Troubleshooting - Kärcher HD 9/21 G Manual Del Usuario

After 500 operating hours, at least
annually
 Change the oil in the high pressure
pump.
Maintenance Works
Clean water filter.
 Shut off water supply.
 Unscrew the covering nut.
 Remove the filter cup towards the bot-
tom.
 Clean filter inlay and filter cup.
 Check the O-rings for proper seating.
 Insert the filter inlay into the filter cup.
 Replace the filter cup.
 Screw on and tighten the union nut.
Oil change in high pressure pump
Oil change:
 Ready a catch bin for appr. 1 Liter oil.
 Turn out the oil drain screw.
 Drain the oil in a collection basin.
Dispose of old oil ecologically or turn it in at
a collection point.
 Screw in the oil drain screw.
 Fill in new oil up to the middle of the oil
sight glass.
Add oil slowly so that air bubbles can es-
cape.
For oil type refer to technical specifica-
tions.

Troubleshooting

DANGER
Risk of injury if the machine is left running
in an unattended state.
Before working on the device, turn the start-
er to "0/OFF" and remove the spark plug
connector.
Risk of burns! Do not touch hot mufflers,
cylinders or radiator ribs.
Motor does not run
Follow operating instructions of the engine
manufacturer!
Device is not building up pressure
– Operating speed of the engine is too
low
 Check operating speed of the engine
(refer to technical data).
– Low-pressure nozzle is installed.
 Install the high pressure nozzle.
– Nozzle is blocked/ washed out
 Clean/ replace nozzle.
– Water filter contaminated
 Clean water filter.
– Air within the system
 Deaerate the appliance (see "Start-up")
– Amount of water supply is too low.
 Check water supply level (refer to tech-
nical data).
– Pipe inlets to pump are leaky or blocked
 Check all inlet pipes to the pump.
Device leaks, water drips from the
bottom of the device
– Pump leaky
Note: 3 drops/minute are allowed.
 With stronger leak, have device
checked by customer service.
Detergent is not getting sucked in
– High pressure nozzle is installed
 Install the low pressure nozzle.
– Detergent suction hose with filter is
leaky or blocked
 Check/ clean detergent suction hose
with filter.
– Backflow valve in the connection of the
detergent suction hose is jammed
 Clean/ replace backflow valve in the
connection of the detergent suction
hose.
– Detergent dosing valve is closed or
leaky/ blocked
 Open or check/clean detergent dosing
valve.
If malfunction can not be fixed, the de-
vice must be checked by customer ser-
vice.
EN – 8 23