MIL-P-17861F
TABLE IV.
Wheel mounting require ments for class 2. manually propelled.
3.6.3.3 Vehicular -towed (class 4A) wheel-mounted. The four-wheeled tandem
axle undercarriage for class 4A pump units shall be applicable to sizes 90M and
70MT and larger rated pumps on an optional basis. Wheel mountings shall be
designed for vehicular towing up to speeds of 50 mph on improved roads and over
graded gravel roads at speeds up to 20 mph with wheel and tire sizes -specified
in 3.6.3. The undercarriage shall include a drawbar and lunette-type towing
ring adjustable from 20 to 33 inches above the ground. The towing ring shall be
fabricated of l-inch round steel stock and shall form a ring with 3-inch
inside diameter. The towing assembly shall include two safety chains
with links formed of stock not less than required by DoT FMVSSR. The safety
chains shall be anchored to the drawbar and shall extend 24 inches beyond the
towing rings. The loose end of each chain shall be fitted with a safety hook or
a pin type clevis. The tandem axle ratings shall be not less than equal to the
load imposed on each axle, measured at the ground level when loaded with rated
payload. The tandem axle undercarriage shall be furnished with the
manufacturer's standard suspension system. Each component of the suspension
system shall have a rated capacity not less than that equal to the load imposed,
measured at the ground when the trailer is loaded with its rated payload. The
wheels and axles shall be equipped with brakes conforming to DoT FMVSSR. The
undercarriage shall be equipped with one or more retractable landing legs
located, as required, to prevent the unit from tipping when disconnected from
towing vehicles. The leg(s) shall be adjustable to maintain the unit in a
stable, level attitude during operation. Clearances shall preclude interference
between tires and any other part of the undercarriage under the operating
conditions specified herein.
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