Simpson PRO3800PW User manual

PROFESSIONAL PRESSURE WASHER
INSTRUCTION
MANUAL
SAVE THIS MANUAL FOR FUTURE REFERENCE
MAX. RPM MIN.
Part No. 7110896 Rev.AMAR2018
If your pressure washer is not working properly or if there are parts missing or
broken, please CONTACT THE PLACE YOU PURCHASED YOUR ITEM - PLEASE ENSURE THAT
YOU HAVE THE MODEL AND SERIAL NUMBER OF THE PRODUCT FOR REFERENCE
IMPORTANT: Please make certain that the person who is to use this equipment carefully reads
and understands these instructions before operating.
NOTE: Photographs and line drawings used in this manual are for reference only and do
not represent a specificmodel.

2- ENG
SAFETY GUIDELINES - DEFINITIONS
This manual contains information that is important for you to know and understand.
This information relates to protecting YOUR SAFETY and PREVENTING
EQUIPMENT PROBLEMS. To help you recognize this information, we use the
symbols below. 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.
NOTICE: Indicates a practice not related to personal injury which, if not avoided,
may result in propertydamage.
IMPORTANT SAFETY INSTRUCTIONS
DANGER: Carbon Monoxide. Using an engine indoors can kill you in
minutes. Engine exhaust contains high levels of carbon monoxide (CO), a
poisonous gas you cannot see or smell. You may be breathing CO even if you
do not smell engine exhaust.
•NEVER use an engine inside homes, garages, crawlspaces or other partly
enclosed areas. Deadly levels of carbon monoxide can build up in these areas.
Using a fan or opening windows and doors does NOT supply enough freshair.
•ONLY use outdoors and far away from open windows, doors and vents. These
openings can pull in engineexhaust.
• Even when the engine is used correctly, CO may leak into your home. ALWAYS
use a battery-powered or battery backup CO alarm in your house. Read and
follow all directions for CO alarm before using. If you feel sick, dizzy or weak
at anytime, move to fresh air immediately. See a doctor. You could have carbon
monoxidepoisoning.
WARNING: Do not operate this unit until you read this instruction manual and
the engine instruction manual for safety, operation and maintenance instructions. If
you have any questions regarding the product, please contact our customer
service department at www.simpsoncleaning.com.
DANGER: Risk of injection or severe injury. Keep clear of nozzle. Do not
direct discharge stream at persons or live animals. This product is to be used
only by trainedoperators.
WARNING: This product and its exhaust can expose you to chemicals including
lead and lead compounds, and carbon monoxide, which are known to the State of
California to cause cancer and birth defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov.
WARNING: Always wear appropriate personal hearing and other protection
during use. Under some conditions and duration of use, noise from this product
may contribute to hearing loss.

3- ENG
WARNING: This product may not be equipped with a spark-arresting muffler.
If the product is not equipped and will be used around flammable materials or
on land covered with materials such as agricultural crops, forest, brush, grass or
other similar items, then an approved spark arrester must be installed.
SAVE THESE INSTRUCTIONS
DANGER: RISK OF EXPLOSION OR FIRE
WHAT CAN HAPPEN HOW TO PREVENT IT
• Spilled gasoline and it’s vapors can
become ignited from cigarette sparks,
electrical arcing, exhaust gases and
hot engine components such as
themuffler.
• Shut off engine and allow it to cool before
adding fuel to thetank.
• Use care in filling tank to avoid spilling fuel.
Move pressure washer away from fueling
area before startingengine.
• Heat will expand fuel in the tank which
could result in spillage and possible
fireexplosion.
• Keep maximum fuel level 1/2" (12.7mm)
below bottom of filler neck to allow
forexpansion.
• Operating the pressure washer in an
explosive environment could result in
afire.
• Operate and fuel equipment in well-
ventilated areas free from obstructions.
Equip areas with fire extinguisher suitable
for gasolinefires.
• Materials placed against or near the
pressure washer can interfere with
its proper ventilation features causing
overheating and possible ignition of
thematerials.
• Never operate pressure washer in an area
containing dry brush orweeds.
• Muffler exhaust heat can damage
painted surfaces, melt any material
sensitive to heat (such as siding,
plastic, rubber, vinyl or the pressure
hose, itself), and damage liveplants.
• Always keep pressure washer a minimum
of 4' (1.2 m) away from surfaces (such
as houses, automobiles or live plants)
that could be damaged from muffler
exhaustheat.
• Improperly stored fuel could lead to
accidental ignition. Fuel improperly
secured could get into the hands of
children or other unqualifiedpersons.
• Store fuel in an OSHA approved container,
in a secure location away from workarea.
• Use of acids, toxic or corrosive
chemicals, poisons, insecticides, or
any kind of flammable solvent with
this product could result in serious
injury ordeath.
• Do not spray flammableliquids.

