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Model K 370 M Part No. 1.141-260.0
High Pressure Washer Operator Manual
Overview ........................................................................ 2
Important Precautions ................................................ 2-4
Assembly Instructions .................................................... 4
Operating Instructions ................................................... 5
Using the Accessories ................................................... 6
Working with Detergents ................................................ 7
Shutting Down & Clean-Up ............................................ 8
Taking a Break ................................................................ 8
Winterizing and Long-Term Storage .............................. 8
Cleaning Tips ............................................................ 9-10
Optional Cleaning Accessories .................................... 10
Troubleshooting ...................................................... 11-12
Specifications
Operating pressure 1500 PSI
Water volume 1.7 GPM
Voltage 120 V
Amp draw 14 AMPS
5.960-242 12/01
2
Item Description
1 Detergent filter & suction tube“
2 On/Off switch
3 High pressure outlet
4 Water inlet with filter
5 Spray wand extension
6 Spray wand
7 High pressure hose
8 Trigger gun with gun safety
lock (A)
9 Power cord with GFCI plug
(not pictured)
10 Transport handle
11 Machine handle
Never point nozzle at people or animals.
Never drink alcohol or use drugs while operating this equipment.
Never operate while standing in water.
Never touch plug with wet hands.
Never let electrical connections rest in water.
operate pressure washer without the water turned on
Never use hot water
Model K 370 M OVERVIEW
NEVER!
3
WARNING – 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 supervi-
sion is necessary when a product is used
near children.
Know how to stop the pressure washer and
bleed pressures quickly. Be thoroughly
familiar with the controls.
Stay alert — watch what you are doing.
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 spe-
cified in the manual.
This Pressure Washer Is Provided With A
Ground Fault Circuit Interrupter Built Into
The Power Cord Plug. If Replacement Of
The Plug Or Cord Is Needed, Use Only
Identical Replacement Parts.
WARNING – Risk of Injection or Injury –
Do Not Direct Discharge Stream At Persons.
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.
Wear safety goggles.
Do not use acids, solvents, or any other
flammable material in this product. These
products can cause physical injuries to the
operator and irreversible damage to the
machine.
This machine has been designed for use
with cleaning detergent supplied or
recommended by the manufacturer. The
use of other cleaning detergents may affect
the operation of the machine and void the
warranty.
The Gun Safety Lock prevents the trigger
from accidentally being engaged. This
safety feature
does not
lock trigger in the
on position.
SAVE THESE INSTRUCTIONS
IMPORTANT PRECAUTIONS – Read First!
GROUND FAULT CIRCUIT
INTERRUPTER PROTECTION
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.
GROUNDING INSTRUCTIONS
This product must be grounded. If it should
malfunction or breakdown, grounding provides
a path of least resistance for electric current
to reduce the risk of electric shock. This
product is equipped with a cord having an
equipment-grounding conductor and a
grounding plug. The plug must be plugged into
an appropriate outlet that is properly installed
and grounded in accordance with all local
codes and ordinances.
DANGER – Improper connection of the
equipment-grounding conductor can result in
a risk of electrocution. Check with a qualified
electrician or service personnel if you are in
doubt as to whether the outlet is properly
grounded. Do not modify the plug provided
with the product – if it will not fit the outlet,
have a proper outlet installed by a qualified
electrician. Do not use any type of adaptor with
this product.
EXTENSION CORDS
Use only 3-wire extension cords that have
3-prong grounding-type plugs and 3-pole cord
connectors that accept the plug from the
product. Use only extension cords that are
intended for outdoor use. These extension
cords are identified by a 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 disconnect the
extension cord from the receptacle before
disconnecting the product from the extension
cord.
WARNING – To reduce the risk of
electrocution, keep all connections dry and off
the ground. Do not touch plug with wet hands.
4
Water Supply (Cold Water Only)
Water hose must be at least 3/4 inch in
diameter.
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.
Step 1 Assembly transport handle
IMPORTANT PRECAUTIONS – continued
PRECAUTIONS
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.
ASSEMBLY INSTRUCTIONS
Step 2 Pull out the locking slide from the
right side of the trigger gun handle, and
insert the small end of the high pressure
hose into place. Push the locking slide back
into the trigger gun to lock the hose in
position.
