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)

		system. A coolant shutoff valve shall be provided for the coolant inlet side of the fuel warmer unit. The unit shall not cause heating of the fuel above 27°C (80°F)
		under any possible condition.
*	(d)	An in-tank fuel warmer or preheater unit shall be provided on diesel engine driven vehicles. The unit shall use engine coolant to transfer heat to the fuel in one fuel
		tank. The warmer shall not cause heating of any fuel above 27 C (80°F) under any possible condition, shall not disable or cause elimination of the fuel gage sending
		unit and shall not violate 3.2.1 or any Federal Motor Carrier Safety Regulation. A coolant shut off valve shall be included. The units required by 3.4.1.9(c) and (d)
		may be combined.

* 3.4.1.10 Fuel fired engine preheater. When specified (see 6.2), for diesel engine driven vehicles, a diesel fuel fired engine water heater shall be furnished to preheat the engine. The heater shall include a timer, a thermostat and a circulating pump, and shall be connected to the engine coolant system. The heater shall be capable of starting and operating at -51°C (-60°F) and shall heat the engine to +4 C (+40°F) from -51°C (-60°F) in not more than 1 hour. The system shall be equipped with a light, visible to the driver, to indicate that the preheater is operating. The system shall include fuel warmers or preheaters conforming to 3.4.1.9(c) and (d).

* 3.4.1.11 Vernier throttle control. When specified (see 6.2), a manual vernier controlled throttle with quick release shall be furnished, except on electronically controlled engines.

3.4.2 Electrical systems. The electrical system shall be in accordance with Federal Motor

Carrier Safety Regulations 393.27 through 393.31 and 393.33.

* 3.4.2.1 Starting system. A 12- or 24-volt direct current (dc) starting system with 12-volt dc lighting system shall be furnished. Engine starting equipment shall include an ether starting system, glow plug or electric grid heater. If an ether system is furnished in lieu of a glow plug or grid heater, it shall be of the measured shot type. The measured shot type ether system shall be key operated or manually operated from the driver's compartment and shall be inoperative with the engine warm. Complete provisions for a replaceable ether reservoir of not less than

355 milliliters (mL) (12 fluid ounces) shall be furnished. A reservoir need not be furnished.

When specified (see 6.2) the starting motor shall be equipped with a thermostat controlled, automatic resetting circuit breaker that will protect the motor from overcrank heat damage. The circuit breaker shall not limit cranking ability for a startable engine.

3.4.2.2 Ignition system. For gasoline engine driven vehicles, a 12-volt dc ignition system shall be furnished.