Simpson 7108644 User manual

Part Number 7108644 / ENGLISH REV B - 6/2023
SAVE THIS MANUAL FOR FUTURE REFERENCE
USE AND CARE MANUAL
PRESSURE WASHER
READ THIS MANUAL CAREFULLY BEFORE OPERATION
Failure to follow the instructions and safety precautions in this manual can result
in property damage, serious injury and/or death.
NOTE: Photographs and line drawings used in this manual are for reference only and may not
represent your specic model.
If your pressure washer is not working or if there are parts missing or broken, please DO NOT
RETURN IT TO THE PLACE OF PURCHASE. Contact our Customer Service Department by calling
1-877-362-4271 or emailing [email protected]
LOOK BEFORE YOU PUMP!

Page II
NOTES
THIS PAGE WAS INTENTIONALLY LEFT BLANK

Page 1
SAVE THIS MANUAL FOR FUTURE USE
Write down the model number, serial number, and purchase date of this product in the spaces
provided below then keep this manual with the purchase receipt(s) for future reference.
Keep this manual for future reference. This manual should be considered a permanent part
of the product and stay with it. This manual should be available to anyone operating the
product(s) it covers. This manual should remain with the product(s) it covers if sold to a new
owner. If the manual becomes damaged, lost, or otherwise unusable, you may download
a new copy from the product pages at www.simpsoncleaning.com or contact customer
support by calling 1-877-362-4271.
Model Number:
Serial Number:
Purchase Date:

Page 2
TABLE OF CONTENTS
Install Button-style Handle 6
ASSEMBLY 6
DISCLAIMERS 5
PERSONAL PROTECTIVE EQUIPMENT 5
Hazard Alert Symbols 4
Additional Instructions 4
Read this Manual Before Operating 4
4SAFETY INSTRUCTIONS
Organize Accessories
Assemble the Spray Gun
7
7
COMPONENT LOCATION 8
CONNECTING HOSES 10
PURGING AIR FROM THE PUMP 11
NOZZLES 12
Nozzle Installation 12
Nozzle Selection 12
USING CHEMICALS 13
OPERATING CHECKLIST 14
High Altitude Operation
Location 14
Checking the Engine Oil
Operating Conditions
Checking Fuel
15
15
16
18
STARTING THE ENGINE 20
SHUTTING OFF THE ENGINE 21
UNPACKING 6

Page 3
Pressure Washing 22
Preparation 22
Terms 22
22OPERATION TIPS
23TROUBLESHOOTING
25MAINTENANCE
Maintenance
Cleaning the Pressure Washer
25
25
Connections
Nozzle Cleaning
25
26
Water Inlet Filter
Pump Maintenance
26
27
Engine Maintenance 27
27STORAGE AND TRANSPORTATION
Storing for Two Months or Less
Storing for More Than Two Months
27
28
Transportation 28
29USING SIMPSON®PUMP GUARD
30WARRANTY

Page 4
CAUTION:CAUTION:
NOTICE
This manual contains important safety information and instructions. Do not operate
this product until you have read, and completely understand all safety, operation, and
maintenance instructions listed in this manual. Failure to follow the information contained
in this manual will result in property damage, injury, and/or death.
NOTE: The warnings and precautions discussed in this manual cannot cover all conditions
and situations that may occur. The operator must understand awareness and caution are
factors which cannot be built into this product and so must be exercised by the operator.
READ THIS MANUAL BEFORE OPERATING
ADDITIONAL INSTRUCTIONS
Be sure to understand the safety symbols and denitions listed below. Each symbol
contains one of four words: DANGER, WARNING, CAUTION, NOTICE, indicating
di󰀨erent levels of hazard severity. These symbols are used throughout this manual and
are followed by information about a specic hazard, the consequences of the hazard, and
instructions on how to avoid the hazard. Failure to heed these symbols and follow the
instructions provided with them will result in property damage, injury, and/or death.
HAZARD ALERT SYMBOLS
Indicates an imminently dangerous situation, which if not
avoided, will result in property damage, serious injury, and/
or death.
Indicates a potentially hazardous situation, which if not
avoided, could result in property damage, serious injury, and/
or death.
Indicates a hazardous situation, which if not avoided, could
result in property damage and/or minor to moderate injury.
Indicates information considered important, but not directly
hazard related.
SAFETY INSTRUCTIONS
Along with this manual, be sure to read any additional instructions provided both on and
with the product, attached equipment, accessories, and the engine powering the product.
Pay careful attention to all additional safety rules and instructions on proper startup,
operation, and shutdown procedures. Always use any recommended protective apparel
that may be needed to operate the equipment safely.
DANGER:DANGER:
WARNING:WARNING:

