Generac 6602 User Manual
*Built in the USA using domestic
and foreign parts
Operator’s Manual
OneWASH™ Power Washer
www.generac.com or 1-888-436-3722
WARNING!
California Proposition 65
Engine exhaust and some of its constituents are known to the state of California to cause cancer,
birth defects, and other reproductive harm.
WARNING!
California Proposition 65
This product contains or emits chemicals known to the state of California to cause cancer,
birth defects, and other reproductive harm.
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Table of Contents
Section 1 - Introduction............................................. 1
1.1 Introduction.......................................................... 1
Section 2 - Safety........................ ... ... .... ..................... 3
2.1 Safety Rules................... .... ... ... ... .... ... ... ............... 3
Section 3 - General Information................................ 7
3.1 Know Your Power Washer................................... 7
3.2 Product Specifications ......................................... 8
3.3 Emissions Information.......................................... 8
3.4 High Altitude Operation........................................ 8
3.5 Unpacking............................................................ 9
Section 4 - Set-up........ ... ... ... .... ... ... ... .... ... ... ... .......... 11
4.1 Assembly ........................................................... 11
4.2 Add Engine Oil................................................... 12
4.3 Add Fuel............................................................. 13
4.4 Connect Hose and Water Supply to Pump........ 13
4.5 How to Use Nozzles........................................... 15
Section 5 - Operation........... .... ... ... ... .... ... ... ... .... ... ... 19
5.1 Operation........................................................... 19
5.2 Power Washer Location............................... ... ... 19
5.3 Checklist Before Starting Engine....................... 19
5.4 How to Start Your Power Washer...................... 19
5.5 Automatic Cool Down System
(Thermal Relief)................................................. 21
5.6 How to Stop Your Power Washer...................... 21
Section 6 - Maintenance.......................................... 23
6.1 Maintenance Recommendations ....................... 23
6.2 Maintenance Schedule ...................................... 23
6.3 Pump Oil.................................. ... ... .... ... ... ... .... ... 24
6.4 Emissions Control.............................. ... ... ... .... ... 24
6.5 Power Dial Settings ........................................... 24
6.6 Power Washer Maintenance.............................. 24
6.7 Check and Clean Inlet Screen........................... 24
6.8 Check High Pressure Hoses................. ... ... .... ... 24
6.9 Check Detergent Siphoning Tube............... .... ... 24
6.10 Check Spray Gun .............................................. 24
6.11 Chemical Tank Maintenance ............................. 24
6.12 Nozzle Maintenance .......................................... 25
6.13 Engine Maintenance.......................................... 26
6.14 Engine Oil Recommendations ........................... 26
6.15 Service Air Cleaner............................................ 27
6.16 Service Spark Plug ............................................ 28
6.17 Inspect Muffler and Spark Arrester.................... 28
6.18 After Each Use................................................... 29
6.19 Winter Storage................................................... 29
6.20 Long Term Storage............................................ 29
6.21 Other Storage Instructions................................. 30
6.22 Transporting/Tipping of the Unit ........................ 30
Section 7 - Troubleshooting ................................... 31
7.1 Troubleshooting Guide ...................................... 31
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Section 1 Introduction
1.1 — INTRODUCTION
Thank you for purchasing this power washer manufactured by Generac Power Systems, Inc. This model is a
high performance, air-cooled, engine-driven power
washer that operates at 3100 psi.The units feature custom designed wheels, axial cam pump with stainless
steel pistons, automatic cool down system, quick connect
nozzles, high pressure hose, detergent siphoning hose
and chemical tank.
Common sense and strict compliance with the special instructions are essential to preventing accidents. The operator must read this manual and
thoroughly understand all of the instructions and warnings before using the equipment. If any portion of the
manual is not understood, contact the nearest Au thorized
Dealer for starting, operating and servicing procedures.
The owner is responsible for proper and safe use of the
equipment.
The power washer can operate safely, efficiently and reliably only if it is properly located, operated and maintained. Before operating, servicing or storing:
• Study all warnings in this manual and on the product
carefully.
• Become familiar with this manual and the unit before
use.
• Refer to the Assembly section of the manual for
instructions on final assembly procedures. Follow the
instructions completely.
The manufacturer cannot anticipate every possible circumstance that might involve a hazard. The warnings in
this manual, and on tags and decals affixed to the unit
are, therefore, not all inclusive. If using a procedure, work
method or operating technique that the manufacturer
does not specifically recommend, ensure that it is safe for
others. Also make sure the procedure, work method or
operating technique utilized does not render the power
washer unsafe.
THE INFORMATION CONTAINED HEREIN WAS
BASED ON MACHINES IN PRODUCTION AT THE
TIME OF PUBLICATION. GENERAC RESERVES THE
RIGHT TO MODIFY THIS MANUAL AT ANY TIME.
Save these instructions for future reference. If you
loan this device to someone, always loan these
instructions and the Owner's Manual to the individual as well.
1.1.1 — Where to Find Us
You can contact Generac Customer Service by phone at
1-888-436-3722, or on the internet at www.generac.com.
Record the important information of the unit in the following chart for future reference and/or service inquiries.
Model Number
Serial Number
Date Purchased
OneWASH™ Power Washer 1
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Introduction
2 OneWASH™ Power Washer
KickbackToxic Fumes Electrical Shock
Fluid InjectionFall
Fire Explosion Operator’s Manual
Slippery Surface
Moving Parts Flying Objects Hot Surface
Hearing Protection
Section 2 Safety
2.1 — SAFETY RULES
Throughout this publication, and on tags and decals
affixed to the power washer, DANGER, WARNING, CAUTION and NOTE blocks are used to alert personnel to
special instructions about a particular operation that may
be hazardous if performed incorrectly or carelessly.
Observe them carefully. Their definitions are as follows:
Indicates a hazardous situation or action which, if
not avoided, will result in death or serious injury.
Indicates a hazardous situation or action which, if
not avoided, could result in death or serious injury.
Indicates a hazardous situation or action which, if
not avoided, could result in minor or moderate injury.
NOTE:
Notes contain additional informatio n important to a
procedure and will be found within the regular text
body of this manual.
These safety warnings cannot eliminate the hazard s th at
they indicate. Common sense and strict compliance with
the special instructions while performing the action or
service are essential to preventing acciden ts.Safety
Symbols and Meanings.
