DeWalt DP3900 Manuel utilisateur

DP3900

Pressure Washer

Laveuse à pression

Lavadora a presión

INSTRUCTION MANUAL

GUIDE D'UTILISATION

MANUAL DE INSTRUCCIONES

INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA

DE GARANTÍA. ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES

DE USAR EL PRODUCTO.

If you have questions or comments, contact us.

Pour toute question ou tout commentaire, nous contacter.

Si tiene dudas o comentarios, contáctenos.

1-800-4-DEWALT • www.dewalt.com

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English

Engine

Refer to the engine instruction manual for

location and operation of other engine

controls.

Pump Speciﬁ cations

GENERAL TX1508

Oil: Use DP70

Speciﬁ cations

MODEL WEIGHT HEIGHT WIDTH LENGTH PSI MAX* OPERATING

PSI

GPM MAX* OPERATING

GPM

ENGINE**

DP3900 135 lbs 29" 24" 40" 3750

(25856 kPa)

3375

(23270 kPa)

4.0

(15,1 L/min)

3.6

(13,6 L/min)

Honda 13 Hp

GX390

* Water flow and maximum pressure ratings determined in accordance with PWMA standard PW101

** Horsepower rating (shown as maximum output @ 3600 rpm) is in accordance with SAE J1995. Actual engine power will be lower. Engine

power depends on the application, operating speed, operating conditions and other variables.

A. Handle assemble

B. Frame

C. High-pressure hose

D. Professional Spray gun

E. Quick-connect

spray wand

F. Panel assembly

G. Nozzle holder

H. High-pressure pump

dipstick/oil plug

I. Engine dipstick/oil plug

J. High-pressure pump

K. Engine

L. Choke control

M. Starter grip

N. Fuel valve lever

O. Engine switch

P. Gas cap

Q. Throttle control lever

R. Side Handle

DP3900 PRESSURE WASHER

K

D

E

C

L

N

A

M

F

B

G

J

H

O

I

P

Q

FIG. 1

R

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IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT

THIS OR ANY D

EWALT TOOL, CALL US TOLL FREE AT:

1-800-4-D

EWALT (1-800-433-9258)

Important Safety Instructions

WARNING: Do not operate this unit until you read and understand

this instruction manual and the engine instruction manual for safety,

operation and maintenance instructions.

WARNING: When using this product basic precautions should

always be followed, including the following:

1. Read all instructions before using the product.

2. To reduce the risk of injury, close supervision is necessary when

a product is used near children.

3. Know how to stop the product and bleed pressures quickly. Be

thoroughly familiar with the controls.

4. Stay alert–watch what you are doing.

5. Do not operate the product when fatigued or under the influence

of alcohol or drugs.

6. Keep operating area clear of all persons.

7. Do not overreach or stand on unstable support. Keep good

footing and balance at all times.

8. Follow the maintenance instructions speciﬁed in the manual.

DANGER: RISK OF INJECTION OR SEVERE INJURY. KEEP

CLEAR OF NOZZLE. DO NOT DIRECT DISCHARGE STREAM AT

PERSONS. THIS PRODUCT IS TO BE USED ONLY BY TRAINED

OPERATORS.

WARNING: This product may not be equipped with a spark-

arresting muffler. If the product is not equipped and will be used

around flam ma ble ma teri als or on land covered with materials such

as agricultural crops, forest, brush, grass or other similar items, then

an ap proved spark arrester must be installed and is legally required

in the state of California. It is a violation of California statutes

section 130050 and/or sec tions 4442 and 4443 of the California

Public Re sourc es Code, unless the engine is equipped with a spark

arrester, as defined in section 4442, and maintained in ef fec tive

work ing order. Spark arresters are also required on some U.S.

For est Service land and may also be legally required under other

statutes and or di nanc es.

WARNING: This product contains chemicals, including lead,

known to the State of California to cause cancer, and birth

defects or other reproductive harm. Wash hands after handling.

SAVE THESE INSTRUCTIONS

Deﬁ nitions: Safety Guidelines

The definitions below describe the level of severity

for each signal word. Please read the manual and

pay attention to these symbols.

