Water Supply - Kärcher K 3.740 User Instruction

Water supply

Note: Impurities in the water can damage
the high-pressure pump and accessories.
For protection, the use of the KÄRCHER
water filter (optional accessory, order no.
4.730-059) is recommended.
Water supply from mains
Observe regulations of water supplier.
For connection values, see type plate/tech-
nical data.
Caution
Garden hose (not included) must be at
least 1/2 inch or 5/8 inch in diameter, mini-
mum length 7.5 m.
 Illustration
1 Screw the supplied coupling element to
unit's water inlet.
2 Screw the supplied garden hose con-
nector on to the end of your garden
hose.
3 Push the garden hose connector on to
the water inlet connector and make
sure you hear it click into place before
proceeding.
 Connect garden hose to the cold water
source and turn water on completely.
Drawing in water from open reservoirs
This high-pressure cleaner is suited to work
with the KÄRCHER suction hose with back-
flow valve (Optional accessory, order no.
4.440-238) to draw in surface water, e.g.
from water butts or ponds (see specifica-
tions for max. suction height).
Note: The max. suction height is 0.5 m.
 Fill the KÄRCHER suction hose with
backflow valve with water, screw to wa-
ter supply and hang into the water butt.
 Separate the high pressure hose from
the high pressure connection of the ap-
pliance.
 Switch the appliance on (I/ON) for a
max. of 2 minutes and wait until the wa-
ter exits the high-pressure connection
without bubbles.
 Turn off the appliance "0/OFF".
Start up
Caution
Prior to cleaning, make sure that the high
pressure is placed safely on level ground.
Wear protective goggles and protective
clothing during the cleaning process.
 Illustration
Push the spray lance into the trigger gun
and fasten it by turning it through 90°.
 Insert the mains plug into the socket.
Operation
Caution
Dry runs lasting longer than two minutes
lead to damages to the high pressure
pump. If the appliance does not build up
pressure within two minutes, switch it off
and proceed as instructed in the Chapter
"Troubleshooting".
Danger
The trigger gun is subjected to a recoil force
when the water jet is discharged. Make sure
that you have a firm footing and are also hold-
ing the trigger gun and spray lance firmly.
 Turn on the appliance "I/ON".
 Unlock the lever on the trigger gun.
 Pull on the lever of the trigger gun; the
device will switch on.
Note: Release the lever of the trigger gun;
the device will switch off again. High pres-
sure remains in the system.
Spray lance with pressure regulation
Carrying out the most common cleaning
tasks. The work pressure can be infinitely
regulated between "Min" and "Max".
 Release the lever on the trigger gun.
 Turn the spray lance to the desired po-
sition.
Note: Suitable for working with detergent;
for this, turn the spray lance to the "Mix" po-
sition.
Spray lance with Dirtblaster
For particularly dirty items or areas.
Caution
Car tyres, paint or sensitive surfaces such
as wood should not be cleaned with the dirt
blaster, as there is a risk of damage.
Not suitable for use with detergents.
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English 17