This kit contains the most essential items for 1000h service for drill machines with CAT C7 tier 4 engines. Kit contains following items - 1x 55200154 Engine primary air filter cartridge - 1x 55199884 Engine Oil Filter Element - 1x 55199032 Fuel pre-filter (coarse inline screen) (Tier 4 only) - 1x 55198403 Fuel Filter Element (water separator) (Primary) - 2x 55198405 Fuel Filter Element (Secondary) - 1x 55089266 Compressor primary air filter cartridge - 1x 81893749 Compressor oil filter element - 1x 86727289 Hydraulic return oil filter element - 1x 81558479 Hydraulic oil pressure filter - 1x BG00501955 Hydraulic oil tank breather / fuel tank breather element - 1x 55037833 Water trap element Alternator belt (BG00227280) and oil/fuel breathers (BG00501955 x2) not included. If you want to change also these items on the maintence, please order them separately or order the complete kit BG00648293