MIL-T-62246 Truck, Dump, Street Maintenance, Diesel And Gasoline Engine Driven, 21,000 Pounds Gvw, 4X2, CommericalThis specification covers diesel and gasoline engine driven, four-wheel, two-rear-wheel drive dump trucks equipped with a material sprayer, an auxiliary engine driven air compressor, and a vibrating roller for use in street maintenance. Vehicles shall have a minimum gross vehicle weight GVW of 21,000 pounds for normal operating conditions. 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-62246B(AT)

* 3.4.10.3 Spare wheel or rim. When specified (see 6.2), a spare wheel or rim shall be furnished. When a spare tire assembly is specified (see 3.4.10.4), a spare tire wheel or rim shall be furnished.

* 3.4.10.4 Spare tire assembly. When specified (see 6.2), a spare tire assembly shall be furnished and shall be stowed securely on the vehicle for shipment. The spare tire assembly shall include an inflated spare tire mounted on the spare wheel or rim. The spare tire shall be of the same size, tread design, and load range (ply rating) as the tires furnished on the vehicle.

* 3.4.11 Brakes. The brakes shall conform to Federal Motor Carrier Safety Regulations

393.40 through 393.42 and 393.45 through 393.52. When available as the manufacturer's

standard or as an option, brake linings shall be of nonasbestos material.

3.4.11.1 Power-hydraulic brakes. Unless otherwise specified (see 3.4.11.2), the vehicle shall be equipped with power assisted, hydraulically actuated, four-wheel service brakes.

* 3.4.11.1.1 Split hydraulic brake system. The power-hydraulic brake system shall be so arranged as to provide separate systems for at least two wheels and so designed and constructed that rupture or leakage type failure of any single pressure component of the service brake system, except structural failures of the brake master cylinder body, effectiveness indicator body, or

other housing common to the divided system, will not result in complete loss of function of the

vehicle brakes when force on the brake pedal is continued. "Pressure component" means any internal component of the brake master cylinder or master control unit, wheel brake cylinder, brake line, brake hose, or equivalent, except power assist components.

* 3.4.11.1.2 Indicator light. The split hydraulic brake system shall be equipped with an electrically operated red light mounted on the instrument panel to indicate system effectiveness. The light shall have an area of not less than 0.196 square inch. It shall illuminate before or upon application of the brakes when an actuating-pressure component of the system has sustained a loss of pressure. The indicator light system shall include a means for testing by the vehicle operator to assure that the light bulb is operable.

3.4.11.2 Air brakes. When specified (see 6.2), the vehicle shall be equipped with

four-wheel, full air brakes. The braking system, complete with all necessary components, shall include: