Simpson MS61220 User manual

MS61220/MS61221- ENGLISH REV 2 - 01/03/2022
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.

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TABLE OF CONTENTS
SAFETY INSTRUCTIONS .............................................................. 4
DISCLAIMERS ................................................................................ 5
UNPACKING ................................................................................... 6
ASSEMBLY ..................................................................................... 6
Install knob-style handle............................................................................................... 6
Install button-style handle............................................................................................. 6
Assemble the spray gun............................................................................................... 7
Organize accessories................................................................................................... 7
COMPONENT LOCATION .............................................................. 8
CONNECTING HOSES ................................................................. 10
PURGING AIR FROM THE PUMP ................................................ 11
NOZZLES ...................................................................................... 12
Nozzle Selection......................................................................................................... 12
Nozzle Installation ...................................................................................................... 12
USING CHEMICALS ..................................................................... 13
OPERATING CHECKLIST ............................................................ 14
Location...................................................................................................................... 14
High Altitude Operation .............................................................................................. 15
Operating Conditions.................................................................................................. 15
Checking the Engine Oil............................................................................................. 16
Checking Fuel ............................................................................................................ 18

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STARTING THE ENGINE ............................................................. 20
Starting the Engine.....................................................................................................20
SHUTTING OFF ENGINE ............................................................. 21
OPERATION TIPS ........................................................................ 22
Terms.......................................................................................................................... 22
Preparation................................................................................................................. 22
Pressure Washing ...................................................................................................... 22
TROUBLE SHOOTING ................................................................. 23
MAINTENANCE ............................................................................ 24
Maintenance............................................................................................................... 24
Cleaning the Pressure Washer .................................................................................. 24
Connections ............................................................................................................... 24
Nozzle Cleaning ......................................................................................................... 25
Water Inlet Filter ......................................................................................................... 25
Pump Maintenance .................................................................................................... 26
Engine Maintenance................................................................................................... 26
STORAGE AND TRANSPORTATION .......................................... 26
Storing for Two Months or Less.................................................................................. 26
Storing for More Than Two Months ............................................................................ 27
Transportation ............................................................................................................ 27
WARRANTY INFORMATION ........................................................ 28
Limited Warranty ........................................................................................................ 28
Limited Warranty (Continued) .................................................................................... 29

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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 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.

●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.
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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.
DISCLAIMERS

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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 everything from the carton.
OR
Install knob-style handle
Install button-style handle
Slide the handle onto the frame then secure
it with the included knobs and bolts.
Press and hold buttons then slide handle
onto frame until buttons click into place.

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12
Assemble the spray gun
Organize accessories
1. Thread the lance into the spray gun.
1. Place the spray gun and lance assembly into
the holder on the dashboard.
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 on the holder.
3
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

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COMPONENT LOCATION
1. High-pressure hose
2. Hose hanger
3. Oil ll cap / dipstick
4. Pump
5. Low-pressure pump input
6. High-pressure pump output
7. Thermal relief valve
8. Fuel tank
9. Spray gun
3
9
4
7
86
5
12

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10. Nozzle holder
11. Fuel ll cap
12. Engine ignition switch
13. Engine choke
14. Fuel Valve
15. Soap Tank Cap
16. Spray wand quick connector
17. Engine starter recoil
17
10
12
16
15
13
14
11

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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
1. Verify the inlet screen is free of
any dirt or debris and is in place
with the convex side facing out.
2. 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.
3. Thread the high-pressure hose
onto the pump outlet.
4. Thread the high-pressure hose
onto the spray gun.

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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 relive 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

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Color 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 Low Pressure
Applies
cleaning
solutions
Safe on all surfaces. Always
verify compatibility of cleaning
solution(s) prior to use.
NOZZLES
Nozzle Selection
Nozzle Installation
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.
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.
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

SOAP
OR
2a. Fill soap tank with approved detergent.
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1. Attach the open end of the soap hose to the barbed
tting o the pump.
2. Place the ltered end of the soap hose into container
of soap.
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
3. 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. 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.