Page 5
This product and the engine exhaust can expose you to chemicals which are known to
the state of California to cause cancer, birth defects, or other reproductive harm. For
more information on California Proposition 65, go to www.P65Warnings.ca.gov.
CALIFORNIA PROPOSITION 65 WARNING
POLYCYCLIC AROMATIC HYDROCARBON WARNING
The air lter element and air box assembly may contain polycyclic aromatic hydrocarbons
(PAHs). Some PAHs may cause cancer. To avoid exposure to PAHs, wear gloves when
performing air lter maintenance.
●All information in this publication was based on the latest product information available at
the time of printing. The FNA Group reserves the right to update, change, and/ improve
the product and this document at any time, without notice, and without incurring any
obligation.
● This manual may cover more than one machine. The pictures and gures in the manual
should be used for reference only. There may be di󰀨erences between your product and
the pictures, drawings, and diagrams in this manual.
DISCLAIMERS
PERSONAL PROTECTIVE EQUIPMENT (PPE)
It is important to understand what personal protective equipment (PPE) should be
utilized when using your pressure washer. Below is a list of PPE items that should
be utilized at all times when using the pressure washer.
Hearing - Ear plugs or mu󰀨s to protect your hearing.
Vision - Safety glasses or goggles to protect your eyes.
Clothing - Long pants to protected your legs from ying debris.
Shoes - Shoes that fully cover your feet to protect against debris and over spray.
NOTICE
This appliance is not intended to be used by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the appliance by a
person responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.

Page 6
UNPACKING
ASSEMBLY
Follow the steps outlined in this section to unpack and assemble your pressure washer.
If you have any questions regarding the unpacking or assembly of your pressure washer,
please have your model number and serial number ready, then contact customer support at
1-877-362-4271 or email [email protected].
1. Place the shipping carton on a solid, at surface.
2. Carefully cut the top of the carton open.
3. Carefully cut each corner of the carton from top to bottom.
4. Lay each side of the carton at on the ground.
5. Remove the contents of the carton.
Install button-style handle
1). Slide the handle (1) onto the frame (2).
2). Using your thumbs, push the buttons
in (3) then slide the handle down until the
buttons pop out locking the handle.
3). Hold the gun holder (4) to the handle.
4). Secure the gun holder with the enclosed
bolt (5) and knob (6).
2
3
5
3
1 4 6

WARNING! The threads on the lance and gun coupler can be easily cross threaded resulting
in an improper assembly. An improper assembly of the gun and lance can result in personal
injury. Do not use if the threads on the gun coupler and or lance are cross threaded.
1. Secure the lance to the gun by
carefully turning the coupler on the spray
gun until the coupler stops rotating. Do
not over tighten. Most of the threads on
the lance will not be visible if the lance
and gun are properly assembled. Be
careful not to cross-thread the gun and
lance.
Page 7
Assemble the spray gun
Attempting to start the engine incorrectly or using the pressure washer incorrectly can
result in engine and/or pressure washer damage, and may cause serious injury or death.
To avoid these hazards, be sure to read, understand, and follow the steps outlined in the
OPERATING CHECKLIST section of the owner’s manual before starting the engine, and
follow all the guidelines for proper use of the pressure washer.
OPERATING CHECKLIST
WARNING:WARNING:
Organize accessories
1. Place the spray gun and lance
assembly into the gun holder.
2. Push the nozzles into the
rubber grommets on the
dashboard. Note: the dashboard
label indicates correct nozzle
placement.
3. Hang the high-pressure hose
using the adjustable strap.
12
3

Page 8
COMPONENT LOCATION
9. Fuel tank
8. Engine control switch
7. Wheel
6. Spray wand quick connector
5. Spray gun trigger lock
4. Spray gun trigger
3. Spray gun
2. Spray gun holder
1. Fuel ller cap
4 51 2 3
8 96 7

Page 9
18. Thermal relief valve
17. Pump
16. Garden hose coupler & water inlet lter
15. High-pressure pump outlet
14. Engine starting recoil
13. Nozzle holders
12. Oil ller cap / dipstick
11. High-pressure hose
10. Hose strap
19. Spark plug
18 1915 16 17
12 13 1410 11

