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1-800-4-DeWALT • www.dewalt.com
Instruction Manual INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA
Guide D'utilisation DE GARANTÍA. ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES
Manual de instrucciones DE USAR EL PRODUCTO.

DP3400
Pressure Washer
Laveuse à pression
Lavadora a presión
 FIG. 1
DP3400 Pressure Washer p c f d
A. Handle assemble I. Engine dipstick/oil plug g
a
B. Frame J. High-pressure pump
English

C. High-pressure hose K. Engine

D. Spray gun L. Choke control k
E. Quick-connect M. Starter grip
spray wand N. Fuel valve lever Q h
F. Panel assembly O. Engine switch l
G. Nozzle holder P. Gas cap
H. High-pressure pump Q. Throttle control lever n
dipstick/oil plug m e
j
Engine o
Refer to the engine instruction manual for location
and operation of other engine controls.
b
Pump Specifications i
general tx1508
Oil: Use DP70
Oil Capacity: 14 oz. (414 ml)

Specifications
MODEL WEIGHT HEIGHT WIDTH Length PSI Max* Operating GPM Max* Operating Engine
PSI GPM
DP3400 114 lbs 29" 24" 40" 3400 3060 3.2 2.9 Honda 9 Hp
(51.7 kg) (73.7 cm) (61.0 cm) (101.6 cm) (23443 kPa) (21099 kPa) GX370
* Water flow and maximum pressure ratings determined in accordance with PWMA standard PW101.

 3. Know how to stop the product and bleed pressures quickly. Be
Definitions: Safety Guidelines thoroughly familiar with the controls.
The definitions below describe the level of severity 4. Stay alert–watch what you are doing.
for each signal word. Please read the manual and 5. Do not operate the product when fatigued or under the influence

English
pay attention to these symbols. of alcohol or drugs.
DANGER: Indicates an imminently hazardous 6. Keep operating area clear of all persons.
situation which, if not avoided, will result in death 7. Do not overreach or stand on unstable support. Keep good
or serious injury. footing and balance at all times.
WARNING: Indicates a potentially hazardous 8. Follow the maintenance instructions specified in the manual.
situation which, if not avoided, could result in death Danger: Risk of Injection or Severe Injury. Keep
or serious injury. Clear of Nozzle. Do Not Direct Discharge Stream at
CAUTION: Indicates a potentially hazardous Persons. This Product Is To Be Used Only By Trained
situation which, if not avoided, may result in minor Operators.
or moderate injury. WARNING: This product may not be equipped with a spark-
CAUTION: Used without the safety alert symbol arresting muffler. If the product is not equipped and will be used
indicates a potentially hazardous situation which, if around flam­ma­ble ma­teri­als or on land covered with materials such
not avoided, may result in property damage. as agricultural crops, forest, brush, grass or other similar items, then
an ap­proved spark arrester must be installed and is legally required
in the state of California. It is a violation of California statutes
IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT section 130050 and/or sec­tions 4442 and 4443 of the California
THIS OR ANY DeWALT TOOL, CALL US TOLL FREE AT: Public Re­sourc­es Code, unless the engine is equipped with a spark
1-800-4-DeWALT (1-800-433-9258) arrester, as defined in section 4442, and maintained in ef­fec­tive
Important Safety Instructions work­ing order. Spark arresters are also required on some U.S.
WARNING: Do not operate this unit until you read and understand For­est Service land and may also be legally required under other
this instruction manual and the engine instruction manual for safety, statutes and or­di­nanc­es.
operation and maintenance instructions. WARNING: This product contains chemicals, including lead,
Warning: When using this product basic precautions should known to the State of California to cause cancer, and birth
always be followed, including the following: defects or other reproductive harm. Wash hands after handling.
1. Read all instructions before using the product. Save these instructions
2. To reduce the risk of injury, close supervision is necessary when
a product is used near children.