4- ENG
DANGER: RISK TO BREATHING (ASPHYXIATION)
WHAT CAN HAPPEN HOW TO PREVENT IT
• Breathing exhaust fumes will cause
serious injury or death! Engine
exhaust contains carbon monoxide,
an odorless and deadlygas.
• Operate pressure washer in a well-
ventilated area. Avoid enclosed areas
such as garages, basements,etc.
• Never operate unit in or near a location
occupied by humans oranimals.
• Some cleaning fluids contain
substances which could cause injury
to skin, eyes orlungs.
• Use only cleaning fluids specifically
recommended for high pressure washers.
Follow 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nozzle.
• Direct spray away from self andothers.
• Make sure hose and fittings are tightened
and in good condition. Never hold onto
the hose or fittings duringoperation.
• Do not allow hose to contactmuffler.
• Never attach or remove wand or hose
fittings while system ispressurized.
• 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 system pressure, shut off
engine, turn off water supply and pull gun
trigger until water stopsflowing.
•Use only accessories rated equal
to or higher than the rating of the
pressurewasher.

5- ENG
DANGER: RISK OF INJURY FROM SPRAY
WHAT CAN HAPPEN HOW TO PREVENT IT
• High-velocity fluid spray can cause
objects to break, projecting 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.
DANGER: RISK OF UNSAFE OPERATION
WHAT CAN HAPPEN HOW TO PREVENT IT
• Unsafe operation of your pressure
washer could lead to serious injury or
death to you orothers.
• Do not use chlorine bleach or any other
corrosivecompound.
• Become familiar with the operation and
controls 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 compromise 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 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
cleaning tool that could look like a toy
to achild.
• Keep children away from the pressure
washer at alltimes.
• Reactive force of spray will cause
gun/wand to kickback, and could
cause the operator to slip or fall or
misdirect the spray. Improper control
of gun/wand can result in injuries to
self and others.
• Do not overreach 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.

6- ENG
DANGER: RISK OF INJURY OR PROPERTY 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.
Serious injury or death can result.
Fuel or oil leaks will damage carpet,
paint or other surfaces in vehicles
ortrailers.
• Oil could fill the cylinder and damage
the engine if the unit is not stored or
transported in an upright position.
• If pressure washer is equipped with
a fuel shut-off valve, turn the valve to
the OFF position before transporting to
avoid fuel leaks. If pressure washer is not
equipped with a fuel shut-off valve, drain
the fuel from tank before transporting.
Only transport fuel in an OSHA-approved
container.
• Always place pressure washer on
a protective mat when transporting
to protect against damage to vehicle
fromleaks.
• Always transport and store unit in an
upright position. Remove pressure
washer from vehicle immediately upon
arrival at yourdestination.
DANGER: RISK OF ELECTRICAL SHOCK
WHAT CAN HAPPEN HOW TO PREVENT IT
• Spray directed at electrical outlets or
switches, or objects connected to an
electrical circuit, could result in a fatal
electricalshock.
• Unplug any electrically operated product
before attempting to clean it. Direct spray
away from electric outlets andswitches.
DANGER: RISK OF CHEMICAL BURN
WHAT CAN HAPPEN HOW TO PREVENT IT
• Use of acids, toxic or corrosive
chemicals, poisons, insecticides, or
any kind of flammable solvent with this
product could result in serious injury
ordeath.
• Do not spray acids, gasoline, kerosene,
or any other flammable materials with this
product. Use only household detergents,
cleaners and degreasers recommended
for use with pressurewashers.
• Wear protective clothing to protect
eyes and skin from contact with
sprayedmaterials.