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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
X
X
NO NO
YES

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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].
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
Untrained persons, young children, and pets 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 young children
and pets away from the pressure washer while it is running. Always turn o󰀨 the pressure
washer before leaving the area.
Untrained persons, young children, and pets 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 young children
and pets away from the pressure washer while it is running. Always turn o󰀨 the pressure
washer before leaving the area.
UNTRAINED OPERATION
INSPECT BEFORE OPERATING

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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.
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 oil can cause serious burns. To prevent getting burned when changing or checking
the engine oil, wear gloves and change the oil when the engine is warm but not hot.
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 regularly, ll to
the upper limit, and always operate engine on a level surface.
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.
INJECTION INJURY
HOT SURFACES
HOT OIL
LOW OIL SENSOR
MOVING PARTS
Checking the Engine Oil

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Upper 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.
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.
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.
FILL ENGINE BEFORE USE
USE CORRECT ENGINE OIL
Lower Oil Limit
Engine Oil Dipstick

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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.
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.
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 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.
Gasoline vapor can build up inside the fuel tank creating pressure. This pressure may
increase when the engine is hot from running. Opening the fuel tank under pressure can
cause rapid escape of ammable vapors and possible fuel spills that may ignite from
contact with hot engine surfaces resulting in burn hazard. To avoid these hazards, always
allow the engine to cool for at least 2 minutes before removing fuel cap and loosen the
fuel cap slowly to relieve any pressure in the tank.
OLD GASOLINE
ALCOHOL BLENDS
GASOLINE ADDITIVES
REFUELING
FUEL TANK PRESSURE
Checking Fuel

Maximum Fuel Level
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NOTE: Using a fuel stabilizer (sold separately) when storing gasoline can help prevent
problems related to storing ethanol alcohol blended gasoline. Always follow the instructions
provided by the fuel stabilizer manufacturer to mix and use correctly.
It is important to prevent gum deposits from forming in essential fuel system parts, such
as the carburetor, lter(s), hoses or fuel tank during storage. Alcohol-blended fuels (also
called gasohol, ethanol, or methanol) attract moisture, which leads to separation and
formation of acids during storage. Acidic fuel and gum deposits can damage the engine’s
fuel system while in storage. Damage caused by the use of old, stale, or contaminated
fuel are not covered under warranty.
Overlling the fuel tank can result in carbon canister damage (if equipped), poor engine
performance, and void the warranty. To avoid these hazards, do not ll the fuel tank
above the maximum level.
GASOLINE STORAGE
DO NOT OVERFILL FUEL TANK
1. Check fuel with the engine o󰀨 and pressure washer on a level surface.
2. Remove fuel tank cap, check fuel level, then ll fuel tank if needed. For fuel cap location
see the COMPONENT LOCATIONS section of this manual.
3. Do not use gasoline that is older than 30 days. Use only clean and fresh regular unleaded
gasoline with a minimum octane rating of 87. Do not mix oil with gasoline. Do not use
gasoline that contains more than 10% ethyl alcohol. E15, E20, and E85 are not approved
fuels and should not be used.
4. Do not to ll the fuel tank above the maximum fuel level to allow room for fuel expansion.
For fuel capacity see the SPECIFICATIONS section of this manual.
5. Replace fuel tank cap. Never run engine without fuel cap installed.

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STARTING THE ENGINE
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
Running the pressure washer for more than two minutes without the spray gun trigger
pulled will overheat the pump and possibly cause damage. The thermal relief valve will
open and spray water to help cool the pump as it overheats. To avoid overheating the
pump, shut o󰀨 the machine if not being used for longer than two minutes.
PUMP DAMAGE
Starting the Engine
CLOSED OPEN
1. Complete the steps in the OPERATING CHECKLIST, CONNECTING HOSES, and
PRIMING THE PUMP sections of this manual before starting the engine. Failure to do
so could damage your engine and pressure washer pump. If needed, refer to the engine
manual for model specic starting instructions.
NOTE: The starting position of the choke will vary depending on the engine temperature. If
starting a cold engine, move the choke lever towards the closed position. If starting a warm
engine, move the choke lever towards the open position.
3. Turn the engine ignition switch to the ON position.
2. Turn the fuel valve on. (If equipped)
4. Adjust choke as needed.