 • Muffler exhaust heat can • Always keep pressure washer
damage paint­ed sur­fac­es, a min­i­mum of 4' (1.2 m) away
melt any material sen­si­tive from sur­fac­es (such as
DANGER: Risk of explosion or fire to heat (such as siding, houses, au­to­mo­biles or
English

What can happen How to prevent it plas­tic, rub­ber, vinyl or the live plants) that could be
pressure hose, itself), and damaged from muffler
• Spilled gas­o­line and it’s • Shut off en­gine and allow dam­age live plants. exhaust heat.
vapors can be­come ignited it to cool before adding fuel
from cigarette sparks, to the tank. • Improperly stored fuel could • Store fuel in an OSHA-
electrical arcing, exhaust • Use care in fill­ing tank to lead to acciden­tal ignition. ap­proved con­tain­er, in a
gas­es and hot engine avoid spill­ing fuel. Move pres- Fuel im­prop­er­ly secured se­cure location away from
components such as sure wash­er away could get into the hands of work area.
the muffler. from fueling area before children or oth­er un­qual­i­fied
persons.
start­ing en­gine.
• Use of acids, toxic or • Do not spray flammable
• Heat will ex­pand fuel in the • Keep maximum fuel level cor­ro­sive chemicals, liquids.
tank which could result in 1/2" (12.7 mm) be­low poisons, in­sec­ti­cides, or any
spillage and pos­si­ble fire bottom of filler neck kind of flam­ma­ble solvent
explosion. to allow for expansion. with this product could re­sult
• Operating the pressure • Operate and fuel equipment in se­ri­ous injury or death.
washer in an ex­plo­sive in well-ven­ti­lat­ed areas free
en­viron­ment could from ob­struc­tions. Equip
re­sult in a fire. areas with fire extinguisher
suit­able for gas­o­line fires. DANGER: RISK TO BREATHING (Asphyxiation)
What can happen How to prevent it
• Materials placed against or • Never op­er­ate pressure
near the pressure washer wash­er in an area containing • Breathing ex­haust fumes • Operate pressure washer in
can in­ter­fere with its proper dry brush or weeds. will cause se­ri­ous injury a well-ventilated area. Avoid
ventilation fea­tures caus­ing or death! En­gine exhaust en­closed areas such as
overheating and possible con­tains carbon mon­ox­ide, ga­rag­es, base­ments, etc.
ig­ni­tion of the materials. an odorless and deadly gas. • Never op­er­ate unit in a
lo­ca­tion occupied by
humans or animals.


DANGER: RISK TO BREATHING (Asphyxiation) continued • Direct spray away from self
and others.
• Some clean­ing fluids • Use only clean­ing fluids • Make sure hose and fit­tings
con­tain sub­stanc­es which spe­cif­i­cal­ly rec­om­mend­ed are tight­ened and in good

English
could cause injury to skin, for high-pressure washers. condition. Never hold onto
eyes or lungs. Fol­low manufacturers the hose or fittings during
recommendations. Do not
op­er­a­tion.
use chlorine bleach or any
other corrosive compound. • Do not allow hose to contact
muf­fler.
• Never attach or remove wand
or hose fittings while sys­tem
is pres­sur­ized.
DANGER: RISK of FLUID INJECTION and Laceration
What can happen How to prevent it • Injuries can result if system • To relieve sys­tem pres­sure,
pressure is not reduced shut off engine, turn off water
• Your pressure washer • Inspect the high-pressure before attempting sup­ply and pull gun trigger
operates at fluid pressures hose regularly. Replace maintenance or until water stops flowing.
and velocities high enough to the hose immediately if it is disassembly. • Use only accessories rated
penetrate human and damaged, worn, has melted equal to or higher than the
animal flesh, which could from contacting the engine, rating of the pressure washer.
result in amputation or or shows any signs of cracks,
other serious injury. Leaks bubbles, pinholes, or other
caused by loose fittings or leakage. Never grasp a
worn or damaged hoses can high-pressure hose that
result in injection injuries. is leaking or damaged.
DO NOT TREAT FLUID • Never touch, grasp or attempt
INJECTION AS to cover a pinhole or similar
A SIMPLE CUT! See a water leak on the high-
physician immediately! pressure hose. The stream
of water IS under high
pressure and WILL
penetrate skin.
• Never place hands in front
of noz­zle.