7- ENG
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 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.
• High-velocity fluid spray directed at
pneumatic tire sidewalls (such as
found on automobiles, trailers and
the like) could damage the sidewall
resulting in serious injury.
• On pressure washers rated above
1600 PSI (11032 kPa) use the widest
fan spray (40º nozzle) and keep the
spray a minimum of 8" (20 cm) from the
pneumatic tire sidewall. Do not aim spray
directly at the joint between the tire and
rim.
WARNING: RISK OF HOT SURFACES
WHAT CAN HAPPEN HOW TO PREVENT IT
• Contact with hot surfaces, such as
engine exhaust components, could
result in seriousburn.
• During operation, touch only the control
surfaces of the pressure washer. Keep
children away from the pressure washer
at all times. They may not be able to
recognize the hazards of thisproduct.
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

8- ENG
QUICK SETUP GUIDE
WARNING: To reduce the risk of injury, read the pressure washer instruction
manual and the engine instruction manual before operating pressure washer.
IMPORTANT: Ethanol ShieldTM (sold separately) is a fuel stabilizer that helps
eliminate and prevent ethanol related problems in power equipment. Follow the
instructions on the container and add to the gasoline.
AInstall the
Handle
Slide the handle
assembly onto the
frame. (if equipped) Align
holes in the top handle
with the mounting holes
in the handle assembly.
Secure with saddle
bolts and knobs.
OR
BAdd/Check Oil
The engine
is shipped
without oil. Before
starting engine, add
the oil provided. Check
oil level prior to each
use. Refer to Engine
Owner’s Manual for
complete procedure.
CAdd Gasoline
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
Owner's Manual for
complete procedure.
QUICK START GUIDE
DANGER:
• Never run engine indoors or in enclosed, poorly ventilated areas. Engine
exhaust contains carbon monoxide, an odorless and deadly gas.
• 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.

9- ENG
1Connect Garden
Hose to Pump
Thread the
garden hose to
the pump inlet.
2Connect High
Pressure Hose
to Pump
Connect the high
pressure hose to
the pump outlet.
OR
3Connect High
Pressure Hose
to Spray Gun
Thread the other end
of the high pressure
hose to the spray gun.
OR
4Connect Spray
Wand to Spray
Gun
Thread the spray
wand into the end
of the spray gun.
5Connect QC
Nozzles to Spray
Wand
Pull quick connect
coupler back and insert
nozzle. Release quick
connect coupler and
twist nozzle to make sure
it is secure in coupler.
6Turn Water
Faucet
Completely On
Do not run the unit
without water supply
connected and turned on.
Use Cold Water Only.
7Release Air from
System
Release all
air from pump and
high pressure hose by
depressing trigger until a
steady stream of water is
present. Approximately
30 seconds.
30 S
8Start engine. See
Engine Owner's
Manual for
correct
procedure.
WARNING: This Guide is not a substitute for reading the operator's manual.
User must read and understand operator's manual before using this product.

10- ENG
GET TO KNOW THE PRESSURE WASHER
NOTE: Photographs and line drawings used in this manual are for reference
only and do not represent a specificmodel.
Compare the illustrations with your unit to familiarize yourself with the location of
various controls and adjustments. Save this manual for future reference.
MAX. RPM MIN.
G
C
B
1D
K L
H
I
J
A
E
BASIC ELEMENTS OF A PRESSURE WASHER (FIG. 1)
A. High Pressure Pump: Increases the pressure of the watersupply.
B. Engine: Drives the high pressure pump. Refer to the Engine Owner's Manual
for location and operation of enginecontrols.
C. High Pressure Hose: Carries the pressurized water from the pump to the gun
and spray wand.
D. Spray Gun: Connects with spray wand to control water flow rate, direction
andpressure.
E. Quick-Connect Spray Wand: Allows the user to quickly change out
high pressure nozzles. See How To Use Spray Wand instructions in
Operationsection.
F. Detergent Siphon Hose (not shown): Feeds cleaning agents into the pump to mix
with the water. See
How To Apply Chemicals/Cleaning Solvents instructions
in
Operation section.
G. Handle
H. Frame
I. Pump Outlet

