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Disassembling bitzer screw compressor HSN85 After venting compressor open suction and discharge service valves Remove check valve complete Drain oil by opening sealing plug in suction, filter and discharge side Remove suction side housing cover and suction side gas filter Remove suction gas filter Open hexagon head screw with metal filter Open sealing screw and remove parallel pin Remove terminal plate Remove winding Open grooved nut by special tools Remove rotor Remove discharge cover Remove oil pressure switches Remove oil filter complete Filter set Open the oil Open hexagon head screw (sliding piston keeper) Remove piston from cylinder Open piston rod Remove discharge temperature sensor Remove grooved nuts by special tools Remove solenoid of capacity control Remove regulator flange Remove discharge flange cover Remove rotors and rotors keeper Pull out slider Pull out rotors from bearing and flange