 Danger: RISK of unsafe operation
English

DANGER: RISK OF INJURY FROM SPRAY

What can happen How to prevent it What can happen How to prevent it
• High-velocity fluid spray • Always wear ANSI-approved • Unsafe op­er­a­tion of your • Do not use chlorine
can cause objects to break, Z87.1 safety glasses. Wear pressure wash­er could lead bleach or any other
propelling particles at high protective clothing to protect to se­ri­ous in­ju­ry or death to corrosive compound.
speed. against accidental spraying. you or others. • Be­come fa­mil­iar with the
• Never point wand at or spray op­er­a­tion and con­trols of
people or animals. the pressure washer.
• Light or unsecured objects • Always secure trigger lock • Keep operating area clear
can become hazardous when wand is not in service of all persons, pets and
projectiles. to prevent accidental obstacles.
operation. • Do not operate the product
• Never permanently secure when fatigued or under the
trigger in pull-back (open) influence of alcohol or drugs.
position. Stay alert at all times.
• Never defeat the safety
fea­tures of this prod­uct.
• Do not op­er­ate machine
with missing, broken or
un­au­tho­rized parts.
• Never leave wand
unattended while unit
is running.


• If proper starting procedure • If engine does not start after
is not followed, engine can two pulls, squeeze trigger
kickback causing serious of gun to relieve pump
hand and arm injury. pressure. Pull starter cord DANGER: Risk of Injury or Prop­er­ty Damage

English
slowly until resistance is felt. When Transporting or storing
Then pull cord rapidly to What can happen How to prevent it
avoid kickback and prevent
hand or arm injury. • Fuel or oil can leak or spill • If pressure washer is
and could result in fire or equipped with a fuel shut-off
• The spray gun/wand is • Keep chil­dren away from the breathing hazard. Se­ri­ous valve, turn the valve to the
a powerful clean­ing tool pressure washer at all times. in­ju­ry or death can re­sult. off position before transport-
that could look like a toy Fuel or oil leaks will dam­age ing to avoid fuel leaks. If pres­
to a child. carpet, paint or oth­er sure wash­er is not equipped
surfaces in ve­hi­cles with a fuel shut-off valve, drain
• Reactive force of spray • Do not over­reach or stand
or trailers. the fuel from tank before trans­
will cause gun/wand to on an unstable support.
port­ing. Only trans­port fuel in
kickback, and could cause • Do not use pressure washer an OSHA-approved container.
the op­er­a­tor to slip or fall while standing on a ladder. Al­ways place pressure washer
or misdirect the spray. • Grip gun/wand firmly with on a protective mat when
Im­prop­er control of gun/ both hands. Expect the transporting to protect against
wand can re­sult in gun to kickback when dam­age to vehicle from leaks.
in­ju­ries to self and triggered. Re­move pres­sure washer
others.
from vehicle immediately upon
arrival at your destination.


 WARNING: RISK of Bursting WARNING: RISK OF Hot surfaces
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What can happen How to prevent it What can happen How to prevent it
• Over inflation of tires could • Use a tire pressure gauge • Con­tact with hot sur­fac­es, • During op­er­a­tion, touch
result in serious injury and to check the tires pressure such as engines exhaust only the control surfaces
property damage. before each use and while com­po­nents, could result in of the pres­sure washer.
inflating tires; see the tire side- se­ri­ous burn. Keep children away from
wall for the correct tire pres- the pres­sure washer at all
sure. times. They may not be able
NOTE: Air tanks, to recognize the haz­ards of
compressors and similar this product.
equipment used to inflate
tires can fill small tires similar
to these very rapidly. Adjust
pressure regulator on air
supply to no more than the WARNING: RISK of chemical burn
rating of the tire pressure. What can happen How to prevent it
Add air in small increments
and frequently use the tire • Use of acids, toxic or • Do not use ac­ids, gasoline,
gauge to prevent over corrosive chemicals, poisons, ker­o­sene, or any other
inflation. in­sec­ti­cides, or any kind of flammable materials in this
flam­ma­ble solvent with this product. Use only household
product could re­sult in se­ri­ de­ter­gents, cleaners and
ous injury or death. degreasers recommended
for use in pres­sure washers.
• Wear pro­tec­tive clothing
to protect eyes and skin
from con­tact with sprayed
materials.


 2. Attach high-pressure hose (C) to spray gun (D). Make sure it is
secure.
3. Connect wand (E) to spray gun. Make sure connection is
WARNING: RISK OF elec­tri­cal Shock secure.

English
What can happen How to prevent it
• Spray di­rect­ed at elec­tri­cal • Unplug any elec­tri­cal­ly
outlets or switch­es, or ob­jects op­er­at­ed product before
con­nect­ed to an elec­tri­cal attempting to clean it. Direct
circuit, could re­sult in a spray away from electric
fatal electrical shock. out­lets and switches.