2.1.1 — Exhaust Hazards
OneWASH™ Power Washer 3
Carbon monoxide produced during use can
kill in minutes. NEVER use indoors, in a vehicle, or in other sheltered areas, EVEN IF doors
and windows are open. Only use OUTSIDE
and far away from windows, doors and vents.
Some chemicals or detergents may be harmful if inhaled or ingested, causing severe nausea, fainting, or poisoning.
• Operate power washer ONLY outdoors.
• A running engine gives off carbon monoxide.
• Carbon monoxide is an odorless, colorless, poisonous
gas. Breathing carbon monoxide can cause headache,
fatigue, dizziness, vomiting, confusion, seizures, nausea, fainting or death. If you start experiencing any of
these symptoms, IMMEDIATELY move to fresh air.
Seek medical attention.
Safety
• Keep exhaust gas from entering a confin e d ar ea
through windows, doors, ventilation intakes, or other
openings. Warn any occupants inside about the symptoms of carbon monoxide so they know to move to
fresh air if they begin to feel ill.
• The use of a carbon monoxide detector inside any
occupied premises between the power washer and the
occupant is recommended.
• NEVER start or run engine indoors, in a vehicle, or in
an enclosed area, even if windows and doors are open.
• Use a respirator or mask whenever there is a chance
that harmful gas or vapors may be inhaled.
• Read all instructions with respirator or mask so you are
certain the respirator or mask will provide the necessary protection against inhaling harmful gas or vapors.
If you begin to experience any of the CO sympto m s
listed above, IMMEDIATELY move to fresh air.
2.1.2 — Fluid Injection Hazard
NEVER aim spray gun at people, animals, or
electrical devices. Serious injury or death will
result. ALWAYS point spray gun in safe direction, squeeze spray gun trigger to release
high pressure, every time you stop engine.
Engage trigger lock when not in use.
• The high pressure stream of water that this equipment
produces can cut through skin and its underlying tissues, leading to serious injury, possible amputation or
death. Spray gun tra ps high water pressure, even
when engine is stopped and water is disconnected,
which can cause injury.
• NEVER allow CHILDREN to operate power washer or
play nearby. This is NOT a toy.
• NEVER repair high pressure hose. Replace it.
• NEVER repair leaking connections with sealant of any
kind. Replace o-ring or seal.
• NEVER connect high pressure hose to nozzle extension.
• Keep high pressure hose connec ted to pump and
spray gun while system is pressurized.
• NEVER secure spray gun in open position.
• NEVER leave spray gun unattended while machine is
running.
• NEVER use a spray gun which does not have a trigger
lock or trigger guard in place and in working order.
• Always be certain spray gun, nozzles and accessories
are correctly attached.
2.1.3 — Electrical Shock Hazard
Risk of electrocution.
Contact with power source can cause ele ctric
shock or burn.
• NEVER spray near power source.
2.1.4 — Hot Surfaces Hazard
Contact with muffler area can result in
serious burns. Exhaust heat/gases can
ignite combustibles, structures or
damage fuel tank causing a fire.
• DO NOT touch hot parts and AVOID hot exhaust
gases.
• Allow equipment to cool before touching.
• Keep at least five (5) feet (152 cm) of clearance on all
sides of power washer including overhead.
• It is a violation of California Public Resource Code,
Section 4442, to use or operate the engine on any forest-covered, brush-covered, or grass-covered land
unless the exhaust system is equipped with a spark
arrester , as defined in Section 4442, maintained in
effective working order. Other states or federal jurisdictions may have similar laws. Contact the original equipment manufacturer, retailer, or dealer to obtain a spark
arrester designed for the exhaust system installed on
this engine.
• Replacement parts must be the same and installed in
the same position as the original parts.
4 OneWASH™ Power Washer
Safety
2.1.5 — Fire Hazards
Fuel and its vapors are extremely flammable and explosive. Fire or explosion
can cause severe burns or death.
WHEN ADDING OR DRAINING FUEL
• Turn power washer OFF and let it cool at least two (2)
minutes before removing fuel cap. Loosen cap slowly
to relieve pressure in tank.
• Fill or drain fuel tank outdoors.
• DO NOT overfill tank. Allow space for fuel expansion.
• If fuel spills, wait until it evaporates before starting
engine.
• Keep fuel away from sparks, open flames, pilot lights,
heat, and other ignition sources.
• DO NOT light a cigarette or smoke.
WHEN STARTING EQUIPMENT
• Ensure spark plug, muffler, fuel cap, and air cleaner
are in place.
• DO NOT crank engine with spark plug removed.
WHEN OPERATING EQUIPMENT
• DO NOT tip engine or equipment at angle which
causes fuel to spill.
• DO NOT spray flammable liquids.
WHEN TRANSPORTING OR REPAIRING EQUIPMENT
• Transport/repair with fuel tank EMPTY.
• Disconnect spark plug wire.
WHEN STORING FUEL OR EQUIPMENT WITH FUEL
IN TANK
• Store away from furnaces, stoves, water heaters,
clothes dryers, or other appliances that have pilot light
or other ignition source because they can ignite fuel
vapors.
2.1.6 — Hearing Protection Hazard
Hearing Protection Recommended.
2.1.7 — Fall Hazard
Use of power washer can create puddles and slippery surfaces. Kickback
from spray gun can cause you to fall.
• Use only on a level surface.
• The cleaning area should have adequate slopes and
drainage to reduce the possibility of a fall due to slippery surfaces.
• Do not use on elevated surfaces where chance of kickback could result in a serious fall.
• Firmly grasp spray gun with both hands when using
high pressure spray to avoid injury when spray gun
kicks back.
2.1.8 — Moving Parts Hazard
Starter and other rotating parts can entangle
hands, hair, clothing, or accessories.
• NEVER operate power washer without protective
housing or covers.
• DO NOT wear loose clothing, jewelry or anything that
may be caught in the starter or other rotating parts.
• Tie up long hair and remove jewelry.
2.1.9 — Kickback Hazard
Starter cord kickback (rapid retraction) can
result in bodily injury . Kickback will pull hand
and arm toward engine faster than you can
let go. Broken bones, fractures, bruises, or
sprains could result.
• NEVER pull starter cord without first relieving spray
gun pressure.
• To relieve trapped pressure, point gun in safe direction
and release pressure by pulling/actuating trigger on
spray gun.
• When starting engine, pull cord slowly until resistance
is felt and then pull rapidly to avoid kickback.
