1-10
Boom:
Standard:
High strength steel construction, equipped with bearing pads for efficient support
and extension. Double-acting hydraulic cylinders extend and retract the second and
third boom sections. Double runs of high strength leaf chain extend and retract the
fourth section. The second stage extends first and retracts last, controlled by
sequencing valves in the boom. The third and fourth sections extend and retract
together proportionally, controlled by chains. The extension system is equipped
with a holding valve. Twin, double-acting hydraulic cylinders control the boom
elevation and are equipped with direct connected holding valves. Boom angle
indicator is provided on left side of the boom. Boom tip sheaves are provided for
four-part line.
Boom
Hoist:
Turret-mounted, planetary gear winch, is hydraulically powered to provide a
bare-drum line pull of 13,100 pounds (5940 kg) and a speed of 185 feet per
minute (56m/min). Line speed of the fourth layer on the drum is 240 feet per
minute (73 m/min). Drum diameter is 9.75 inches (24.8 cm), length is 16 inches
(40.6 cm). Includes 350 feet (107 m) of 9/16 inch (14 mm) wire rope, 6 X 36-
EIP-RRL-IWRC, 33,600 pound (150 kN) breaking strength.
Downhaul Weight and Hook:
Downhaul weight and 10,000 pound (4540 kg) swivel hook to use with existing
wedge socket on 9/16 inch (14 mm) load line. Specially designed to work with
the anti-two-block system and to clamp the dead end of the rope. Weighs 180
pounds (82 kg)
Boom
Rotation:
Heavy-duty ball bearing with external teeth supports boom. Rotation is by
hydraulic motor and compound planetary gear drive. A spring-applied
hydraulically released brake and an over-running load valve are provided.
Hydraulic centerpost and electric slip rings allow continuous rotation.
Anti-Two-Block
Device:
Designed to prevent damage to hoist rope and/or machine components from
accidentally pulling sheave block or downhaul weight against boom tip. Consists
of pivot arm at boom tip that is moved upward by sheave block or downhaul
weight as hook approaches boom tip. Pivot arm actuates electric switch that is
connected by cable reel to solenoid dump valve in hydraulic circuit. This valve
will dump the HOIST RAISE, TELESCOPE EXTEND, BOOM LOWER circuits.
No other circuits are affected. These circuits are returned to normal operation
by lowering the load to a safe resting place with hoist or by retracting or raising
boom to a shorter load radius. Key-operated, momentary override switch
located under dashboard.
Rated
Capacity
Limiter:
Operational aid that warns operator of impending overload with audible and
visual signals. Has read-outs for load, boom angle, boom length and load
radius. In the event of an overload, dumps the following boom functions:
HOIST RAISE, TELESCOPE EXTEND, BOOM LOWER. These circuits are
returned to normal by lowering load to a safe resting place with hoist or by
retracting or raising boom to a shorter load radius. There is also an override
button on the RCL control panel and an override switch under the dashboard.
Summary of Contents for RT-300-2G
Page 6: ...1 2 DIMENSIONAL DATA Courtesy of Crane Market...
Page 7: ...1 3 RT 300 2G TURNING DIMENSIONS Courtesy of Crane Market...
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Page 33: ...2 17 CAPACITY CHART FOR RT 300 2G Courtesy of Crane Market...
Page 34: ...2 18 CAPACITY CHART FOR RT 300 2G METRIC Courtesy of Crane Market...
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