4. Place the nozzle holder (G)

onto the panel assembly (F)
and push each nozzle holder
WARNING: RISK OF INJURY FROM LIFTING into place.
What can happen How to prevent it 5. Remove the five colored
• Serious injury can result • The pressure washer is too quick-connect nozzles from
from attempting to lift too heavy to be lifted by one the plastic bag and insert
heavy an object. person. Obtain assistance them into correct grommet on the nozzle holder.
from others before lifting. Nozzles are color coded to match colored
nozzles on panel assembly.
SAVE THESE INSTRUCTIONS 6. Using a 7/8" wrench, remove shipping plug
FOR FUTURE USE from pump by turning it counterclockwise.
Discard shipping plug.
INSTALLATION NOTE: The high-pressure pump was filled with
Pressure Washer Assembly (Fig. 1) oil at the factory. Always check oil level before
1. Place handle assembly (A) onto frame, depress the snap using (refer to Maintenance for more
buttons, and slide the handle assembly onto the frame (B) until information).
snap buttons are secured in place.
Caution: Risk of personal injury. Avoid placing hands between
handle and frame when assembling to prevent pinching.


 7. Remove dipstick/oil plug (H) from plastic bag and Spray Wand Nozzles (Fig. 1)
install into pump, tighten securely. The nozzles for the spray wand are stored in the nozzle holder (G) on
h
NOTE: The shipping plug must be removed and the panel assembly (F). Colors on the panel identify nozzle location
replaced with the dipstick/oil plug before operat- and spray pattern. Refer to the following chart to choose the correct
English

ing pressure washer. nozzle for the job to be performed.

Warning: Risk of bursting. Use a tire pressure
gauge to check the tires pressure before each use and while inflating Nozzle Color Spray Pattern Uses Surfaces*
tires; see the tire sidewall for the correct tire pressure. 0˚ powerful metal or
NOTE: Air tanks, compressors and similar equipment used to pinpoint for concrete;
inflate tires can fill small tires similar to these very rapidly. Adjust Red very intense DO NOT use
pressure regulator on air supply to no more than the rating of the cleaning on wood
tire pressure. Add air in small increments and frequently use the
tire gauge to prevent over inflation. 15˚ intense metal, concrete
cleaning of or wood
Yellow
OPERATION small areas

Pressure Adjustments
The pressure setting is preset at the factory to achieve op­ti­mum pres­ 25˚ intense metal, concrete
sure and cleaning. To lower the pres­sure, follow these instructions. cleaning of or wood
Green larger areas
1. Back away from the sur­face to be cleaned. The further away you
are, the less the pressure will be on the surface to be cleaned.
2. Change to the 40˚ nozzle (white). This nozzle delivers a less 40˚ covers wide metal, concrete,
powerful stream of water and a wider spray pattern. Refer to areas of wood or vinyl
Spray Wand Nozzles. White cleaning
3. Adjust the pres­sure reg­u­la­tor on the
pump. Turn the pressure reg­u­la­tor knob (R) R
coun­ter­clock­wise to lower pressure. Once low pressure applies cleaning metal, concrete,
you have fin­ished using your pres­sure wash­ solutions wood or vinyl
er, re­turn the pres­sure reg­u­la­tor to its origi- Black
nal position by turning it clock­wise.
Caution: Do not try to turn pressure regula-
tor knob past the built-in stop or damage to the
pump will result.

10
 To apply chemicals and solvents
* Caution: The high-pressure spray from your pressure washer
is capable of causing damage to surfaces such as wood, glass, 1. Press chemical hose (S) onto barbed S
automobile paint, auto striping and trim, delicate objects such fitting located near high pressure hose
as flowers and shrubs. Before spraying, check the item to connection of pump as shown.

