4750-WATT
DUAL FUEL GENERATOR
Instruction Manual
IMPORTANT: Your new tool has been engineered and manufactured to WEN’s highest standards for dependability,
ease of operation, and operator safety. When properly cared for, this product will supply you years of rugged,
trouble-free performance. Pay close attention to the rules for safe operation, warnings, and cautions. If you use
your tool properly and for its intended purpose, you will enjoy years of safe, reliable service.
NEED HELP? CONTACT US!
Have product questions? Need technical support? Please feel free to contact us:
TECHSUPPOR[email protected]1-800-232-1195 (M-F 8AM-5PM CST)
For replacement parts and the most up-to-date instruction manuals, visit WENPRODUCTS.COM
MODEL DF472X
CONTENTS
WELCOME 3
Specifications ................................................................................................... 3
Introduction ..................................................................................................... 4
SAFETY 5
General Safety Rules ........................................................................................ 5
Generator Safety Warnings .............................................................................. 7
BEFORE OPERATING 10
Know Your Generator ..................................................................................... 10
Unpacking & Packing List .............................................................................. 12
Generator Preparation .................................................................................... 13
OPERATION & MAINTENANCE 18
Starting Your Generator ................................................................................. 18
Using Your Generator ..................................................................................... 20
Shutting Off Your Generator ........................................................................... 23
Maintenance ................................................................................................... 24
Transportation & Storage ............................................................................... 30
Troubleshooting Guide ................................................................................... 31
Wiring Diagram .............................................................................................. 32
Exploded View & Parts List ............................................................................ 33
Warranty Statement ....................................................................................... 40
2
To purchase accessories and replacement parts for your tool, visit WENPRODUCTS.COM
Magnetic Oil Dipstick (Model 55201)
Universal Weatherproof Medium Generator Cover (Model 56406)
1800-Watt Generator to RV Adapter Cord (Model PC3012)
50 ft. Heavy-Duty Outdoor Extension Cord (Model PC5012)
100 ft. Heavy-Duty Outdoor Extension Cord (Model PC1123)
3 ft. Generator Extension Cord Splitter (Model PC1405)
Wheel and Handle Kit (Model GNA410)
SPECIFICATIONS
GENERATOR
ENGINE
Model Number DF472
Rated Wattage
Gasoline: 3800 Watts
LPG: 3500 Watts
Surge Wattage
Gasoline: 4750 Watts
LPG: 4350 Watts
Phase Single
Frequency 60 Hz
Rated Voltage AC: 120V/240V, DC: 12V
Rated Amperage AC: 32A/16A, DC: 8A
Product Dimensions 23.2 in. x 17.5 in. x 18.5 in.
Product Net Weight 103.18 Pounds
Engine Type 4-stroke, OHV, Single Cylinder
Engine Displacement 224cc
No-Load Speed 3600 RPM
Fuel Tank Capacity 4 US Gallons (15 L), 87 octane minimum
Oil Capacity 20.3 fl. oz. (0.6 L)
Half-Load Run Time
Gasoline: 11 hours
LPG (with 20 lb tank): 7 hours
Spark Plug Type Torch F7TC/NGK BP7ES
Spark Plug Gap 0.7 - 0.8 mm (0.028 - 0.031 in)
Spark Plug Torque
1/2 - 3/4 turn after gasket contacts base or 15
ft-lbs
Length of LPG Hose 47 inches (1200 mm)
3
INTRODUCTION
Thanks for purchasing the WEN 4750-Watt Dual Fuel Generator. Refer to the illustration below for the location of
the serial number on the specifications label. Record the generator information in the spaces provided below. If as-
sistance for information or service is required, please contact customer service by calling 1-800-232-1195, M-F 8-5
CST; you will be asked to provide the following generator information when calling.
Generator Model Number: DF472
Date of Purchase: _______________________________________________
Purchased From: ________________________________________________
Serial Number: _________________________________________________
TO MAXIMIZE THE LIFESPAN OF YOUR GENERATOR: We recommend running your generator at least once a
month for 20 to 30 minutes. Start the generator according to the instructions and plug a small load in to make
sure the outlet is producing electricity.