DANGER: Indicates an imminently hazardous

situation which, if not avoided, will result in death

or serious injury.

WARNING: Indicates a potentially hazardous

situation which, if not avoided, could result in death

or serious injury.

CAUTION: Indicates a potentially hazardous

situation which, if not avoided, may result in minor

or moderate injury.

CAUTION: Used without the safety alert symbol

indicates a potentially hazardous situation which, if

not avoided, may result in property damage.

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DANGER: RISK OF EXPLOSION OR FIRE

WHAT CAN HAPPEN HOW TO PREVENT IT

• Spilled gas o line and it’s

vapors can be come ignited

from cigarette sparks,

electrical arcing, exhaust

gas es and hot engine

components such as

the muffler.

• Shut off en gine and allow

it to cool before adding fuel

to the tank.

• Use care in fill ing tank to

avoid spill ing fuel. Move pres-

sure wash er away

from fueling area before

start ing en gine.

• Heat will ex pand fuel in the

tank which could result in

spillage and pos si ble fire

explosion.

• Keep maximum fuel level

1/2" (12.7 mm) be low

bottom of filler neck

to allow for expansion.

• Operating the pressure

washer in an ex plo sive

en viron ment could

re sult in a fire.

• Operate and fuel equipment

in well-ven ti lat ed areas free

from ob struc tions. Equip

areas with fire extinguisher

suit able for gas o line fires.

• Materials placed against or

near the pressure washer

can in ter fere with its proper

ventilation fea tures caus ing

overheating and possible

ig ni tion of the materials.

• Never op er ate pressure

wash er in an area containing

dry brush or weeds.

• Muffler exhaust heat can

damage paint ed sur fac es,

melt any material sen si tive

to heat (such as siding,

plas tic, rub ber, vinyl or the

pressure hose, itself), and

dam age live plants.

• Always keep pressure washer

a min i mum of 4' (1.2 m) away

from sur fac es (such as

houses, au to mo biles or

live plants) that could be

damaged from muffler

exhaust heat.

• Improperly stored fuel could

lead to acciden tal ignition.

Fuel im prop er ly secured

could get into the hands of

children or oth er un qual i fied

persons.

• Store fuel in an OSHA-

ap proved con tain er, in a

se cure location away from

work area.

• Use of acids, toxic or

cor ro sive chemicals,

poisons, in sec ti cides, or any

kind of flam ma ble solvent

with this product could re sult

in se ri ous injury or death.

• Do not spray flammable

liquids.

DANGER: RISK TO BREATHING (ASPHYXIATION)

WHAT CAN HAPPEN HOW TO PREVENT IT

• Breathing ex haust fumes

will cause se ri ous injury

or death! En gine exhaust

con tains carbon mon ox ide,

an odorless and deadly gas.

• Operate pressure washer in

a well-ventilated area. Avoid

en closed areas such as

ga rag es, base ments, etc.

• Never op er ate unit in a

lo ca tion occupied by

humans or animals.

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DANGER: RISK TO BREATHING (ASPHYXIATION) CONTINUED

• Some clean ing fluids

con tain sub stanc es which

could cause injury to skin,

eyes or lungs.

• Use only clean ing fluids

spe cif i cal ly rec om mend ed

for high-pressure washers.

Fol low manufacturers

recommendations. Do not

use chlorine bleach or any

other corrosive compound.

DANGER: RISK OF FLUID INJECTION AND LACERATION

WHAT CAN HAPPEN HOW TO PREVENT IT

• Your pressure washer

operates at fluid pressures

and velocities high enough to

penetrate human and

animal flesh, which could

result in amputation or

other serious injury. Leaks

caused by loose fittings or

worn or damaged hoses can

result in injection injuries.

DO NOT TREAT FLUID

INJECTION AS

A SIMPLE CUT! See a

physician immediately!

• Inspect the high-pressure

hose regularly. Replace

the hose immediately if it is

damaged, worn, has melted

from contacting the engine,

or shows any signs of cracks,

bubbles, pinholes, or other

leakage. Never grasp a

high-pressure hose that

is leaking or damaged.

