Kärcher HDS4.0/22 Dealer's Manual

Also see for HDS 3.9/30: Operator's manual Operator's manual

Contents

27Maintenance1. Attach a short section (3-5 ft.) of garden hose tomachine to siphon solution from an elevatedcontainer, or add mixture to the float tank. Turnpump switch on allowing solution to be pumpedthrough coils and back into the container. Solutionshould be allowed to circulate 2-4 hours.2. After circulating solution, flush entire system withfresh water. Reinstall wand assembly to spray gunGas Valve Regulator AdjustmentAdjustment of the built-in regulator isn’t normallynecessary, since it is preset at the factory. However,field adjustment may be accomplished as follows:1. Attach manometer at pressure tap port.2. Remove regulator adjustment screw cap.3. With a small screwdriver, rotate the adjustmentscrew clockwise to increase or counterclockwise todecrease gas pressure.4. Replace regulator adjustment screw cap (seebelow).Pressure Relief ValveEach machine is equipped with a relief valve to relievepressure in the system when higher than normaloperating pressures are encountered. If operatingpressure of machine is found to be normal and reliefvalve continues to leak, repair or replace the valve.CAUTION: Relief valve can become obstructed bydeposits and must be unscrewed at least once peryear to allow discharge.Gas Valve Regulator AdjustmentOn/OffSwitchInlet ViewOutletManifold PressureAdjustment ScrewUnder CapGas ValveRegulatorAdjustmentLines ToPilot LightKarcher Liberty HDS Stationary Dealer’s Manual 9.801-508.0 - AY