Page 10
Before connecting a water supply hose, be sure the water supply is capable of providing an
uninterrupted source of clean, cold water at a minimum rate of 5 gallons per minute (GPM)
and 20 pounds per square inch (PSI) of pressure. Once a proper water supply is secured,
follow the instructions below to connect both the water supply and high-pressure hoses to
the pressure washer.
CONNECTING HOSES
Verify the inlet screen is free of
any dirt or debris and is in place
with the convex side facing out.
1.
Turn on the water supply and
run for 30 seconds to purge any
debris from the supply hose.
Then, turn o󰀨 the water supply
and thread the water supply hose
into the pump inlet.
2.
Thread the high-pressure
hose connector onto the pump
high-pressure outlet.
3.
Thread the high-pressure
hose connector onto the
spray gun.
4.

Page 11
WARNING:WARNING:
NOTICE
A pressure washer pump is designed to operate with water owing through it. Water
lubricates and cools the internal components of the pump. Running a pressure washer pump
without water will severely damage the pump seals and other internal components. Damage
caused by running a pressure washer pump without water is not covered under warranty.
Be sure to follow the instructions below to correctly purge the air from your pressure washer
pump before starting the engine.
PURGING AIR FROM THE PUMP
Running a pressure washer pump without water will severely damage the pump seals
and other internal components. To avoid this hazard, make sure your water supply is
uninterrupted and at least 5 GPM at 20 PSI, and always purge the air your pressure
washer pump before starting the engine.
PUMP PURGING
1. Connect all the hoses by following the steps outlined in the CONNECTING HOSES
section of this manual then turn on the cold water source.
2. Aim the spray gun in a safe direction
then squeeze and hold the trigger for
at least 30 seconds or until the water
runs steady and all the air is purged
from the pump and hoses.
3. Check hoses and connections for leaks. If leaks are found, turn o󰀨 the machine, aim
the spray gun in a safe direction and squeeze the trigger to relieve any built up pressure
in the system. Never attempt to touch a leak in a high-pressure hose or tting. Never
attempt to repair a high-pressure hose.
The high pressures created by a pressure washer can cause uid injection injuries,
severe lacerations, amputations, and / or death. To avoid these hazards, always aim
the spray gun and lance in a safe direction when using the pressure washer and never
attempt to touch a leak in a high-pressure hose or tting.
INJECTION INJURY
Engage the trigger lock.4.

Page 12
NOZZLES
Nozzle Selection
Nozzle Installation
To place a nozzle into the spray wand, pull the quick-
connect coupler back, insert the nozzle, then release
the coupler allowing it to snap back in place. Once
installed, pull on the nozzle to make sure it secure.
The nozzles supplied with the pressure washer have specic spray patterns designed to
clean di󰀨erent surfaces. Using the incorrect nozzle can damage surfaces. Refer to the table
below to select the correct nozzle before using the pressure washer. NOTE: The selection
of nozzles included may vary with pressure washer models.
Color 5-N-1
(if equipped)
Spray
Pattern Uses Surfaces
Red 0°
Spot cleaning
hard, unpainted
surfaces and
high-reach
areas
Unpainted metal and concrete
DO NOT use on wood.
Yellow 15°
Intense
cleaning of
unpainted
surfaces
Grills, driveways, concrete
and brick walkways, unpainted
brick and stucco
Green 25°
Standard
cleaning
nozzle for most
applications
Yard tools, sidewalks, lawn
furniture, unpainted siding,
stucco, gutters, eaves,
concrete, and brick surfaces
White 40°
Cleaning
painted or
delicate
surfaces
Auto, truck, RV, marine, wood,
painted brick, painted stucco,
vinyl, and painted siding
Black Soap
Applies
cleaning
solutions
Safe on all surfaces. Always
verify compatibility of cleaning
solution(s) prior to use.
0
HIGH
PRESSURE
O
HIGH
PRESSURE
15O
PRESSURE
HIGH
25O
40
HIGH
PRESSURE
O
PRESSURE
LOW
SOAP
High-pressure spray can damage plants and other surfaces. To avoid causing damage,
cover plants before spraying near them, refer to the Nozzle Selection table in this manual
for correct nozzle selection, and test surfaces before spraying to make sure they are
strong enough to withstand high-pressure spray.
SPRAY DAMAGE
NOTICE
If the engine is running, make sure the trigger lock is
in the locked position before removing and installing
nozzles.