• Never touch, grasp or attempt

to cover a pinhole or similar

water leak on the high-

pressure hose. The stream

of water IS under high

pressure and WILL

penetrate skin.

• Never place hands in front

of noz zle.

• Direct spray away from self

and others.

• Make sure hose and fit tings

are tight ened and in good

condition. Never hold onto

the hose or fittings during

op er a tion.

• Do not allow hose to contact

muf fler.

• Never attach or remove wand

or hose fittings while sys tem

is pres sur ized.

• When using replacement

lances or guns with this

pressure washer, DO NOT

use a lance and/or lance/gun

combination that is shorter

in length than what was

provided with this pressure

washer as measured from

the nozzle end of the lance

to the gun trigger.

• Injuries can result if system

pressure is not reduced

before attempting

maintenance or

disassembly.

• To relieve sys tem pres sure,

shut off engine, turn off water

sup ply and pull gun trigger

until water stops flowing.

• Use only accessories rated

equal to or higher than the

rating of the pressure washer.

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DANGER: RISK OF UNSAFE OPERATION

WHAT CAN HAPPEN HOW TO PREVENT IT

• Unsafe op er a tion of your

pressure wash er could lead

to se ri ous in ju ry or death to

you or others.

• Do not use chlorine

bleach or any other

corrosive compound.

• Be come fa mil iar with the

op er a tion and con trols of

the pressure washer.

• Keep operating area clear

of all persons, pets and

obstacles.

• Do not operate the product

when fatigued or under the

influence of alcohol or drugs.

Stay alert at all times.

• Never defeat the safety

fea tures of this prod uct.

• Do not op er ate machine

with missing, broken or

un au tho rized parts.

• Never leave wand

unattended while unit

is running.

DANGER: RISK OF INJURY FROM SPRAY

WHAT CAN HAPPEN HOW TO PREVENT IT

• High-velocity fluid spray

can cause objects to break,

propelling particles at high

speed.

• Always wear ANSI-approved

Z87.1 safety glasses. Wear

protective clothing to protect

against accidental spraying.

• Never point wand at or spray

people or animals.

• Light or unsecured objects

can become hazardous

projectiles.

• Always secure trigger lock

when wand is not in service

to prevent accidental

operation.

• Never permanently secure

trigger in pull-back (open)

position.

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• If proper starting procedure

is not followed, engine can

kickback causing serious

hand and arm injury.

• If engine does not start after

two pulls, squeeze trigger

of gun to relieve pump

pressure. Pull starter cord

slowly until resistance is felt.

Then pull cord rapidly to

avoid kickback and prevent

hand or arm injury.

• The spray gun/wand is

a powerful clean ing tool

that could look like a toy

to a child.

• Keep chil dren away from the

pressure washer at all times.

• Reactive force of spray

will cause gun/wand to

kickback, and could cause

the op er a tor to slip or fall

or misdirect the spray.

Im prop er control of gun/

wand can re sult in

in ju ries to self and

others.

• Do not over reach or stand

on an unstable support.

• Do not use pressure washer

while standing on a ladder.

• Grip gun/wand firmly with

both hands. Expect the

gun to kickback when

triggered.

DANGER: RISK OF INJURY OR PROP ER TY DAMAGE

WHEN TRANSPORTING OR STORING

WHAT CAN HAPPEN HOW TO PREVENT IT

• Fuel or oil can leak or spill

and could result in fire or

breathing hazard. Se ri ous

in ju ry or death can re sult.

Fuel or oil leaks will dam age

carpet, paint or oth er

surfaces in ve hi cles

or trailers.

• If pressure washer is

equipped with a fuel shut-off

valve, turn the valve to the

OFF position before transport-

ing to avoid fuel leaks. If pres-

sure wash er is not equipped

with a fuel shut-off valve, drain

the fuel from tank before trans-

port ing. Only trans port fuel in

an OSHA-approved container.

Al ways place pressure washer

on a protective mat when

transporting to protect against

dam age to vehicle from leaks.

Re move pres sure washer

from vehicle immediately upon

arrival at your destination.

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WARNING: RISK OF BURSTING

WHAT CAN HAPPEN HOW TO PREVENT IT

• Over inflation of tires could

result in serious injury and

property damage.