SERVICE RECORD
Record the service dates of your generator in the chart below. Please perform maintenance checks and operations
according to the “Maintenance” section of the manual.
Service Record Date Date Date Date Date Date
Change Oil
Change Spark Plug
Clean Fuel Tank
Clean Air Cleaner
Clean Spark Arrestor
Serial Number
4
GENERAL SAFETY RULES
WORK AREA SAFETY
1. Keep work area clean and well lit. Cluttered or dark
areas invite accidents.
2. Do not operate power tools in explosive atmo-
spheres, such as in the presence of flammable liquids,
gases or dust. Power tools create sparks which may ig-
nite the dust or fumes.
3. Keep children and bystanders away while operating
a power tool. Distractions can cause you to lose control.
ELECTRICAL SAFETY
1. Power tool plugs must match the outlet. Never mod-
ify the plug in any way. Do not use any adapter plugs
with earthed (grounded) power tools. Unmodified plugs
and matching outlets will reduce risk of electric shock.
2. Avoid body contact with earthed or grounded surfac-
es such as pipes, radiators, ranges and refrigerators.
There is an increased risk of electric shock if your body
is earthed or grounded.
3. Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of elec-
tric shock.
4. Do not abuse the cord. Never use the cord for car-
rying, pulling or unplugging the power tool. Keep cord
away from heat, oil, sharp edges or moving parts.
Damaged or entangled cords increase the risk of electric
shock.
5. When operating a power tool outdoors, use an ex-
tension cord suitable for outdoor use. Use of a cord
suitable for outdoor use reduces the risk of electric
shock.
6. If operating a power tool in a damp location is un-
avoidable, use a ground fault circuit interrupter (GFCI)
protected supply. Use of a GFCI reduces the risk of elec-
tric shock.
PERSONAL SAFETY
1. Stay alert, watch what you are doing and use com-
mon sense when operating a power tool. Do not use a
power tool while you are tired or under the influence
of drugs, alcohol or medication. A moment of inatten-
tion while operating power tools may result in serious
personal injury.
2. Use personal protective equipment. Always wear
eye protection. Protective equipment such as a respira-
tory mask, non-skid safety shoes and hearing protection
used for appropriate conditions will reduce the risk of
personal injury.
3. Prevent unintentional starting. Ensure the switch is
in the off-position before connecting to power source
and/or battery pack, picking up or carrying the tool.
Carrying power tools with your finger on the switch or
energizing power tools that have the switch on invites
accidents.
4. Remove any adjusting key or wrench before turning
the power tool on. A wrench or a key left attached to a
rotating part of the power tool may result in personal
injury.
5. Do not overreach. Keep proper footing and balance
at all times. This enables better control of the power
tool in unexpected situations.
6. Dress properly. Do not wear loose clothing or jew-
elry. Keep your hair and clothing away from moving
parts. Loose clothes, jewelry or long hair can be caught
in moving parts.
Safety is a combination of common sense, staying alert and knowing how your item works. The term “power tool”
in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
SAVE THESE SAFETY INSTRUCTIONS.
WARNING! Read all safety warnings and all instructions. Failure to follow the warnings and instructions may
result in electric shock, fire and/or serious injury.
5
GENERAL SAFETY RULES
7. If devices are provided for the connection of dust
extraction and collection facilities, ensure these are
connected and properly used. Use of dust collection
can reduce dust-related hazards.
POWER TOOL USE AND CARE
1. Do not force the power tool. Use the correct power
tool for your application. The correct power tool will
do the job better and safer at the rate for which it was
designed.
2. Do not use the power tool if the switch does not turn
it on and off. Any power tool that cannot be controlled
with the switch is dangerous and must be repaired.
3. Disconnect the plug from the power source and/or
the battery pack from the power tool before making
any adjustments, changing accessories, or storing
power tools. Such preventive safety measures reduce
the risk of starting the power tool accidentally.
4. Store idle power tools out of the reach of children
and do not allow persons unfamiliar with the power
tool or these instructions to operate the power tool.
Power tools are dangerous in the hands of untrained us-
ers.
