– 2Figure 11 Cover2 Support for spray lance3 Pouring vent for liquid softner(under the appliance hood)(not HDS 551 C Eco)4 Oil level indicator5 Manometer6 Detergent dosing valve and filling openingfor detergent7 Connection for water supply with filter8 High pressure hose9 Guiding roll with fixed position brake10 Hand spraygun11 Pressure/ quantity regulation at the handspray gun12 Spray lance13 High-pressure nozzle (stainless steel)14 Steam nozzle (brass)15 Power supply16 Hand crank for hose drum(only CSX)17 Hose drum(only CSX)18 Pouring vent for fuel19 Nameplate20 Storage compartment for accessories (e.g.steam nozzle), reset button of exhaust tem-perature limiter(under the appliance hood)21 Cover lock22 High pressure connectionFigure 21 Power switch2 Indicator lamp for fuel shortage(not HDS 551 C Eco)3 Liquid softner indicator lamp(not HDS 551 C Eco)4 “Ready for use” indicator lamp5 Indicator lamp for detergent(not HDS 551 C Eco)6 Indicator lamp exhaust temperature limiterHigh-pressure jets can be dan-gerous if improperly used. Thejet may not be directed at per-sons, animals, live electrical equipment orat the appliance itself.According to the applicable regula-tions, the appliance must never beused on the drinking water supplywithout a system separator. Use asuitable system separator manufactured byKÄRCHER; or, as an alternative, a systemseparator as per EN 12729 Type BA. Waterflowing through a system separator is con-sidered non-drinkable.CautionAlways connect the system separator tothe water supply, never directly to the appli-ance!Cleaning of: Machines, Vehicles, Struc-tures, Tools, Facades, Terraces, Garden-ing tools, etc. DangerRisk of injury! Follow the respective safetyregulations when operating at gas stationsor other dangerous areas.– Please follow the national rules andregulations for fuel spray jets of the re-spective country.– Please follow the national rules andregulations for accident prevention ofthe respective country. Fuel spray jetsmust be tested regularly and the resultsof these tests must be documented inwriting.OverviewDevice elementsOperating fieldSymbols on the machineHDS 551 C Eco onlyProper usePlease do not let mineral oil contaminatedwaste water reach soil, water or the sew-age system. Perform engine cleaning andbottom cleaning therefore only on speci-fied places with an oil trap.Safety instructions26 EN