Air Cleaner and Crankcase Ventilation System Air Cleaner and Crankcase Ventilation System Model(s) 550H (Maxim) 550J (Maxim) 550K (Maxim) xjcdadmin Fri, 06/18/2010 - 01:45 Fresh air Blow-by gas Refer to "CHAPTER 2" for the air cleaner maintenance.