sn: 141428 Lot

The LEFT JOYSTICK operates the drag or propel machinery, depending on the machine drive mode selected.

• When in the DRAG mode: moving the left joystick forward from its neutral position will result in the drag ropes “paying out” off the drum and the bucket will move away from the machine.

• Moving the left joystick rearward from its neutral position will cause the drag ropes to wind onto the drum and the bucket will “drag in” (move toward the machine).

• The Hoist Tension pushbutton, on top of the left joystick, applies reduced hoisting power to the hoist drum (to remove hoist rope slack and to hold the rigging off the bucket while dragging).

• When in the PROPEL mode: holding the left joystick in its FULL REARWARD position from its neutral position results in the shoes going through their walking step and propelling the machine in the direction away from the boom (front end).

• Moving the left joystick forward from its neutral position when in propel is done ONLY to back up the shoes as needed to place them in their top dead center location after a step has been completed.

THE MACHINE WILL NOT PROPEL TOWARD THE BOOM. Refer to WALKING MECHANISM, in this section.

The RIGHT JOYSTICK operates the hoist machinery (fore and aft lever movement). The hoist control is activated during DRAG mode.

• Moving the right joystick forward from its neutral position will result in the hoist ropes unwinding from the drum and the bucket will lower toward the ground.

• Moving the right joystick rearward from its neutral position will cause the hoist ropes to wind onto the drum and the bucket will be raised toward the boom point.

• The pushbutton on top of the joystick operates the air horns.

The SWING PEDALS are located on the floor in front of the operator. They are used to control machine rotation. Pressing the RIGHT pedal rotates the machine to the right. Pressing the LEFT pedal rotates the machine to the left.

The hoist and drag drives are speed controlled. This means that the further the joystick is moved fore or aft from its neutral position, the faster the drive will go. Practically full torque (or line pull) is obtained with the slightest movement of the joystick from its neutral position. Lever movement should be only enough to obtain the desired speed. Never move either hoist or drag joystick too far and then back it off. Always use a smooth, steady lever movement. “Jockeying” the joystick is not required and only results in machinery overuse and motor overheating.

The swing drive is torque controlled. This means that the further the footpedal is depressed, the more torque the swing drive will develop, thus increasing the machine’s swing-acceleration rate. Full swing speed is obtained at any position of the footpedal. THIS CONTROL SHOULD NOT BE

“JOCKEYED” DURING OPERATION.

PLUGGING THE MOTION

PLUGGING machinery motion is the use of motor torque, applied in the opposite direction of motor rotation, to slow or stop the motion. This process is recommended only on the swing motion on this machine. Plugging is accomplished when the operator engages the controller to swing the machine in the opposite direction of the current machine rotation. As the machine slows to a stop, the amount of plugging effort is gradually reduced to provide a smooth stop. Continued plugging effort will reverse the direction of the motion. Plugging rapidly dissipates the energy of heavy moving parts by regenerating into the power source. When the hoist or drag controllers are released with the machinery in motion, the motions automatically plug to slow the machinery. Only a small amount of plugging is required for the hoist and drag motions.

OPERATOR'S SEAT ADJUSTMENTS

The operator cab seat has options including a pneumatic suspension, lumbar support, and a seat heater. For additional information about adjustments to the operator’s seat, see PNEUMATIC SUSPENSION OPERATING INSTRUCTIONS at the end of this section.