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how to identify the quality of the pole drilling machine

A: digging machines,www.fensuiji9.com/products/Semi-Finished-Parts.html

Earth auger is divided into portable digging machines, tractors digging machine, hydraulic pole digging holes to plant trees.
2: digging machines and quality difference between digging machines:
1: the quality of the portable hole digger difference is: the quality of the gasoline engine, gasoline engine, the transmission quality, the quality of the twist drill.
2: tractor planting quality difference is: digging machines - transm-ission drive - transmission way - bit material - bit materials such as the quality of the parts.
3: the telegraph pole on the quality difference is: digging machines pole digging machines method of digging holes/post/bracket/hydraulic pump, hydraulic horse/hydraulic oil cylinder/valve etc. The quality of the small parts