Model K 502 M
Part No. 1.069-935.0
High Pressure Washer Operator Manual
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . .3
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . .4
GFCI Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Using the Accessories . . . . . . . . . . . . . . . . . . . . . . . . .5
Working with Detergents . . . . . . . . . . . . . . . . . . . . . . .6
Shut Down and Clean-Up . . . . . . . . . . . . . . . . . . . . . .7
Taking a Break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Winterizing and Long-Term Storage . . . . . . . . . . . . . .7
Cleaning Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9
Optional Cleaning Accessories . . . . . . . . . . . . . . . . . .9
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . .10-11
Specifications
Operating pressure 1500 PSI
Water volume
Voltage
Amp draw
1.7 GPM
120 V
13 AMPS
In USA Call:
1-800-537-4129
or visit our website:
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IMPORTANT PRECAUTIONS – Read First!
disconnect the extension cord from the
Safety Warnings
receptacle before disconnecting the
product from the extension cord. If you are
using an extension cord, it should always
be completely unwound from the cable
drum.
When using this product, basic precau-
tions should always be followed:
• Read all the instructions before using
the product.
• High pressure jets can be dangerous
if subject to misuse. The jet must not
be directed at persons, animals,
electrical devices, or the machine itself.
• To reduce the risk of injury, do not
operate the machine near children.
Ground Fault Circuit Interrupter
(GFCI) Protection
This unit is supplied with a portable
Ground Fault Circuit Interrupter (GFCI).
UL indicates that the power cord has been
investigated for compliance with the
applicable provisions of UL 943, Third
Edition (Standard for Ground Fault Circuit
Interrupters) and other applicable
standards. If power is interrupted in the
line, the GFCI will automatically reclose
the circuit to the load after power is
restored. Depending on the GFCI model,
it may be necessary to manually operate
the reset button to restore power to the
GFCI load circuit.
• Learn how to stop the machine and
release pressure quickly. Be thoroughly
familiar with the controls.
• Stay alert — watch what you are doing.
• Wear safety goggles.
• Do not use acids,
solvents, or any
flammable material in this product.
These products can cause physical
injuries to the operator and irreversible
damage to the machine.
• Do not operate the product when
fatigued or under the influence of
alcohol or drugs.
This Product Is
Double Insulated
2
In a double-insulated product, two systems
of insulation are provided instead of
grounding. No grounding method is
provided on a double-insulated product,
nor should a method for grounding be
added to the product. Servicing a double-
insulated product requires extreme care
and knowledge of the system, and should
be done only by qualified service
• Do not stand on unstable surfaces.
Stand with both feet balanced at all
times.
• To reduce the risk of electrocution, keep
all connections dry and off the ground.
Do not touch plug with wet hands.
• The Gun Safety Lock PREVENTS
the trigger from accidentally being
engaged. This safety feature DOES
NOT lock trigger in the on position.
personnel. Replacement parts for a
double-insulated product must be identical
to the parts they replace. A double-
insulated product is marked with the
words, “DOUBLE INSULATED.”
Extension Cords
Use a sufficient gauge: Up to 25 ft = 12/3
AWG; 25 to 50 ft = 10/3 AWG. Use only
extension cords that are intended for
outdoor use. These extension cords are
identified by the marking “Acceptable for
use with outdoor appliances; store indoors
while not in use.” Use only extension cords
having an electrical rating not less than the
rating of the product. Do not use damaged
extension cords. Examine extension cord
before using and replace if damaged. Do
not abuse extension cord and do not yank
on any cord to disconnect. Keep cord away
from heat and sharp edges. Always
Caution
•
•
Follow the maintenance instructions
specified in the manual.
This machine has been designed
for use with cleaning detergent sup-
plied or recommended by the manu-
facturer. The use of other cleaning
detergents may affect the operation
of the machine and void the warran-
ty.
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IMPORTANT PRECAUTIONS – continued
Water Supply
(Cold Water Only)
• Water hose must be at least 3/4 inch in
diameter.