Step 3 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 Extension
Collar clockwise until tight.
5
OPERATING INSTRUCTIONS
Step 1 Connect the high pressure hose to
the unit’s high pressure outlet.
Step 2 Insert the spray wand of your
choice into the wand extension. Press in
against the spring tension and twist into the
locked position.
Step 3 Connect garden hose to unit’s
water inlet.
Connect garden hose to the cold
water source and turn water on completely.
Step 5 Plug the power cord into the power
outlet. Unlock the lock of the trigger gun.
Trigger the gun to eliminate trapped air, wait
for a steady flow of water to emerge from
the spray nozzle.
Step 6 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.
6
For high pressure turn to .
For low pressure turn to .
Warning
TO AVOID SERIOUS INJURY,
NEVER POINT SPRAY NOZZLE
AT YOURSELF, OTHER PERSONS
OR ANIMALS
USING THE ACCESSORIES
Spray lance with double nozzle
This wand features a 0º pencil jet which
rotates 360º for maximum dirt cutting action,
effectively increasing cleaning performance
up to 50%. This wand combines the
cleaning performance of a 0º pencil jet with
the surface coverage of a wide angle
nozzle. Not recommended for soft
materials, siding, painted surfaces, decks
or autos.
This brush is ideal for removing stubborn dirt
and stains from finished surfaces. Use with
detergents only.
Rotating spray wand (optional)
Wash brush (optional)
7
Detergents can only be applied at low
pressure setting .
For best results see Cleaning
Tips on pages 10 & 11 for specific
information on how to clean
different surfaces.
Always Use Karcher
Detergents for Best Results.
Karcher biodegradable detergents
are“specially formulated to protect the
environment and your pressure washer.
Special formula won’t clog the suction tube
filter and will protect the internal parts of the
pressure washer for a longer life. For
Karcher Detergents, check your retailer
or call:
1-800-537-4129
The following Karcher detergents are
available:
• Vehicle Wash
• Degreaser
All Purpose Cleaner
• House Wash
• Deck Wash
Step 1 Set the spray lance to the low
pressure setting
by turning the
wand. The wand must be set in the low
pressure position to apply detergents.
Step 2 Fill a container with Karcher
detergent. Place the filter end of detergent
suction tube into the container.
Step 3 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.
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.
Working with detergents
8
Step 6
Disconnect the high pressure hose from the high
pressure outlet and engage the gun safety lock.
Step 1
Engage gun
safety lock.
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.
SHUTTING DOWN & CLEAN-UP
Step 1
Remove detergent
suction tube from
container and insert
into 1 gallon of fresh
water. Siphon water
at low pressure for
one minute.
Step 2
Turn the switch to off
(O) position and
unplug cord from
outlet.
Step 3
Turn off the water
source.
Step 4
Press trigger to
release water
pressure.
Step 5
Disconnect the garden hose
from the water inlet on the
unit.
Step 2
Turn pressure
washer to off (O)
position.
WINTERIZING AND LONG-TERM STORAGE
TAKING A BREAK... five minutes or more
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.
9
Deck Cleaning
(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
previous section to eliminate stop marks and
ensure a more even cleaning result.
Caution: Do not use rotating nozzle
spray wand on wood surface as it may
cause damage.
House Siding
(with or without detergent)
Pre-rinse cleaning surface with fresh water.
If using Kärcher House Wash, place
detergent suction tube directly into cleaning
solution 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.
Caution: Do not use rotating nozzle
spray wand on siding as it may cause
damage.
CLEANING TIPS
Cement Patios,
Brick and Stone
(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
pressure. 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 approximately 3-6
inches from the cleaning surface. Always
clean from top to bottom and from left to
right. For removing extremely stubborn
stains, use Kärcher Rotating Nozzle Spray
Wand.
Cars, Boats & Motorcycles
(with or without detergent)
Pre-rinse vehicle with fresh water. If using
Karcher Vehicle Wash, place detergent
suction 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 surface. If needed, use special Wash
Brush Attachment to remove stubborn dirt.
Rinse at high pressure in a sweeping motion
keeping the spray nozzle approximately 6-8
inches 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 chamois or
soft dry cloth.
