SPT & Wireline Rotary Core Test Drill Rig

The STR-155 is our 55hp drill rig for SPT soil test, wireline core testing and rotary drilling. It is designed for the engineer that requires an easily maneuverable and powerful SPT & coring soil investigation rig.

The STR-155 allows the engineer to drill faster and deeper than any other test rig in its class and besides SPT, it can do augers, micro piling, rotary drilling and wireline core sampling. The rig comes complete with a mud and water pump, manual or automatic SPT hammer system, retractable mast, dual winches for wireline drilling, and a compact and incredibly powerful 4 speed gearbox drill motor with a built in heavy duty wet swivel.

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  • 55 hp (41 kW), Yanmar tier 4 compliant, turbo charged diesel engine
  • Water cooled
  • 1.996 liter displacement (1995 cc)
  • Radiator cooling system
  • 12 V electric start
  • 2300 rpm
  • Direct injection
  • Emergency stop button
  • Rpm gauge
  • Oil pressure gauge
  • Oil level light

Hydraulic System

  • Hawe hydraulics power unit
  • 38 gpm (143 lpm) max combined hydraulic flow
  • Max 3000 psi (206 bar)
  • Load sensing variable displacement axial piston pump
  • Feather touch controls
  • Oil cooler
  • In-tank oil filter

Track System

  • Stationary track system (300 mm wide 1727 mm long - 11.8” wide 68” long)
  • NACHI 3B track motor with automatic brake system
  • Built-in grease filled tensioning arm and spring


  • Chain driven mast
  • V-Rollers
  • Tilt rotate for travel
  • Standard mast 5 ft (1.5 m) stroke or extended mast 10 ft (3 m) stroke

Pipe Clamp

  • Single pipe/rod bottom clamp
  • Size capability from 1.5” to 6” (Other sizes available)

Telescopic SPT Tower

  • Telescopic SPT tower
  • 16 ft (4.8 m) max height (longer travel available)
  • Dual pulley system - SPT rope pulley and wireline pulley. Tower counterbalance hydraulic locking system

Mud Pump

  • Moyno 3L6 (or equivalent) continuous flow stator / rotor style mud pump
  • Up to 225 psi (15.5 bar)
  • 50 gpm flow (189 lpm)
  • Independent hydraulic motor
  • Quick coupling
  • Mounted on drill rig frame

SPT Hammer System

  • Rotary capstan system for manual SPT hammer (SPT hammer sold separately)

Leveling Outriggers

  • 4 hydraulic level outriggers with independent controls

Drill Motor - Rotary Gearbox MS-400

  • Gear 1: 902 rpm at 357 ft lbs (484 Nm) torque
  • Gear 2: 451 rpm at 714 ft lbs (968 Nm) torque
  • Gear 3: 225 rpm at 1427 ft lbs (1934 Nm) torque
  • Gear 4: 113 rpm at 2855 ft lbs (3870 Nm) torque
  • Built-in heavy duty wet swivel (see bellow)

Heavy Duty Wet Swivel

  • Top intake
  • 18,000 lbs (8,160 kg) load capacity
  • Quick change connectors (AWJ, AW, BW, BQ, NW, NQ, HW, HQ, PW, PQ) others available
  • Automatic spring floating system

Lifting Winch

  • 4,500 lbs (2,041 kg) lift capacity
  • Planetary gear
  • 10 ft/sec travel speed
  • Balance weight and locking hook
  • ¼”- ½” (6-12 mm) rope diameter

Second Winch

  • For wireline operations
  • 1,000 lbs (453 kg) lift capacity
  • 20 ft/sec travel speed

Fuel Tank

  • 13 gallon (50 liters) fuel tank with fuel sending sensor

Hydraulic Tank

  • 55 gallon (208 liters) hydraulic oil tank with built in site level glass

Depth Capacity

  • 250-325 feet of depth


  • Full function remote control for all drilling and driving operations
  • Built-in rod and casing rack
  • Automatic drop hammer 140 lbs (63 kg)
  • Manual drop hammer 140 lbs (63 kg)
  • Dual pipe clamp with breakout
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