MIL-T-52698A
protection for working parts, and shall withstand, without permanent deformation, stresses induced by capacity loads when tested as specified in
4.3.2.
3.8.2 Uprights and carriage assembly. Uprights shall be the telescopic roller type. Main load rollers shall be the permanently lubricated for life type. The forks and fork carrier shall conform to ANSI B56.1 and MH11.4. The fork carrier shall be free of obstructions to allow the forks to slide across the entire width of the carrier. A cutout shall be provided in the fork carrier so that the lower hook of the fork will fit through the slot and each fork shall be removable with-out removing the load backrest. Fork thickness shall not exceed 1/2 inch at the tips and the end taper shall be not less than
14 inches long; length shall be 36 inches. Forks shall be adjustable to
obtain a fork spacing, measured between the forks, of not less than 30 inches.
3.8.3 Wheels. Trucks shall be equipped with one or two drive wheels and two load wheels. Drive wheel(s) shall be of the flat face demountable type, made from steel or cast iron mounted on angular contact ball bearings or tapered roller bearings. Accessible grease fittings shall be provided to facilitate lubrication where sealed bearings are not provided. Wheels, when equipped with new tires, shall clear any part of the truck structure by at least 1/4 inch under all conditions of operation specified herein.
3.8.3.1 Drive wheel tires. The drive wheel tire(s) shall be new and unused, and shall be not more than 12 months old on the date of shipment to the government, and shall be selected from sizes listed in the TRA Yearbook. The tires shall be of the industrial solid rubber or cushion types molded on to a new press-on type steel bond, with nondirectional type thread. Tire loadings shall not exceed the values shown in TRA Yearbook.
3.8.3.2 Load wheels. Trucks shall be equipped with polyurethane load wheels, mounted on angular contact ball bearings or tapered roller bearings. Load wheel ratings shall be sufficient to support maximum loads and operate smoothly without binding.
3.8.4 Steering. The truck shall be steered through the drive wheels by a steering handle equipped with handgrips. The diameter of the handgrips shall be between 1-3/8 and 1-3/4 inches. The truck shall turn in the same direction of the handle when in the forward motion. The forward end of the truck shall be the end containing the control handle. The steering handle shall turn the drive wheel assembly at least 90 degrees in each direction from the neutral position. A safety device, which will cause the truck to move away from the operator in the event the head of the handle should strike the operator, shall be mounted on the head of the steering handle. The steering handle shall return from an operating position to a vertical braking position when
released. The force required to hold the steering handle in any operating position shall not exceed 10 pounds.
3.8.5 Brakes. Brakes shall be of the mechanical external contracting or internal expanding or disc type mounted on the traction motor shaft, countershaft, or drive wheel(s). Brake linings shall be of the conventional type, cement bonded to the brake shoes or bolted or riveted to the carrier plate. The brake system shall be interlocked with a relay switch to cause
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