Kärcher K 3.70 User manual

K 3.70
5.961-038
09/03_2006317
Operating Instructions
PRESSURE WASHER
Before first use of the unit read these operating instructions
and act in accordance with them

2
THANKYOU FOR PURCHASING A KARCHER
PRESSURE WASHER
PLEASE READ THIS LEAFLET CAREFULLY
BEFORE OPERATING YOUR MACHINE.
WHAT IS A PRESSURE WASHER?
A Pressure Washer is essentially a powerful electric motor driving a set
of pistons that force water through a small nozzle, thus creating a
pressurised jet of water. This provides the cleaning power behind the
Karcher Pressure Washer.
AKarcherPressureWashercanbeusedforanendlesslistofapplications
around the home and garden. It provides an efficient, economical and
labour saving way of cleaning with excellent results.
All Karcher domestic pressure washers are designed to run from a
suitablecoldwatersupplyalthoughsomemodelswillacceptawaterinlet
temperature of between 40 °C and 60 °C.
Environmental Comment - Save water with high pressure.
The Karcher Pressure Washer is environmentally friendly enabling you
to reduce your water consumption compared to a normal garden hose.
A definite advantage with a metered water supply
OR
with the added benefit of suction mode, water can be drawn from an
open container such as a water butt.

3
INDEX
1. APPLICATIONS................................................................................................................................4
2. SAFETYINSTRUCTIONS.................................................................................. 4 - 6
ElectricalConnection
Safety Instructions
3. GETTING STARTED...............................................................................................................7
3.1 Contents
3.2 Water Connection
3.3 ElectricalConnection
3.4 SuctionMode
3.5 Detergent
4. OPERATINGYOUR PRESSUREWASHER ......................... 10
4.1 High Pressure Operation
4.2 Low Pressure Operation with Detergent
4.3 Low Pressure OperationWith Brush
4.4 End Of Operation
5. IMPORTANT – CARE AND MAINTENANCE................... 13
6. ACCESSORIES / SPARE PARTS................................................... 14 -15
7. PROBLEM CHECKLIST /TROUBLESHOOTING... 16
8. AFTERSALESSERVICE ......................................................................................... 17
9. TECHNICAL DATA................................................................................................................. 18
10. ASSEMBLY............................................................................................................................................ 19

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1. APPLICATIONS
The main applications for this product are DOMESTIC
cleaning tasks:
• Cars, motorbikes, caravans, boats and bicycles
• Patio’s, fences, garden walls, pathways, driveways and house
facades – particularly useful for cleaning block driveways
• Removal of algae and moss from roofs, brickwork and
guttering
• Garden tools and machinery, furniture and barbecues
• Hygienic cleaning of animal pens and their surroundings
With the addition of Karcher accessories, the list
continues .............
• Clearing blocked drains and pipes
• Removal of old paint and rust from garden furniture and gates
• Spraying insecticide onto trees, plants and lawns
2. SAFETY INSTRUCTIONS
BEFORE STARTING UPYOUR PRESSUREWASHER PLEASE
CHECKYOU HAVETHE FOLLOWING:
We recommend you purchase these items from a reputable store
• RCD plug and socket that will interrupt electrical supply in an
emergency
• A typical garden hose (minimum length 7.5 metres) with suitable
hoseconnection(Hoselock/Gardena type) tomatchthecoupling
on the machine (hose and connector not supplied).