• Use a tire pressure gauge

to check the tires pressure

before each use and while

inflating tires; see the tire side-

wall for the correct tire pres-

sure.

NOTE: Air tanks,

compressors and similar

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

rating of the tire pressure.

Add air in small increments

and frequently use the tire

gauge to prevent over

inflation.

WARNING: RISK OF HOT SURFACES

WHAT CAN HAPPEN HOW TO PREVENT IT

• Con tact with hot sur fac es,

such as engines exhaust

com po nents, could result in

se ri ous burn.

• During op er a tion, touch

only the control surfaces

of the pres sure washer.

Keep children away from

the pres sure washer at all

times. They may not be able

to recognize the haz ards of

this product.

WARNING: RISK OF CHEMICAL BURN

WHAT CAN HAPPEN HOW TO PREVENT IT

• Use of acids, toxic or

corrosive chemicals, poisons,

in sec ti cides, or any kind of

flam ma ble solvent with this

product could re sult in se ri-

ous injury or death.

• Do not use ac ids, gasoline,

ker o sene, or any other

flammable materials in this

product. Use only household

de ter gents, cleaners and

degreasers recommended

for use in pres sure washers.

• Wear pro tec tive clothing

to protect eyes and skin

from con tact with sprayed

materials.

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WARNING: RISK OF

ELEC TRI CAL SHOCK

WHAT CAN HAPPEN HOW TO PREVENT IT

• Spray di rect ed at elec tri cal

outlets or switch es, or ob jects

con nect ed to an elec tri cal

circuit, could re sult in a

fatal electrical shock.

• Unplug any elec tri cal ly

op er at ed product before

attempting to clean it. Direct

spray away from electric

out lets and switches.

WARNING: RISK OF

INJURY FROM LIFTING

WHAT CAN HAPPEN HOW TO PREVENT IT

• Serious injury can result

from attempting to lift too

heavy an object.

• The pressure washer is too

heavy to be lifted by one

person. Obtain assistance

from others before lifting.

SAVE THESE INSTRUCTIONS

FOR FUTURE USE

INSTALLATION

Pressure Washer Assembly (Fig. 1)

1. Place handle assembly (A) onto frame, depress

the snap buttons, and slide the handle assembly

onto the frame (B) until snap buttons are secured

in place.

CAUTION: Risk of personal injury. Avoid placing

hands between handle and frame when assembling

to prevent pinching.

2. Attach high-pressure

hose (C) to quick

connect spray gun

(D). NOTE: Two hoses

(25' and 50') are

supplied, these hoses

can be connected

together or used separately. Make sure all connections are

secure.

3. Connect quick connect spray wand (E) to spray gun. NOTE: An

extension wand is also supplied with this unit, to use the exten-

sion wand: Connect the extension wand to the spray gun and

then connect the quick connect spray wand to the extension

wand. Make sure all connections are secure.

4. Remove the set screw

from spray gun exten-

sion using a 3/16" hex

wrench.

5. Thread the side han-

dle (R) into spray gun

extension and tighten

to desired position.

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6. Place the nozzle

holder (G) onto the

panel assembly (F)

and push each noz-

zle holder into

place.

7. Remove the five colored quick-connect nozzles from the plastic

bag and insert them into correct grommet on the nozzle holder.

Nozzles are color coded to match colored nozzles on panel

assembly.

8. Using a 7/8" wrench, remove

H

shipping plug from pump by

turning it counterclock-wise.

Discard shipping plug.

NOTE: The high-pressure pump

was filled with oil at the factory.

Always check oil level before using (refer to Maintenance for

more information).

9. Remove dipstick/oil plug (H) from plastic bag and install into

pump, tighten securely.

NOTE: The shipping plug must be removed and replaced with

the dipstick/oil plug before operating pressure washer.

WARNING: Risk of bursting.

Use a tire pressure gauge to check

the tires pressure before each use and while inflating tires; see the tire

sidewall for the correct tire pressure.

NOTE: Air tanks, compressors and similar 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 rating of the

tire pressure. Add air in small increments and frequently use the

tire gauge to prevent over inflation.

