Kärcher K1900R 1.106-143.0 User manual

English . . . . . 4
Español . . . 18
Français. . . 36
K1900R
1.106-143.0
1.106-158.0
8.756-830.0-D 09/18
Electric Pressure Washer
WARNING:
This product and accessories may contain a chemical known to the
State of California to cause cancer and birth defects or other
reproductive harm.
For more information about this regulation: www.P65Warnings.ca.gov

1. Water Inlet
2. High Pressure Hose Reel
3. Hose Connector
4. ON/Off Pedal
5. Power Cord Cleat
6. Nozzles
7. Turbo Nozzle
8. High Pressure Hose
9. Spray Wand
10. Spray Gun
11. Handle
12. Plug Storage
13. Wheel
14. Dual Detergent Tank
15. Detergent Switch
16. Power Cord
Machine Parts List

4 English
Please read and
comply with these
original
instructions prior
to the initial operation of your
appliance and store them for later use
or subsequent owners.
Safety Instructions . . . . . . . . . . . . . . . 4
Assembly Instructions . . . . . . . . . . . . 7
Operating Instructions . . . . . . . . . . . . 7
Using the Accessories . . . . . . . . . . . . 9
Working with Detergents . . . . . . . . . . 9
Taking a Break. . . . . . . . . . . . . . . . . . 11
Shutting Down and
Cleaning Up. . . . . . . . . . . . . . . . . . . . 11
Winterizing and Long-Term Storage . 12
Maintenance Instructions. . . . . . . . . . 12
Cleaning Tips. . . . . . . . . . . . . . . . . . . 12
Optional Accessories. . . . . . . . . . . . . 14
Troubleshooting. . . . . . . . . . . . . . . . . 15
Indicates “an imminently hazardous
situation which, if not avoided, will
result in death or serious injury.”
Indicates “a potentially hazardous
situation which, if not avoided, could
result in death or injury.”
Indicates “a potentially hazardous
situation which, if not avoided, may
result in minor or moderate injury or in
property damage incidents.”
When using this product basic
precautions should always be
followed, including the following:
●Read all the instructions before using
the product.
●To reduce the risk of injury, close
supervision is necessary when a
product is used near children.
●Know how to stop the product and
bleed pressures quickly. Be
thoroughly familiar with the controls.
●Stay alert - watch what you are doing.
K1900R Pressure Washer
Contents
Specifications
K1900R Series
Operating Pressure 1900psi
Max Water Volume 1.3GPM
Amp Draw 13 Amps
Voltage 120V
Model Number 1.106-143.0
1.106-158.0
Serial Number
Hazard Levels
Safety Instructions

English 5
●Do not operate the product when
fatigued or under the influence of
alcohol or drugs.
●Keep operating area clear of all
persons.
●Do not overreach or stand on
unstable support. Keep good footing
and balance at all times.
●Follow the maintenance instructions
specified in the manual.
●This product is provided with a
Ground Fault Circuit Interrupter built
into the power cord plug. If replace-
ment of the plug or cord is needed,
use only identical replacement parts.
Risk of Injection or Injury – Do Not
Direct Discharge Stream At
Persons or Animals.
●High-pressure jets can be dangerous
if misused. The jet must not be
directed at persons, animals,
electrical devices, or the unit itself.
●Wear safety goggles and ear
protection.
Risk Of Fire/Explosion – Do not
spray flammable liquids.
●Do not use acids, alkaline, solvents,
or any flammable material in this
product. These products can cause
physical injuries to the operator and
irreversible damage to the machine.
Risk of Electrocution
●Inspect cord before using - Do not
use if cord is damaged.
●Keep all connections dry and off the
ground.
●Do not touch plug with wet hands.
●Do not use extension cord with this
product.
●Connect to individual branch circuit
only.
Risk of Eye Injury
●Spray can splash back or propel
objects. Always wear properly rated
eye protection such as goggles or
face shield while spraying. (Safety
Glasses do not provide full
protection)
This unit has been designed for use
with cleaning detergents
recommended by the manufacturer.
The use of other cleaning deter-
gents may affect the operation of
the machine and void the warranty.
Gun kicks back – Hold with both
hands.
●The trigger gun safety lock prevents
the trigger from accidentally being
engaged. This safety feature must
be engaged when replacing nozzles
or not in use.
●This safety feature DOES NOT lock
spray in the ON position.
●Do not spray electrical connections,
electrical outlets or fixtures.
●Do not use with flammable liquids
and toxic chemicals.

