4WNA & 4WFA – Truck-Mount Winches


4WNA-1000 1500-meter Winch

Mount Sopris 4WNA and 4WFA Truck-Mounted Winches are rugged, field-tested logging hoists capable of positioning a geophysical probe or other tool in a borehole. They are designed to be mounted to a truck and can haul equipment loads up to 272 kg (600 lbs) at rates between 0 and 90 m/min (0 to 300 ft/min). These winches are optimal for boreholes between 1000 and 1800 meters (3280 ft to 5900 ft) in depth and support a wide variety of cable types.

Features & Benefits

  • 4WNA includes a 1HP motor, 4WFA includes a 2HP motor
  • High precision measuring wheel and depth encoder
  • Cable is automatically wrapped on the drum in even layers through the level wind mechanism
  • Tension display and load cell with digital depth measuring system
  • Includes cablehead, remote control, disc brake, and 2 speed drive.
  • Equipped with slip rings and connectors, through which surface instrumentation can communicate with the probe
  • Motor is controlled by a motor speed controller, which allows the user to vary the logging speed

4WFA Winch with 2HP Motor

The 4WNA/4WFA Winches and Winch Control are designed for use with Mount Sopris logging consoles and a field laptop to achieve a complete logging system.  These winches can also be mounted on skids for remote access applications or within custom designed logging vehicles.

Contact Us for information about using our truck-mounted winches for your project.

3WCA Winch Depth-Tension- Speed Controller

Technical SpecificationS

Motor: 1 or 2 HP, SCR type
Controller: SCR controller, with 10 Amp current limit
Depth Encoder: BEI Model H20 (200 pulses/turn) standard, others available.
Wireline Tolerance: Supports Single Conductor, Coaxial, and Multi-Conductor Cables
Winch Size: 114 x 52 x 66 cm (45″ x 20.25″ x 26″)
Winch Weight without Cable: 110 kg (242 lbs)
Cable off-axis Tolerance: 20° left, 20° right, 15° down, 90° up


4WNA Max Speed Max Continuous Load Max Instantaneous Load
Low Speed 9 m/min (30 ft/min) 272 kg (600 lbs) 363 kg (800 lbs)
High Speed 27 m/min (90 ft/min) 113 kg (250 lbs) 136 kg (300 lbs)


4WFA Max Speed Max Continuous Load Max Instantaneous Load
Low Speed 30 m/min (100 ft/min) 272 kg (600 lbs) 363 kg (800 lbs)
High Speed 90 m/min (300 ft/min) 113 kg (250 lbs) 136 kg (300 lbs)


Temperature: -20 to 50 Deg. C
Approximate Shipping Weight:

     * 1000 m (3281 ft) of 3/16″ (4.76 mm) cable: 324 kg (715 lbs)
     * 1800 m (5905 ft) of 3/16″ (4.76 mm) cable: 340 kg (750 lbs)
Shipping Dimensions: 117 x 72 x 74 cm (46″ x 28.5″ x 29.25″)


4WNA/4WFA Operations Manual

3WCA Winch Control Operations Manual

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