MIL-T-45380 Trucks, Maintenance: Earth Auger, Turntable Base, Diesel Engine Driven, 28,000 Pounds Gvw, 4X4, Modified CommercialThis specification covers an earth auger with a turntable, mounted on a diesel engine driven, four wheel, four wheel drive, modified commercial truck chassis having a minimum gross vehicle weight GVW of 28,000 pounds for normal operating conditions.

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MIL-T-45380E(AT)

Maximum geared speed (mph) = Governed speed (rpm) Total gear reduction x tire factor

3.3.2 Service brakes. The service brakes shall control and hold the vehicle when loaded to its specified GVW, on a 30 percent grade. The service brakes shall stop the vehicle, loaded to specified GVW, within the stopping distance requirements of Federal Motor Carrier Safety Regulation 393.52.

3.4 Chassis components.

3.4.1 Engine. The engine furnished shall be the chassis manufacturer's standard or optional engine for the commercial model truck which meets or exceeds the requirements of this specification.

* 3.4.1.1 Diesel engine. Unless otherwise specified (see 3.4.1.2), the vehicle shall be equipped with a liquid cooled, compression ignition, two-stroke or four-stroke cycle diesel engine, with not less than four cylinders. Engine net horsepower used in performance prediction calculations shall be determined in accordance with SAE J1349. The engine shall demonstrate the performance characteristics specified herein when using diesel fuel conforming to VV-F-800. In addition, when specified (see 6.2), the engine shall operate satisfactorily on grade JP-4 and grade JP-5 fuel conforming to MIL-T-5624 under emergency, short duration conditions and on grade JP-B fuel conforming to MIL-T-83133 under normal conditions. A power loss when operating on JP-4, JP-5 or JP-B is acceptable.

* 3.4.1.2 Oil filter. A full flow or combination full flow and bypass oil filter with replacement element shall be furnished.

3.4.1.3 Governor. An engine governor shall be furnished and set and sealed to limit the engine to the maximum recommended operating speed.

* 3.4.1.4 Cooling system. The cooling system shall maintain the engine coolant at a temperature below the boiling point with the vehicle loaded to GVW 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 (oF). The coolant system shall include a surge tank or a coolant recovery reservoir of not less than two-quart capacity.

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

* 3.4.1.6 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.