5. Maintain power tools. Check for misalignment or
binding of moving parts, breakage of parts and any
other condition that may affect the power tool’s opera-
tion. If damaged, have the power tool repaired before
use. Many accidents are caused by poorly maintained
power tools.
6. Keep cutting tools sharp and clean. Properly main-
tained cutting tools with sharp cutting edges are less
likely to bind and are easier to control.
7. Use the power tool, accessories and tool bits, etc.
in accordance with these instructions, taking into ac-
count the working conditions and the work to be per-
formed. Use of the power tool for operations different
from those intended could result in a hazardous situa-
tion.
8. Use clamps to secure your workpiece to a stable
surface. Holding a workpiece by hand or using your
body to support it may lead to loss of control.
9. KEEP GUARDS IN PLACE and in working order.
SERVICE
1. Have your power tool serviced by a qualified repair
person using only identical replacement parts. This
will ensure that the safety of the power tool is main-
tained.
CALIFORNIA PROPOSITION 65 WARNING
Some dust created by power sanding, sawing, grinding,
drilling, and other construction activities may contain
chemicals, including lead, known to the State of Califor-
nia to cause cancer, birth defects, or other reproductive
harm. Wash hands after handling. Some examples of
these chemicals are:
• Lead from lead-based paints.
• Crystalline silica from bricks, cement, and other
masonry products.
• Arsenic and chromium from chemically treated
lumber.
Your risk from these exposures varies depending on
how often you do this type of work. To reduce your ex-
posure to these chemicals, work in a well-ventilated area
with approved safety equipment such as dust masks
specially designed to filter out microscopic particles.
Safety is a combination of common sense, staying alert and knowing how your item works. The term “power tool”
in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
SAVE THESE SAFETY INSTRUCTIONS.
WARNING! Read all safety warnings and all instructions. Failure to follow the warnings and instructions may
result in electric shock, fire and/or serious injury.
6
GENERATOR SAFETY WARNINGS
DANGER! CARBON MONOXIDE
Using a generator indoors CAN KILL YOU IN MINUTES. Generator exhaust contains carbon monoxide (CO). This
is a poison gas you cannot see or smell. If you can smell the generator exhaust, you are breathing CO. But even
if you cannot smell the exhaust, you could be breathing CO.
NEVER use a generator inside homes, garages, crawl spaces, or other partially enclosed areas. Deadly levels
of carbon monoxide can build up in these areas. Using a fan or opening windows and doors does NOT supply
enough fresh air. ONLY use a generator outside and far away from windows, doors, and vents. These openings
can pull in generator exhaust.
Even if you use a generator correctly, CO may leak into the home. ALWAYS use a battery-powered or battery-
backup CO alarm in the home. If you start to feel sick, dizzy, or weak after the generator has been running, move
to fresh air RIGHT AWAY. See a doctor. You may have carbon monoxide poisoning.
WARNING! RISK OF EXPLOSION. HIGHLY FLAMMABLE: This generator may emit highly flammable and
explosive gasoline vapors, which can cause severe burns or even death, if ignited. A nearby open flame can lead
to explosion even if not directly in contact with gasoline.
• Do not operate near open flame, heat, or any other ignition source. Do not smoke near the generator.
• Always operate on a firm, level surface.
• Always turn generator off before refueling. Allow generator to cool for at least 2 minutes before removing
fuel cap. Loosen cap slowly to relieve pressure in tank.
• Do not overfill fuel tank. Gasoline may expand during operation. Do not fill to the top of the tank. Allow for
expansion. Always check for spilled fuel before operating.
• If fuel spills, move the generator at least 30 feet away from the spill and wipe clean any spilled fuel before
starting the engine.
• Empty fuel tank before storing or transporting the generator.
WARNING! If this generator is used as a supply for a building’s wiring system, the generator must be in-
stalled by a qualified electrician and connected to a transfer switch as a separately derived system in accordance
with all applicable laws and electrical codes and the National Electrical Code, NFPA 70. The generator shall be
connected to a transfer switch that switches all conductors excluding the equipment grounding conductor. The
frame of the generator shall be connected to an approved grounding electrode.
