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Ground Support Equipment
The Entwistle Company
MB-4 Tow Tractor


MB-4 Tow Tractor front view

The MB-4 is a medium size tow tractor designed and built by Entwistle for the U.S. Air Force. The tractor uses rugged, off-road drive line components from commercial sources, and the structure is designed by Entwistle to provide essentially infinite life under the most severe operating conditions. The MB-4 provides a drawbar pull of over 14,000 pounds.

  • Entwistle Model 9330
  • NSN 1740-01-389-4127
  • Production - Over 300 tractors


MB-4 Tow Tractor rear view

MB-4 Tow Tractor Control Panel


Specification Data
  • 14,000 (62,000 Newtons) drawbar pull (nominal)
  • Cummins diesel engine power
  • Automatic four-speed transmission
  • Four wheel drive
  • Two speed transfer case with inter-axle differential
  • Heavy duty, off-road axles
  • Selectable four wheel, two wheel, or crab stee
  • 15 foot (4.5 meter) turning radius
  • 25 mph (40 kph) maximum speed
  • Trailer air provisions (optional)
  • 20,000 pounds (9,100 kg) gross vehicle weight rating


The Entwistle Company