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Second – hand excavators can be classified by purpose into general – purpose type (used for conventional operations such as earthwork projects), mining type (adapted to heavy – load environments in mines), and municipal type (suitable for operations in narrow spaces). By power type, they are divided into diesel type (widely used) and electric type (environmentally friendly, suitable for indoor use). By tonnage, they are categorized as mini (less than 5 tons), small (5 – 20 tons), medium (20 – 40 tons), and large (more than 40 tons). When purchasing, pay attention to working conditions, maintenance records, etc.
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