OPERATION

Pressure Adjustments

The pressure setting is preset at the factory to achieve op ti mum pres-

sure and cleaning. To lower the pres sure, follow these instructions.

1. Back away from the sur face 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

powerful stream of water and a wider spray pattern. Refer to

Spray Wand Nozzles.

3. Adjust the pres sure reg u la tor on the

S

pump. Turn the pressure reg u la tor knob (S)

coun ter clock wise to lower pressure. Once

you have fin ished using your pres sure wash-

er, re turn the pres sure reg u la tor to its origi-

nal position by turning it clock wise.

CAUTION: Do not try to turn pressure regula-

tor knob past the built-in stop or damage to the

pump will result.

Spray Wand Nozzles (Fig. 1)

The nozzles for the spray wand are stored in the nozzle holder (G) on

the panel assembly (F). Colors on the panel identify nozzle location

and spray pattern. Refer to the following chart to choose the correct

nozzle for the job to be performed.

Nozzle Color Spray Pattern Uses Surfaces*

Red

0˚ powerful

pinpoint for

very intense

cleaning

metal or

concrete;

DO NOT use

on wood

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1. Pull quick-connect coupler back and insert

nozzle.

2. Release quick-connect coupler and

twist nozzle to make sure it is secure in

coupler.

WARNING: Flying object could cause risk

of serious injury. Ensure nozzle is completely

inserted in quick-connect socket and quick-

connect snap ring is fully engaged (forward)

before squeezing gun trigger.

Chemicals and Cleaning Solvents

Applying chemicals or cleaning solvents is a low-pressure operation.

NOTE: Use only soaps and chemicals designed for pressure washer

use. Do not use bleach.

TO APPLY CHEMICALS AND SOLVENTS

1. Press chemical hose (T) onto barbed

T

fitting located near high pressure hose

connection of pump as shown.

2. Place the other end of chemical hose

with filter on it into the container holding

chemical/cleaning solution.

NOTE: For every 7 gallons (26.5 liters)

of water pumped 1 gallon (3.8 liters) of chemical/cleaning solution

will be used.

3. Install low-pressure (black) nozzle into quick connect fitting of spray

wand, refer Spray Wand Nozzles.

4. After use of chemicals, place chemical hose into container of clean

water and draw clean water through chemical injection system

to rinse system thoroughly. If chemicals remain in the pump it

could be damaged. Pumps damaged due to chemicals will not be

covered under warranty.

Yellow

15˚ intense

cleaning of

small areas

metal, concrete

or wood

Green

25

˚

intense

cleaning of

larger areas

metal, concrete

or wood

White

40

˚

covers wide

areas of

cleaning

metal, concrete,

wood or vinyl

Black

low pressure

applies cleaning

solutions

metal, concrete,

wood or vinyl

* CAUTION: The high-pressure spray from your pressure washer

is capable of causing damage to surfaces such as wood, glass,

automobile paint, auto striping and trim, delicate objects such

as flowers and shrubs. Before spraying, check the item to

be cleaned to assure yourself that it is strong enough to resist

damage from the force of spray.

CHANGING NOZZLES ON SPRAY WAND

DANGER: Risk of fluid injection. Do not direct discharge stream

toward persons, unprotected skin, eyes or any pets or animals.

Serious injury will occur.

WARNING: Flying objects could cause risk of serious injury. DO

NOT attempt to change nozzles while pressure washer is running.

Turn engine off before changing nozzles.

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NOTE: Chemicals and soaps will not siphon when spray wand is in the

high-pressure setting.

Starting

WARNING: To reduce the risk of injury, read the pressure washer

instruction manual and the engine instruction manual before starting

pressure washer.

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

injury will occur.

• Your washer operates at fluid pressures and velocities high

enough to penetrate human and animal flesh, which could result

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!

WARNING: Risk of fire, asphyxiation and burning. NEVER fill fuel

tank when engine is running or hot. Do not smoke when filling fuel tank.

• NEVER fill fuel tank completely. Fill tank to 1/2" (12.7 mm) below

bottom of filler neck to provide space for fuel expansion. Wipe any

fuel spillage from engine and equipment before starting engine.

