Kärcher HD 1090 Service Handbook
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Kärcher HD 1090 Service Handbook

High pressure washer karcher hd 1090
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Service Handbook
HD 1090
5.905-212
03.02

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Summary of Contents for Kärcher HD 1090

  • Page 1 Service Handbook HD 1090 5.905-212 03.02...
  • Page 2 Foreword Good servicing requires extensive and relevant training as well as comprehensible reference documents. We therefore regularly offer all service technicians both basic and ongoing training courses for the full range of our products. In addition we produce service handbooks for the major equipment which can be used initially as instructional material and subsequently as sources of reference.

  • Page 3: Table Of Contents

    Contents Unit function ..................2-15 Equipment ..........................2 Functional diagram ........................ 4 Pump ............................. 6 Pressure and flow control with the Servopress handgun ............8 Detergent injector with non-return valve................10 Detergent metering valve ....................11 Hand gun with pressure and flow control Servopress with low-effort version ..................

  • Page 4: Unit Function

    Unit function Equipment...
  • Page 5 Unit function Equipment changeover nozzle spray lance servopress handgun adjusting wheel for pressure and flow control high-pressure hose handle detergent metering valve detergent tank cover detergent tank detergent suction hose with filter hood mounting screw water inlet with strainer high-pressure connection unit switch pressure gauge handle mounting screws...

  • Page 6: Functional Diagram

    Unit function Functional diagram...
  • Page 7 Unit function Functional diagram high-pressure hose Any unit without a float tank should not be connected directly to the water inlet. A non- injector return valve (7) at the water supply is intended to prevent detergent from getting into the supply detergent non-return valve network.

  • Page 8: Pump

    Unit function Pump...
  • Page 9 Unit function Pump suction valve Function pressure valve The pump is a 3-piston swash plate pump with drive running in an oil bath. It is directly attached pressure gauge to the motor shaft, therewith achieving optimal efficiency. When the piston returns, the water is oil reservoir taken in via the open suction valve.

  • Page 10: Pressure And Flow Control With The Servopress Handgun

    Unit function Pressure and flow control with the Servopress handgun...
  • Page 11 Unit function Pressure and flow control with the Servopress handgun Threaded plug The Servopress handgun is partially closed Pressure holding valve When the handgun is partially closed, the pres- Spring sure in the pressure chamber (18) does not increase. Due to the decreased water flow rate, Ball the effect of the injector action (16) is reduced, so Valve seat...

  • Page 12: Detergent Injector With Non-Return Valve

    Unit function Detergent injector with non-return valve Detergent can only be taken in if the changeover pressure chamber in front of injector nozzle on the spray lance is set at "CHEM“. injector The pressure in the system thereby drops to ball approx.

  • Page 13: Detergent Metering Valve

    Unit function Detergent metering valve metering knob With this system, the tank lid and metering valve are one unit. valve housing spring In the valve housing, there is a ring-shaped metering channel, the cross-section of which is O-ring increasing. metering channel The inlet and outlet are connected with this O-ring metering channel.

  • Page 14: Hand Gun With Pressure And Flow Control Servopress With Low-Effort Version

    Unit function Handgun with pressure and flow control (Servopress) with low-effort version...
  • Page 15 Unit function Handgun with pressure control and flow control (Servopress) with low-effort version Spray lance connection With this type of handgun it is possible to control the pressure and flow rate continuously, depen- High-pressure hose connection ding on how far the trigger (3) has been depres- sed.

  • Page 16: Changeover Nozzle

    Unit function Changeover nozzle nozzle guard The changeover nozzle should be fitted to the spray lance so that the marking line (5) is at the nozzle top. ball (2x) In this position, the two balls inside the changeo- ver nozzle seal the two upper nozzles so that the screw socket water jet always comes out at the lower nozzle.

  • Page 17: Circuit Diagram 0.087-804

    Unit function Circuit diagram 0.087-804 motor circuit-breaker with thermal over- The model 1.951-261 is reconnectable from 230 V Y (star) to 400 V ∆ (delta). load trip pressure switch, 2-pole From phases L1, L2 and L3 the voltage reaches the motor via unit switch Q1 and pressure switch 3-phase a.c.

  • Page 18: Troubleshooting And Basic Settings

    Troubleshooting and basic settings Unit does not run Electrical connection defective – The voltage indicated on the rating plate must coincide with the mains voltage. – Check voltage at the socket outlet (all 3 pha- ses). – Check main fuse. Note: Do not repair any domestic installations (sockets, etc.) This should only be done by...
  • Page 19 Troubleshooting and basic settings Unit does not run Pressure switch defective – Disconnect the unit from the mains and, with the unit switch on, measure electrical resi- stance between the connecting terminals (in- let-outlet). In a pressureless state, there should be zero Ohms (contacts closed).