• After each starting attempt, where engine fails to run,
always point spray gun in safe direction, and squeeze
spray gun trigger to release high pressure.
• Firmly grasp spray gun with both hands when using
high pressure spray to avoid injury when spray gun
kicks back.
OneWASH™ Power Washer 5
Safety
2.1.10 — Spark Hazards
Unintentional sparking can result in
fire or electric shock.
WHEN ADJUSTING OR MAKING
REP AIRS TO YOUR Power washer.
• Disconnect the spark plug wire from the sp ark plug and
place the wire where it cannot contact sp ark plug.
WHEN TESTING FOR ENGINE SPARK
• Use approved spark plug tester.
• DO NOT check for spark with spark plug removed.
2.1.11 — Splash Hazards
Risk of eye injury. Spray can splash back or
propel objects.
• Always wear safety goggles when using this equipment or in vicinity of where equipment is in use.
• Before starting the power washer, be sure you are
wearing adequate safety goggles.
• NEVER substitute safety glasses for safety goggles.
NOTE:
High pressure spray may damage fragile items
including glass.
• DO NOT point spray gun at glass when using red (0°)
MAX nozzle.
• NEVER aim spray gun at people, animals, electrical
devices or plants.
NOTE:
Improper treatment of power washer can damage it
and shorten its life.
• If you have questions about intended use, ask dealer
or contact qualified service center.
• NEVER operate units with broken or missing parts, or
without protective housing or covers.
• DO NOT by-pass any safety device on this machine.
• DO NOT operate power washer above rated pressure.
• DO NOT modify power washer in any way.
• Before starting power washer in cold weather , check all
parts of the equipment to be sure ice has not formed
there.
• NEVER move machine by pulling on hoses. Use handle provided on unit.
• Check fuel system for leaks or signs of deterioration,
such as chafed or spongy hose, loose or missing
clamps, or damaged tank or cap. Correct all defects
before operating power washer.
• This equipment is designed to be used with Generac
authorized parts ONLY. If equipment is used with parts
that DO NOT comply with minimum specifications, user
assumes all risks and liabilities.
6 OneWASH™ Power Washer
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Section 3 General Information
3.1 — KNOW YOUR POWER WASHER
Read this owner’s manual and safety rules before operating your high power washer. If you loan this device to
someone, ALWAYS loan these instructions AND the
owner’s manual to the individual as well. Compare the
illustrations with your high power washer to familiarize
yourself with the locations of various controls
(Figure 3-1). Save this manual for future reference.
Replacement owner’s manuals can be printed from the
Generac Web site.
A-Spray Gun – Controls the application of water onto
the cleaning surface with trigger device. Includes a
trigger lock.
B -Lance with Quick Connect – Allows you to switch
between different nozzles.
C -High Pressure Hose – Connect one end to water
pump and the other to the spray gun.
D -Recoil Starter – Use for starting the engine.
E -Oil Fill – Check and add engine oil.
F-Air Filter – Protects engine by filtering dust and
debris out of the intake air.
G-Pump – Develops high pressure.
H -Thermal Relief Valve – Cycles water through the
pump when water reaches 125°F warm water w ill
discharge from pump onto ground. This prevents
internal pump damage.
I -Engine On/Off Switch – Turn this switch to “ON”
before using the recoil starter. Turn the switch to
“OFF” to stop the engine.
J -Unloader Valve – Controls the high pressure output.
K -High Pressure Outlet – Connection for high pres-
sure hose.
L -Water Inlet – Connection for Garden Hose.
M -Fuel Tank – Fill tank with regular unleaded fuel.
Always leave room for fuel expansion.
O -Choke – Prepares a cold engine for starting.
P-Power Dial – Provides optimal cleaning power for
each desired application.
Q -Nozzles – Chemical injection, Blast (0°), Wash (25°),
Detergent for various high pressure cleaning applications.
R -Chemical Tank – A drain-able tank used to hold
power washer safe detergents to be siphoned into
the low pressure stream.
S -Prepare/Start Instruction – Identifies proper proce-
dure to set up and start/stop power washer.
T -Drain Plug – Used to drain engine oil.
U -Serial Number Location
V -Chemical Tank Fill Cap
W -Chemical Tank Drain Cap
OneWASH™ Power Washer 7
Figure 3-1. Features and Controls
General Information
3.1.1 — ITEMS NOT SHOWN
Identification Label (on engine blower housing) –
Provides model and serial number of power washer.
Please have these readily available if calling for assistance.
Detergent Siphoning T ube/Filter – Use to siphon power
washer safe detergents into the low pressure stream.
3.2 — PRODUCT SPECIFICATIONS
Pressure - (PSI / BAR) .............................. 3100/213 Max
Flow Rate - (GPM / LPM)............................ 2.8/10.6 Max
Water supply temperature - (°F / C°)............. 100/38 Max
Hose length - (Feet / Meters)..................................30/9.1
Chemical Tank(s) - Number per unit...............................1
Chemical Tank - Capacity (Gal) N/A..........................0.75
Nozzles - Number per unit..............................................3
Lance Length (Inches / cm).....................................20/51
Gun.....................................................................Standard
Engine Displacement - (Cubic Inch / cc) ............12.9/212
Spark Plug Type .................................F7TC or equivalent
Spark Plug Gap - (Inches / mm) ....0.028-0.031/0.70-0.80
Fuel Capacity - (Quarts / Liters) ............................ 3.7/3.5
Oil Capacity - (Oz / Liters)...... ... ... .... ... ... ... .... ... ... ... 20/0.6
On/Off Switch ............................................................. Yes
• Hard starting or stalling after starting
• Rough idle
• Misfiring or backfiring under load
• Afterburning (backfiring)
• Black exhaust smoke or high fuel consumption
3.4 — HIGH ALTITUDE OPERATION
The fuel system on this engine may be influenced by
operation at higher altitudes. Proper operation can be
ensured by installing an altitude kit when required. See
the table below to determine when an altitude kit is
required. Operating this engine without the proper altitude kit installed may increase the engine’s emissions
and decrease fuel economy and performance. Kits may
be obtained from any Dealer and should be inst alled by a
qualified individual.
Altitude* Kit Number PSI
0 - 5000 Feet Not Required 3100
5000 - 7000 Feet 0K2016 3100
* Elevation above sea level.
