4300  138,000 ft-lbs  (187 knm) 

truck or crawler mount

LINEPULL 40,000 lb (178 kN)

DEPTH 160 ft (56 m) 

WEIGHT 107,000 lb (48,000 kg)*


The 4300 represents all of the defining features that make Watson rigs the most productive in the industry, while adding the benefits of a movable rotary design. Still a one piece haul or truck mountable, this machine is tougher, faster and simpler resulting in a rig that is easier to learn and maintain.  


Never compromising our core commitment to drilled shaft production, the 4300 adds "up the mast" capabilities such as sectional casing, cluster drills, and CFA without sacrificing performance.  *Depending on configuration.


Click here for more details (printable pdf)


1-800-927-8486 or email sales@watsonusa.com

4300 key advantages


  • SINGLE LOAD CRAWLER

    Set up time is minimal without having to assemble or disassemble to transport.  This is achieved by hauling the Kelly bars in place on the mast in a folded position.

  • TOP APPLIED KELLY CROWD SYSTEM

    Watson's top crowd system applies the downward force to the top of the kelly rather than through a rotary/bar locking system. The controllable outer bar can drill the full length without moving the rotary eliminating the need lock the outer bar.  The wear and tear on the rotary from crowd forces is eliminated while also allowing the operator to drill straighter holes.  

  • interchangeable SQUARE friction OR ROUND LOCKING BARS

    Heavy duty Kelly bars made from high strength alloy steel are standard on Watson rigs. The 4300 has interchangeable inserts to allow for either square friction or round locking to suit your drilling needs.  

  • CONTROLLED FREEFALL SINGLE LAYER WINCH

    Watson's proprietary controlled freefall winch achieves the performance of other freefall systems with even greater control over the tool.  Paired with a large diameter grooved drum and a rear roller, wire rope management is best in class.

  • tri-drive HYDRAULIC ROTARY SYSTEM

    The triple drill motor design achieves max torque and max spinoff without clutches or gear shifting.  The spindle passage is the largest in the industry allowing for more kellys.

  • ROTARY TRAVEL

    Dual positioning cylinders provide 25 feet of variable height to give rotary clearance and easy setup.

  • LARGER TOOLS

    Clearance for a 9 foot tool around the track corners and up to 5 ft up the mast.

  • BETTER VISIBILITY

    Our Swing-out cab gets you optimal visibility of hole, winches, tools, off side and increases safety.

  • PROVEN hydraulic RELIABILITY

    Time tested pilot controls provide superior control and feel, easier diagnostics and with fewer headaches and obsolesence than electronics.  Manual levels on all section allow for even easier diagnostics or override.

  • balanced CRAWLER MOUNT

    Triple grouser expandable undercarriage with a square foot print for 360 deg stability. 9'10" retracted to 13'1" expanded. Clearance around tracks for a 9 foot tool.

  • SERVICEABILITY

    Open architectural layout resulting in easy access for service and repair.

  • PATENT PENDING ROUND LOCKING BARS

    Watson has always built the heaviest duty round locking kellys in the business. The latest generation incorporates patent pending features designed to eliminate the hassle of finding locks while vastly extend the time between servicing. With 4x the torque surface and 12x the crowd surface, customers are able to go years between refurbishing bars. Additionally, open bottom design allows easy drainage for slurry drilling. Call for details.

Typical applications

The 4300 provides the versatility needed for a wide range of applications from Utility Transmission to heavy commercial applications. 

  • Bridge Construction
  • Transmission lines
  • Elevator shafts
  • Commercial
  • Rock drilling

4300 WATSON

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