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)

3.5.6.3  Engine control devices.  Control devices shall be furnished for the engine.

Automatic control devices shall include a high temperature control (coolant control set at 104°C

(220°F)), an oil pressure control set at the engine manufacturer's minimum recommended oil pressure, and an overspeed control operated independently from the governor mechanism and requiring manual resetting.  Manual control devices shall include a choke (gasoline engine only) and a throttle.  The manual throttle control shall permit operation of the engine at any selected speed and shall not restrict the action of the governor when the engine in operating at governed speeds.

3.5.6.4  Ignition or starting system.  The ignition or starting system shall be a 12-volt electrical circuit with a negative ground.  The battery source shall be the truck battery system (see 3.4.2.6).

3.5.6.5  Engine components.  The engine fuel supply shall be provided by the truck chassis fuel tank.  A fuel pump and filter shall be provided.  The muffler shall be positioned so that the fumes do not interfere with the operator.

3.5.6.6  Engine accessories.  The following engine accessories shall be panel mounted, identified as to their function, waterproof, and installed in a manner to facilitate removal and service:

(a)   Choke (gasoline engine only) (b)   Throttle

(c)   Key-operated ignition or starting switch

(d)   Oil pressure gage

(e)   Tachometer

(f)   Starter button

(g)   Water temperature gage

(h)   Hour meter

The choke (gasoline engine only), throttle, ignition and starter switch shall be in an accessible position to permit the operator to operate the auxiliary engine while standing on the ground.

3.5.7  Power takeoff clutch unit.  A power takeoff clutch unit shall be provided, mounted directly on the engine, and controlled by a hand-operated lever located in an accessible position to permit the operator to engage or disengage the clutch while standing on the ground.  The power takeoff clutch shall be the manufacturer's standard with torque capacity exceeding maximum delivered engine torque.  The power takeoff clutch shall be provided with SAE power takeoff openings.  The power takeoff unit shall drive the centrifugal pump.

3.5.8  Centrifugal pump.  A high pressure type, single stage centrifugal pump shall be provided.  The pump shal1 have a 100 mm  (4-inch) suction port and a 75 mm (3-inch) discharge port.  The pump shall be capable of pumping water from the tank body and delivering water at

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