3.3 — EMISSIONS INFORMATION
The U.S. Environmental Protection Agency (and California Air Resource Board for equipment certified to CA
standards) requires that this engine comply with exhaust
and evaporative emission standards. Locate the emissions compliance decal on the engine to determine what
standards the engine meets, and to determine which
emissions warranty applies. The engine is certified to
meet the applicable emission standards on gasoline. It is
important to follow the maintenance specifications in the
Maintenance section to ensure that the engine com plie s
with the applicable emission standards for the duration of
the product’s life. This engine utilizes lean carburetion
settings and other systems to reduce emissions. Tampering with or altering the emission control system may
increase emissions and may be a violation of Federal or
California Law. Act s that co nstitute t amper ing include but
are not limited to:
• Removal or alteration of any part of the intake, fuel, or
exhaust systems
• Altering or defeating the governor linkage or speedadjusting mechanism to cause the engine to operate
outside its design parameters
NOTE:
If the altitude kit has been installed and the engine
will be operated at an altitude where the kit is not
required, the engine should be returned to the original factory configuration. Operating the engine at
lower altitudes with the kit installed may cause the
engine to overheat and result in serious engine damage, and may result in decreased performance and
increased emissions.
If you are aware of any of the following symptoms, have
your engine inspected and repaired by your servicing
dealer:
8 OneWASH™ Power Washer
General Information
3.5 — UNPACKING
1. Remove the parts bag, accessories, and inserts
included with power washer.
2. Open carton completely by cutting each corner from
top to bottom.
3. Ensure you have all included items prior to assembly.
• Main Unit
• Handle Assembly
• High Pressure Hose
• Siphon Hose & Filter
• Spray Gun
• Lance with Quick Connect Fitting
• Oil Bottle
• Hose Hook Wire form
• Parts Bag (which includes the following):
— Operator’s Manual
— Warranty Statement
— Emission Warranty Statement
— CARB Emission Warranty Statement
— Owner’s Registration Card
— Bag containing Color-coded Nozzles
— 4mm Allen wrench
— Screw (Qty 4)
— Tree clips (Qty 4)
— Plastic Gun Holder
— Plastic Lance Holder
4. If you are missing any items from your carton, please
call Generac Customer Service at 1-888-436-3722.
When calling for assistance, please have the model
and serial number from the data tag available.
5. Fill out and send in registration card. Write Model
number , Serial number & date of purchase in the
table located in the “Where to Find Us” section.
OneWASH™ Power Washer 9
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General Information
10 OneWASH™ Power Washer
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Section 4 Set-up
4.1 — ASSEMBLY
Read entire operator’s manual before you attempt to
assemble or if you have any problems with the assembly
of your power washer, please call Generac Customer
Service at 1-888-436-3722. When calling for assistance,
please have the model and serial number from the data
tag available.
1. Install gun hook to handle assembly using the (2)
supplied tree clips. Align holes and push the tree
clips into holes until they sit flush with gun hook
(Figure 4-1).
Figure 4-2. Attach Lance Hook to Unit
3. Place handle assembly (A) onto cradle supports (B).
Allow handle to slide into position. Locate the (4)
screws and Allen wrench. Install the four screws
using supplied Allen wrench as shown in
(Figure 4-3).
Figure 4-1. Attach Gun Hook to Handle
Assembly
2. Install lance hook to unit frame using (2) supplied
tree clips. Align holes and push the tree clips into
holes until they sit flush with gun hook (Figure 4-2).
Figure 4-3. Attach Handle to Unit
OneWASH™ Power Washer 11
Set-up
A
4. Install hose hook (Figure 4-4).
Figure 4-4. Install Hose Hook
5. Insert color–colored nozzles in spaces provided in
front panel (Figure 4-5).
7. Place recoil rope into holder as shown (Figure 4-7).
Figure 4-7. Recoil Rope Hook
8. Attach siphon tube to location A (Figure 4-8).
Figure 4-5. Insert Nozzles
6. Place spray gun/lance extension onto spray gun
holder as shown (Figure 4-6).
Figure 4-6. Gun/Lance
Figure 4-8. Siphon Tube Location
4.2 — ADD ENGINE OIL
1. Place power washer on a flat, level surface.
2. Clean area around oil fill and remove orange oil fill
cap/dipstick.
3. Using oil funnel, slowly pour oil into fill opening. See
“Maintenance” section for oil type recommendation.
NOTE:
On some units there is more than one oil fill location.
In these instances it is only necessary to use one of
the oil fill points.
4. Check periodically until the oil level is between “L”
and “H” on the dipstick (Figure 4-9). Do not overfill.
12 OneWASH™ Power Washer
Set-up
Acceptable Oil
Level Range
Figure 4-9. Dipstick
NOTE:
Any attempt to crank or start the engine before it has
been properly serviced with the recommend oil may
result in engine failure.
5. Replace oil fill cap/dipstick and fully tighten.
• Fill fuel tank outdoors.
• DO NOT overfill tank. Allow space for fuel expansion.
• If fuel spills, wait until it evaporates before starting
engine.
• Keep fuel away from sparks, open flames, pilot lights,
heat, and other ignition sources.
• DO NOT light a cigarette or smoke.
1. Clean area around fuel fill cap, remove cap.
2. Slowly add regular unleaded fuel to fuel tank. Be
careful not to overfill. Fill to bottom of filter screen,
this will allow for fuel expansion (Figure 4-10).
3. Install fuel cap and let any spilled fuel evaporate
before starting engine.
4.3 — FUEL
Fuel must meet these requirements:
• Clean, fresh, unleaded gasoline.
• A minimum of 87 octane/87 AKI (91 RON).
• Gasoline with up to 10% ethanol (gasohol) is acceptable.
NOTE:
Avoid power washer damage. Failure to follow Operator’s Manual for fuel recommendations voids warranty.
• DO NOT use unapproved gasoline such as E85.
• DO NOT mix oil in gasoline.
• DO NOT modify engine to run on alternate fuels.
To protect the fuel system from gelling, mix in a fuel stabilizer when adding fuel. See Storage. All fuel is not the
same. If you experience starting or performanc e pr ob lems after using fuel, switch to a different fuel pro vider or
change brands.
Fuel and its vapors are extremely flammable and explosive. Fire or explosion can
cause severe burns or death.
4.3.1 — WHEN ADDING FUEL
• Turn power washer OFF and let it cool at least two (2)
minutes before removing fuel cap. Loosen cap slowly
to relieve pressure in tank.