• 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.
• Flow rate of water supply must not fall
below 2.5 GPM (gallons per minute).
• Flow rate can be determined by running
the water for one minute into an empty
5-gallon container.
• Always prevent debris from being drawn into
the unit by using a clean water source.
ASSEMBLY INSTRUCTIONS
3
Step1 Place the transport handle onto
the mounting brackets on the sides of the
washer and align the four holes. Hold each
four-sided nut with one finger while inserting
each screw and tighten with a screwdriver.
Step2 Slide the hose caddy into the slots
on the transport handle and snap into place.
Step3 Pull out the locking slide from
the right side of the trigger gun handle,
and insert the small end of the high pres-
sure hose into place. Push the locking
slide back into the trigger gun to lock the
hose in position.
Step4 Insert the Spray Wand Extension
into the trigger gun. Press in against the
spring tension and twist into the lock posi-
tion. Turn the Spray Wand Extension Collar
clockwise until tight.
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OPERATING INSTRUCTIONS
Step1 Connect the high pressure hose to the
unit’s high pressure outlet.
Step2 Install the Vario spray wand
into the wand extension. Push in and
turn clockwise to lock spray wand in
place.
4
Step3 Connect the garden hose to the
water inlet using the quick connect adapter and
coupling.
Step4 Connect garden hose to the
cold water source and turn water on
completely.
Step5 Plug the power cord into the power out-
let. Trigger the gun to eliminate trapped air, wait
for a steady flow of water to emerge from the
spray nozzle.
Step6 Turn on the pressure
washer (I). The motor starts only if the
trigger of the gun is pulled and shuts off
when the trigger is released.
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GFCI INSTRUCTIONS
Note:
The actual
appearance
of the GFCI
may be
different from
this
illustration.
Step1
Plug the Ground
Fault Circuit Interrupter (GFCI)
into a working outlet.
Step2
Press “TEST”, then
press “RESET” to assure proper
connection to power.
USING THE ACCESSORIES
Vario spray wand
5
The Vario spray wand allows you to adjust the cleaning pressure. To clean at maximum
pressure, the Vario wand must be positioned to the high pressure setting (+). To apply
detergent, the wand must be positioned to the low pressure setting (-).
For higher pressure turn
wand collar in the plus (+)
direction.
For lower pressure turn
wand collar in the minus (-)
direction.
WARNING
TO AVOID SERIOUS INJURY,
NEVER POINT SPRAY NOZZLE
AT YOURSELF, OTHER PER-
SONS OR ANIMALS
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WORKING WITH DETERGENTS
Detergents can only be applied at low pressure (-).
For best results see Cleaning Tips
on pages 8 & 9 for specific
information on how to clean
different surfaces.
Step1 Install the Wash brush or the Vario
spray wand. Set the Vario spray wand to the
low pressure setting (-) by turning the wand
collar. The wand must be set in the low pres-
sure (-) position to apply detergents.
Always Use Karcher
Detergents for Best Results.
Karcher biodegradable detergents are
specially formulated to protect the environ-
ment and your pressure washer. The special
formula won’t clog the suction tube filter
and will protect the internal parts of the pres-
sure washer for a longer life. For Karcher
Detergents, check your retailer
6
or call:
In USA Call:
1-800-537-4129
or visit our website:
Step2 Fill a container with Karcher
detergent. Set metering valve on filter to
desired dosage. Place the filter end of
The following Karcher detergents are
available:
• Vehicle Wash
• House Wash
• Deck Wash
detergent suction tube into the container.
• Degreaser
• All Purpose Cleaner
Caution
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.
Step3 Turn on the pressure washer.
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.
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SHUTTING DOWN & CLEAN-UP
Step1 Remove de-
tergent suction tube from
container and insert into
1 gallon of fresh water.
Siphon water at low pres-
sure for one minute.
Step2
Step3
Turn off the water
source.
