Kärcher HD 2.8/10 ST Ed B Operator's Manual

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Kärcher HD 2.8/10 ST Ed B Operator's Manual Manual pdf 11 page image

9.800-086.0 • Rev. 01/0811PRESSURE WASHER Troubleshooting GuideTROUBLESHOOTINGPROBLEM POSSIBLE CAUSE SOLUTIONPUMP RUNNINGNORMALLy BUTPRESSURE LOW ONINSTALLATIONPump sucking air Check water supply and possibility of air.Check 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.Worn piston packing Check and replace if necessary.fLUCTUATINGPRESSUREValves worn Check and replace if necessary.Blockage in valve Check and clean if necessary.Pump sucking air Check water supply connections.Worn piston packing Check and replace if necessary.Insufficient water Check filter and hose for breakage.PRESSURE LOWAfTER PERIOD OfNORMAL USENozzle worn Check and replace if necessary.Suction or delivery valves worn Check and replace if necessary.Suction or delivery valves blocked Check and clean if necessary.Unloader valve seat worn Check and replace if necessary.Unloader adjusted improperly Call local Landa dealer.Worn piston packing Check and replace if necessary.Bypass valve within unloader isobstructed or leakingRemove and clean bypass cartridge.PUMP NOISy Air in suction line Check water supply and connections onsuction line.Broken or weak suction or deliveryvalve springCheck and replace if necessary.Foreign matter in valves Check and clean if necessary.Worn bearings Check and clean if necessary.Excessive temperature of water Reduce to below 140°F.PRESENCE Of WATERIN PUMP OILOil seal worn Check and replace if necessary.High humidity in air Check and change oil twice as often.Piston packing worn Check and replace if necessary.WATER DRIPPINGfROM UNDER PUMPPiston packing worn Check and replace if necessary.O-Ring plunger retainer worn Check and replace if necessary.OIL DRIPPING fROMPUMPOil seal worn Check and replace if necessary.ExCESSIvEvIBRATION IN HIGHPRESSURE HOSEIrregular functioning of the pumpvalvesCheck and replace if necessary.Obstruction in filter Clean inlet filter.MOTOR WILL NOT RUN Motor overload Push in the overload button located on themotor (single phase) or the overload buttonon the magnetic start switch (three phase).Step down transformer fuses Check fuses and voltage. Replace if neces-sary.Coil of magnetic starter defective Replace coil after the timer and unloaderswitch have been tested.MACHINE WILL NOTTURN ON WHENSWITCH IS PUSHEDTimer is defective Join wires 15 and 16 together on timer. Ifmachine works, replace timer.