Auxiliary Hoist. The auxiliary hoist provides power for all
load raising and lowering operations when the auxiliary
boom nose is installed. Two hydraulic motors drive the
hoist drum by means of a planetary gear reduction
system. A disc brake is also an integral part of the hoist
assembly. It operates automatically when the control
lever is in neutral position.
Control Lever Lockout System. The control lever lockout
will automatically deactivate various control directions or
functions which would tend to hasten an impending
overload condition of the crane or two-block direction or
condition. The system consists of a solenoid controlled
air cylinder, and the associated linkage and rods to
lockout functions that may worsen the condition, i.e,
boom down, telescope out or hoist up; therefore, when
control lever lockout occurs, the control levers can only
be moved in a direction that will alleviate the condition.
Lockout occurs when the solenoid is deenergized,
closing an exhaust port and allowing air pressure to be
supplied to the cylinder piston. Lockout is removed when
the solenoid is energized, exhausting the air and allowing
spring pressure to retract the cylinder piston.
Swing/Boom Warning System. The swing/boom warning
system provides a visual and audible warning to the
operator that the boom is not elevated sufficiently to clear
the engine hood when swinging the boom over the rear.
The red warning light is located in the LED alert display.
The light and buzzer are controlled by two micro-
switches electrically connected in series. One switch
senses boom elevation and the other switch senses
boom position in relation to swing. If boom
elevation is below 7.5 degrees and swing is initiated, the
warning indicator will illuminate and an alarm will sound
when swing exceeds 90 degrees in either direction from
directly over the front.
The steering system uses hydraulically controlled
steering cylinders mounted to the axles. For maximum
maneuverability, the front and rear axles are drive and
steer (axles). Two-wheel drive or four-wheel drive can
be selected. The front axle has full power steering. The
rear axle utilizes full hydraulic control and is operated
independently of the front steer via a control lever
adjacent to the steering wheel.
An electric motor driven, hydraulic pump provides
emergency steering hydraulic pressure.
The engine compressor provides the air supply to
operate the air service brakes, parking brakes, engine
throttle, and transmission range shift and rear axle
disconnect. Air flow is transmitted from the carrier frame
to the superstructure through a swivel located at the
center of rotation.
The electrical system is a 24-volt operation and starting
system, consisting of an alternator and four lead-acid
batteries, which are series-parallel connected. The
system is single wire-ground return type utilizing the
machines structure as ground.