11- ENG
J. Pump Inlet
K. Quick Connect Nozzles
L. Nozzle Holder
BASIC ELEMENTS OF AN ENGINE
Refer to the Engine Owner's Manual for location and operation of enginecontrols.
Choke Control: Opens and closes carburetor chokevalve.
Starter Grip: Pulling starter grip operates recoil starter to crankengine.
Engine Switch: Enables and disables ignitionsystem.
ASSEMBLY INSTRUCTIONS (FIG. 2–4)
1. Locate and remove all loose parts from thecarton.
2. Cut four corners of the carton from top to bottom and lay the panelsflat.
3.
(Figure 2) Slide the handle assembly (G) onto the frame (H)and secure with
saddle bolts andknobs.
OR
3. (Figure 2A) Align holes in the top handle (S) with the mounting holes in the
handle assembly (G). Insert saddle bolts (DD) through aligned holes and
secure top handle to handle assembly with knobs (EE). Tighten until snug.
NOTICE: Risk of personal injury. Avoid placing hands between handle and frame
when assembling to preventpinching.
G
H
2
EE
G
H
2A
G
S
DD
4. Remove the colored quick-connect nozzles (K) from the plastic bag and insert
them into correct grommet on the nozzle holder (L). Nozzles are color coded
to match colored nozzles on label.
K
L
2B
5. Connect wand (E) to gun (D). Tightensecurely.

12- ENG
6. Attach high pressure hose (C) to gun (D). Tightensecurely.
OR
E
4
D
C
3
D
D
C
NOTICE: The engine is shipped without oil. Before starting engine, add the oil
provided. Damage to the engine will occur if the engine is run without oil, this
damage will not be covered underwarranty.
NOTICE: The high-pressure pump was filled with oil at the factory. Always check oil
level before using (refer to Maintenance for more information).
OPERATION
PRESSURE WASHER TERMINOLOGY
PSI: Pounds per Square Inch. The unit of measure for water pressure. Also used
for air pressure, hydraulic pressure, etc.
PSI*: Pounds per Square Inch. The unit of measure for water pressure. Also used
for air pressure, hydraulic pressure, etc.
GPM*: Gallons per Minute. The unit of measure for the flow rate of water.
* Rated Pressure and Rated Water Flow is within manufacturing tolerance of
(+/- 10%).
Bypass Mode: Allows water to re-circulate within the pump when the gun trigger is
not pulled. This feature allows the operator to release the trigger gun and reposition
themselves without having to turn the engine off in between cleaningactions.
WARNING: Do not allow the unit to run for more than two minutes without
the gun trigger being pulled. This could cause overheating and damage to
the pump. When the temperature inside the pump rises too high, the thermal
relief valve will open and release a spray of water from the pump to lower the
internal temperature. The valve will thenclose.
Thermal Relief Valve (P, Fig. 5): When the temperature inside the 5P
pump rises too high, this valve will open and release a gush of
water in an effort to lower the temperature inside the pump. The
valve will thenclose. NOTE: Thermal relief valve location will vary
depending on the pump type.
Detergent Injection System: Mixes cleaners or cleaning solvents
with the water to improve cleaning effectiveness.
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. If your water
source is a well, the garden hose length can only be 30ft. (9m) max.
WARNING: To reduce the possibility of contamination always protect
against backflow when connected to a potable watersystem.

13- ENG
PRESSURE WASHER OPERATING FEATURES
PRESSURE ADJUSTMENTS (FIG. 6)
The pressure setting is preset at the factory to achieve optimum pressure and
cleaning. If you need to lower the pressure, it can be accomplished by these
methods.
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 powerful stream
of water and a wider spray pattern. Refer to How To Use SprayWand.
3. (if equipped) This pressure washer’s high
-
+
6
pressure pump is equipped with an additional
feature that allows the pressure setting to be
adjusted.
To lower the pressure, turn the pressure con-
trol knob on the pump counterclockwise to
the desired pressure.
To return the pump pressure to the factory setting, turn the pressure control
knob on the pump clockwise until itstops.
NOTICE: DO NOT overtighten the pressure control knob, if overtightened the knob
COULD break and result in immediate loss of water pressure and costly repairs to
theunit.
DIAL-N-WASH ADJUSTMENT (FIG. 7, 8) (IF EQUIPPED)
1. Choose the correct high pressure nozzle (0˚, 15˚ or 40˚) for the job to be
performed. Refer to How To Use SprayWand.
2. The Dial-N-Wash is shipped in the MAX pressure setting, the MAX pressure
bar is aligned with the arrow (R) on the collar as shown in Figure 7.
Rotating the Dial-N-Wash (Q) counterclockwise until it stops places it in the
MIN pressure setting, the arrow (R) will align with the MIN pressure bar as
shown in Figure 8.
8
R
Q
7
R
Adjust the pressure by rotating the
Dial-N-Wash (Q) clockwise for
higher pressure or
counterclockwise for lower
pressure, aligning the arrow with
the desired pressure bar on the
Dial-N-Wash.
NOTE: To apply chemicals the black low pressure nozzle must be installed and
the Dial-N-Wash must be in the MAX pressuresetting.

