Double Drum Walking Tractor Machine Winch Application: Fast Speed Double Drum Winch Tractor For Pulling and Lifting During Tower Erection is applicable to pull no-twist wire rope. Features: 1, Four gear,forward gear and reverse gear. 2, Double drum,seven groove,protect the wire rope speedy and convenient. 3, The grinding of walking tractor is reformed from 12 type walking tractor. Technical Parameters Item number Model Ground wheel-base(MM) Power(HP) speed(RPM) Travel speed(KM/H) Outline Clearance(MM) size(MM) 9171 12-A…