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Electrical Connection
!
Never use defect connection or extension lines! If the connection line
is damaged, it must be replaced with a special connection line that is
available from the manufacturer or his customer service.
!
Please make sure that the connection or extension lines are not dama-
ged by being ran over, pulled or dragged. Protect the connection lines
from heat, oil, and sharp edges.
!
Never touch the mains plug and the socket with wet hands.
!
The connection between connection line and extension line must not
lie in the water.
!
All current-carrying components within the working area must be jet-
proof.
- The appliance may only be connected to an electrical connection that
was performed by an electrician according to IEC 60364.
- Only connect the appliance to alternating current. The voltage must
comply with the voltage specified on the typeplate.
- Minimum fuse protection of the socket 10 A (delay-action fuse).
- To avoid electric accidents, we recommend to use sockets with a se-
ries connected residual current operated device (rated breaking cur-
rent max. 30 mA).
-Warning: Inappropriate extension lines may be dangerous. If you
work outside, only use extension lines that are approved and specifi-
cally labelled and provide of a sufficient conductor cross section:
1 to 10 m: 1.5 mm² 10 to 30 m: 2.5 mm²
- The plug and the coupling of an extension line must be waterproof.
- Always unwind the extension line completely from the cable drum.
Safety Instructions
!
The operation of the device in hazardous locations is not admissible.
!
Please comply with the corresponding safety instructions if you use
the appliance in danger areas (e.g. filling stations).
!
Do not turn on the appliance if the power supply line or important com-
ponents of the appliance, such as safety components, high-pressure
hoses, spray jet, are damaged.
!
Warning: High-pressure hoses, fittings, and couplings are of im-
portance for the appliance safety. Only use high-pressure hoses, fit-
tings, and couplings recommended by the manufacturer.

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!
The appliance is not intended for use by young children or infirm per-
sonswithoutsupervision.
Young children should be supervised to ensure that they do not play
withtheappliance.
!
The operator must use the appliance properly. He must take the local
conditions into consideration and must pay attention to third persons,
in particular children, while working with the appliance.
!
Warning: Do not use the appliance if third persons are within the re-
ach of the appliance unless such persons wear protective clothes.
!
Warning: High-pressure jets may be dangerous if they are used im-
properly.
The jet must not be directed at people, animals, active electrical equip-
ment, or the appliance itself.
!
Never direct the jet at yourself or third persons to clean clothes or
shoes.
!
Never use the appliance to spray objects containing hazardous sub-
stances(e.g.asbestos).
!
Warning: Vehicle tyres/tyre valves may be damaged and burst by the
high-pressure jet. A first sign is the discoloration of the tyre. Damaged
vehicle tyres/tyre valves are hazardous. Always perform the cleaning
with a minimum distance of 30 cm.
!
Cleaning operations during which oil saturated waste water is genera-
ted, such as engine cleaning and underbody cleaning, may only be
performed in cleaning locations that are equipped with an oil separa-
tor.
!
If you clean varnished surfaces, please respect a minimum distance of
30 cm to avoid damages.
!
Never take in solvent-containing liquids or undiluted acids and sol-
vents! These include, for example, benzene, paint thinner, or heating
oil. The spray is highly inflammable, explosive, and toxic. Do not use
acetone, undiluted acids, and solvents as they affect the materials
used on the appliance.
!
If required, wear appropriate protective clothes and glasses to protect
yourselffromreturn spray.
!
Never leave the appliance unattended as long as it turned on.
!
Warning: This appliance has been developed for the use of deter-
gents that are supplied or recommended by the manufacturer. The
use of other detergents or chemicals may affect the safety of the ap-
pliance.

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1Detergentsuctionhose
2Power switch (ON/OFF)
3High-pressureoutlet
4Waterconnectionwithfilter
5Coupling
6Spraylancewith Vario Po-
wer Nozzle
7High-pressurehose
8Spray gun with Safety Lo-
king Device(A)
9MainsElectricLead
10 Wash brush
3. GETTING STARTED
3.1 Contents
Upon opening the carton, if you do not have all the items as detailed
please contact the Help-line on 0906 6800632 (calls at this number are
charged at 25p per minute) from 8.30am to 5.00pm Monday - Friday.
Assembly see Page19