Figure 4-10. Adding Fuel
4.4 — CONNECT HOSE AND WATER
UPPLY TO PUMP
S
NOTE:
DO NOT run the pump without the water supply connected and turned on. Damage to equipment resulting from failure to follow this instruction will void
warranty.
NOTE:
Remove and discard the shipping cap from the
pump’s water inlet before attaching hose.
1. Run water through your garden hose for 30 seconds
to clean out any debris.
2. Before connecting garden hose to water inlet, inspect
inlet screen (A) (Figure 4-11). Clean screen if it contains debris or have it replaced if damaged . DO NOT
run power washer if inlet screen is damaged.
OneWASH™ Power Washer 13
Set-up
A
IMPORTANT: DO NOT siphon standing water for the
water supply. Use ONL Y cold water (less than 100°F).
Water supply must be adequate to handle greater than
3.8 gallons per minute and no less than 30 psi.
NOTE:
Using a One Way Valve (vacuum breaker or check
valve) at pump inlet can cause pump or inlet connector damage.
• There MUST be at least ten feet of unrestricted garden
hose between the power washer inlet and any device,
such as a vacuum breaker or check valve.
• Damage to equipment resulting from failure to follow
this instruction will void warranty.
• Always wear safety goggles when using this equipment or in vicinity of equipment in use.
• Before starting the power washer, be sure you are
wearing adequate safety goggles.
• NEVER substitute safety glasses for safety goggles.
4. Connect lance to spray gun (Figure 4-13). T ighten b y
hand.
Figure 4-13. Attach Lance
5. Attach end of high pressure hose to base of spray
gun (Figure 4-14). Tighten by han d.
Figure 4-11. Inspect Inlet Screen
3. Connect the garden hose (not to exceed 50 feet in
length) to the water inlet (Figure 4-12). Tighten by
hand.
Figure 4-12. Connect Garden Hose
Risk of eye injury. Spray can splash back or
propel objects.
Figure 4-14. Connect Hose to Spray Gun
The high pressure stream of water that this
equipment produces can cut through skin and
its underlying tissues, leading to serious
injury and possible amputation.
• NEVER connect high pressure hose to lance.
• Keep high pressure hose connected to pump and
spray gun while system is pressurized.
• Always be certain spray gun, nozzles and accessories
are correctly attached.
14 OneWASH™ Power Washer
Set-up
6. Connect high pressure hose to pump (uncoil hose
before connecting to pump or spray gun)
(Figure 4-15). Tighten by hand.
The hose can be damaged if it comes in contact with a hot engine or muffler.
Figure 4-15. Connect High Pressure Hose
to Pump
• If you get nozzle too close, especially using a high
pressure nozzle (RED), you may damage surface
being cleaned.
The high pressure stream of water that this
equipment produces can cut through skin and
its underlying tissues, leading to serious
injury and possible amputation.
• NEVER exchange nozzles without the trigger lock
being engaged on the spray gun.
• DO NOT twist nozzles while spraying.
NOZZLE PSI GPM
Blast 3100 2.4
Wash 2600 2.8
The OneWash power washer is equipped with a Power
dial to provide optimal cleaning power for each application (Figure 5-4).
1. Pull back collar on quick–connect lance (Figure 4-17)
and install the GREEN wash nozzle (Figure 4-18) for
the following cleaning applications.
7. Turn ON the water, squeeze the trigger to purge the
pump system of air (Figure 4-16) .
Figure 4-16. Squeeze T rigger
4.5 — HOW TO USE NOZZLES
The quick–connect on the nozzle lance allows you to
switch between different nozzles. Nozzles can be
changed while power washer is running once spray gun
trigger is locked in the safety position. The nozzles vary
the pressure and spray pattern.
• For most effective cleaning, keep nozzle from 8 to 24
inches (20 to 61 cm) away from cleaning surface.
Figure 4-17. Nozzles
Figure 4-18. Wash Pressure Nozzle (Green)
OneWASH™ Power Washer 15
2. Turn the Power Dial so that it matches the material
DELICATE
2000 PSI
HEAVY DUTY
3100 PSI
PRESSURE CONTROL
you would like to clean (Figure 4-19).
Car icon - This setting is best for cleaning
cars, boats and RV’s as it delivers the right
balance of power and flow to clean these
types of surfaces effectively.
House Icon - This setting is best for cleaning vinyl and aluminum siding on your
home, as it delivers the right balance of
power and flow to clean these types of surfaces effectively.
Wood Fence Icon - This setting is best for
cleaning wood decks fences and siding on
your home, as it delivers the right balance
of power and flow to clean these types of
surfaces effectively.
Brick Icon - This setting is best for cleaning brick, concrete and masonry materials,
as it delivers the right balance of power and
flow to clean these types of surfaces effectively.
Set-up
Figure 4-20. Blast Pressure Nozzle (Red)
• When applying detergent, use only the black nozzle
(Figure 4-21). Only use power washer safe detergents/
soaps to help break down stubborn dir t and g rime on a
variety of surfaces.
Figure 4-19. Power Dial
Figure 4-21. Detergent Nozzle (Black)
3. To remove persistent stains on concrete or masonry
surfaces, use the red blast nozzle within the stained
area (Figure 4-20).
This tip (Red Nozzle) can damage work surface if it is too close or held in one position for
an extended time.
16 OneWASH™ Power Washer
Set-up
4.5.1 — Cleaning and Applying Detergent
Chemicals can cause bodily injury, and/or
property damage.
• NEVER use caustic liquid with power washer.
• Use ONLY power washer safe detergents/soaps. Fol-
low all manufacturer's instructions.
To apply detergent, follow these steps:
1. Review use of nozzles.
2. Remove chemical tank cap (Figure 4-22).
3. Prepare detergent solution as required by job.
Figure 4-22. Chemical Tank & Cover
4. Insert filter on end of siphoning tube through the hole
in the chemical tank cap (Figure 4-23).
5. Make sure siphoning tube remains fully submerged
into detergent.
NOTE:
Make sure the filter remains fully submerged in
detergent while applying detergent.
NOTE:
Contact with the hot muffler can damage detergent
siphoning tube.
• When inserting the siphon into a detergent solution
bottle, route the tube so as to keep it from inadvertently
contacting the hot muffler.
6. Make sure black detergent nozzle is installed.
NOTE:
Detergent cannot be applied with the high pressure
nozzle (Green or Red). Only use the Black nozzle with
detergent.