14- ENG
HOW TO USE SPRAY WAND
The nozzles for the spray wand are stored in the nozzle holder on the panel assembly.
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.
CHANGING NOZZLES ON SPRAY WAND (FIG. 9)
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.
1. Pull quick-connect coupler (E) back and insert nozzle (K).
KE
9
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 collar is fully engaged
(forward) before squeezing guntrigger.
NOZZLE COLOR SPRAY PATTERN USES SURFACES**
Red
0˚ powerful
pinpoint for
spot cleaning of
hard, unpainted
surfaces or for
high reach areas
unpainted metal
or concrete;
DO NOT use on wood
Yellow
15˚ intense cleaning
of unpainted
hard surfaces
grills, driveways, concrete
or brick walkways,
unpainted brick or stucco
Green
25˚ standard cleaning
nozzle for most
applications
yard tools, sidewalks, lawn
furniture, unpainted siding,
stucco, gutters and eaves,
concrete, brick surfaces
White
40˚ cleaning of
painted or
delicate surfaces
auto/RV, marine, wood,
painted brick and stucco,
vinyl, painted siding
Black
low pressure applies cleaning
solutions Low pressure spray is safe on all surfaces.
Always verify compatibility
of cleaning solution
prior touse.

15- ENG
**NOTICE: 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, and 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 the spray.
HOW TO APPLY CHEMICALS/CLEANING SOLVENTS (FIG. 10)
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:
1. Ensure detergent siphon hose (F, Figure 10) is attached F
10
to barbed fitting location near high pressure hose
connection of pump as shown. NOTE: The barbed
fitting location will vary depending on the pump type.
2. Place other end of detergent siphon hose with
filter on it into container holding chemical/cleaning
solution. NOTE: For every 7 gallons of water pumped
1 gallon of chemical/cleaning solution will beused.
3. Install low pressure (black) nozzle into quick connect fitting of spray wand, see
How To Use Spray Wand paragraph in thissection.
4. After use of chemicals, place detergent siphon 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 chemical residue will not be covered underwarranty.
NOTE: Chemicals and soaps will not siphon if the black soap nozzle is not installed
on the spraywand.
STARTING (FIG. 11–14)
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 fittings or worn or damaged hoses can result in injection
injuries. DO NOT TREAT FLUID INJECTION AS A SIMPLE CUT! See a physician
immediately!
DANGER: Carbon Monoxide. Using an engine indoors can kill you in
minutes. Engine exhaust contains high levels of carbon monoxide (CO), a
poisonous gas you cannot see or smell. You may be breathing CO even if you
do not smell engine exhaust.
• Breathing exhaust fumes will cause serious injury or death! Engine exhaust
contains carbon monoxide, an odorless and deadlygas.
• Operate pressure washer in a well-ventilated area. Avoid enclosed areas
such as garages, basements,etc.
• Never operate unit in or near a location occupied by humans oranimals.

16- ENG
WARNING: Risk of Fire, Asphyxiation and Burn. 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.
• 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.
NOTICE: Risk of property damage. Never pull water supply hose to move pressure
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 minutes at a time. Pump operates in
bypass mode when spray gun trigger is not pressed. If pump is left in bypass mode
for more than two minutes internal components of the pump can bedamaged.
If you do not understand these precautions, please contact our customer service
department at www.simpsoncleaning.com
Prior to starting, refer to your engine manual for proper starting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 Owner's Manual for correctprocedure.
IMPORTANT: Ethanol ShieldTM (sold separately) is a fuel stabilizer that helps
eliminate and prevent ethanol related problems in power equipment. Follow the
instructions on the container and add to thegasoline.
NOTICE: Use of fuels with greater than 10% ethanol are
not approved for use in this product per EPA regulations
and will damage the unit and void thewarranty.
2. Check engine oil level. Refer to Engine Owner's Manual for correct procedure.
3. Check pump oil level. The oil level should come to the dot in the middle of the
sight glass. Refer to the Pump paragraph underMaintenance.
4. 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.
5. Verify the filter screen (M) is in water inlet of pump. NOTE: Convex side
facesout.
6. Connect water source (N) to pump inlet (J). NOTE: Water source must provide
a minimum of 5 gallons per minute at 20 PSI.
7. Connect
high pressure hose (C) to pump outlet (I).
I
13
C
12
N
J
M
11
I
C
OR
WARNING: To reduce the possibility of contamination always protect
against backflow when connected to a potable watersystem.