8
Please follow these instructions carefully for
troublefree cleaning
Use the diagram on Page 7 for reference purposes
3.2 Water Connection
• The minimum length of supply hosepipe advised for maximum user
convenience is 7.5 metres with a diameter of 12.5 mm (1/2") to avoid
backpressure and any associated potential damage to your machine.
• Attach your supply hosepipe with its connector to the coupling on the
machine (No. 5) and the other end should be connected to a suitable
watersupply
3.3 Electrical Connection
• Ensure the Power Switch (No.2) is in the “OFF” position before
connecting the factory fitted Plug attached to the Mains Electric Lead
(No.9) into an earthed socket.
If you are using an extension cable, it should always be completely un-
wound from the cable drum and have a sufficient cross-sectional area.
3.4 SuctionMode- anaddedbenefitoftheKarcherPressureWasher
• If you are drawing water from an open container such as a water butt
disconnect the high pressure hose from the machine.
• Disconnectthewater connection/hosepipewith coupling (No.5)
from the machine and replace with a suction hose and filter (Part
No. 4.440-238) that can be purchased as an accessory.
• Allow the pressure washer to operate without the high pressure hose fit-
ted until water flows from the high pressure outlet without bubbles.
• Re-connect the high pressure hose to the high pressure outlet.
Dirt in the drawn water could damage your Pressure Washer !
To avoid this risk please use a suitable filter - Part No. 4.730-097.

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3.5 Detergent
Only cleaning agents recommended by Karcher (UK) Ltd.
should be used. Unsuitable detergents could damage your
Pressure Washer and the object being cleaned.
Recommended Detergents
1. The following cleaning agent may be used undiluted:
UniversalCleaner .............................. Profi RM 555 ASF
2. The following cleaning agents are available as concentrate
and must be diluted with 9 parts of water (1 : 9) before use:
UniversalCleaner .............................. Profi RM 555 ULTRA
AutomotiveCleaner ........................... Profi RM 565 ULTRA
House & Garden Cleaner................... Profi RM 570 ULTRA
BoatCleaner...................................... Profi RM 575 ULTRA
3. Detergent tablets are also available from some stores
Karcher Clean Tabs (10 tablets per box)
10 Tablets dissolved in clean water provide 5 litres of cleaning
detergent.
DETAILS OF THE FULL RANGE OF DETERGENTS AND
CHEMICALS ARE AVAILABLE BY CALLING THE HELP-LINE
ON 0906 6800632 (calls at this number are charged at 25p per
minute) from 8.30am to 5.00pm Monday - Friday.

10
4. OPERATING YOUR PRESSURE WASHER
If you have followed all the instructions so far, you are
now ready to have fun cleaning the KARCHER way!!!
• Assembly the Spray Gun (No. 8) and the high-pressure hose (No. 7),
shown on page 19.
• Attach the high-pressure hose to the high-pressure outlet (No. 3) of
theunit.
•SafetyAssurance
As an added precaution, your pressure washer is fitted with a safety
locking device on the Spray Gun.
• Turn on the supply water and press the Spray Gun lever (No. 8) until
the water flows freely and removes all air locks from the hoses.
• You may now attach the Spray Lance (No. 6) or required accessory to
the Spray Gun.
All accessories are bayonet fit, simply push in and twist
until they click into position !
•Once water is flowing through the machine, you may now switch
on your Karcher Pressure Washer using the Power Switch (No. 2).
• You can regulate your operating pressure on the Spray Lance (No. 6)
by rotating the Vario Nozzle.
Raiseoperatingpressure ........ twist Vario Nozzle in direction “+”.
Reduceoperatingpressure..... twist Vario Nozzle in direction “–”.
WHEN USINGYOUR KARCHER PRESSUREWASHER ON
THE HIGH PRESSURE SETTING,THE RECOMMENDED
WORKING DISTANCE BETWEENTHE NOZZLE ANDTHE
OBJECT OR SURFACETO BE CLEANED IS 30 CM.
ITCANBECLOSERIFREQUIREDFORPATIOSORMASONERY
It is your responsibility to check the suitability of the surface to be cleaned.
Karcher (UK) Ltd. cannot be held responsible for any damaged caused.

