SUPERSTRUCTURE CAB CONTROLS AND INDICATORS.
The crane is equipped with a Load Moment
Indicating (LMI) system as an aid the operator, refer
The following paragraphs describe the controls and
indicators located in the superstructure cab. The
numbers in parentheses ( ) represent the index
Any reference made to left, right, front, and rear when
describing locations from the superstructure cab is to
be considered as viewed from the superstructure
operator's seat with the boom directly over the rear of
Cab Circulating Fan (1). The fan is located on the left on a mounting bracket above the
window frame. A swivel allows the fan to be rotated. The fan is controlled by a switch on
Turn Signal Lever (2). The lever is located on the steering column. Moving the switch
handle down causes the left turn signals to flash. Moving the switch handle up causes the
right turn signals to flash.
Four-Way Flasher (3). The flasher is located on the steering column just below the turn
signal lever. Pulling the switch causes all four turn signal lights to flash. The lights will
continue to flash until the switch is depressed.
PUSH FOR TELE/PULL FOR TILT Steering Column Tilt/Telescope Lever (4). The lever
is located on the left side of the steering column below the turn signal lever. When pulled,
the lever allows the operator to tilt the steering column to one of six different positions.
When pushed, the operator can move the steering wheel in or out for ease of operation and
Foot Throttle Pedal (5). The pedal is the right most pedal on the cab floor. The pedal is
connected to a valve which pneumatically actuates the throttle cylinder on the engine to
control engine speed.
Positive Swing Lock Handle (6). The handle is located on the right side of the operator's
seat beneath the control armrest. The purpose of the positive swing lock is to secure the
superstructure, so that it cannot swing during craning. When the handle is pulled up, the
positive swing lock is disengaged and swing can be accomplished. Pushing down on the
handle engages the positive swing lock assembly in the gear teeth of the swing gear. The
handle is adjusted to require approximately 45 lbs (20.4 kg) of force to move the lever into
the engaged position.
Hoist Rotation Indicators (7). The indicators are located in the top of the LIFT/MAIN and
SWING/AUXiliary hoist control levers. Each indicator consists of a solenoid which produces
a mechanical thump in response to a signal transmitted by an electronic pulse generator
attached to each hoist frame. A thumping signal is felt by the operator's thumb when the