17- ENG
8. Choose the correct nozzle for the job to be performed. See How To Use spray
Wand instructions in this section. NOTE: If applying a chemical or cleaning
solution, see How To Apply Chemicals/Cleaning Solvents instructions in
thissection.
9. Turn water source on.
NOTICE: Risk of property damage. Failure to do so could cause damage to
thepump.
10. Remove all air from the pump and high pressure hose by depressing trigger
until a steady stream of water is present.
11. Start engine. See Engine Owner's 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.
NOTE: If the oil level in the engine is low, the engine will not start. If the engine does
not start, check the oil level and add oil asneeded.
12. Depress trigger on gun to start water flow.
WARNING: Do not allow the unit to run for more than two minutes without
the gun trigger being pulled. This could cause overheating and damage to
the pump. When the temperature inside the pump rises too high, the thermal
relief valve will open and release a spray of water from the pump to lower the
internal temperature. The valve will thenclose.
WARNING: Risk of unsafe operation. Stand on a stable surface and
grip gun/spray wand firmly with both hands. Expect the gun to kick
whentriggered.
13. Release trigger to stop waterflow.
WARNING: Risk of injury from spray. Always engage 14
O
the trigger lock (O) when gun is not in use. Failure to do so
could cause accidentalspraying.
SHUTTING DOWN
1. After each use, if you have applied chemicals, place
detergent siphon hose into container of clean water and
draw clean water through chemical injection system to
rinse system thoroughly.
NOTICE: Risk of property damage. Failure to do so could cause damage to the
pump.
2. Turn engine off. See Engine Owner's Manual.
NOTICE: Risk of property damage. NEVER turn the water off with the enginerunning.
3. Turn water sourceoff.
4. Pull trigger on spray gun to relieve any water pressure in hose or spraygun.
NOTE: Failure to release system pressure will prevent removal of high pressure
hose from spray gun or pumpconnection.
5. See Storage section in this manual for proper storageprocedures.

18- ENG
MAINTENANCE
WARNING: Risk of burn hazard. 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 hazard. 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
frequent maintenance checks will berequired.
ENGINE
Consult the Engine Owner's Manual for the manufacturer's recommendations
for any and all maintenance. NOTE: The engine drain plug is located at the rear of
theunit.
PUMP (FIG. 15)
NOTE: The Pump was filled with oil at the factory. The preferred oil is SIMPSON®
Premium Pump Crankcase Oil. If this oil is not available, an SAE 15W-40 oil may
be used. Change the pump oil after the first 50hours of operation and every 100
hours thereafter, or every 3months.
TO CHECK OIL
The oil level should come to the dot in the middle of 15
CC
AA
BB
the sight glass (AA).
HOW TO CHANGE PUMP OIL
1. Loosen pump oil fill plug (BB).
2. Place a container under the pump oil drain plug
(CC).
3. Remove pump oil drainplug.
4. After oil is drained, replace pump oil drain plug.
Tightensecurely.
5. For AAATM pumps, refill using SIMPSON®Premium Pump Crankcase Oil. If this
oil is not available, an SAE 15W-40 oil may be used.
For CAT Pumps®***, refill using a non-detergent hydraulic oil (ISO 68).
6. Replace pump oil fill plug and tightensecurely.
If there is a problem with the pump contact us at www.simpsoncleaning.com
*** CAT PUMPS®is a registered trademark of Diversified Dynamics Corporation.
CONNECTIONS
Connections on pressure washer hoses, gun and spray wand should be cleaned
regularly and lubricated with light oil or lithium grease to prevent leakage and
damage to the o-rings.
NOZZLE CLEANING (FIG. 16)
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:

