... durability, high efficiency and widely working environment.Traction system:tripod traction.Turning system: centerless turnplateSuspension system:leaf springHydraulic unloading system:quick change coupler ,hydraulic tubing anchor ... ,oil hydraulic cylinderBrake sestem: scroll collector , quick change couplerEletirc system: connected with 7core spiral cable swift connector, auto-circuitry of ...