REPLACEMENT PARTS GUIDE 9R Tractors Final Tier 4 (FT4) - 9R 390, 9R 440, 9R 490, 9R 540, 9R 590, 9R 640 ENGINE ENGINE FUEL WATER SEPARATOR FILTER AT365869 (IF EQUIPPED) (FILTER ELEMENT (13.6 L)) RE561968 FILTER ELEMENT (15 L) Replace after every 500 operating hours. DEF INLINE FILTER DZ110513 (FT4) Replace after every 3000 operating hours