BI616938
Bucyrus International, Inc. 8750 Walking Dragline
WALKING Some preparations are required before moving the dragline. Its travel path must be adequately prepared. See the previous sub-section GROUND PREPARATION. The bucket must be positioned to suit the ground conditions. The machine must be rotated so its rear faces the desired direction of travel. Provision must be made for safely and correctly handling the trail cable during the move. DO NOT USE A WALKING SHOE TO PULL OR MOVE THE TRAIL CABLE to avoid damaging the trail cable. The position at which the bucket is carried when the machine is propelled contributes considerably to the walking operation and is dependent upon the condition of the ground. When traversing firm, level surfaces, the bucket should be suspended from the boom point approximately 1/3 the dump radius of the machine. The same position is used when propelling up a ramp. When propelling down a ramp, carry the bucket below the boom point. In all cases, the bucket should be high enough so that it will not touch the ground during a walking step. “Heeling” the bucket while walking is done by letting the rear of the bucket contact the ground during the step and slide along when the tub slides rearward in the direction of travel. As the tub is lowered to the ground, the bucket is picked up as the boom point raises. THE BUCKET SHOULD NOT BE JERKED OFF THE GROUND. Heeling is useful while traversing dry, sandy, or powdery soil conditions to reduce the ground pressure under the sliding area of the tub and stop soil build up behind the tub’s front edge or to avoid shoe slippage on the ground. Each operator will learn through experience where to carry the bucket while propelling to suit the ground conditions encountered. The above are general guidelines for any operator to follow initially for positioning the bucket for walking. When all is ready for the machine to be moved, transfer the machine control from DIG to PROPEL mode. Refer to TYPICAL START-UP in this section for the procedure. Sound the signal horns to indicate the machine will propel. IMPORTANT NOTE: The operator should check that the drag machinery is inoperative and that the transfer to PROPEL is complete. This is done by moving the left controller (drag) slightly forward off neutral and then back to neutral to see if the drag or the propel machinery moves. This check can avoid inadvertent damage to the boom or front end in case the drag motion is still activated when the controller is moved full forward to take a step.
Feb. 2007
63
Manual No. 10348 - Rev. 2
