A two-section trapezoidal boom 19-33 feet (5.8 -10.1 m) is provided. Boom
elevation is accomplished by a single, double-acting hydraulic cylinder with
integral holding valve. The boom elevation range is from 0 to 80 degrees. A
single telescope cylinder provides telescoping power for boom extension.
The hoist provides power and speed for all load raising and lowering
operations. A gear type hydraulic motor drives the hoist drum by means of a
planetary gear reduction system. A metallic disc brake is also an integral part
of the hoist assembly.
The outriggers are the cantilever type and are controlled from the cab. They
are positioned to provide a rigid four point platform (outriggers extended and
set) capable of supporting the machine and its maximum load capacity.
Integral holding valves, floats and oversize floats are standard equipment.
The electrical system is 24 VDC for operation and starting. The system
consists of two 12-volt batteries (wired in series), an alternator, starting
motor, lighting systems, warning devices, gages, and indicators. The system
is single wire-ground return type utilizing the crane's structure as ground.
ANTITWO-BLOCK/CONTROL LEVER LOCK OUT SYSTEM.
The antitwo-block system provides a warning to the operator in preventing
two-block conditions. The system consists of antitwo-block switch, a relay,
a buzzer, a warning indicator light, and the associated wiring. The switch is
held in the closed position by a weight suspended on a chain from the switch.
The closed switch maintains the relay energized, which silences the buzzer
and prevents illumination of the indicator light. As the hook block comes
closer to the boom tip, the weight is contacted and the switch is allowed to
spring open. This action deenergizes the relay, which sounds the warning
buzzer, and illuminates the TWO-BLOCK indicator light on the left side of the
front console. In addition to providing a warning, this system also activates
the control lever lockout system.