Step4
Press trigger to
release water
pressure.
Turn the switch to
off (O) position
and unplug cord
from outlet.
7
Step5 Disconnect the
garden hose from the
water inlet on the unit.
Step6 Disconnect the high pressure hose from the
high pressure outlet and engage the gun safety lock.
TAKING A BREAK... five minutes or more
Step1
Engage gun
safety lock.
Step2
Turn pressure
washer to off (O)
position.
WINTERIZING AND LONG-TERM STORAGE
1. Disconnect all water connections.
2. Start 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.
Caution: Failure to follow the above
directions will result in damage to the
pump assembly and accessories.
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CLEANING TIPS
Deck Cleaning
Cement Patios,
Brick and Stone
(with or without detergent)
Pre-rinse deck and surrounding area with
fresh water. If using Kärcher Deck Wash,
place detergent suction tube directly into
cleaning solution and apply to surface at low
pressure. For best results, limit your work
area to smaller sections of approximately 25
square feet. Allow Kärcher Deck Wash 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 inches
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 pre-
vious 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 Karcher All Purpose Cleaner, place
detergent suction tube directly into cleaning
solution and apply to surface at low pres-
sure. For best results, limit your work area
to smaller sections of approximately 25
square feet. Allow Kärcher All Purpose
Cleaner 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 approxi-
mately 3-6 inches from the cleaning surface.
Always clean from top to bottom and from
left to right. For removing extremely stub-
born stains, use Kärcher Dirtblaster® Wand.
Cars, Boats & Motorcycles
(with or without detergent)
House Siding
(with or without detergent)
Pre-rinse vehicle with fresh water. If using
Karcher Vehicle Wash, place detergent suc-
tion tube directly into cleaning solution and
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 sur-
face. If needed, use special Wash Brush
Attachment to remove stubborn dirt. Rinse
at high pressure in a sweeping motion keep-
ing the spray nozzle approximately 6-8 inch-
es from the cleaning surface (distance
should increase when rinsing pin-striping
or other sensitive surfaces). Always clean
from top to bottom and from left to right. For
best results, wipe surface dry with a cham-
ois or soft dry cloth.
8
Pre-rinse cleaning surface with fresh water.
If using Kärcher House Wash, place deter-
gent suction tube directly into cleaning solu-
tion and apply to surface at low pressure
(for best results, limit your work area
to sections of approximately 6 feet and
always apply detergent from bottom to top).
Allow Karcher House Wash 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 to remove stubborn dirt. Rinse
at high pressure from top to bottom in an
even sweeping motion keeping the spray
nozzle approximately 6 inches from the
cleaning surface.
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CLEANING TIPS – continued
Barbecue Grills, Outdoor Power
Equipment &
Patio & Lawn Furniture
(with or without detergent)
Pre-rinse furniture and surrounding area with
fresh water. If using Kärcher All Purpose
Cleaner, place detergent suction tube direct-
ly into cleaning solution and apply to surface
at low pressure. Allow Kärcher All Purpose
Cleaner to remain on surface 1-3 minutes.
Do not allow detergent to dry on surface. If
needed use special Wash Brush Attachment
to remove stubborn dirt. Rinse at high pres-
sure in a sweeping motion keeping the spray
nozzle approximately 3-6 inches from the
cleaning surface. For best results, clean from
top to bottom and from left to right.
Gardening Tools
(with or without detergent)
Pre-rinse cleaning surface with fresh water. If
using Kärcher All Purpose Cleaner or
Degreaser, place detergent suction tube
directly into cleaning solution and apply
detergent at low pressure. Allow Kärcher
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 inches 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. To remove
caked on mud from garbage cans, lawn
mower blades, wheel barrels or other
non-sensitive metal surfaces, you may
want to use the Karcher Dirtblaster® Wand.
Recommendations
• Before cleaning any surface an inconspicu-
ous area should be cleaned to test spray
pattern and distance for maximum cleaning
results.
