OO-C-2821
a single, fixed position providing maximum efficiency for general-purpose crane
operations. The carrier shall be the conventional crane type, with half cab
mounted on the left side over the front axle, and carrier engine mounted over or
forward of the front axle. Carriers with dual front axles shall have
independent rotation of outer and inner wheels to eliminate wheel drag and tire
scuffing.
3.8.1 Powered outriggers. Hydraulically powered outriggers shall be
provided and shall be capable of being set and retracted independently. The
total setting time of the outriggers, in a normal setting position on level
ground, shall not exceed 2-1/2 minutes. The outriggers shall have sufficient
strength to provide full stability, under all loading conditions, including the
ability to raise the crane off the ground from travel position when necessary to
compensate for ground surfaces having irregular contours. When required by
design, suitable warnings shall be conspicuously displayed instructing operating
personnel as to the location and operation of lockout valves or similar devices
employed for the purpose of shutting off oil supply. Hydraulic cylinders shall
be enclosed within outrigger boxes except that vertical jack cylinders of
outriggers, design for horizontal and vertical operation, shall be separately
enclosed. Outrigger boxes extending beyond the overall tire width of the crane,
with outriggers fully retracted, shall be remountable to permit maneuverability
or for dragline operation. Suitable provisions shall be made for storing the
floats when not in use. A device to accurately determine when the crane is
level shall be installed in a position convenient to the outrigger controls.
When specified (see 6.2), a front mounted outrigger shall be installed.
3.8.2 Tires and rims. The rims and tires provided as crane equipment shall
all be the same size and shall conform to the recommendations to the TRA
applicable to the operation and load. The tires shall be of the tube or
tubeless type of the tire manufacturer's first line grade. Each tire shall have
load-carrying capacity sufficient for the loading imposed by the operation.
3.8.3 Carrier brake system.
3.8.3.1 Service brakes. Air-actuated service brakes complying with DoT
Federal Motor Carrier Safety Regulations when applicable, shall be furnished.
The service brakes shall be capable of controlling and holding the crane, with
basic boom, on a 20 percent grade. On cranes of less than 35-ton (32 t) rated
capacity, the service brakes shall be capable of stopping the crane within 40
feet (12 meters (m)) from a speed of 20 mph (32 km/h) on dry, hard,
approximately level road surfaces, free from loose material, when tested in
accordance with 4.3.10. On cranes of 35-ton (32 t) capacity or more, the
service brakes shall be capable of stopping the crane within 50 feet (15 m) from
a speed of 20 mph (32 km/h) when tested under the same conditions in accordance
with 4.3.9.
3.8.3.2 Parking brake. The carrier shall be equipped with a heavy-duty,
spring-set, air-release parking brake capable of holding the crane, without full
load and with basic boom, facing either direction, on a 20 percent grade for at
least 20 seconds without slippage, when tested in accordance with 4.3.9. A
spring-loaded safety feature mechanism shall be provided for the locking of one
or more axles in the event of air system failure.
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