Maintenance And Care; Troubleshooting - Kärcher K 3.740 User Instruction

Maintenance and care

Danger
Turn off the appliance and remove the
mains plug prior to any care and mainte-
nance work.
Prior to longer periods of storage, e.g. in
the winter:
 Remove filter from suction hose for de-
tergent and clean under running water.
 Pull out the sieve in the water connec-
tion using flat-nose pliers and clean un-
der running water.
Maintenance
The appliance is maintenance free.
Spare parts
Use only original KÄRCHER spare parts.
You will find a list of spare parts at the end
of these operating instructions.
20 English
Care

Troubleshooting

You can rectify minor faults yourself with
the help of the following overview.
If in doubt, please consult the authorized
customer service.
Danger
Turn off the appliance and remove the
mains plug prior to any care and mainte-
nance work.
Repair works may only be performed by the
authorized customer service.
Appliance is not running
 Pull on the lever of the trigger gun; the
device will switch on.
 Check whether the voltage indicated on
the type plate corresponds to the volt-
age of the mains supply.
 Check the mains connection cable for
damages.
Pressure does not build up in the
appliance
 Check setting at the spray lance.
 Appliance ventilation: Switch the appli-
ance on with the high-pressure hose
detached and operate (max. 2 minutes)
until the water exits the high-pressure
connection without bubbles. Switch off
appliance and reconnect high-pressure
hose.
 Check the water supply.
 Pull out the sieve in the water connec-
tion using flat-nose pliers and clean un-
der running water.
 Suction height of 0.5 m when vacuum-
ing from open container has been ex-
ceeded.
Strong pressure fluctuations
 Clean high-pressure nozzle: Remove
dirt and debris from the nozzle bore, us-
ing a needle and rinse through with wa-
ter from the front.
 Check water flow quantity.