Kärcher HDS 3.9/20 Ea Cage Operator's Manual

Also see for HDS 3.5/30 Ea Cage: Operator's manual Operating instructions Manual Operator's manual

HDS 505, 508, 509, 510 • 9.800-078.0 - N13PRESSURE WASHER Troubleshooting GuideTROUBLESHOOTINGPROBLEM POSSIBLE CAUSE SOLUTIONLOWOPERATINGPRESSUREFaulty pressure gauge Install new gauge.Insuffi cient water supply Use larger garden hose; clean filter washerat water inlet.Old, worn or incorrect spraynozzleMatch nozzle number to machine and/or replacewith new nozzle.Plumbing or hose leak Check plumbing system for leaks. Retape leakswith tefl on tape.Faulty or mis-adjusted unloadervalve (where applicable)Adjust unloader for proper pressure. Install repairkit when needed.Worn packing in pump Install new packing kit.Fouled or dirty inlet or dischargevalves in pumpClean inlet or discharge valves.Worn inlet or discharge valves Replace with valve kit.DETERGENTNOTDRAWINGAir leak Tighten all clamps. Check detergent lines forholes.Valve in the injector head maybe blocked, dirty or damagedClean or replace valve in injector.Filler screen on detergent suctionhose pluggedClean or replace.Dried up detergent pluggingmetering valveDisassemble and clean thoroughly.High viscosity of detergent Dilute detergent to specifications.Hole in detergent line(s) Repair hole.Low detergent level Add detergent if needed.Discharge water temperatureabove 180°FLower discharge water temperature.PUMP RUNNINGNORMALLY BUTPRESSURE LOWON INSTALLATIONPump sucking air Check water supply and possibilityof air seepage.Valves sticking Check and clean or replace if necessary.Unloader valve seat faulty Check and replace if necessary.Nozzle incorrectly sized Check and replace if necessary(See serial plate for proper size).Worn piston packing Check and replace in necessary.FLUCTUATINGPRESSUREValves worn Check and replace if necessary.Blockage in valve Check and replace if necessary.Pump sucking air Check water supply and air seepageat joints in suction line.Worn piston packing Check and replace if necessary.PUMPNOISYAir in suction line Check water supply and connectionson suction line.Broken or weak inlet or dischargevalve springsCheck and replace if necessary.Excessive matter in valves Check and clean if necessary.Worn bearings Check and replace if necessary.