Kärcher 750mx User manual

5.959-908 02/01
750 MX

2
THANK YOU FOR PURCHASING A KARCHER
PRESSURE WASHER
PLEASE READ THIS LEAFLET CAREFULLY
BEFORE OPERATING YOUR MACHINE.
WHATIS APRESSURE 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
2. SAFETY INSTRUCTIONS
3. GETTING STARTED
3.1 Contents
3.2 Water Connection
3.3 Electrical Connection
3.4 Suction Mode
3.5 Detergent
4. OPERATING YOUR PRESSURE WASHER
4.1 High Pressure Operation
4.2 High Pressure Operation With Dertergent
4.3 Low Pressure Operation Without Brush
4.4 Low Pressure Operation With Brush
4.5 End Of Operation
4.6 Storage
5. CARE AND MAINTENANCE
6. ACCESSORIES / SPARE PARTS
7. PROBLEM CHECKLIST / TROUBLESHOOTING
8. AFTER SALES SERVICE
9. TECHNICAL DATA
10. ASSEMBLY

4
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

5
2. SAFETY INSTRUCTIONS
BEFORE STARTING UP YOUR PRESSURE WASHER PLEASE
CHECK YOU HAVE THE 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)tomatch thecoupling
on the machine (hose and connector not supplied).
•The mains voltage and supply indicated on the Rating Plate of the
machine corresponds with that of the power source.
•The insulation of the supply cable is not damaged.
•Only earthed sockets should be used.
•If you are using an extension cable it must be completely unwound
from the cable drum and be the correct diameter:
10 meter length of cable should have a cross section of 1.5 mm²
30 meter length of cable should have a cross section of 2.5 mm²
Safety Assurance
As an added precaution, your pressure washer is fitted with a safety
locking device on the Spray Gun.
AFTER USE, ALWAYS REMOVE THE PLUG FROM THE SOCKET
BEFORE CLEANING YOUR PRESSURE WASHER

6
3. GETTING STARTED
3.1 Contents
Upon opening the carton,
if you do not have all the items
as detailed please contact the
Customer Helpline on
01295752200.
1 Transport Bracket
2 High Pressure Hose Reel
3 High Pressure Outlet
4 Power Switch (On/Off)
5 Mains Electric Lead with Plug
6 Mains Lead Storage
7 Support Leg
8 Inlet Water Connection (with Strainer)
9 Hosepipe Connector
10 Detergent Dosing Valve
Detergent Suction Tube with Filter
11 Detergent Tank
12 Clean Gun
13 Detergent Chamber
14 Safety Lock Device
15 High Pressure Hose
16 Pressure Gauge
17 Spray Lance with Pressure Regulator
18 Wash Brush
Assembly
see Page 19
Assembly
see Page 19

7
Please follow these instructions carefully
for troublefree cleaning.
Use the diagram on Page 6 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 allow
free flow of inlet water to the machine so avoiding backpressure and
any associated potential damage to your machine.
• Attach your supply hosepipe with its connector to the coupling on the
machine (No.9) and the other end should be connected to a suitable
water supply.
3.3 Electrical Connection
• Ensure the Power Switch (No.4) is in the “OFF” position before
connecting the factory fitted Plug attached to the Mains Electric Lead
(No.5) into an earthed socket. (it is recommended that an RCD plug
socket is used.)
If using an Extension Cable make sure it is completely unwound
from the cable drum and is the correct diameter.
3.4 SuctionMode- anaddedbenefitoftheKarcherPressureWasher
• If you are drawing water from a static water supply such as a water
butt disconnect the water connection/hosepipe with coupling (No.9)
from the machine and replace with a suction hose and filter (Part
No. 4.440.238) that can be purchased as an accessory.
• Disconnect the Spray Lance from the Clean Gun.
• Allow the pressure washer to operate without the Spray Lance fitted
until water flows from the Clean Gun without bubbles.
• Re-connect the Spray Lance to the Clean Gun.
Dirt in the drawn water could damage your Pressure Washer !
To avoid this risk please use a suitable filter - Part No. 6.414.389.

8
3.5 Detergent
It is recommended that only cleaning agents formulated by
and manufactured for Karcher should be used. Unsuitable
detergents could damage your Pressure Washer and the
object being cleaned.
Recommended Detergents
1. Detergent tablets
Karcher Clean Tabs (10 tablets per box):
10 Tablets dissolved in clean water provide 5 litres of cleaning
detergent.
2. The following cleaning agent may be used undiluted:
Universal Cleaner.............................. Profi RM 555 ASF
3. The following cleaning agents are available as concentrate
and must be diluted with 9 parts of water (1 : 9) before use:
Universal Cleaner.............................. Profi RM 555 ULTRA
Automotive Cleaner........................... Profi RM 565 ULTRA
House & Garden Cleaner.................. Profi RM 570 ULTRA
Boat Cleaner ..................................... Profi RM 575 ULTRA
NOTE:
In all instances, detergent concentration is set on the machine. It is
recommended that you start cleaning at maximum dilution, increasing
the concentration only if considered necessary for the cleaning task.
DETAILS OF THE FULL RANGE OF DETERGENTS AND
CHEMICALS ARE AVAILABLE BY CALLING THE KARCHER
CUSTOMER HELPLINE ON 01295 752200

9
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!!!
• Turn on the supply water and press the Clean Gun lever (No.12) until
the water flows freely and removes all air locks from the hoses.
• You may now attach the bayonet fit Spray Lance (No.17) or required
accessory to the Clean 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.4)
• You can regulate the working pressure on the spray by turning the
nozzle end of the Spray Lance (No.17) in a “+” or “-” direction.
• The working pressure can be read from the pressure gauge (No.16)
on the Clean Gun.
WHEN USING YOUR KARCHER PRESSURE WASHER ON THE
HIGH PRESSURE SETTING, THE RECOMMENDED WORKING
DISTANCE BETWEEN THE NOZZLE AND THE OBJECT OR
SURFACE TO BE CLEANED IS 30 CM. IT CAN BE CLOSER IF
REQUIRED FOR PATIOS OR MASONERY.
When cleaning painted surfaces, ensure that the paint is sound and
there are no signs or rusting or blistering.
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.

10
4.1 High Pressure Operation
• Switch on the pressure washer (No.4)
• EnsuretheSprayLancewiththePressureRegulator(No.17)isattached
securely to the Clean Gun (No.12) and the nozzle is set to the required
setting (+).
• Aim the lance towards the object to be cleaned making sure the
recommended working distance is used (for reference see Page 9).
Release the Safety Lock Device (No.14) on the Clean Gun and
squeeze the lever.
The pressurised water jet alone is capable of fulfiling 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 High Pressure Operation with Detergent
• Fill Detergent Chamber (13)
with Clean Stick.
• Set the Detergent Dosing Ring
to the desired dosage.
• Ensure the Spray Lance with the
Pressure Regulator (No.17) is
attached securely to the Clean
Gun (No.12) and the nozzle is set to the required setting (+).
• Switch on the pressure washer (No.4)
• Aim the nozzle towards the object to be cleaned making sure the
recommended working distance is used (for reference see Page 9).
Release the Safety Locking Device on the Clean Gun and squeeze
the lever to apply the detergent to the working area.
• To rinse the detergent away. Take out used Clean Stick from Deter-
gent Chamber (dry and store for further use). Spray with the required
jet spray setting until no trace of detergent can be found.