7. Confirm set-up instructions have been followed.
NOTE:
You must attach all hoses before you start the
engine.
• Starting the engine without all the hoses connected
and without the water turned ON will damage the
pump.
• Damage to equipment resulting from failure to follow
this instruction will void warranty.
8. Start engine following instructions How to Start Your
Power Washer.
9. Apply detergent to a dry surface, starting at lower
portion of area to be washed and work upward using
long, even, overlapping strokes.
10. Allow detergent to “soak in” for 3-5 minutes before
washing and rinsing. Reapply as needed to prevent
surface from drying. DO NOT allow detergent to dry
on surface being cleaned (prevents streaking).
IMPORTANT: You must flush the detergent siphoning
system after each use by placing the filter into a bucket of
clean water, then run the power washer in low pressure
for 1-2 minutes.
4.5.2 — Power Washer Rinsing
1. Remove black detergent nozzle from lance.
2. Select and install desired high pressure nozzle fol-
lowing instructions How to Use Nozzles.
3. Point spray gun in safe direction and away from pe o-
ple, animals and plants. Squeeze trigger to flush a ny
Figure 4-23. Install Siphoning Tube
OneWASH™ Power Washer 17
remaining chemical from system.
4. Keep spray gun a safe distance from area you plan
to spray.
Kickback from spray gun can cause
you to fall.
• Use only on a level surface.
• Do not use on elevated surface to prevent the risk of a
serious fall.
• Firmly grasp spray gun with both hands when using
high pressure spray to avoid injury when spray gun
kicks back.
5. Apply a high pressure spray to a small area and then
check surface for damage. If no damage is found,
you can assume it is okay to continue rinsing.
6. Start at top of area to be rinsed, working down with
same overlapping strokes as you used for cleaning.
4.5.3 — Cleaning Detergent Siphoning Tube
If you used the detergent siphoning tube, you must flush
it with clean water before stopping the engine.
Set-up
1. Place detergent siphoning tube/filter in a bucket full
of clean water.
2. Remove high pressure nozzle from nozzle extension.
3. Select and install black detergent nozzle following
instructions “How to Use Nozzles”.
4. Flush for 1-2 minutes.
5. Shut off engine following instructions How to Stop
Power Washer and turn off water supply.
6. AL W A YS point spray gun in a safe direction, squeeze
spray gun trigger to release retained high wa te r pres sure. Engage trigger lock when not in use.
IMPORTANT: S pray gun trap s high water pressur e, even
when engine is stopped and water is disconnected.
The high pressure stream of water that this
equipment produces can cut through skin and
its underlying tissues, leading to serious
injury and possible amputation. Spray gun
traps high water pressure, even when engine
is stopped and water is disconnected, which
can cause injury.
• Keep high pressure hose connec ted to pump and
spray gun while system is pressurized.
• ALWAYS point spray gun in safe direction, and
squeeze spray gun trigger to release high pressure,
every time you stop engine. Engage trigger lock when
not in use.
18 OneWASH™ Power Washer
5 Foot Minimum
Section 5 Operation
5.1 — OPERATION
If you have any problems operating your power washer,
please call Generac customer service at
1-888-436-3722.
5.2 — POWER WASHER L OCATION
5.2.1 — Clearances and Air Movement
Running engine gives off carbon monoxide,
an odorless, colorless, poisonous gas.
Breathing carbon monoxide can caus e he ad ache, fatigue, dizziness, vomiting, confusion,
seizures, nausea, fainting or death. For more
information, reference the CO warnings in the
“Safety” section.
Figure 5-1. Building Clearances
Place power washer outdoors in an area that will not
accumulate deadly exhaust gas. NEVER place power
washer where exhaust gas could accumulate and enter
inside or be drawn into a potentially occupied building.
Ensure exhaust gas is kept away from any windows,
doors, ventilation intakes, or other openings that can
allow exhaust gas to collect in a confined area. Prevailing
winds and air currents should be ta ken into consideration
when positioning power washer (Figur e 5-1).
• Operate power washer ONLY outdoors.
• Keep exhaust gas from entering a co nf in e d ar ea
through windows, doors, ventilation intakes, or other
openings.
• NEVER start or run engine indoors, in a vehicle or in
an enclosed area, EVEN if windows and doors are
open.
Exhaust heat/gases can ignite combustibles, structures or damage fuel tank
causing a fire.
• Keep at least 5 ft. (152 cm) clearance on all sides of
power washer including overhead.
5.3 — CHECKLIST BEFORE STARTING
NGINE
E
1. Be sure to read and understand the “Safety” section
and “Operation” section before using power washer.
2. Check that the oil is at the full mark on the dipstick,
and that fuel has been added to the fuel tank.
3. Review the unit’s assembly and ensure fitting are
properly secured and make sure there are no kinks,
cuts, or damage to high pressure hose.
4. Provide a proper water supply at an adequate flow,
clear screens of debris, and confirm that the system
is purged of air.
5. Confirm unit is secure on level ground and surrounding work area is clear.
5.4 — HOW TO START YOUR POWER
ASHER
W
NOTE:
DO NOT run the pump without the water supply connected and turned on. Damage to equipment resulting from failure to follow this instruction will void
warranty.
OneWASH™ Power Washer 19
1. Turn the ON/OFF switch to the “ON” position
DELICATE
2000 PSI
HEAVY DUTY
3100 PSI
ON/OFF SWITCH
DELICATE
2000 PSI
HEAVY DUTY
3100 PSI
PRESSURE CONTROL
DELICATE
2000 PSI
HEAVY DUTY
3100 PSI
CHOKE “ON”
CHOKE “OFF”
STARTER
GRIP
(Figure 5-2).
Figure 5-2. ON/OFF Switch
2. Rotate pressure control knob to the position show n
on “Start” decal (Item #2) (Figure 5-3).
Operation
Figure 5-4. Choke Knob
4. Secure unit from movement when pulling recoil.
5. When starting the engine, grasp starter grip handle
(Figure 5-5) and pull slowly until you feel some resistance. Then pull rapidly to start engine.
Figure 5-3. Power Dial
3. Choke the engine by slowly pulling out on the choke
knob until it stops in the “ON” position (Figure 5-4).
Figure 5-5. Starting the Engine
Hearing Protection Recommended.
6. Return starter grip handle slowly. DO NOT let rope
“snap back” against holder.