• NEVER run engine in doors or in en closed, poorly ven ti lat ed

areas. En gine exhaust con tains carbon mon ox ide, an odorless

and deadly gas.

• DO NOT let hoses come in contact with very hot engine

muffler during or immediately after use of your pressure

washer. Damage to hoses from contact with hot engine

surfaces will NOT be covered by warranty.

CAUTION: NEVER pull water supply hose to move pres sure washer.

This could damage hose and/or pump inlet.

• DO NOT use hot water, use cold water only.

• NEVER turn water supply off while pressure washer engine is

running or damage to pump will result.

• DO NOT stop spraying water for more than two

U

minutes at a time. Pump operates in bypass

mode when spray gun trigger is not pressed.

When the temperature inside the pump rises

too high the thermal relief valve (U) will open

and release a gush of water in an effort to lower

the temperature inside the pump. The thermal

relief valve will then close. If pump is left in bypass mode for

more than two minutes internal components of the pump can

be damaged.

START-UP PROCEDURE

1. In a well-ventilated outdoor area, add fresh, high-quality, unleaded

gasoline with a pump octane rating of 86 or higher. Do not overfill.

Wipe up spilled fuel before starting the engine. Refer to engine

instruction manual for correct procedure.

2. Check engine oil level. Refer to the engine instruction manual for

correct procedure.

3. Connect the water hose to the water source. Turn the water source

on to remove all air from the hose. When a steady stream of water

is present, turn the water source off.

4. Verify the filter screen (V) is in water inlet of pump.

V

The cone side faces out.

5. Connect the cold water source (X) to pump inlet.

NOTE: Water source must provide a minimum of

5 gallons per minute at 20 PSI.

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English

WARNING: To reduce the possibility of contamination always pro-

tect against backflow when connected to a potable water system.

6. Connect high-pressure hose (C) to pump

X

C

outlet.

7. If applying a chemical or cleaning solution,

refer to Chemicals and Cleaning

Solvents.

8. Turn the water source on.

CAUTION: Risk of property damage. Failure

to do so could cause damage to the pump.

9. Remove all air from the pump and high pressure hose by depress-

ing trigger until a steady stream of water is present.

10. Start engine. Refer to the engine instruction manual for correct

procedure.

WARNING: Risk of unsafe operation. If engine does not start

after two pulls, squeeze trigger of gun to relieve pump pressure. Pull

starter cord slowly until resistance is felt. Then pull cord rapidly to

avoid kickback and prevent hand or arm injury.

11. Depress trigger on gun to start water flow.

WARNING: Risk of unsafe operation. Stand on a stable

surface and grip gun/wand firmly with both hands. Expect the gun to

kickback when triggered.

12. Release trigger to stop water flow.

DANGER: Risk of injury from spray. Engage the

Y

trigger lock (Y) when gun is not in use to prevent

accidental spraying.

13. Adjust spray for the task being performed

by changing quick connect nozzle. Refer to

Spray Wand Nozzles.

Shutting Down

1. If chemicals were applied, place the chemical hose into a

container of clean water and draw clean water through chemical

injection system to rinse system thoroughly.

CAUTION: Risk of property damage Failure to do so could cause

damage to the pump.

2. Turn engine off. Refer to the engine instruction manual.

CAUTION: Risk of property damage. NEVER turn water supply off

while pressure washer engine is running or damage to pump will

result.

3. Turn water source off.

4. Pull trigger on spray gun to relieve any water pressure in hose or

spray gun.

5. Refer to Storage for proper storage procedures.

MAINTENANCE

WARNING: Risk of burning. When performing maintenance, you

may be exposed to hot surfaces, water pressure or moving parts that

can cause serious injury or death.

WARNING: Risk of fire. Always disconnect, spark plug wire, let the

engine cool and release all water pressure before performing any

maintenance or repair. The engine contains flammable fuel. Do not

smoke or work near open flames while performing maintenance.

To ensure efficient operation and longer life of your pressure washer,

a routine maintenance schedule should be prepared and followed.

If the pressure washer is used in unusual conditions, such as high

temperatures or dusty conditions, more fre quent maintenance

checks will be required.

