KKK-T--683F
3.4.2 Wheel bearings. All wheels shall be equipped with anti--friction ball or
roller bearings capable of sustaining the same load rating required for the
wheels.
3.4.3 Threaded fasteners. The screw threads of all threaded fasteners shall
conform to FED-STD-H28.
3.5 Performance. The type I truck loaded to not less than 1,200 pounds, the
type III truck loaded to not less than 500 pounds, and the type VI truck loaded
to not less than 700 pounds shall withstand a step drop of 2 inches without
evidence of permanent distortion, breakage, or loosening of fixed components
when tested as specified in 4.5.2.1. The type II truck loaded to not less than
300 pounds and the type V truck loaded to not less than 700 pounds shall
withstand the tip and roll--off test specified in 4.5.2.2 without evidence of
permanent deformation, breakage, or loosening of fixed components.
3.6 Detailed type requirements.
3.6.1 Type I. The type I drum truck shall have wheels outside of the frame and
shall be constructed of steel tubing, pipe, and shapes. The truck shall be
balanced to stand upright on the wheels and nose with the leading edge of the
nose resting on the operation surface. The nose shall be tapered on the leading
edge to facilitate insertion under the load. The axle shall be a through type
and secured to prevent axle rotation.
3.6.1.1 Sliding hook. The truck shall be furnished with an adjustable sliding
hook for retaining the drum.
3.6.1.2 Wheels. Wheels shall be metal wheels with solid rubber or polyurethane
tires, shall be a minimum of 10 inches diameter by 2.50 inches rim width, and
shall meet the load ratings of the ICWM standard for industrial wheels.
3.6.2 Type II. The type II gas cylinder truck shall have wheels outside the
frame and shall be constructed of steel or aluminum. Means for supporting the
cylinder shall be provided. The truck shall have two rear mounted swivel casters
to provide a three--point suspension in the normal trucking position.
3.6.2.1 Rear caster assembly. The rear caster assembly shall consist of two
swivel casters, a mounting plate, and a supporting structure. The assembly shall
be retractable when the truck is standing in the upright position. The casters
shall be industrial, light duty, swivel, and plate mount type with 3 to 5 inches
wheel diameters. The caster tires shall be conductive rubber in accordance with
NFPA 99.
3.6.2.2 Securing device. A spring--loaded chain, encased in rubber or plastic
tubing, shall be provided to hold the cylinder in place.
3.6.2.3 Wheels. Wheels shall be a minimum of 8 inches diameter by 2 inches rim
width and shall meet the operational load ratings of the ICWM standard, for
industrial wheels. The wheels shall be equipped with molded on solid rubber
conductive tires in accordance with NFPA 99.
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