NOTE:
For a warm engine, push the choke knob down until
it stops in the “OFF” position (Figure 5-4).
20 OneWASH™ Power Washer
7. When engine starts, slowly push the choke knob in to
the “OFF” position as engine warms. If engine falters,
pull choke knob out to the “ON” position, then push in
to the “OFF” position (Figure 5-6).
Operation
DELICATE
2000 PSI
HEAVY DUTY
3100 PSI
CHOKE “ON”
CHOKE “OFF”
Figure 5-6. Choke Knob
8. After each starting attempt, where engine fails to run,
always point gun in safe direction, and squeeze
spray gun trigger to release high pressure.
9. If engine fails to start after six pulls, push choke knob
in to the “OFF” position, and repeat steps 6 through
10.
Contact with muffler area can result in
serious burns. Exhaust heat/gases can
ignite combustibles, structures or
damage fuel tank causing a fire.
• DO NOT touch hot parts and AVOID hot exhaust
gases.
• Allow equipment to cool before touching.
• Keep at least 5 feet (152 cm) of clearance on all sides
of power washer including overhead.
• It is a violation of California Public Resource Code,
Section 4442, to use or operate the engine on any forest-covered, brush-covered, or grass-covered land
unless the exhaust system is equipped with a spark
arrester , as defined in Section 4442, maintained in
effective working order. Other states or federal jurisdictions may have similar laws.
• Replacement parts must be the same and installed in
the same position as the original parts.
5.5 — AUTOMATIC COOL DOWN SYSTEM
HERMAL RELIEF)
(T
The high pressure stream of water that this
equipment produces can cut through skin and
its underlying tissues, leading to serious
injury and possible amputation. Spray gun
traps high water pressure, even when engine
is stopped and water is disconnected, which
can cause injury.
• DO NOT allow CHILDREN to operate power washer or
play nearby.
• Keep high pressure hose connec ted to pump and
spray gun while system is pressurized.
• NEVER aim spray gun at people, animals or electrical
devices. Serious injury will result.
• DO NOT secure spray gun in open position.
• DO NOT leave spray gun unattended while machine is
running.
• NEVER use a spray gun which does not have a trigger
lock or trigger guard in place and in working order.
• Always be certain spray gun, nozzles and accessories
are correctly attached.
If you run the engine on your power washer for 3-5 min utes without pressing the trigger on the spray gun, circulating water in the pump can reach temperatures above
125°F. The system engages to cool the pump by discharging the warm water onto the ground.
5.6 — HOW TO STOP YOUR POWER
ASHER
W
1. Release spray gun trigger.
2. Turn the engine ON/OFF switch to the “OFF” position
(Figure 5-7).
3. ALWAYS point spray g un in a safe direction, and
squeeze spray gun trigger to release retained high
water pressure. Engage trigger lock when not in use.
4. Turn OFF water supply.
OneWASH™ Power Washer 21
Figure 5-7. ON/OFF Switch
DELICATE
2000 PSI
HEAVY DUTY
3100 PSI
ON/OFF SWITCH
IMPORTANT: S pray gun trap s high water pressur e, even
when engine is stopped and water is disconnected.
The high pressure stream of water that this
equipment produces can cut through skin and
its underlying tissues, leading to serious
injury and possible amputation. Spray gun
traps high water pressure, even when engine
is stopped and water is disconnected, which
can cause injury.
Operation
• Keep high pressure hose connec ted to pump and
spray gun while system is pressurized.
• ALWAYS point spray gun in safe direction, squeeze
spray gun trigger to release high pressure, every time
you stop engine. Engage trigger lock when not in use.
22 OneWASH™ Power Washer
Section 6 Maintenance
6.1 — MAINTENANCE RECOMMENDATIONS
Regular maintenance will improve the performance and
extend the life of the power washer. See any qualified
dealer for service.
The power washer’s warranty does not cover items that
have been subjected to operator abuse o r negligence. To
receive full value from the warranty, the operator must
maintain the power washer as instructed in this manual,
including proper storage as detailed in “Winter Storage”
and “Long Term Storage”.
NOTE:
Should you have questions about replacing components on your power washer, please call
1-888-436-3722 for assistance.
Some adjustments will need to be made periodically to
properly maintain your power washer.
All service and adjustments should be made at least
once each season. Follow the requireme nts in the “Maintenance Schedule” chart.
NOTE:
Once a year you should clean or replace the spark
plug, clean or replace the air filter, and check the
spray gun and nozzle extension assembly for wear. A
new spark plug and clean air filter assure prop er fuelair mixture and help your engine run better and last
longer.
6.2 — MAINTENANCE SCHEDULE
Follow the hourly or calendar intervals, whichever occurs
first. More frequent service is required when operating in
adverse conditions.
First 5 Hours
Change engine oil
Every 8 Hours or Daily
Check/clean water inlet screen*
Check high pressure hose
Check detergent siphoning hose/filter
Check spray gun and assembly for leaks
Clean debris
Check engine oil level
Every 20 Hours or Every Season
Change engine oil**
Every 50 Hours or Every Season
Check/clean air cleaner filter**
Inspect muffler and spark arrester*
Every 100 Hours or Every Season
Service spark plug
* Clean if clogged. Replace if perforated or torn.
** Service more often under dirty or dusty conditions.
OneWASH™ Power Washer 23
Maintenance
6.3 — PUMP OIL
DO NOT attempt any oil maintenance on this pump. The
pump is pre-lubricated and sealed from the factory,
requiring no additional maintenance for the life of the
pump.
6.4 — EMISSIONS CONTROL
Maintenance, replacement, or rep air of the emissions
control devices and systems may be performed by
any non-road engine repair establishment or individual. However, to obtain “no charge” emissions control
service, the work must be performed by a factory authorized dealer. See the Emissions Warranty.
6.5 — POWER DIAL SETTINGS
Tampering, maintenance, adjustment or replacement of
the throttle settings will impact the performance and may
void the warranty of the unit.
6.6 — POWER WASHER MAINTENANCE
6.6.1 — Clean Debris
Daily or before use, clean accumulated debris from
cleaning system. Keep linkage, spring and controls
clean. Keep area around and behind muffler free from
any combustible debris. Inspect cooling air slots and
openings on the power washer. These openings must be
kept clean and unobstructed.
Power washer parts should be kept clean to reduce the
risk of overheating and ignition of accumulated debris.
