MIL-P-17861F
less than 2 inches in diameter, near the ends of each skid shall be acceptable
for pump sizes up to 20M and 3 inches in diameter for larger size units in lieu
of pulling attachments. The pump and engine shall be mounted to the skid base
in a manner to permit ready removal and replacement of either or both
components . Skid mountings shall be designed and constructed to permit pulling
(skidding) the units over dry, unpaved surfaces at speeds up to 5 miles per hour
(mph) without damage to the skid, or damage to, or misalignment of any
components mounted on the skid.
3.6.3 Wheel mountings. Wheel-mounted pumps, two- and four-wheel vehicular
towed classes 2A, 4, and 4A shall have the tire and rim ratings conforming to
the TRA Yearbook for the type and size of tires furnished. Tire and rim sizes
shall be the same for all wheels. Tires for vehicular-towed pumps shall be tube
or tubeless type with highway tread, and shall be of rated capacity at least
equal to the load imposed on each tire, measured at each wheel at the ground.
Tires for vehicular-towed pumps shall be not less than 100 level quality and
shall be of domestic make. When tube type tires are furnished, tubes shall be
heavy-duty type, and shall be of proper size for the tires furnished.
3 6 3.1 Manually-propelled (class 2). Class 2, wheel-mounted,
manually-propelled pumps shall have wheel mounting requirements as specified in
table IV. Class 2 mountings shall consist of a two-wheel, rubber-tired cart
with a push bar or handle, and a supporting leg. Tires shall be of the
semi-pneumatic industrial type, or pneumatic wheelbarrow type in accordance with
table IV (see 6.2). Tires and wheels shall be commercially rated to withstand
speeds up to 10 mph when supporting the gross weight of the pump unit.
3.6.3.2 Vehicular-towed (classes 2A and 4) wheel-mounted. Wheel mountings
for class 2A and class 4 pumps shall be designed for vehicular towing 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. The towing ring shall be fabricated of l-inch round steel stock, and
The towing assembly
shall form a ring with 3-inch
inside diameter
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 ring. The loose end of each chain
shall be fitted with a safety-type hook or a pin-type clevis. Axle ratings
shall be at least equal to the load imposed on each axle, measured at the
ground, with wheeled-undercarriages loaded with rated payload. Class 2A,
two-wheeled under carriages shall be equipped with one or store retractable
landing legs located, as required, to prevent the unit from tipping when
disconnected from the towing vehicle. The leg(s) shall be capable of
maintaining the unit in a stable, level attitude during operation. Class 4
wheeled undercarriages, applicable to sizes 90M and 70MT, and larger rated pumps
on an optional basis shall be furnished with four rubber-tired wheels and
automotive type steering. Clearances shall preclude interference between tires
and any other part of the assembly when making turns and under the operating
conditions specified herein.
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