6 English
●High-pressure. Keep clear of nozzle.
●Injection hazard: Equipment can
cause serious injury if the spray
penetrates the skin. Do not point the
gun at anyone or any part of the
body. In case of penetration seek
medical aid immediately.
●This system is capable of producing
1900 psi. To avoid rupture and injury,
do not operate this pump with
components rated less than 1900 psi
working pressure (including but not
limited to spray guns, hose and hose
connections).
●Before servicing, cleaning or
removing any parts, shut off power
and relieve pressure.
●If connection is made to a potable
water system, the system shall be
protected against back flow.
When connecting the water inlet to
the water supply mains, local
regulations of your water company
must be observed. In some areas
the unit must not be connected
directly to the public drinking water
supply. This is to ensure that there
is no feedback of chemicals into
the water supply. Direct connection
via a receiver tank or backflow
preventer, for example,
is permitted.
Use a water filter to avoid potential
damage from dirt in the water
supply
●Garden hose must be at least
5/8 inch (16 mm) in diameter.
●Flow rate of water supply must not
fall below 2 GPM/gallons per minute
(7.6 L/min).
●Flow rate can be determined by
running the water for one minute into
an empty 5-gallon (18.9 liter)
container.
●The water supply temperature must
not exceed 104°F/40°C.
●Never use the pressure washer to
draw in water contaminated with
solvents, e.g. paint thinners,
gasoline, oil, etc.
●Always prevent debris from being
drawn into the unit by using a clean
water source.
This pressure washer is provided with
a ground-fault circuit-interrupter
(GFCI) built into the plug of the power-
supply cord. This device provides
additional protection from the risk of
electric shock. Should replacement of
the plug or cord become necessary,
use only identical replacement parts
that include GFCI protection.
Water Supply
(Cold Water Only)
Ground Fault Circuit
Interrupter Protection

English 7
1. Insert wheels into the body of the
machine. Secure with axle pin.
2. Push the handle into place.
3. Install the hose connector to the
water inlet.
4. Attach nozzles to handle.
1. Thread the other end of the high
pressure hose onto the spray gun
inlet.
2. Insert the spray wand into the spray
gun. Tighten the quick connect knob.
Assembly Instructions
Operating Instructions

8 English
3. Thread the garden hose onto the
water inlet connector and hand
tighten.
4. Connect the garden hose to the cold
water source and turn the water
completely on.
5. Plug the Ground Fault Circuit
Interrupter (GFCI) into a working
outlet. We recommend that you test
the GFCI as part of the start up
procedure each time you use the
machine. To learn how to perform
this test, visit Karcher-help.com/ and
search for GFCI.
Do not use if GFCI fails test.
NOTE: The actual appearance of the
GFCI may be different from this
illustration.
6. Install the nozzle to the quick connect
on the end of the wand by pulling the
collar back, inserting the nozzle, then
pushing the collar back. Check to
make sure the nozzle is secure.
7. Unlock the Spray Gun safety lock.
Trigger the gun to eliminate trapped
air. Wait for a steady flow of water to
emerge from the spray nozzle.