19- ENG
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.
4. Remove the high pressure nozzle (K) from the spray wand.
16 K
K
N
Remove any obstructions with the nozzle cleaning tool
provided and backflush with cleanwater.
5. Direct water supply (N) into nozzle to backflush loosened
particles for 30seconds.
6. Reassemble the nozzle to the wand.
7. Reconnect spray wand to gun and turn on watersupply.
8. Start pressure washer and place spray wand into high pressure setting totest.
CLEAN THE WATER INLET FILTER (FIG. 11)
This screen filter should be checked periodically and cleaned if necessary.
1. Remove filter by grasping end and removing it from water inlet of pump.
2. Clean filter by flushing it with water on bothsides.
3. Re-insert filter into water inlet of pump. NOTE: Convex side facesout.
NOTE: Do not operate the pressure washer without filter properly installed.
STORAGE
ENGINE
Consult the Engine Owner's Manual for manufacturer’s recommendations
forstorage.
TO PREVENT FUEL-RELATED PROBLEMS
1. Add Ethanol ShieldTM fuel stabilizer following the manufacturer’s instructions.
When adding a gasoline stabilizer, fill the fuel tank with fresh gasoline. If only
partially filled, air in the tank will promote fuel deterioration during storage. If
you keep a container of gasoline for refueling, be sure that it contains only
freshgasoline.
2. After adding a gasoline stabilizer, run the engine outdoors for 10 minutes
to be sure that treated gasoline has replaced the untreated gasoline in
thecarburetor.
3. Turn the fuel valve to the OFFposition.
4. Continue to run the engine until it stops from the lack of fuel in the carburetor
fuel bowl. Running time should be less than 3minutes.
PUMP
The manufacturer recommends using SIMPSON®/ POWERWASHER®Pump
Guard or equivalent when storing the unit for more than 30 days and/or when
freezing temperatures are expected. SIMPSON®/ POWERWASHER® Pump Guard
is environmentallyfriendly.
NOTE: Using pump guard helps provide proper lubrication to the internal seals of
the pump regardless of temperature or environment.
NOTICE: Risk of property damage. Use only SIMPSON®/ POWERWASHER®
Pump Guard or equivalent. Other products could be corrosive and/or contain alco-
hol which may cause pumpdamage.
1. Turn off pressure washer and disconnect hoses frompump.

20- ENG
2. Unscrew bottle valve from Pump Guard bottle and remove seal.
3. Screw bottle valve back ontobottle.
4. Attach bottle to water inlet ofpump.
5. Squeeze bottle to inject contents intopump.
6. With ignition switch off, simultaneously pull starter rope and squeeze bottle.
Repeat until protector fluid exits pump outlet. NOTE: This step may require
twopeople.
ACCESSORIES
DANGER: Risk of fluid injection. When using replacement spray wands
or guns with this pressure washer, DO NOT use a spray wand and/or spray
gun/wand combination that is shorter in length than what was provided with
this pressure washer as measured from the nozzle end of the wand to the
guntrigger.
NOTICE: The use of any other accessory not recommended for use with this tool
could be hazardous. Use only accessories rated equal to or greater than the rating
of the pressurewasher.
SERVICE INFORMATION
CONTACT THE PLACE YOU PURCHASED YOUR ITEM - PLEASE ENSURE THAT YOU
HAVE THE MODEL AND SERIAL NUMBER OF THE PRODUCT FOR REFERENCE.
LIMITED WARRANTY
The manufacturer of this product warrants that the product is free from defective
materials and workmanship, and agrees to repair or replace designated parts that
prove defective within the warranty periods below. Specific limitations/extensions
and exclusions apply. These warranties pass through to the end user and are
non-transferable. This warranty covers defects in material and workmanship. To
the extent permitted by law, the manufacturer’s warranty obligations under this
warranty are limited to the repair and replacement of defective products as
provided herein. It does not cover machines used for rental purposes. It does not
extend to normal wear and tear of moving parts or to components affected by
moving parts. Normal wear and tear items include, but are not limited to, valves
and seals, which are therefore not covered by this warranty. It does not extend to
loss, damages or expenses which are outside of the control of the manufacturer –
including damages from shipping (claims must be filed with freighter), accident,
failure to properly maintain or store the product, usage of water of poor quality,
abuse, freezing, chemical deterioration, scale build up, rust, corrosion, thermal
expansion, acts of God, misuse, or neglect. It does not extend to damage from
repairs using parts not purchased from the manufacturer or to alterations
performed by non-factory authorized personnel. To the extent permitted by law,
the manufacturer will not be liable to any persons for consequential damage, for
personal injury, or for commercial loss. Please note that this Limited Warranty is
an additional benefit to you and does not limit or affect your statutory rights.