Water Well Drilling Rig. Tophead: Gear box – through spindle, 2-speed. Speed 1: 0-75 with 1,510 foot-pounds. Speed 2: 0-150 with 753 foot-pounds. Pullback: 15,000 pounds. Pulldown: 11,000 pounds. Mud pump: 3x2 centrifugal mounted on-board, with other mud pump options available. Crawler- and trunk-mounted options available. For more information, contact us at 903-669-1602 or sales@rockbuster.com. rockbuster.com