English 9
8. Turn on the machine by stepping
down on the foot pedal.
The motor starts when the trigger
of the gun is pulled and shuts off
when the trigger is released.
To avoid serious injury, never point
spray nozzle at yourself, other
persons or animals.
Always test an inconspicuous area
before cleaning with high pressure.
Each of the nozzles has a different
spray pattern. Before starting any
cleaning job, determine the best
nozzle for the job.
The Turbo Nozzle
rotates in a zero
degree spray pattern
in a circular motion to
break down tough dirt
and grime. The spray
pattern can cover an area of 4 to 8
inches (10 to 20 cm), depending on
the distance between the tip and the
surface being cleaned.
The 40° Nozzle is
efficient for general
purpose cleaning.
Use to remove loose
dirt and grime from
most surfaces
including cars, wood decks, patios,
outdoor furniture, home siding and
lawn & garden equipment.
The 15° Nozzle is
optimized for
concentrated
cleaning power and
time. Use to remove
paint, stains, mildew,
oil, compacted dirt and grime from
decks, siding, driveways and patios.
The Soap Nozzle is
used to apply cleaning
solution to any
surface. Use to
provide a thorough
cleaning to all
surfaces.
For best results see Cleaning Tips for
specific information on how to clean
different surfaces.
Always Use Kärcher Detergent for
Best Results. Kärcher biodegradable
detergents are specially formulated to
protect the environment and your
pressure washer. The special formula
won’t clog the suction tube and will
Using the Accessories
Using the Nozzles Working with Detergents

10 English
protect the internal parts of the
pressure washer for a longer life.
For Kärcher detergents, check your
retailer or visit our website:
www.Karcher.com/us
Never Use:
●Bleach, chlorine products and other
corrosive chemicals
●Liquids containing solvents (i.e., paint
thinners, gasoline, oils)
●Tri-sodium phosphate products
●Ammonia products
●Acid-based products
These chemicals will harm the unit
and will damage the surface being
cleaned.
Use of these items will void the
warranty.
Detergents can only be applied at low
pressure.
1. Install the soap nozzle to the quick
connect on the end of the wand by
pulling the collar back, inserting the
soap nozzle, then pushing the collar
back. Check to make sure the nozzle
is secure.
2. Fill the soap tank with Kärcher
detergent. This machine is equipped
with a dual soap tank system,
allowing you to use two different
detergent solutions.
3. Turn on the pressure washer by
stepping on the foot pedal. Pull
trigger to operate unit. Liquid
detergent is drawn into the unit and
mixed with water. Apply detergent to
work area. Do not allow detergent to
dry on surface.
4. Turn the dial all the way to “1” to
select the detergent inside tank #1.
Turn the dial all the way to “2” to
select the detergent inside tank #2.
5. To rinse, replace the soap nozzle with
the 15° nozzle and pull trigger to
operate.

English 11
6. Cleaning Up: Always run fresh water
through the detergent tank when
done to flush any remaining deter-
gents from the injection system.
1. Release trigger and engage gun
safety lock.
2. Turn pressure washer OFF by
stepping on the foot pedal.
1. Turn the machine off by stepping on
the foot pedal and unplug the cord
from the outlet.
2. Turn off the water source.
3. Press trigger to release water
pressure.
4. Release trigger and engage the gun
safety lock.
5. Disconnect the garden hose from the
water inlet on the machine.
Taking a Break
Five Minutes or More
Shutting Down and
Cleaning Up

12 English
1. Disconnect all water connections.
2. Turn on the machine for a few
seconds, until the water which had
remained in the pump exits, turn off
immediately.
3. Do not allow high-pressure hose to
become kinked.
4. Store the machine and accessories in
a room which does not reach freezing
temperatures. DO NOT store near
furnace or other sources of heat as it
may dry out the pump seals.
Failure to follow the above
directions will result in damage to
the pump assembly and accesso-
ries and will void the warranty.
Kärcher also recommends the
regular practice of using a pump
protector like “Kärcher Pump
Guard” to prevent cold weather
damage during storage in the
winter months.
1. Disconnect the connector from the
water inlet.
2. Rinse out the water inlet filter in warm
water.
3. Thread the connector into the water
inlet.
This unit is maintenance free
●Before cleaning any surface an
inconspicuous area should be
cleaned to test spray pattern and
distance for maximum cleaning
results.
●If painted surfaces are peeling or
chipping, use extreme caution as
Winterizing and Long-
Term Storage Maintenance Instructions
Cleaning the Water Inlet
Filter
Maintenance
Cleaning Tips

