Swing that accelerates slowly, drifts after the lever is released or lets the upper structure creep on a slope usually means the M5X130CH9 Excavator Hydraulic Swing Motor is worn. Internal bypass past the pistons and tired brake plates cut usable swing torque. RITO supplies this M5X130CH9 Excavator Hydraulic Swing Motor (nominal 130 cc/rev) for the 20-25 ton class excavator range to restore crisp swing response.
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