MIL-T-62145 Trucks: Elevating Body, Diesel And Gasoline Engine Driven, 21,000 To 39,500 Pounds Gvw, 4X2 And 6X4, CommercialThis specification covers diesel and gasoline engine driven four-wheel, two-rear-wheel drive, and six-wheel, four-rear-wheel drive vehicles having minimum gross vehicle weights GVW of 21,000 to 39,500 pounds, for normal operating conditions. The vehicles are commercial trucks equipped with stake and platform or van bodies, capable of elevating the body and cargo to a specified height for loading and unloading the cargo into and out of aircraft. The vehicles procured under this specification are commercial items which shall be warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62145E

* 3.4.1.2 Gasoline. When specified (see 6.2), the vehicle shall be equipped with a liquid cooled, internal combustion, four-stroke cycle gasoline engine with not less than six cylinders. The engine furnished shall produce the required vehicle performance when operated on unleaded fuel with a research octane rating of 91, a motor rating of 83 and an average octane rating of 87

at an engine speed not more than the manufacturer's recommended operating speed. The engine

shall be capable of warranted operation on unleaded fuel when used in accordance with the operators manual. Unless otherwise specified or required by foreign laws, vehicles for overseas use shall be capable of accepting and operating on leaded gasoline. Engine net horsepower figures used in performance prediction calculations shall be determined in accordance with

SAE 11349.

3.4.1.3 Oil filter. A full flow type oil filter shall be furnished.

3.4.1.4 Governor. An engine governor shall be furnished and set and sealed to limit the engine to engine manufacturer's maximum recommended operating speed.

* 3.4.1.5 Cooling system. The cooling system shall maintain engine coolant at a temperature below the boiling point with the vehicle loaded and operated at an altitude of 10,000 feet above sea level or in an ambient air temperature of not less than 125 degrees Fahrenheit ( F). The coolant system shall include a surge tank or a coolant recovery reservoir of not less than

two-quart capacity. On tilt cab models, a radiator servicing access door shall be provided to

allow ready verification of coolant level.

* 3.4.1.6 Coolant temperature control. Thermostatic control of engine coolant temperature shall be provided. For diesel driven vehicles, the control shall include complete thermostatic control of all coolant flow through the radiator.

* 3.4.1.7 Fan clutch. A fan clutch shall be provided. The fan clutch shall reduce the fan speed automatically when the fan is not required for engine cooling. The fan clutch shall be asbestos free.

3.4.1.8 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater, an engine oil heater, a hydraulic fluid reservoir heater, and a fuel warmer (diesel engine driven vehicles only) shall be provided. Unless otherwise specified (see 6.2), a battery heater shall be provided when power plant heaters are specified. The heaters shall operate on 110-volt alternating current (ac), and shall be wired through a junction block, including a fuse or circuit breaker, to a single three-pronged (male), weatherproof, slave receptacle for receiving external power and grounding the vehicle. A three-wire connecting cable, 25 feet long and of adequate line capacity to supply power for all heater units simultaneously, shall be furnished. The connecting cable shall include a matching female connector at the vehicle end and a standard weatherproof, three-pronged (two power plus one ground) male connector at the other end.