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4.1 High Pressure Operation
• Ensure the Spray Lance with Vario Power Nozzle (No. 6) is attached
securely to the Spray Gun (No. 8).
• Set vario power nozzle to high pressure mode "+".
• Aim the lance towards the object to be cleaned
makingsure therecommendedworkingdistance
is used for reference. Release the safety ratchet
on the Spray Gun and squeeze the trigger.
• Switch on the pressure washer (No. 2).
The pressurised water jet alone is capable of fulfilling most
cleaning tasks around the garden or on building work but
detergent and wash brush are advantageous when cleaning
vehicles or other paint finishes.
4.2 Low Pressure Operation with Detergent
• Dilute the detergent in a suitable container to the required concentrati-
on before using. (The correct dilution is dependent on the degree of
soiling of surface and is best determined by experience).
• Hang the Detergent Suction Tube (No. 1) in the Detergent Container.
• Set Vario Power Nozzle to low pressure mode "–".
Note: Nodetergentin high pressure mode
• Aim the Spray Gun towards the object to be clea-
ned, release the Safety Ratchet on the Spray Gun
and squeeze the trigger to apply the detergent to
the working area.
• Switch on the pressure washer (No. 2).
4.3 Low Pressure Operation with Brush
When cleaning surfaces with a grease contamination - typically car paint-
work that always has a greasy traffic film covering. Follow the
procedureof:
• Washing loose dirt away with the clean water high pressure spray.
• Apply the detergent in low pressure mode by removing the bayonet fit
spray lance and fitting the Wash Brush to the Spray Gun.
• Leave for 2-4 minutes for the detergent to have maximum effect.

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• With or without the pressure washer switched on, brush down the sur-
face being cleaned, this physical agitation removes all trace of traffic
film. Finally revert to the high pressure operation with the Spray Lance
and complete the wash down.
We recommend the following cleaning method:
Step 1:
Remove loose dirt by washing over the surface to be cleaned with the
high pressure jet.
Step 2:
Spray on the detergent and leave for 1-4 minutes, so assisting the easy
removal of fine dirt and associated greasy adhesions.
Step 3:
Finally, spray off the loosened dirt with the high pressure spray.
4.4 End Of Operation
ALWAYS REMEMBER TO RINSE YOUR PRESSURE WASHER
AFTER USING DETERGENT BY HANGING THE DETERGENT
SUCTION TUBE IN A CONTAINER WITH CLEAN WATER AND
RUNTHE PUMP FOR APPROXIMATELY ONE MINUTE IN LOW
PRESSURE SETTING.
In the event of a break of 5 minutes in the operation of your Karcher
Pressure Washer, always switch off the pump to avoid damage due
tooverheating.
• Switch off the pressure washer by the Power Switch (No. 2) and
unplug the Mains Electric Lead (No. 9) from the socket.
• Close the water inlet (tap) and disconnect the hosepipe.
•Release the trigger to remove all pressure from the machine
and then secure the trigger with the Safety Locking Device to
preventaccidentalopening.
AFTER USE, ALWAYS REMOVETHE PLUG FROMTHE SOCKET
BEFORE CLEANINGYOUR PRESSUREWASHER.

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5. IMPORTANT – CARE AND MAINTENANCE
To ensure prolonged life and trouble-free use of your
Karcher Pressure Washer we strongly recommend
that you always adopt the following procedures:
Water
• Before use, always check the inlet filter for dirt or debris.
• Visually check to see if the nozzle is blocked by dirt or grit, if so, remo-
ve the dirt from the nozzle hole with a needle and rinse with water
from the front.
Failure to do this will seriously damage your machine and invali-
date the warranty.
• Connect the water supply hose and, without the lance attached,
squeeze the trigger gun to run water through your pressure washer
until the water flow is constant. Then plug in to the electric supply.
• Unless drawing water from an open water source such as a water butt,
always have a minimum of 10 metres (25 feet) of uncoiled hose bet-
ween the water tap and your machine. The internal diameter of the
feed water hose should be 12 mm (1/2”).
• Water Regulations require the use of a back-flow preventer valve at
the tap end of the supply hose.
Only use a full flow connector to connect the hose to the machine.
Electricity
• If using an electrical extension lead it must be rated at a minimum of
13amps.
• Always fully uncoil any extension lead when used.
Chemicals
Use of chemicals other than those recommended by Karcher could cau-
se significant damage which may not be covered by your warranty.
• After using chemicals, always run fresh water through your machine.
•The high pressure hose of your Karcher Pressure Washer should not be
mistreated. It is designed to withstand high pressure operation so vehic-
les should NOT run over it, nor should it be pulled across sharp or abra-
sive edges. These actions may weaken the hose and cause ballooning.

