel motor and hose reel brake cylinder. The second three-way valve shall operate the tank hoist cylinder.