English
be cleaned to assure yourself that it is strong enough to resist 2. Place the other end of chemical hose
damage from the force of spray. with filter on it into the container holding
chemical/cleaning solution.
NOTE: For every 7 gallons (26.5 liters)
Changing Nozzles on Spray Wand of water pumped 1 gallon (3.8 liters) of chemical/cleaning solution
Danger: Risk of fluid injection. Do not direct discharge stream will be used.
toward persons, unprotected skin, eyes or any pets or animals. 3. Install low-pressure (black) nozzle into quick connect fitting of spray
Serious injury will occur. wand, refer Spray Wand Nozzles.
warning: Flying objects could cause risk of serious injury. Do 4. After use of chemicals, place chemical hose into container of clean
Not attempt to change nozzles while pressure washer is running. water and draw clean water through chemical injection system
Turn engine off before changing nozzles. to rinse system thoroughly. If chemicals remain in the pump it
1. Pull quick-connect coupler back and insert could be damaged. Pumps damaged due to chemicals will not be
nozzle. covered under warranty.
2. Release quick-connect coupler and NOTE: Chemicals and soaps will not siphon when spray wand is in the
twist nozzle to make sure it is secure in high-pressure setting.
coupler.
Warning: Flying object could cause risk Starting
of serious injury. Ensure nozzle is completely Warning: To reduce the risk of injury, read the pressure washer
inserted in quick-connect socket and quick- instruction manual and the engine instruction manual before starting
connect snap ring is fully engaged (forward) pressure washer.
before squeezing gun trigger. DANGER: Risk of fluid injection and laceration. When using the high-
pressure setting, DO NOT allow the high-pressure spray to come in
contact with unprotected skin, eyes, or with any pets or animals. Serious
Chemicals and Cleaning Solvents injury will occur.
Applying chemicals or cleaning solvents is a low-pressure operation. • Your washer operates at fluid pressures and velocities high
NOTE: Use only soaps and chemicals designed for pressure washer enough to penetrate human and animal flesh, which could result
use. Do not use bleach. in amputation or other serious injury. Leaks caused by loose fit-
tings or worn or damaged hoses can result in injection injuries.
DO NOT TREAT FLUID INJECTION AS A SIMPLE CUT! See a
physician immediately!
11
 WARNING: Risk of fire, asphyxiation and burning. Never fill fuel 2. Check engine oil level. Refer to the engine instruction manual for
tank when engine is running or hot. Do not smoke when filling fuel tank. correct procedure.
• Never fill fuel tank completely. Fill tank to 1/2" (12.7 mm) below 3. Connect the water hose to the water source. Turn the water source
bottom of filler neck to provide space for fuel expansion. Wipe any on to remove all air from the hose. When a steady stream of water
English

fuel spillage from engine and equipment before starting engine. is present, turn the water source off.
• Never run engine in­doors or in en­closed, poorly ven­ti­lat­ed 4. Verify the filter screen (U) is in water inlet of pump.
areas. En­gine exhaust con­tains carbon mon­ox­ide, an odorless The cone side faces out.
and deadly gas. 5. Connect the cold water source (V) to pump inlet.
• DO NOT let hoses come in contact with very hot engine NOTE: Water source must provide a minimum of
muffler during or immediately after use of your pressure 5 gallons per minute at 20 pSI. U
washer. Damage to hoses from contact with hot engine Warning: To reduce the possibility of contamination always pro-
surfaces will NOT be covered by warranty. tect against backflow when connected to a potable water system.
CAUTION: Never pull water supply hose to move pres­sure washer. 6. Connect high-pressure hose (C) to pump
This could damage hose and/or pump inlet. outlet. c
• DO NOT use hot water, use cold water only. 7. If applying a chemical or cleaning solution,
• Never turn water supply off while pressure washer engine is refer to Chemicals and Cleaning
running or damage to pump will result. Solvents.
• DO NOT stop spraying water for more than two 8. Turn the water source on.
T
minutes at a time. Pump operates in bypass Caution: Risk of property damage. Failure
mode when spray gun trigger is not pressed. V
to do so could cause damage to the pump.
When the temperature inside the pump rises
9. Remove all air from the pump and high pressure hose by depress-
too high the thermal relief valve (T) will open
ing trigger until a steady stream of water is present.
and release a gush of water in an effort to lower
the temperature inside the pump. The thermal 10. Start engine. Refer to the engine instruction manual for correct
relief valve will then close. If pump is left in bypass mode for procedure.
more than two minutes internal components of the pump can Warning: Risk of unsafe operation. If engine does not start
be damaged. after two pulls, squeeze trigger of gun to relieve pump pressure. Pull
starter cord slowly until resistance is felt. Then pull cord rapidly to
Start-up Procedure avoid kickback and prevent hand or arm injury.
1. In a well-ventilated outdoor area, add fresh, high-quality, unleaded 11. Depress trigger on gun to start water flow.
gasoline with a pump octane rating of 86 or higher. Do not overfill. Warning: Risk of unsafe operation. Stand on a stable
Wipe up spilled fuel before starting the engine. Refer to engine surface and grip gun/wand firmly with both hands. Expect the gun to
instruction manual for correct procedure. kickback when triggered.
12
12. Release trigger to stop water flow. a routine maintenance schedule should be prepared and followed.
DANGER: Risk of injury from spray. Engage the If the pressure washer is used in unusual conditions, such as high
W temperatures or dusty conditions, more fre­quent maintenance
trigger lock (W) when gun is not in use to prevent
accidental spraying. checks will be required.