14
IMPORTANT
REMEMBER FROSTWILL DAMAGEYOUR KARCHER
PRESSUREWASHER IF IT IS NOT BEEN COMPLETELY EMP-
TIED OF WATER AFTER USE.ALWAYS STORE IN A FROST
FREEAREA.
6. ACCESSORIES
Awiderangeofpopularaccessoriesareavailablefromyourlocalstore
selling Karcher Pressure Washers
4.763-977 Dirt Blaster/Rotary Jet
A rapidly rotating pencil jet used to remove loose paint, stubborn algae and moss from hard surfaces.
2.638-817 Underbody Lance
Extended lance with angled end and upward firing jet for cleaning under cars, gutters etc.
4.762-065 Rotary Wash Brush
Ideal for car bodywork and windows as the water forces the brush to rotate enhancing cleaning power.
4.760-262 Extension Lance
To add length to the standard lance.
2.637-729 Drain Kit (7.5 m Hose)
2.637-767 Drain Kit (15 m Hose)
A flexible hose with backwards firing high pressure jet to create turbulence and dislodge blockages.
2.638-792 Sandblaster
Used to remove paint, rust and cement from metallic and stone surfaces by using a combination of
high pressure water and sand.
4.760-272 Flexi Lance
A lance which can be angled to any degree to clean hard to reach areas such as wheel arches etc.
2.638-791 Floor Cleaning Lance
An extended lance fitted with three shrouded high pressure nozzles to provide a wide area of cleaning
power without any splash back.
4.440-238 Suction Hose and Filter
Used to provide a water supply to the unit where a mains water supply is not available by placing the kit into a water butt.
2.637-214 Water Pump Kit
9.300-051 25 Kg Grit
6.291-080 RM 555 (5 litre)
6.291-079 RM 555 (6 x 1 litre)
Most accessories will be available from your local store selling Karcher
Pressure Washers. If they are not stocked, most stores will raise a
special order for you. If you have difficulty obtaining accessories
please contact: Help-line on 0906 6800632 (calls at this number are
charged at 25p per minute) from 8.30am to 5.00pm Monday - Friday.

15
6. SPARE PARTS
In the event that your Karcher PressureWasher requires replacement
parts – please refer to the diagram below AND identify the particular
modelofyourmachinebyreferencetothedataplateontheunderside.
Then telephone [phone] for assistance (calls at this number are
charged at 25p per minute) from 8.30am to 5.00pm Monday - Friday.

16
7. PROBLEM CHECKLIST
Themachineyouhavechosenisofthehighestquality.Correctlystored
away from frost it should operate without problems.If a problem does
arise, please check the following chart as a solution may be at hand.
In the unlikely event that you need to return your machine to your
supplier, please ensure that this is returned, complete with
hose, gun and all accessories.
MELBORPESUACELBISSOPNOITCERROC
sesuferenihcaM tratsot detcennoctongulP tekcosevitcefeD nwolbesuF elbacnoisnetxeevitcefeD egatlovsniamgnorW
gulptcennoC tekcosrehtonayrT esufehtegnahC elbacnoisnetxetuohtiwyrT otsdnopserrocegatlovsniamkcehC nihcamfosnoitacificeps
spotspmuP nwolbesuF
roopoteudgnitaehrevO ylppuSretaw
noisnetxefoeziskcehcdnaesufegnahC elbac dluohsesoh-etarwolfretawtelnikcehC etunimenonitekcubertil01allif
erusserpgnortS snoitautculf dekcolbyltrapelzzoNeldeenhtiwelohelzzonmorftridnaelC tnorfehtmorfesnirdna
tonseodenihcaM gnitarepohcaer erusserp
tuonrow/dekcolbelzzoN retawsniametauqedanI dezeeuqsesohtelnI deggolcretlifretaW )4meti1.3( dekcolbesohtelnI
elzzonecalper/naelC etarwolfretawtelnikcehC esohtuonethgiartS retlifnaelC
segakcolbroskaelrofesohkcehC
tnegretedoN noitcus erusserpgnorW retliFtnegreteDdekcolB erusserPwoLotecnaLyarpSteS retliFkcolbnU

