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

Contents

Kärcher HD 2.8/10 ST Ed B Operator's Manual Manual pdf 15 page image

15MaintenanceTroubleshootingPROBLEM POSSIBLE CAUSE SOLUTIONPUMP RUNNINGNORMALLYBUT PRESSURELOW 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.PRESSURELOW AFTERPERIOD 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 improperlyCall local Karcher dealer. Tampering with thefactory setting may cause personal injury and/orproperty damage and will void the manufacturer'swarranty.Worn piston packing Check and replace if necessary.Bypass valve within unloader isobstructed or leaking Remove and clean bypass cartridge.PUMPNOISYAir in suction line Check water supply and connections on suctionline.Broken or weak suction or deliveryvalve spring Check 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 OFWATER INPUMP 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 DRIPPINGFROM PUMP Oil seal worn Check and replace if necessary.EXCESSIVEVIBRATION IN HIGHPRESSURE HOSEIrregular functioning of the pumpvalves Check and replace if necessary.Obstruction in filter Clean inlet filter.MOTOR WILLNOT RUNMotor overloadPush in the overload button located on the motor(single phase) or the overload buttonon the magnetic start switch (three phase).Step down transformer fuses Check fuses and voltage. Replace if necessary.Coil of magnetic starter defective Replace coil after the timer and unloaderswitch have been tested.MACHINE WILLNOT TURN ONWHEN SWITCHIS PUSHEDTimer is defective Join wires 15 and 16 together on timer.If machine works, replace timer.Karcher HD 300-310 Operator’s Manual 9.800-086.0 - P

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