English
13. Adjust spray for the task being performed by Engine
changing quick connect nozzle. Refer to Spray Consult the engine instruction manual for the man­u­fac­tur­er's recom-
Wand Nozzles. mendations for any and all maintenance.
Shutting Down NOTE: The pressure washer frame is equipped with an oil drain
1. If chemicals were applied, place the chemical hose into a hole to help make changing the engine oil easier.
container of clean water and draw clean water through chemical Pump
injection system to rinse system thoroughly.
NOTE: The pump was filled with oil at the factory.
Caution: Risk of property damage Failure to do so could cause 1. Change pump oil after the first 10 hours of operation and every
damage to the pump. 250 hours thereafter.
2. Turn engine off. Refer to the engine instruction manual.
Caution: Risk of property damage. Never turn water supply off To Check Oil
while pressure washer engine is running or damage to pump will 1. The oil level should come to the dot in the middle of the sight
result. glass (X).
3. Turn water source off. How To Change H
4. Pull trigger on spray gun to relieve any water pressure in hose or Pump Oil
spray gun. 1. Loosen pump dipstick/oil
5. Refer to Storage for proper storage procedures. plug (H). X
2. Place a container under
MAINTENANCE the oil drain plug (Y).
WARNING: Risk of burning. When performing maintenance, you
3. Remove pump oil drain
may be exposed to hot surfaces, water pressure or moving parts that
can cause serious injury or death. plug. Y
WARNING: Risk of fire. Always disconnect, spark plug wire, let the 4. After oil is drained, replace
engine cool and release all water pressure before performing any oil drain plug. Tighten securely.
maintenance or repair. The engine contains flammable fuel. Do not 5. Remove pump dipstick/oil plug and fill with 14 oz. (414 ml) of
smoke or work near open flames while performing maintenance. DP70 pump oil. If DP70 is not available use 30W non-detergent
To ensure efficient operation and longer life of your pressure washer, oil.

13
 6. Replace pump dipstick/oil plug and tighten securely. 3. Reinsert filter into water inlet of pump. Cone
side faces out.
Nozzle Cleaning NOTE: Do not operate pressure washer without
If the nozzle becomes clogged with foreign materials, such as dirt, filter properly installed.
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excessive pressure may develop. If the nozzle becomes partially

clogged or restricted, the pump pressure will pulsate. Clean the
nozzle immediately using the nozzle kit supplied and the following U
instructions:
1. Shut off the pressure washer and turn off the water supply. To Remove Tires
2. Pull trigger on gun handle to relieve any water pressure. 1. Using a 1/8" hex head wrench loosen set
3. Disconnect the spray wand from the gun. screw in hub collar.
Z
4. Remove the high-pressure nozzle from 2. Slide hub collar from axle and remove the
the spray wand. Remove any obstructions tire.
with the nozzle cleaning tool (Z) provided
and back flush with clean water. sTORAGE
5. Direct water supply into spray wand to Engine
back flush loosened particles for 30 Consult the engine instruction manual for the man­u­fac­tur­er's
seconds. recommendations for storage.
6. Reassemble the nozzle to the wand.
7. Reconnect spray wand to gun then turn on water supply. Pump
8. Start pressure washer and place spray wand into high pressure The manufacturer recommends using a pump protector/winterizer,
setting to test. such as DP80 when storing the unit for more than 30 days and/or
when freezing temperatures are expected. DP80 is availabe at the
To Clean the Water Inlet Filter store where the pressure washer was purchased. If a pump protector/
This filter screen (U) should be checked periodically and cleaned if winterizer is not available, RV antifreeze or windshield washer fluid
necessary. needs to be run through the pump as outlined in the steps below.
1. Remove the filter screen (U) by grasping the NOTE: Using a pump protector/ winterizer, RV antifreeze or wind-
end and removing it from water inlet of shield washer fluid is to provide proper lubrication to the internal
U
pump. seals of the pump regardless of temperature or environment.
2. Clean filter by flushing it with water on both 1. Obtain a funnel, 6 oz. (170 mL) of RV antifreeze or windshield
sides. washer fluid, and 16–36" (40–91cm) of garden hose with a male
hose connector attached to one end.