Page 13
SOAP
NOTICE
USING CHEMICALS
Pressure washing with volatile, ammable, or corrosive liquids could cause pressure
washer damage, re, or explosion resulting in severe injury and/or death. To avoid these
hazards, use only approved soaps and chemicals, do not attempt to pressure wash with
volatile, ammable, or corrosive liquids, and NEVER use bleach.
VOLATILE LIQUIDS
Attach the open end of the soap hose to the
barbed tting on the pump.
1.
Place the ltered end of the soap hose into a
container of soap.
2.
Insert the black nozzle into the spray wand per the
Nozzle Installation section of this manual. NOTE:
Soaps will not siphon if the black soap nozzle is
not installed on the spray wand.
4.
If the engine is running, make sure the trigger
lock is in the locked position before removing and
installing nozzles.
3.
5. After using soap, place the ltered end of the soap hose into a container of clean
water and run pressure washer drawing clean water through the hose and pump
until the system is thoroughly rinsed. If soap or other chemicals remain in the pump,
the pump could be damaged. Pump damage from soap or chemical residue is not
covered under warranty.

Page 14
WARNING:WARNING:
OPERATING CHECKLIST
Location
Place the pressure washer on a level surface outside in a well-ventilated area before
operating. Keep all ammable materials at least ve feet away from all sides of the product.
●Never use pressure washer inside a house, garage, or any other kind of enclosure even
if doors and windows are open. Run engine outside at least 20 feet (6 meters) away
from windows, doors, and vents. Carefully consider wind direction and air currents when
using pressure washer outside to avoid breathing in engine exhaust.
●Following the manufacturer’s instructions and recommendations, install battery operated
carbon monoxide alarms in any occupied buildings near the running engine.
●If you experience headache, nausea, dizziness, sleepiness, or weakness while pressure
washer is running, move to fresh air and seek medical attention immediately.
Engine exhaust contains carbon monoxide, an odorless, colorless, poisonous gas.
Running an engine indoors will kill you in minutes. Never use this product inside a house,
garage, or any other kind of enclosure even if doors and windows are open. Run engine
outside at least 20 feet (6 meters) away from windows, doors, and vents. Carefully
consider wind direction and air currents when using this product outside to avoid breathing
in engine exhaust. Always use a carbon monoxide detector in any occupied buildings
near the running engine.
TOXIC FUMES

Page 15
High Altitude Operation
Operating Conditions
This engine will have proper engine performance and emission control when it is operated
at or below an altitude of 5000 feet (1524 meters). This engine requires a high-altitude
carburetor kit to ensure proper engine performance and emission control when operated
at altitudes above 5000 feet (1524 meters). Operating the machine with the wrong engine
conguration above 5000 feet (1524 meters) may increase its emissions, decrease fuel
e󰀩ciency, and hurt performance. To obtain a high altitude carburetor kit, contact your
nearest authorized service center.
Before each use, check for loose or damaged parts, leaks, and/or any other condition
that may a󰀨ect proper operation. Repair or replace all damaged and/or defective parts
immediately. Always keep all safety guards in place and in proper working order. For safety
reasons, the manufacturer recommends all maintenance and repairs be performed by an
authorized service center.
Before starting engine, remove any excessive dirt and debris from cooling vents, exhaust,
and starter recoil areas. Always operate the pressure washer on a level surface and never
move or tip the pressure washer while operating. Use pressure washer only for its intended
purpose. If you have questions about the proper use of your pressure washer, please
contact customer support at 1-877-362-4271 or [email protected].
NOTICE
Operating the engine with a high-altitude carburetor jet kit at an altitude below 5000 feet
(1524 meters) will cause the engine to run too hot. Overheating the engine could result
in serious engine damage. To avoid this hazard, make sure the correct carburetor kit is
installed and the air/fuel mixture is set correctly for your altitude.
ALTITUDE
WARNING:WARNING:
Untrained adults and children can be seriously injured or killed if allowed to incorrectly
operate or play with running pressure washer. To avoid these hazards, be sure anyone
operating the pressure washer receives proper instructions, understands safe operation,
and has read the owner’s manual before operating this product. Do not let children
operate the pressure washer without parental supervision. Keep children and pets away
from the pressure washer while it is running. Always turn o󰀨 the pressure washer before
leaving the area.
UNTRAINED OPERATION
WARNING:WARNING:
Failure to inspect this product before use could create a hazardous situation resulting
in product damage, serious injury, and/or death. To avoid these hazards, inspect the
pressure washer before each use. Check for loose or damaged parts, signs of oil or
fuel leaks, missing guards, plugged cooling vents, or any other condition that may a󰀨ect
proper operation. Repair or replace all damaged or defective parts and keep all safety
guards in place and in proper working order before using the pressure washer.
INSPECT BEFORE OPERATING