• Use a damp cloth to wipe exterior surfaces c lea n.
NOTE:
Improper treatment of power washer can damage it
and shorten its life.
• DO NOT insert any objects through cooling slots.
• Use a soft bristle brush to loosen caked on dirt, oil, etc.
• Use a vacuum cleaner to pick up loose dirt and debris.
6.7 — CHECK AND CLEAN INLET SCREEN
Examine the screen on the pump’s water inlet. Clean it if
the screen is clogged or replace it if screen is damaged.
6.8 — CHECK HIGH PRESSURE HOSES
The high pressure hoses can develop leaks from wear,
kinking, or abuse. Inspect the hoses each time before
using them. Check for cuts, leaks, abrasions or bulging of
cover, damage or movement of couplings. If any of these
conditions exist, replace the hose immediately.
The high pressure stream of water that this
equipment produces can cut through skin and
its underlying tissues, leading to serious
injury and possible amputation.
• NEVER repair high pressure hose. Replace it.
• Replacement hose rating MUST meet or exceed maximum pressure rating of unit.
6.9 — CHECK DETERGENT SIPHONING
UBE
T
Examine the filter on the detergent tube and clean if
clogged. The tube should fit tightly on the barbed fitting.
Examine the tube for leaks or tears. Replace the filter or
tube if either is damaged.
6.10 — CHECK SPRAY GUN
Examine the hose connection to the spray gun and make
sure it is secure. Test the trigger by pressing the trigg er , it
“springs back” into place when you release it. Replace
spray gun immediately if it fails to “spring back”.
6.11 — CHEMICAL TANK MAINTENANCE
Periodically you will need to drain and clean the chemical
tank.
Use the following these instructions:
1. Shut off engine and turn off water supply.
2. AL W A YS point spray g un in a safe direction, squeeze
spray gun trigger to release retained high water pressure.
3. Remove chemical fill cap and siphon hose
(Figure 6-1).
4. Obtain a container to drain the excess chemical into.
24 OneWASH™ Power Washer
Maintenance
Figure 6-1. Chemical Cap/Siphon Hose
5. Place container under the chemical tank drain.
(Figure 6-2).
6. Remove drain cap and allow chemical to drain.
7. Insert garden hose into fill neck allow water to flush
out tank.
8. Once tank is clean re install drain cap with gasket, do
not over tighten.
The high pressure stream of water that this
equipment produces can cut through skin and
its underlying tissues, leading to serious
injury and possible amputation. Spray gun
traps high water pressure, even when engine
is stopped and water is disconnected, which
can cause injury.
• Keep high pressure hose connected to pump and
spray gun while system is pressurized.
• ALWAYS point spray gun in safe direction, and
squeeze spray gun trigger to release high pressure
every time you stop engine. Engage trigger lock when
not in use.
3. Remove nozzle from end of nozzle extension.
4. Use a small paper clip to free any foreign material
clogging or restricting nozzle (Figure 6-3).
5. Remove lance from spray gun.
Figure 6-3. Free Foreign Material
Figure 6-2. Chemical Drain Cap
6. Using a garden hose, remove additional debris by
back flushing water through lance (Figure 6-4). Back
flush between 30 to 60 seconds.
6.12 — NOZZLE MAINTENANCE
A pulsing sensation felt while squeezing the spray gun
trigger may be caused by excessive pump pressure. The
principal cause of excessive pump pressure is a nozzle
clogged or restricted with foreign materials, such as dirt,
etc. To correct the problem, immediately clean the nozzle
following these instructions:
1. Shut off engine and turn off water supply.
2. AL W A YS point spray gun in a safe direction, squeeze
spray gun trigger to release retained high water pressure.
OneWASH™ Power Washer 25
7. Reinstall nozzle into lance.
8. Reconnect lance to spray gun.
9. Make sure garden hose is connected to pump water
Figure 6-4. Back Flush Lance
inlet. Check that high pressure hose is connected to
spray gun and pump. Turn on water.
Maintenance
SA E 30 *
10 W- 30 **
5W -3 0
Acceptable Oil
Level Range
10. Start engine following instructions “How to Start Your
Power Washer”.
11. Test power washer by operating with each quick connect nozzle.
6.13 — ENGINE MAINTENANCE
Unintentional sparking can result in fire
or electric shock.
WHEN ADJUSTING OR MAKING REPAIRS TO YOUR
POWER WASHER
• Disconnect the spark plug wire from the sp ark plug and
place the wire where it cannot contact sp ark plug.
WHEN TESTING FOR ENGINE SPARK
• Use approved spark plug tester.
• DO NOT check for spark with spark plug removed.
6.14 — ENGINE OIL RECOMMENDATIONS
We recommend the use of high-quality detergent oils
acceptable if classified for service SF, SG, SH, SJ or
higher. DO NOT use special additives.
Outdoor temperatures determine the proper oil viscosity
for the engine. Use the chart to select the best viscosity
for the outdoor temperature range expected.
SAE 30*
10W-30**
5W-30
6.14.1 — Check Oil Level
Oil level should be checked prior to each use or at least
every 8 hours of operation. Keep oil level maintained.
1. Make sure power washer is on a flat, level surface.
2. Clean area around oil fill and wipe dipstick clean
remove oil fill cap (Figure 6-5).
3. Verify oil is at the proper level on the dipstick.
4. Insert the dipstick into filler neck but do not screw it
in.
5. Replace and tighten oil fill cap.
Figure 6-5. Fill Engine Oil
6.14.2 — Adding Engine Oil
1. Make sure power washer is on a flat, level surface.
2. Check oil level as described in Checking Oil Level.
3. If needed, slowly pour oil into oil fill opening until the
proper level on the dipstick is reached.
4. Insert the dipstick into filler neck but do not screw it
in.
5. If level is low, fill until the oil level is between “L” and
“H” on the dipstick (Figure 6-6).
6. Replace and tighten oil fill cap.
* Below 50°F (10°C) the use of SAE 30 will result in hard start-
ing.
** Above 80°F (27°C) the use of 10W30 may cause increased
oil consumption. Check oil level more frequently.
NOTE:
Synthetic oil meeting ILSAC GF-2, API certification
mark and API service symbol with “SJ/CF ENERGY
CONSERVING” or higher, is an acceptable oil at all
temperatures. Use of synthetic oil do e s no t alte r
required oil change intervals.
26 OneWASH™ Power Washer
Figure 6-6. Dipstick
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