... control assy, slewing control assy, multiplex valve control assy, front control assy, slewing control assy, front control assy, slewing control assy , drive sleeve , multiplex valve control assy , magnetic valve ... assistant -hook support, beam spport, lower throttle control, level meter, oil pump unit, drive axle ... joint, center slewing joint, stay leg control system, cover plate assy, hydraulic oil ...