Page 16
WARNING:WARNING:
The high pressures created by a pressure washer can cause uid injection injuries,
severe lacerations, amputations, and / or death. To avoid these hazards, always aim
the spray gun and lance in a safe direction when using the pressure washer and never
attempt to touch a leak in a high-pressure hose or tting.
INJECTION INJURY
CAUTION:CAUTION:
A running engine produces heat. The surfaces of the engine, other related components,
and engine exhaust gas get hot enough to cause mild moderate burns or ignite materials
on contact. To avoid burns, do not touch engine surfaces or exhaust gases while
operating and allow engine to cool completely before moving, touching, or performing
any maintenance. To avoid a re, keep all ammable materials at least ve feet away
from all sides of the product.
HOT SURFACES
CAUTION:CAUTION:
Hot oil can cause serious burns. To prevent getting burned when changing or checking the
engine oil, wear appropriate gloves and change the oil when the engine is warm but not hot.
HOT OIL
NOTICE
The low oil sensor (if equipped) will automatically stop the engine when the oil level falls
below the safe limit. To avoid an unexpected shutdown, check the oil level before each
use, ll to the upper limit, and always operate engine on a level surface.
LOW OIL SENSOR
WARNING:WARNING:
This product has many parts that move at high speeds. Moving parts can cause crushing
injuries, broken bones, severe lacerations, and/or traumatic amputations. To prevent
injury, never place ngers, hands, feet, or other body parts near running engine. Never
operate product with covers, shrouds, or other guards removed. Do not wear loose-tting
clothing, dangling drawstrings, or any other hanging items that could become entangled
in moving parts while operating. Tie up long hair and remove jewelry before operating.
MOVING PARTS
Checking the Engine Oil

Page 17
NOTICE
The engine is shipped from the factory without oil. Running the engine without oil will
result in severe engine damage and void the warranty. To avoid causing engine damage
and voiding the warranty, ll the engine with the recommended oil type before starting.
FILL ENGINE OIL BEFORE USE
NOTICE
Oil is a major factor in the performance and service life of any engine. Using the incorrect
oil may damage the engine and void the warranty. To avoid causing engine damage and
voiding the warranty, check and change oil as required using the correct engine oil.
USE CORRECT ENGINE OIL
Upper Oil Limit
Lower Oil Limit
1. Check oil with pressure washer on a level surface and the engine o󰀨.
2. Unscrew the engine oil dipstick and pull it out, then wipe dipstick clean.
3.
Place clean dipstick into ller neck but do not thread it in, leave it rest it on the ller neck.
4. Remove the dipstick from ller neck and check oil level. Oil level should be at the upper oil
limit on the dipstick.
5. If level is low, add the recommended oil to the crankcase until the level reaches the upper
limit on the dipstick. See the engine manual for recommended oil.
6. Install the dipstick and tighten cap by threading it into the ller neck.

Page 18
NOTICE
Old gasoline can create deposits that clog fuel systems causing hard starting and poor
performance. Damage caused by old fuel is not covered by warranty. To minimize
deposits, avoid old fuel related performance issues, and prevent costly repair work, do
not use gasoline that is older than 30 days.
OLD GASOLINE
NOTICE
Using gasoline with an alcohol blend greater than 10% (E10) will damage the engine.
Damage caused by using an alcohol blend of 15% (E15), 85% (E85), or any other alcohol
blend higher than 10% (E10) is not covered under warranty. To avoid engine damage
caused by an alcohol blend that is too high, use gasoline with 10% (E10) alcohol or lower.
ALCOHOL BLENDS
NOTICE
The use of fuel system cleaning additives can damage the engine and fuel systems.
Damage caused by the use of fuel system cleaning additives is not covered by warranty.
To avoid engine and fuel system damage, do not use any fuel system cleaning additives.
GASOLINE ADDITIVES
WARNING:WARNING:
Gasoline is highly ammable and gasoline vapors are extremely explosive. Fire and
explosions can cause severe burns and/or death. Keep gasoline away from ames,
sparks, and other ignition sources. Refuel outdoors in a well-ventilated area with the
engine stopped and cool. Wipe up any spilled gasoline and allow engine to dry before
starting. Keep a re extinguisher handy while refueling. Do not operate engine with leaks
in the fuel system. Do not store gasoline near other ammable materials.
REFUELING
Checking Fuel