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|  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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