Caution: Do not use rotating nozzle
spray wand on vehicles as it may
“cause damage.
10
Barbecue Grills, Outdoor Power
Equipment & 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 Rotating Nozzle Spray
Wand.
Caution: Do not use rotating nozzle
spray wand on cloth, plastic or other
sensitive surfaces as it may cause
damage.
Optional cleaning accessories are available to further enhance your cleaning capabilities:
See accessories order form for product descriptions and ordering instructions.
CLEANING TIPS – continued
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 directly 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 pressure 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.
Caution: Do not use rotating nozzle
spray wand on patio or lawn furniture
as it may cause damage.
Recommendations
Before cleaning any surface an
inconspicuous 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.
OPTIONAL CLEANING ACCESSORIES
• Rotating Wash Brush
• Wash Brush
• House Washing Wand
• Extension Wand
• Rotating Spray Wand
• Flexible Spray Wand
• Underbody Spray Wand
• Telescopic Spray Wand
• Pipe Drain Cleaner
• Floor Washing Tool
• Sandblasting Attachment
• Detergent Foamer Attachment
• Water Pumping Kit
• Water Suction Hose
• Extension Hose 25’
11
TROUBLESHOOTING
Disconnect the machine from the power source before making any repair.
Symptom
Motor will not start
Unit does not reach high
pressure.
Output pressure varies
high and low.
Cause
On/Off switch is in the “OFF” (O)
position.
Power cord is not plugged in.
Extension cord is too long.
Extension cord is not proper gauge.
Extension cord is damaged.
Electrical outlet does not supply
adequate power.
Tripped circuit breaker
Diameter of garden hose is too
small.
Water supply is restricted.
Not enough inlet water supply.
Water inlet filter is clogged.
Spray wand is in low pressure
position.
Not enough inlet water supply.
Pump is sucking air.
Water inlet filter is clogged.
Discharge nozzle is obstructed.
Calcified gun, hose or spray wand.
Solution
Turn switch to the “ON” (I) position
Plug in power cord.
Replace extension cord with either
“a 25 ft. 12/2 gauge cord or a 50
ft. 10/2 gauge cord.
Try a different outlet.
Reset breaker (power supply) or
ground fault circuit interrupter.
Replace with a 3/4 inch garden
hose.
Check garden hose for kinks,
leaks and blockage.
Open water source full force.
Remove filter and rinse out in
warm water.
Turn spray wand to high pressure
position.
Turn water on full force. Check
garden hose for kinks, leaks or
blockage.
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.
Remove filter and rinse out in
warm water.
Blow out or remove debris with a
“fine needle.
Run distilled vinegar through
“detergent suction tube.
12
TROUBLESHOOTING – continued
If you encounter any additional difficulties not listed, please call our service center for help.
Karcher Customer Support USA
1-800-537-4129
Solution
Check connection.
Dilute detergent, for best results
use Kärcher detergent.
Run warm water through filter to
remove debris.
Remove obstruction or replace
detergent suction tube.
Turn spray wand tip to low
pressure position.
Blow out or remove debris with
fine needle.
Tighten fittings.
Insert new washer.
Insert the spray wand into the
spray wand extension. Carefully
press in against the spring tension
and twist into the locked position.
Slide the spray wand extension
into the gun. Turn the wand
collar clockwise onto the gun
threads until tight.
Call Kärcher customer service
“hotline and order repair kit “(part
no. 2.883-111.0).
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.
Check that all fittings are tight.
Call service center.
Call service center.
Symptom
No detergent.
Garden hose
connection leaks.
Spray wand or Spray
wand extension leaks.
Pump is noisy.
Water leaks from pump (up
to 10 drops per minute is
permissible).
Oil Drip.
Cause
Detergent suction tube not properly
connected to the machine.
Detergent is too thick.
Filter on detergent suction tube is
clogged.
Damaged or clogged detergent
suction tube.
Spray wand is in high“pressure
position.
Discharge nozzle is obstructed.
Loose fittings.
Missing/worn rubber washer.
Spray wand not properly attached.
Spray wand extension not properly
attached.
Broken o-ring or plastic insert.
Pump is sucking air.
Loose fittings.
Water seals are damaged or worn.
Oil seals are damaged or worn.
6

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