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Engine

Consult the engine instruction manual for the man u fac tur er's recom-

mendations for any and all maintenance.

NOTE: The pressure washer frame is equipped with an oil drain

hole to help make changing the engine oil easier.

Pump

NOTE: The pump was filled with oil at the factory.

1. Change pump oil after the first 10 hours of operation and every

250 hours thereafter.

TO CHECK OIL

1. The oil level should come to the dot in the middle of the sight

glass (Z).

HOW TO CHANGE

H

Z

AA

PUMP OIL

1. Loosen pump dipstick/oil

plug (H).

2. Place a container under

the oil drain plug (AA).

3. Remove pump oil drain

plug.

4. After oil is drained, replace

oil drain plug. Tighten securely.

5. Remove pump dipstick/oil plug and fill with 14 oz. (414 ml) of

DP70 pump oil. If DP70 is not available use 30W non-detergent

oil.

6. Replace pump dipstick/oil plug and tighten securely.

Nozzle Cleaning

If the nozzle becomes clogged with foreign materials, such as dirt,

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

instructions:

1. Shut off the pressure washer and turn off the water supply.

2. Pull trigger on gun handle to relieve any water pressure.

3. Disconnect the spray wand from the gun.

BB

4. Remove the high-pressure nozzle from

the spray wand. Remove any obstructions

with the nozzle cleaning tool (BB) provid-

ed and back flush with clean water.

5. Direct water supply into spray wand to

back flush loosened particles for 30

seconds.

6. Reassemble the nozzle to the wand.

7. Reconnect spray wand to gun then turn on water supply.

8. Start pressure washer and place spray wand into high pressure

setting to test.

To Clean the Water Inlet Filter

This filter screen (V) should

V

be checked periodically and

cleaned if necessary.

1. Remove the filter screen

(V) by grasping the end

and removing it from

water inlet of pump.

2. Clean filter by flushing it

with water on both sides.

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English

3. Reinsert filter into water inlet of pump. Cone side faces out.

NOTE: Do not operate pressure washer without ﬁ lter properly

installed.

To Remove Tires

1. Using a 1/8" hex head wrench loosen set

screw in hub collar.

2. Slide hub collar from axle and remove the

tire.

STORAGE

Engine

Consult the engine instruction manual for the man u fac tur er's

recommendations for storage.

Pump

The manufacturer recommends using a pump protector/winterizer,

such as DP80 when storing the unit for more than 30 days and/or

when freezing temperatures are expected. DP80 is availabe at the

store where the pressure washer was purchased. If a pump protector/

winterizer is not available, RV antifreeze or windshield washer fluid

needs to be run through the pump as outlined in the steps below.

NOTE: Using a pump protector/ winterizer, RV antifreeze or wind-

shield washer fluid is to provide proper lubrication to the internal

seals of the pump regardless of temperature or environment.

1. Obtain a funnel, 6 oz. (170 mL) of RV antifreeze or windshield

washer fluid, and 16–36" (40–91cm) of garden hose with a male

hose connector attached to one end.

CAUTION: Risk of property damage. Use only RV antifreeze. Any

other an ti freeze is corrosive and can damage pump.

2. Disconnect spark plug wire.

3. Connect length of garden hose to water inlet of pump.

4. Add RV antifreeze or windshield

washer fluid to hose as shown.

5. Pull engine starter rope slowly

several times until an ti freeze/

washer fluid comes out of high-

pressure hose con nec tion of

pump.

6. Remove garden hose from

water inlet of pump.

7. Reconnect spark plug wire.

Pressure Washer

1. Drain all water from high-

pressure hose, coil it and store it

in cradle of the pressure washer

handle.

2. With nozzle pointed down and

the spray gun and wand in a

vertical position, squeeze trigger

to drain all water from spray gun

and wand. Store in gun holder.

3. Store chemical hose so it is protected from dam age.

4. If space is needed, handles may be removed and attached as

shown.

CAUTION: Risk of personal injury. Avoid placing hands between

handle and frame when assembling to prevent pinching.

