English 5.906-494.0 Rev. 01 (04/11) 9Service work on the appliance may only be per-formed by the authorized customer service. If so in-structed in the operating instructions, the specialtools indicated by KÄRCHER must be used. DangerDanger from electric current and liquids. While work-ing on the appliance, pull the mains plug out of thesocket and shut off the water supply Turn the filter cup screws and pull it downwardsalong with the cup.The individual parts of the water filter Check the water filter for contamination, clean ifrequired. Assemble it back in the reverse sequence. Unscrew the oil drain screw and collect used oil. Replace washers of the oil drain screw. Screw in the oil drain screws and tighten them. Slowly fill in new oil until the "MAX" marking on theoil sight glass.Drain the oil in a collection basin. Pull the support bow from the pressure switch. Remove the pressure switch. Check the diaphragm, replace if required. Unscrew the filter cup. Loosen the screw connection at the motor flange. Remove the high pressure pump casing; use a flatscrewdriver for this.5 Basic settings and service procedures5.1 Cleaning the water filter5.2 Oil change5.3 Removal of the crankshaft pump