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Arm connected to the turret, 3-stage telescopic structure, PRM uses quadrilateral rounded cross-section, made of nylon between the working arm RAM Guide. Telescopic cylinder directly towards the second arm, third arm in the chain expansion mechanism under the action of and the second arm synchronous telescoping. Boom luffing cylinder-driven change, all articulated self-lubricating bearings, lower maintenance requirements, all points requiring lubrication are equipped with filler, can be easily maintained.