English 13
pressure washer may remove the
loose paint from the surface.
●When using on surfaces which might
come in contact with food, flush
surfaces with plenty of drinking water.
●For additional cleaning tips, visit our
website:
www.Karcher.com/us/
(With or without detergent).
Pre-rinse deck and surrounding area
with fresh water. If using detergent,
apply to surface at low pressure. For
best results, limit your work area to
smaller sections of approximately
25 sq. ft (2.3 m²). Allow detergent to
remain on surface 1-3 minutes. Do not
allow detergent to dry on surface.
Rinse at high-pressure in a long
sweeping motion keeping the spray
nozzle approximately 3-6 in. (7.5-15
cm) from the cleaning surface. Always
clean from top to bottom and from left
to right. When moving on to a new
section of the cleaning surface, be
sure to overlap the previous section to
eliminate stop marks and ensure a
more even cleaning result.
(With or without detergent).
Pre-rinse cleaning surface with fresh
water. If using detergent, apply to
surface at low pressure. For best
results, limit your work area to smaller
sections of approximately 6sq. ft. (1.8
m). Always apply detergent from
bottom to top. Allow detergent to
remain on surface 1-3 minutes. Do not
allow detergent to dry on surface, if
surface appears to be drying, simply
wet down surface with fresh water. If
needed, use special wash brush
attachment (not included) to remove
stubborn dirt. Rinse at high-pressure
from top to bottom in an even
sweeping motion keeping the spray
nozzle approximately 6 ft. (1.8 m) from
the cleaning surface.
(With or without detergent).
Pre-rinse cleaning surface with fresh
water. If using detergent or degreaser,
apply to surface at low pressure. For
best results, limit your work area to
smaller sections of approximately
25 sq. ft. (2.3 m²). Allow detergent or
degreaser to remain on surface 1-3
minutes. Do not allow detergent to dry
on surface. Rinse at high pressure in a
sweeping motion keeping the spray
nozzle approximately 3-6 in.
(7.5-15 cm) from the cleaning surface.
For best results clean from top to
bottom and from left to right. For
removing extremely stubborn stains,
use the Turbo Nozzle.
(With or without detergent).
Pre-rinse vehicle with fresh water. If
using detergent, apply to surface at
low pressure. For best results, clean
one side of vehicle at a time and
always apply detergent from bottom to
top, do not allow detergent to dry on
Deck Cleaning
House Siding
Cement Patios, Brick and
Stone
Cars, Boats and
Motorcycles

14 English
surface. If needed, use special wash
brush attachment (not included) to
remove stubborn dirt. Rinse at high-
pressure in a sweeping motion keep-
ing the spray nozzle approximately
6-8 in. (15-20 cm) from the cleaning
surface (distance should increase
when rinsing pin-striping or other sen-
sitive surfaces). For best results clean
from top to bottom and from left to
right. For best results, wipe surface
dry with a chamois or soft dry cloth.
(With or without detergent).
Pre-rinse cleaning surface with fresh
water. If using detergent or Degreaser,
apply detergent at low pressure. Allow
detergent to remain on surface 1-3
minutes. Do not allow detergent to dry
on surface. Rinse at high-pressure
keeping the spray nozzle
approximately 3-6 in. (7.5-15 cm) from
the cleaning surface. For removing
extremely stubborn dirt, it may be
necessary to move the spray nozzle
even closer to the surface for greater
dirt cutting action.
(With or without detergent).
Pre-rinse furniture and surrounding
area with fresh water. If using
detergent, apply to surface at low
pressure. Allow detergent to remain
on surface 1-3 minutes. Do not allow
detergent to dry on surface. If needed
use special Wash Brush Attachment
(not included) to remove stubborn dirt.
Rinse at high-pressure in a sweeping
motion keeping the spray nozzle
approximately 3-6 in. (7.5-15 cm) from
the cleaning surface. For best results,
clean from top to bottom and from left
to right.
Optional accessories are available
to further enhance your cleaning
capabilities. These accessories are
accurate as of the printing date of
this manual. Please check our
website for pricing and up-to-date
information.
Specially formulated to protect your
pressure washer from freezing,
corrosion and premature wear.
The Pump Guard also adds lubrication
to valves and seals to prevent
sticking. Highly recommended for all
Kärcher pressure washers!
Part Number 9.558-998.0
Barbecue Grills, Outdoor
Power Equipment and
Gardening Tools
Patio and Lawn Furniture
Optional Accessories
Pump Guard

