MIL-T-62021 Trucks, Pipe And Sewer Cleaner: High Pressure Water Jet Type, 5680 Liter 1,500 Gallon, 12 700 Kilograms 28,000 Pounds Gvw, 4X2, Modified CommercialThis specification covers diesel and gasoline engine driven, four-wheel, two-rear-wheel drive, 5680 liter L 1,500 gallon, high pressure water jet, pipe and sewer cleaner modified commercial trucks having a gross vehicle weight GVW of 12700 kilograms kg 28,000 pounds, for normal operating 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-62021E(AT)

3.5.2.1 Tank connections. The pipe connection to the pump shall be located in such a position that the entire bottom of the tank serves as a low velocity settling chamber. A 50 mm (two-inch) drain fitting equipped with a 50 mm (two-inch) gate valve, located for easy access, shall be provided in the bottom or at the rear so water can be dumped directly into a manhole without moving the machine. External sight gages or means of determining when the tank is full shall be provided on each side. The external sight gages or other means shall be located so that they are visible both during the filling operation and the cleaning operation. The tank filler mechanism shall allow the tank to be filled from both the curb side and the street side of the vehicle. Tank filler mechanism shall include a 100 mm (four-inch) air gap. The tank shall be vented at all times to prevent the buildup of either positive or negative pressure within the tank from any cause. Access opening(s) at the top of the tank, for inspection and cleaning purposes shall be furnished. A permanently attached steel ladder to provide access to the top of the tank shall be provided.

3.5.3 Auxiliary engine. Unless a power takeoff is furnished, an auxiliary engine, operating on the same type of fuel as the main chassis engine, shall be provided for driving the water pump. The auxiliary engine shall be a liquid cooled, four-stroke cycle, (two or four-stroke cycle for diesel engines) reciprocating industrial type. The engine furnished shall be capable of meeting the performance requirements when operated at an engine speed no greater than the manufacturer's recommended operating speed. When a gasoline engine is furnished, it shall have

not less than a 4920 cm3 (300 cubic inch) displacement.

3.5.3.1 Auxiliary engine mounting and enclosure. The auxiliary engine shall be totally enclosed and fitted with ventilation panels and hood that shall prevent road splash and rain. Hinged access panels, constructed with louvers for ventilation, shall be installed on each side and secured with a positive 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 not less than

16 gage (1.519 mm) (0.0598 inch) hot rolled mild steel.

* 3.5.3.2 Engine control devices. Control devices shall be furnished for the engine

(see 3.5.6). 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.

3.5.3.3 Starting system. A starting system of 12-volt dc potential shall be used on the auxiliary engine. The system shall include a starting motor with solenoid switch, an alternator, and a voltage regulator. A battery of 12-volt potential, with capacity compatible with the application, shall be furnished.