Kärcher HDS 9/20-4 M Classic Manuel D'utilisation page 17

Maintenance intervals
Weekly
ATTENTION
Milky oil
Device damage
If the oil is milky, inform authorized Customer Service
immediately.
1. Clean the fine filter.
2. Clean the fuel strainer.
3. Clean the fuel filter.
4. Check the oil level.
Every 500 operating hours, at least annually
1. Change the oil.
2. Have the device descaled by Customer Service.
3. Have the device maintained by Customer Service.
Maintenance work
Cleaning the fine filter
1. Depressurise the device.
2. Unscrew the fine filter on the pump head.
3. Dismantle the fine filter and take out the filter inlay.
4. Clean the filter inlay with clean water or compressed
air.
5. Assemble in the reverse order.
Cleaning the fuel sieve
1. Knock out the fuel sieve. Do not allow fuel to enter
the environment.
Clean the fuel filter
1. Release the 3 fastening screws of the cover and re-
move the cover.
2. Remove the fuel filter.
3. Clean the fuel filter.
4. Remount the fuel filter.
Cleaning the fuel tank
1. Release the 3 fastening screws of the cover and re-
move the cover.
2. Pull out the fuel filter and place it to the side in a suit-
able container, as diesel can run out of the pipes.
3. Pull out the empty sensor and place it in a suitable
container.
4. Release the 2 fastening screws between the fuel
tank and the electrical box.
Illustration F
5. Lift the electrical box and pull out the fuel tank to-
wards the filler hole. Support the electrical box on
the motor.
6. Rinse the fuel tank.
7. Reinsert the fuel tank.
8. Reinstall in the in the reverse order.
Changing oil
See the "Technical data" section for the oil filling quanti-
ty and type.
1. Release the 3 fastening screws of the cover and re-
move the cover.
2. Release the 2 fastening screws between the fuel
tank and the electrical box.
Illustration F
3. Lift the electrical box and push the fuel tank partially
towards the burner fan. Support the electrical box on
the motor.
4. Place a suitable catch pan for approx. 0.5 litres of oil
under the pump.
5. Loosen the oil drain plug.
6. Drain the oil into the catch pan. To allow the oil to
drain off more quickly and completely, unscrew the
oil filler plug completely.
Note
Dispose of the old oil in an environmentally friendly
manner or hand it over to an authorised collection point.
7. Retighten the oil drain plug, torque 20-25 Nm.
8. Slowly fill with new oil until the level is in the middle
of the oil level display. The air bubbles must be able
to escape.
9. Screw in the oil filler plug.
10. Push the fuel tank back again.
11. Reinstall in the in the reverse order.
Troubleshooting guide
DANGER
Inadvertently starting up device, touching live com-
ponents
Risk of injury, electric shock
Switch off the device before performing any work on the
device.
Remove the mains plug.
Device not running
No mains voltage
1. Check the power supply and the supply line.
Fault in the voltage supply or current consumption of the
motor too high
1. Check the power supply and the mains power sup-
ply circuit breaker.
2. Contact Customer Service.
Motor overloaded / exhaust gas thermostat has tripped
1. Set the power switch to "0".
2. Allow the device to cool down.
3. Switch the device on.
Malfunction occurs repeatedly
1. Contact Customer Service.
The fuel indicator light lights up
Note
Only applies when the device is running and operating
with hot water.
Fuel tank is empty
1. Refill the fuel.
Device not building up pressure
Air in the system
1. Venting the pump:
a Unscrew the nozzle from the spray lance.
b Allow the device to run until the escaping water is
free of air bubbles.
c In the case of venting problems, allow the device
to run for 10 seconds and then switch it off. Re-
peat the procedure several times.
d Open and close the pressure/quantity regulator
of the pump unit with the high-pressure gun open.
e Switch off the device.
f Screw the nozzle back on.
2. Check connections and lines.
Fine filter dirty
1. Clean the fine filter, replace if necessary.
Water supply volume too low
1. Check the water supply volume (see "Technical da-
ta").
Device is leaking, water is dripping from the bottom
of the device
Pump leaking
1. If there is a significant leak, have the device
checked by Customer Service.
English 17