... diameter:50cm work speed: within 1min/hole Pit Boring Machine Tractor digging machine design full hydraulic,High working efficiency, Pole Erection ... : Loess layer,argillic horizon ,Sandy soil with gravel,Weathering of rock and soil,Frozen layer not applicable of geological ... staff: 1 personApplication: Tractor Digging Machine is widely use in Pole Erection Machine digging hole,drill,bore,pile,Solar ...