English 15
Disconnect the unit from the power
source before making any repairs.
Troubleshooting
Symptom Cause Solution
Motor will not
start
Power Cord not
plugged in.
Plug in Power Cord.
Electrical Outlet does
not supply adequate
power.
Try a different outlet.
Tripped GFCI plug. Press “Reset” button on GFCI plug.
Tripped Circuit Breaker. Reset circuit breaker.
Thermal Overload
Open.
Switch off pressure washer. The reset
comes automatically once the
temperature of the unit drops.
On/Off pedal is in the
“OFF” position.
Turn pedal to the “ON” position.
Unit does not
reach high
pressure
Diameter of garden
hose is too small.
Replace with a 5/8 inch (16 mm) or
larger garden hose.
Water supply is
restricted.
Check garden hose for kinks, leaks
and blockage.
Not enough inlet water
supply.
Open water source full force.
Water inlet filter is
clogged.
Remove garden hose adapter and
rinse out in warm water.
Output
pressure
varies high
and low
Not enough inlet water
supply.
Open water source full force. Check
garden hose for kinks, leaks and
blockage.

16 English
Output
pressure
varies high
and low
Pump is sucking in air. Check that hoses and fittings are air
tight. Turn off machine and purge
pump by squeezing trigger gun until a
steady flow of water emerges through
the nozzle.
Water inlet filter is
clogged.
Remove garden hose adapter and
rinse out in warm water.
Spray Nozzle is
obstructed.
Blow out or remove debris with a fine
needle.
Calcified gun, hose or
spray wand.
Run distilled vinegar through soap
tank.
No Detergent
Detergent tube is not
connected to the
detergent tank.
Check connection.
Detergent is too thick Dilute detergent. For best results,
use Kärcher detergent.
Kinked detergent tube. Check detergent tube, remove or
straighten kinks.
A high pressure nozzle
is attached.
Make sure the nozzle is the Soap
Nozzle.
Detergent Knob is
between tanks.
Turn knob fully to “1” or “2”.
Spray Nozzle is
obstructed.
Blow out or remove debris with a fine
needle.
Garden hose
connection
leaks
Loose fittings. Tighten fittings.
Missing/worn
rubber washer.
Insert new washer.
Symptom Cause Solution

English 17
If the symptom you are
experiencing is not listed above, or
if the provided solutions do not
solve your issue, please visit our
extensive online troubleshooting
database at:
USA/Canada:
www.karcher-help.com
Mexico:
www.karcher.com.mx
Or Call:
1-800-537-4129
Spray wand
leaks
Spray wand not
properly attached.
Insert the spray wand into the trigger
gun. Carefully press in against the
spring tension and twist into the
locked position.
Broken o-ring or plastic
insert.
Visit www.karcher-help.com or locate
a service centre.
Pump is noisy
Pump is sucking in air. Check that hoses and fittings are air
tight. Turn off machine and purge
pump by squeezing trigger gun until a
steady flow of water emerges through
the nozzle.
Water leaks
from pump
(up to 10
drops per
minute is
permissible).
Loose fittings. Tighten fittings.
Water seals are
damaged or worn.
Visit www.karcher-help.com or locate
a service centre.
Oil Drip Oil Seals are
damaged or worn.
Visit www.karcher-help.com or locate
a service centre.
Symptom Cause Solution