17
8. Help-Line
Karcher (UK) Limited operate a help-line allowing customers to dis-
cuss any problems experienced with our products.
The help-line operates during normal business hours, if you have diffi-
culty getting through, please understand that there are peak periods
during the day when our consultants are unable to take all calls co-
ming in. In these circumstances we would ask that you try to contact
us again later in the day.
The help-line number is 0906 6800632 (calls at this number are char-
ged at 25p per minute) from 8.30am to 5.00pm Monday - Friday.
It helps us if you have the model number and data plate details to
hand before making your call as there are very many different models
of Karcher Pressure Washers in use.
Alternatively you may write or e-mail to the address below:
Karcher(UK) Limited
KarcherHouse
BeaumontRoad
Banbury
Oxon, OX16 1TB
E-mail: [email protected]

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9. TECHNICAL DATA
PowerConnection
Voltage ................. 230-240 V -AC
Current ...................... 1~50 Hz
Connected/Load ..........................1.7 KW
MainsFuse ...........................13 AMP
WaterConnection
SupplyTemperature(Max) ...........................40 °C
Supply Rate (Min) ...........................10 litres per minute
SupplyPressure(Max) (12 bar) ............... 1,2 MPa
SupplyHose: Length ..........................7.5 metres
Diameter ..........................1/2 inch
PerformanceData
PumpPressure (Max) (120 bar)............12 MPa
OperatingPressure (110bar).............11 MPa
FlowRate (380L/h)............6.3 litres per minute
DetergentIntake ..........................0,3 litres per minute
Recoil Force of Hand Held Spray Gun at Operating
Pressure(Max) ...........................15 N
Unitvibrations ..........................0.8 m/s²
Noise level LPA (EN 60704-1) ........................74,5 dB (A)
NoiselevelLWA (2000/14/EEC) ...........................90 dB(A)
OptimumWorkingDistance onHigh Pressure ....30 cm
Dimensions
Length .........................395 mm
Width .........................205 mm
Height .........................295 mm
Weight ...........................11 Kg
CircuitDiagram
C1 Capacitor
M1 Motor
Q1 Switch
T Temperaturelimiter
S1 Pressureswitch

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10. ASSEMBLY

Alfred Kärcher GmbH & Co. KG
CleaningSystems
Alfred-Kärcher-Str.28–40
P.O. Box 160
D-71349Winnenden
EU Declaration of Conformity
We hereby declare that the equipment described below
conformstotherelevantfundamentalsafetyandhealthre-
quirementsoftheappropriateEUDirectives,bothinitsba-
sicdesignandconstructionaswellasintheversionmarke-
tedbyus.Thisdeclarationwillceasetobevalidifanymodi-
ficationsaremade to themachinewithout ourexpressap-
proval.
Product: High-pressurecleaner
Model: 1.141-xxx
RelevantEU Directives:
98/37/EEC
73/23/EEC(+93/68/EEC)
89/336/EEC(+91/263/EEC,92/31/EEC,93/68/EEC)
2000/14/EEC
Harmonisedstandardsapplied:
DIN EN 60 335 – 1
DIN EN 60 335 – 2 – 29
DIN EN 55 014 – 1 : 2000 + A1: 2001
DIN EN 55 014 – 2 : 1997
DIN EN 61 000 – 3 – 2 : 2000
DIN EN 61 000 – 3 – 3 : 1995 + A1: 2001
Conformityassessmentprocedure followed: AnexV
Measuredsoundpowerlevel: 87 dB(A)
Guaranteedsoundpowerlevel: 90 dB(A)
Appropriateinternalmeasureshave been takentoensure
thatseries-productionunitsconformatalltimestotherequi-
rementsofcurrentEUDirectivesandrelevantstandards.The
signatoriesareempoweredtorepresentandactonbehalfof
thecompanymanagement.