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DGY series pipelayer uses the special designed chassis which has rigid structure , longer and wider track and hydraul-mechanical technology. Working sets is hydraulically driven to realize 3 actions: up and down of the hook, swing of the boom and adjustable counterweight. Independent hydraulic winches are used to drive the boom and hook. Boom is rugged, welded box-section, constructed on fine -quality steel. Moment limiter, height limiter and boom limiter are equipped to inspect and control the working status of the pipelayer. The pipelayers jiggle performance is good and has the emergency free-fall function on load, DGY series pipelayers are important equipments in oil and natural gas pipeline construction which mainly used for the pipes laying, linking and loading.