OO-C-2774
superstructure in any desired position shall be provided. The manual swing lock
or brake controls shall be located within reach of the operator while seated.
3.8.5 Main winch capacity. The main winch shall have sufficient capacity to
make maximum rated lifts with shortest boom length and with the length of rope
installed on the winch as specified in 3.9.4
3.8.6 Safe load capacities chart. A permanent chart indicating all the safe
load capacities on each boom reach and radii at 360° rotation, with and without
outriggers, shall be posted in the crane cab near the operator. The safe load
capacity chart shall reflect the manufacturer's standard commercial rating for
the size and model crane furnished, and not be limited to the minimum required
capacities specified.
3.9 Crane. The crane assembly, designed for the carrier mount, shall
consist of a fully revolving superstructure with hydraulically operated
telescoping type boom, a main winch with wire rope, hook block, cab controls,
and necessary accessories.
3.9.1 Superstructure. The superstructure shall be mounted on the carrier to
insure full 360° working range and designed to withstand the forces caused by
lifting, swinging, and traveling with the safe loads.
3.9.2 Boom. The boom shall be of alloy steel and of the hydraulically
operated telescoping type, consisting of a base section and sliding section(s).
All extensions, retraction, and elevations of the boom shall be accomplished by
hydraulic controls from the operator's cab without manual assist. When
specified (see 6.1), for longer boom lengths, boom shall be hydraulically
extended and retracted, and may be automatically synchronized, and/or power
pinned. When specified (see 6.1), an auxiliary point sheave shall be provided.
3.9.2.1 Boom drift . Boom drift, the vertical dropping of the boom due to
inadvertent retraction of the boom hoist and/or boom extension cylinders, shall
be kept to a minimum. Drift shall take place in gradual, imperceptible speeds
or degrees. The crane load, under all operating conditions, shall not drop in a
sharp or sudden manner at any time during crane operation.
3.9.3 Hook block. The rated capacity of the crane hook block shall be not
less than than rated capacity of the crane for which it is furnished. The hook
shall be of the forged steel, swivel type with an ultimate strength of four
times the maximum safe-rated load and shall include a safety latch on the hook.
The block and hook shall have adequate weight to insure payout of the cable
without load on the hook in any position. Block assembly shall be provided for
attachment to the hoist cable for not less than two-part line. Means shall be
provided to secure hook block while traveling. The hook block furnished shall
permit disassembly for visual and nondestructive testing. The hook shall not be
painted. The swivel and hook overhaul weight shall be furnished.
3.9.4 Rope. Load hoist rope(s) shall be extra improved plow steel, IWRC
with a safety factor not less than 3.5. The manufacturer's standard length of
wire rope shall be furnished. The contracter shall provide a signed
certification with each crane identifying the crane serial number, wire rope
manufacturer, type of wire rope construction, type of wire rope material, and
the minimum breaking strength of the wire rope provided.
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