14
CAUTION: Risk of property damage. Use only RV antifreeze. Any Accessories
other an­ti­freeze is corrosive and can damage pump. Recommended accessories for use with your tool are available for
2. Disconnect spark plug wire. purchase from your local dealer or authorized service center. If you
3. Connect length of garden hose to water inlet of pump. need assistance in locating any accessory for your tool, please con-

English
4. Add RV antifreeze or windshield tact DeWALT Industrial Tool Co., 701 East Joppa Road, Baltimore,
washer fluid to hose as shown. MD 21286, call 1-800-4-DeWALT (1-800-433-9258) or visit our web-
5. Pull engine starter rope slowly site www.dewalt.com.
several times until an­ti­freeze/ CAUTION: The use of any other accessory not recommended for
washer fluid comes out of high- use with this tool could be hazardous. Use only accessories rated
pressure hose con­nec­tion of equal to or higher than the rating of the pressure washer.
pump.
6. Remove garden hose from Service Information
water inlet of pump. Please have the following information available for all service calls:
7. Reconnect spark plug wire. Model Number ____________ Serial Number ___________
Date and Place of Purchase ____________________________
Pressure Washer
1. Drain all water from high- Repairs
pressure hose, coil it and store it To assure product SAFETY and RELIABILITY, repairs, maintenance
in cradle of the pressure washer and adjustment should be performed by a DeWALT factory service
handle. center, a DeWALT authorized service center or other qualified
2. With nozzle pointed down and service personnel. Always use identical replacement parts.
the spray gun and wand in a Limited Warranty
vertical position, squeeze trigger
DeWALT pressure washers are warranted for one year from the
to drain all water from spray gun date of purchase. DeWALT will repair, without charge, any defects
and wand. Store in gun holder. due to faulty materials or workmanship. For further detail of
3. Store chemical hose so it is protected from dam­age. warranty coverage and warranty repair information, visit
4. If space is needed, handles may be removed and attached as www.dewalt.com or call 1-800-4-DeWALT (1-800-433-9258). This
shown. warranty does not apply to accessories or damage caused where
Caution: Risk of personal injury. Avoid placing hands between repairs have been made or attempted by others. This warranty gives
handle and frame when assembling to prevent pinching. you specific legal rights and you may have other rights which vary in
certain states or provinces. The product’s engine is covered by the
engine manufacturer’s warranty.

15
 Latin America: This warranty does not apply to products sold in
Latin America. For products sold in Latin America, see country spe-
cific warranty information contained either in the packaging, call the
local company or see website for warranty information.
English

FREE WARNING LABEL REPLACEMENT: If your warning labels

become illegible or are missing, call 1-800-4-DeWALT for a free
replacement.

16
Glossary

English
Bypass mode: Allows water to re-circulate within pump when the gun trigger is not pulled.
Chemical hose: Feeds cleaning agents into the pump to mix with the water. Refer to Chemicals
and Cleaning Solvents.
Chemical injection system: Mixes cleaners or cleaning solvents with water to improve cleaning
effectiveness.
Choke control: Opens and closes carburetor choke valve.
CU: Cleaning Units. GPM multiplied by PSI. (GPM x PSI = CU)
Fuel valve lever: Opens/closes connection between fuel tank and carburetor.
GPM: Gallons Per Minute. The unit of measure for the flow rate of water.
PSI: Pounds per Square Inch. The unit of measure for water pressure. Also used for air pressure,
hydraulic pressure, etc.
Quick-connect spray wand: Allows the user to quickly change out high-pressure nozzles. Refer
to Spray Wand Nozzles.
Thermal relief valve: When the temperature inside the pump rises too high the valve will open and
release a gush of water in an effort to lower the temperature inside the pump. The valve will
then close.
Water supply: All pressure washers must have a source of water. The minimum requirements for a
water supply are 20 PSI and 5 gallons per minute.