  • Page 20: Unit Does Not Reach Required Pressure

    Troubleshooting and basic settings Unit does not reach required pressure Insufficient water supply – The water inlet hose must be at least 3/4 inch in diameter. – Check the water inlet quantity (see technical data). Check water supply quantity Water inlet strainer blocked –...
  • Page 21 Troubleshooting and basic settings Unit does not reach required pressure Pump not vented 150 200 – Switch off the unit. With the gun open, open the water inlet and wait until the water comes out without any bubbles. Pump takes in air –...
  • Page 22 Troubleshooting and basic settings Unit does not reach required pressure Check flow rate – Mount the water inlet hose. – Mount the shut-off valve at the high-pressure outlet. – Connect the high-pressure hose with hand- gun (no nozzle) to the shut-off valve. –...
  • Page 23 Troubleshooting and basic settings Unit does not reach required pressure piston Overflow valve leaking – Unscrew lock nut and adjusting nut from the mounting nut pressure switch. – Unscrew lock nut and adjusting nut from the spring overflow valve. washer –...
  • Page 24 Troubleshooting and basic settings Unit does not reach required pressure Setting overflow valve – Always use a new high-pressure nozzle for the basic setting. – Let the unit run with the Servopress handgun fully open. – With the overflow valve adjusting nut, set the spring tension so that operating pressure is reached (see technical data).

  • Page 25: Unit Switches On And Off Continuously

    Troubleshooting and basic settings Unit switches on and off continuously Servopress handgun leaking – Disassemble the handgun and check all com- ponents for any malfunction. Replace defecti- ve parts if necessary. – Lubricate all O-rings and empty spaces in the union piece with anti-seize, copper grease compound.
  • Page 26 Troubleshooting and basic settings Unit switches on and off continuously Detergent non-return valve leaking – Remove detergent non-return valve. If neces- sary replace defective parts. Do not grease steel ball and O-ring before installing. Detergent non-return valve Overflow valve leaking –...
  • Page 27 Troubleshooting and basic settings Unit switches on and off continuously Control pressure injector defective – Control pressure injector of overflow valve is washed out or the O-rings are defective. – Unscrew the injector; the inside diameter must be 2.4 + 0.05 mm. Replace if necessary. –...

  • Page 28: No Detergent Function

    Troubleshooting and basic settings No detergent function Detergent non-return valve stuck – Unscrew detergent connection, remove and clean ball, spring, plastic sleeve and O-ring. If necessary replace defective parts. Detergent non-return valve dismantled Washed-out injector – If the injector is washed out, no detergent can be taken in.

  • Page 29: Water Escaping Between Cylinder Head And Housing

    Troubleshooting and basic settings Water escaping between cylinder head and housing High-pressure seal defective – A leak of one drop per minute per piston is permissible. – Remove cylinder head head bolts and take off cylinder head. – Carefully dismantle the high-pressure seals. Use an internal extractor if necessary.

  • Page 30: Oil Escaping Between Cylinder Head And Housing

    Troubleshooting and basic settings Oil escaping between cylinder head and housing Defective oil seal on piston – Drain the oil into a suitable container. – Remove the cylinder head. – Replace both housing bolts with 2 mounting bolts (special tools). –...

  • Page 31: Swash Plate/Shaft Sealing Ring/Motor Bearing Defective

    Troubleshooting and basic settings Swash plate/shaft sealing ring/motor bearing defective Swash plate defective – Unscrew the swash plate retaining screw. – With an extraction tool (special tool), pull the swash plate off the motor shaft. – Remove the bearing ring from the swash pla- –...

  • Page 32: Special Tools

    Special tools 1 electric multimeter .................... 6.681-037 2 mounting mandrel – high-pressure seal/oil seal ..........5.901-055 3 mounting sleeve – high-pressure seal .............. 5.901-136 4 mounting mandrel – overflow valve ..............5.901-076 5 amperage conduct pliers .................. 6.681-018 6 swash plate extractor ..................4.901-038 7 assembly/dismantling tool –...

  • Page 33: Technical Data

    Technical data Values all versions Water inlet temperature (max.) ................60 °C Inlet hose length (min.) /diameter (min.) ............7.5 m 3/4 inch Suction height from open tank................1 m Water inlet volume (min.) ................1000 L/h Tightening torque Cylinder head screws ..................50-60 Nm Swash plate ....................

  • Page 34: Technical Data

    Technical data Supply Cleaner Circuit voltage/ Current Thermo- diagram Type of consumption contact current Volt / ph / Hz Amp. Amp. 1.951-111 0.087-804 400 / 3 / 50 < 16.0 14.5 1.951-261 0.087-804 230 / 3 / 50 < 25.0 26.0 1.951-281 0.087-804...

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