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Model 120KDT

Pile-Top Drill Unit for Conventional Drag Tool Drilling

General Specifications

Power Unit

  • 425 HP Hydraulic Power unit w/ Diesel Engine, 140 gpm x 3,500 psi main pump with 4-way open-spool control valve, 25 gpm x 3500 psi auxiliary pump w/3-section, 4-way closed spool control valve, hydraulic reservoir, fuel tank, full sheet metal enclosure and remote control system

Drive Motors

  • 2 each fixed-displacement Hydraulic Motors with maximum torque output of 21,980 ft-lbs and speeds up to 120 rpm

Rotary Table Final Drive

  • 3.30:1 ratio, Spur Gear Drive, 26-inch opening

Kelly Bar Drive

  • 13 1/2" Roller Drive mounted on the underside of the Rotary Table. Equipped with "Dog-bone" rollers – capable of passing 16" O.D. Tool Joints - and Kelly Bar wiper seals (to prevent drilling fluid build-up on rotary)

Hydraulic Kelly Slips

  • Dual-ram, Hydraulic Slip Plate to catch Kelly Bar – allows Kelly Bar to lift the Pile-Top Rig during placement and removal from Pile. This system allows for quick-release on the Barge Deck or Ground, for Kelly Bar removal and lay-down

Hydraulic Pile Gripper

  • 4-way Hydraulic Pile Gripper System secures Drill Unit to Pile, and creates torque reaction base

Power Unit Counter Weight

  • 3 1/4" steel plate slabs - stacked and staggered for weight variance


  • 58,000 lbs. with power pack and counterweight
  • 35,000 lbs. without power pack and counterweight
*Specifications subject to change without notice.

Theoretical Performance of 120KDT

Rotary Torque Rotary Speed
120,000 ft-lbs 12 rpm