17
English

Troubleshooting Guide
This section provides a list of the more frequently encountered malfunctions, their causes and corrective actions. The
operator or maintenance personnel can perform some corrective actions, and others may require the assistance of a
qualified DeWALT technician or your dealer.
Problem Code
Engine will not start .......................................................................................................1, 2, 3, 4, 5, 6, 7, 8
(refer to the engine's instruction manual for further engine troubleshooting)
No or low pressure (initial use)......................................................................................9, 10, 11, 12, 13, 14, 15, 16
Will not draw chemicals..................................................................................................16, 17, 18, 19, 20, 21
No or low pressure (after period of normal use)............................................................22, 23, 24
Water leaking at gun/spray wand connection................................................................25, 26
Water leaking at pump...................................................................................................25, 26, 27, 28
Oil leaking at pump.........................................................................................................29, 30, 31, 32, 33, 34, 35
Pump Pulsates...............................................................................................................12

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 Troubleshooting Codes
Code possible cause POSSIBLE SOLUTION
1 No fuel. Add fuel.

English
2 Low oil. Add required amount of oil.
3 Pressure builds up after two pulls on the recoil starter or after Squeeze gun trigger to relieve pres­sure.
initial use.
4 Choke lever in the No Choke position. Move choke to the Choke po­si­tion.

5 Spark plug wire not attached. Attach spark plug wire.

6 Engine ON/OFF switch in OFF po­si­tion. Place engine ON/OFF switch in on position.
7 Choke lever in the Choke position on a hot engine or an engine Move choke to the No Choke po­si­tion.
that has been exposed to thermal heat for a long period of time.
8 Fuel valve closed. Move the fuel valve lever to the Open position.
9 Spray wand not in high pressure. See Spray Wand Nozzles under Operation.
10 Low water supply. Water supply must be at least 5 GPM @ 20 PSI.
11 Leak at high-pressure hose fitting. Repair leak. Apply sealant tape if necessary.
12 Nozzle obstructed. See Nozzle Cleaning under Maintenance.
13 Water filter screen clogged. Remove and clean filter.
14 Air in hose. Turn off the engine, then the water source. Disconnect the
water source from the pump inlet and turn the water source
on to remove all air from the hose. When there is a steady
stream of water present, turn water source off. Recon­nect
water source to pump inlet and turn on wa­ter source. Squeeze
trigger to re­move re­main­ing air.
15 Choke lever in the Choke position. Move choke to the No Choke po­si­tion.
16 High-pressure hose is too long. Use high-pressure hose under 100 feet (30.48 m). Lengthen water
supply hose instead of high-pressure hose.

19
 (Troubleshooting Codes cont.)

Code possible cause POSSIBLE SOLUTION

17 Spray wand not in low pressure. See Spray Wand Nozzles under Operation.
English

18 Chemical filter clogged. Clean filter.

19 Chemical screen not in cleaning solution. Make sure end of chemical hose is fully submerged into cleaning
solution.
20 Chemical too thick. Dilute chemical. Chemical should be the same consistency as water.
21 Worn seal or packing. Have parts cleaned or replaced by authorized service center.
22 Chemical build up in chemical injector. Have replaced by an authorized service center.
23 Worn or obstructed valves. Have replaced by authorized service center.
24 Worn unloader piston. Have replaced by authorized service center.
25 Worn or broken o-ring. Check and replace.
26 Loose hose connection. Tighten.
27 Piston packings worn. Have replaced by authorized service center.
28 Pump head or tubes damaged from freezing. Have replaced by authorized service center.
29 Oil seals worn. Have replaced by authorized service center
30 Loose drain plug. Tighten.
31 Worn drain plug o-ring Check and replace.
32 Worn fill plug o-ring. Check and replace.
33 Pump overfilled. Check for correct amount.
34 Incorrect oil used. Drain and fill with correct amount and type of oil.
35 Vent plug is clogged. Clean vent plug; blow air through it to remove any blockage. If
prob­lem per­sists, replace plug.

20
 DeWALT Industrial Tool Co., 701 Joppa Road, Baltimore, MD 21286
(MAR06) Form No. A16411 DP3400 Copyright © 2005, 2006 DeWALT
The following are trademarks for one or more DeWALT power tools: the yellow and black color scheme; the “D” shaped air intake grill; the
array of pyramids on the handgrip; the kit box configuration; and the array of lozenge-shaped humps on the surface of the tool.