• If painted surfaces are pealing or chipping,
use extreme caution as pressure washer
may remove the loose paint from the
surface.
9
OPTIONAL CLEANING ACCESSORIES
Optional cleaning accessories are available to further enhance your cleaning capabilities:
See accessories order form for product descriptions and ordering instructions.
• Wash Brush
• Telescopic Spray Wand
• Pipe Drain Cleaner
• House Washing Wand
• Extension Wand
• Dirtblaster® Wand
• Flexible Spray Wand
• Underbody Spray Wand
• Detergent Foamer Attachment
• Water Suction Hose
• Extension Hose 25’
• Rotating wash brush
In USA Call:
1-800-537-4129
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TROUBLESHOOTING
Disconnect the machine from the power source before making any repair.
Symptom
Cause
Solution
On/Off switch is in the
“OFF” (O) position.
Turn switch to the “ON” (I) position.
Motor will not start.
Power cord is not plugged in. Plug in power cord.
Extension cord is too long. Replace extension cord with either
a 25 ft. 12/3 gauge cord or a 50 ft.
10/3 gauge cord.
Extension cord is not
proper gauge.Extension
cord is damaged.
Electrical outlet does not
supply adequate power.
Try a different outlet.
Ground Fault Circuit
Reset breaker (power supply)
Interrupter (GFCI) tripped. or GFCI.
Replace with a 3/4 inch
garden hose.
Diameter of garden hose
is too small.
Unit does not reach
high pressure.
Water supply is restricted. Check garden hose for kinks,
leaks and blockage.
Not enough inlet water supply. Open water source full force.
10
Water inlet filter is
clogged.
Remove filter and rinse out
in warm water.
Spray wand is in low
pressure position.
Turn spray wand to high
pressure position.
Wash brush is attached.
Attach vario spray wand
Not enough inlet water
supply.
Turn water on full force. Check garden
hose for kinks, leaks or blockage.
Output pressure
varies high and
low.
Pump is sucking 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 filter and rinse out
in warm water.
Discharge nozzle
is obstructed.
Blow out or remove debris
with a fine needle.
Calcified gun, hose
or spray wand.
Run distilled vinegar through
detergent suction tube.
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TROUBLESHOOTING – continued
Symptom
Cause
Solution
Detergent suction tube not Check connection.
properly connected to the
machine.
No detergent.
Detergent is too thick.
Dilute detergent, for best results
use Kärcher detergent.
Filter on detergent suction Run warm water through filter
tube is clogged.
to remove debris.
Damaged or clogged
detergent suction tube.
Remove obstruction or
replace detergent suction tube.
Spray wand is in
high pressure position.
Turn spray wand tip to
low pressure position.
Discharge nozzle
is obstructed.
Blow out or remove debris
with fine needle.
Detergent container is empty. Add more detergent.
Detergent filter valve is
at lowest setting.
Set detergent filter valve to a high-
er setting.
Loose fittings.
Tighten fittings.
Garden hose
connection leaks.
11
Missing/worn rubber washer. Insert new washer.
Spray wand not
properly attached.
Insert the spray wand of your choice into
the the wand extension. Push in and turn
clockwise to lock spray wand in place.
Spray wand
or Spray wand
extension leaks.
Spray wand extension
not properly attached.
Insert the spray wand extension into
the trigger gun. Press in against the
spring tension and twist into the lock
position. Turn the spray wand exten-
sion collar clockwise until tight..
Broken o-ring.
Call Kärcher customer service
hotline and order an o-ring.
Pump is sucking 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.
Pump is noisy.
Loose fittings.
Check that all fittings are tight.
Call service center.
Water leaks
from pump.
Water seals are
damaged or worn.
Oil seals are damaged or worn. Call service center.
Oil Drip.
If you encounter any additional
difficulties not listed, please call
our service center for help.
In USA Call:
1-800-537-4129
Kärcher Customer Support USA
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