ACCESSORIES

Recommended accessories for use with your tool are available for

purchase from your local dealer or authorized service center. If you

need assistance in locating any accessory for your tool, please con-

tact D

EWALT Industrial Tool Co., 701 East Joppa Road, Baltimore,

MD 21286, call 1-800-4-D

EWALT (1-800-433-9258) or visit our web-

site www.dewalt.com.

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English

DANGER: Risk of fluid injection. When using replacement lances

or guns with this pressure washer, DO NOT use a lance and/or

lance/gun combination that is shorter in length than what was pro-

vided with this pressure washer as measured from the nozzle end

of the lance to the gun trigger.

CAUTION: The use of any other accessory not recommended for

use with this tool could be hazardous. Use only accessories rated

equal to or higher than the rating of the pressure washer.

SERVICE INFORMATION

Please have the following information available for all service calls:

Model Number ____________ Serial Number ___________

Date and Place of Purchase ____________________________

Repairs

To assure product SAFETY and RELIABILITY, repairs, maintenance

and adjustment should be performed by a D

EWALT factory service

center, a D

EWALT authorized service center or other qualified

service personnel. Always use identical replacement parts.

Limited Warranty

DEWALT pressure washers are warranted for one year from the

date of purchase. D

EWALT will repair, without charge, any defects

due to faulty materials or workmanship. For further detail of

warranty coverage and warranty repair information, visit

www.dewalt.com or call 1-800-4-D

EWALT (1-800-433-9258). This

warranty does not apply to accessories or damage caused where

repairs have been made or attempted by others. This warranty gives

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.

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.

FREE WARNING LABEL REPLACEMENT: If your warning labels

become illegible or are missing, call 1-800-4-D

EWALT for a free

replacement.

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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 D

EWALT

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

, 36

Will not draw chemicals .................................................................................................16, 17, 18, 19, 20, 21

No or low pressure (after period of normal use) ...........................................................22, 23, 24

, 36

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

Glossary

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.

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English

Troubleshooting Codes

CODE POSSIBLE CAUSE POSSIBLE SOLUTION

1 No fuel. Add fuel.

2 Low oil. Add required amount of oil.

3 Pressure builds up after two pulls on the recoil starter or after

initial use.

Squeeze gun trigger to relieve pres sure.

4 Choke lever in the NO CHOKE position. Move choke to the CHOKE po si tion.

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

6 Engine ON/OFF switch in OFF po si tion. Place engine ON/OFF switch in ON position.

7 Choke lever in the CHOKE position on a hot engine or an engine

that has been exposed to thermal heat for a long period of time.

Move choke to the NO CHOKE po si tion.

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. Recon nect

water source to pump inlet and turn on wa ter source. Squeeze

trigger to re move re main ing air.

15 Choke lever in the CHOKE position. Move choke to the NO CHOKE po si tion.

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

English

(Troubleshooting Codes cont.)

CODE POSSIBLE CAUSE POSSIBLE SOLUTION

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

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

prob lem per sists, replace plug.

36

Defective E-Z start valve.

Have replaced by authorized service center

20

Français

Caractéristiques

techniques de la pompe

GENERAL TX1508

Huile : Utiliser du DP70

Volume d’huile : 414 ml (14 onces)

A. Module de poignée

B. Cadre

C. Tuyau haute pression

D. Pistolet de pulvérisation

professionnel

E. Tube de pulvérisation à

changement rapide

F. Panneau

G. Porte-buse

H. Jauge graduée/Bouchon du

réservoir d’huile de la pompe

haute pression

I. Jauge graduée/Bouchon du

réservoir d’huile du moteur

J. Pompe haute pression

K. Moteur

L. Commande d’étrangleur

M. Poignée de démarrage

N. Levier de la soupape à

essence

O. Interrupteur moteur

P. Bouchon du réservoir

d’essence

Q. Levier de contrôle de

l’étrangleur

R. Poignée latérale

LAVEUSE HAUTE PRESSION, MODÈLE DP3900

Moteur

Se reporter au mode d’emploi du moteur pour l’emplacement et

l’utilisation des commandes moteur.

K

D

E

C

L

N

A

M

F

B

G

J

H

O

I

P

Q

FIG. 1

R

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