Kärcher HD 2.8/20 Pb Operator's Manual

Also see for HD 2.5/27 Pb: Operator's manual Operator's manual Operator's manual

Contents

Kärcher HD 2.8/20 Pb Operator's Manual Manual pdf 12 page image

9.800-083.0 • Rev. 04/10APRESSURE WASHER Troubleshooting Guide12PROBLEM POSSIBLE CAUSE SOLUTIONLOW OPERATINGPRESSURE Faulty pressure gauge Install new gauge.Insuffi cient water supply Use larger supply hose; clean fi lter atwater inlet.Old, worn or incorrect spray nozzle Match nozzle number to machine and/orreplace with new nozzle.Belt slippage Tighten or replace; use correct belt.Plumbing or hose leak Check plumbing system for leaks. Re-tapeleaks with tefl on tape.Faulty or mis-adjusted unloader valve Adjust unloader for proper pressure. Installrepair kit when needed.Worn packing in pump Install new packing kit.Fouled or dirty inlet or discharge valvesin pump Clean inlet and discharge valves.Worn inlet or discharge valves Replace with valve kit.Obstruction in spray nozzle Remove obstruction.Leaking pressure control valve Rebuild or replace as needed.Slow engine RPM Set engine speed at proper specifi cations.Pump sucking air Check water supply and possibility of airseepage.Valves sticking Check and clean or replace if necessary.Unloader valve seat faulty Check and replace if necessary.FLUCTUATINGPRESSURE Valves worn Check and replace if necessary.Blockage in valve Check and replace if necessary.Pump sucking air Check water supply and air seepage atjoints in suction line.Worn piston packing Check and replace if necessary.TROUBLESHOOTINGUnloader valves are preset and tested at the factorybefore shipping. Occasional adjustment of the unloadermay be necessary to maintain correct pressure.Start with the valve set at its lowest spring tension. Raisepressure by turning adjusting knob clockwise until pres-sure is at the desired position. Do not overtighten.ADJUSTING UNLOADER VALVESOpen and close spray gun to be sure pressure is correct.Raise or lower pressure by adjusting the knob.Do not by-pass more than 1-2 minutes when by-passingto the suction side of the pump.