OO-C-2821
3.5.2 Operational environments. The crane shall be capable of starting and
maintaining constant performance characteristics (as specified) herein under any
of the following conditions or combination of conditions:
Temperature conditions. In any temperature from -20 to +120
a.
degrees Fahrenheit (°F) (-29 to +49° Celsius (C)).
Elevation conditions. At any elevation from sea level (barometric
b.
pressure 29.92 inches mercury (101.3 kPa)) and a maximum ambient
temperature of 120°F (49°C) to 5,000 feet elevation and a maximum
temperature of 107°F (42°C).
3.5.3 Operational power requirements. The crane shall be capable of
simultaneously lifting and rotating a load equal in pounds (kilograms (kg)) to
the maximum rated loads at designated radii as specified in 3.5.1. The
completely equipped crane with basic boom shall be capable of traversing an
off-highway grade of not less than 20 percent. The crane revolving
upperstructure, completely equipped with basic crane boom and required
accessories, shall be capable of rotation speed of not less than 2 revolutions
per minute (rpm) for cranes with a maximum rating of 25 tons (22 680 metric tons
(t)) or less, and not less than 2 rpm for cranes of over 25-ton (22 680 t)
capacity. Cranes of 35-ton (31 751 t) capacity or less, completely equipped
with basic boom and required accessories, shall be capable of attaining highway
travel speeds of 40 miles per hour (mph) (64 kilometers per hour (km/h)) on a
1 percent grade. Cranes over 35 ton capacity, with necessary boom sections and
accessories removed to meet highway weight limitations, shall be capable of
attaining highway travel speeds of 35 mph (56 km/h), on a 1 percent grade.
3.5.3.1 Gradeability. The crane, without load and with mounted attachments,
shall negotiate a 30 percent grade on paved road without engine stall. If a 30
percent grade is not available, a draw bar pull test may be substituted for
travel up a 30 percent grade. The drawbar pull test shall simulate the downhill
force resulting from the crane weight on a 30 degree grade. The crane shall
pull with a force greater than the calculated downhill force without engine
stall.
3.5.4 Backward stability. When tested in accordance with 4.3.6, the crane
shall meet the following requirements:
With the longitudinal axis of the revolving upperstructure at 90° to
a.
the longitudinal axis of the carrier, the total load on all wheels on
the side of the carrier under the boom shall be not less than 15
percent of the total working weight of the crane.
With the longitudinal axis of the revolving upperstructure in line
b.
with the longitudinal axis of the carrier, in either direction, the
total load on all wheels under the lighter loaded end of the carrier
shall be not less than 15 percent of the total working weight of the
crane .
3.6 Construction. Where no specific construction requirements are specified
herein, the manufacturer's standard commercial practice shall apply. All parts,
components, and attachments shall be identical for each type and capacity of
crane furnished under any specific contract. No deviations will be accepted
without prior written approval of the contracting officer.
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