CALIFORNIA PROPOSITION 65 WARNING: This product contains chemicals and produces exhaust known
to the State of California to cause cancer, birth defects and other reproductive harm. For more information, visit
www.P65Warnings.ca.gov
7
OPERATING ENVIRONMENT
1. Using a generator indoors can kill you in minutes.
Only use a generator outside and far away from win-
dows, doors and vents.
2. Do not smoke near the generator.
3. Do not operate near open flame, heat, or flammable
materials. This generator may emit highly flammable
and explosive gasoline vapors, which can cause severe
burns or even death if ignited. A nearby open flame can
lead to an explosion even if it isn’t directly in contact with
gasoline.
4. Do not expose the generator to rainy or wet con-
ditions; doing so significantly increases the risk of
electrical shock. Never handle the generator, electronic
devices, or any cord while standing in water, while bare-
foot, or when hands or feet are wet.
5. Always operate the generator on a dry, firm, level
surface.
6. The generator should have at least 5 feet of clear-
ance from buildings or other equipment during opera-
tion.
7. Do not allow children or non-qualified persons to
operate the generator.
GENERATOR PREPARATION
1. Always ground the generator before using it to maxi-
mize safety (see “Ground the Generator” section).
2. Do not overfill fuel tank, as gasoline may expand
during operation. Do not fill to the very top of the tank.
Leave room for gasoline expansion. Always check for
spilled fuel before operating.
3. If any part of the generator, electrical device or pow-
er cord is broken, damaged, or defective, make sure
it is repaired or replaced before operation. Service
should only be performed by a qualified technician. Do
not use receptacles or cords that show signs of damage,
such as broken or cracked insulation.
4. Use a ground fault circuit interrupter (GFCI) in highly
conductive areas such as metal decking or steel work.
Extension cords with in-line GFCIs are recommended for
these operations to maximize safety.
5. If connecting the generator to a building’s electri-
cal system for standby power, you MUST consult a
qualified electrician and install a transfer switch. Such
connections must comply with local electrical laws and
codes. Failure to comply can create a back-feed, which
may result in serious injury or death to utility workers.
6. Never modify the generator in any way. Modifying
or using the machine for any other purpose for which it
is not designed may result in serious injuries, machine
damage and voiding of the warranty.
GENERATOR OPERATION
1. Only use the generator for its intended purposes.
Modifying or using the generator for operations for
which it was not designed may cause hazards and per-
sonal injury.
2. Do not touch bare wires or receptacles (outlets).
3. Do not exceed the wattage capacity of the generator
by plugging in more electrical devices than the unit
can handle. This could damage the generator and/or
connected electrical devices. Check the operating volt-
age and frequency requirements of all electrical devices
prior to plugging them into the generator.
Generator safety warnings continue on the next page.
WARNING! Do not let comfort or familiarity with the product replace strict adherence to product safety rules.
Failure to follow the safety instructions may result in serious personal injury.
GENERATOR SAFETY WARNINGS
8
GENERATOR SAFETY WARNINGS
WARNING! Do not let comfort or familiarity with the product replace strict adherence to product safety rules.
Failure to follow the safety instructions may result in serious personal injury.
4. Allow generator to run for several minutes before
connecting electrical devices. Do not start or stop en-
gine with electrical devices plugged in to the receptacles.
Failure to do so could damage the generator and/or con-
nected electrical devices.
5. Do not turn on electrical devices until after they are
connected to the generator.
6. Generators vibrate in normal use. During and after
the use of the generator, inspect both the generator as
well as extension and power supply cords for damage
resulting from vibration.
7. Do not touch hot parts. This generator produces heat
when running. Temperatures near exhaust can exceed
150ºF (65ºC). Allow generator to cool down after use be-
fore touching engine or areas of the generator that be-
come hot during use.
8. Turn off all connected electrical devices before stop-
ping the generator.
9. Always turn generator off before refueling.
Allow generator to cool for at least 2 minutes before re-
moving fuel cap. Loosen cap slowly to relieve pressure
in tank.
10. Turn the engine switch to “STOP” position when
the engine is not running.
11. Empty fuel tank before storing or transporting the
generator. Do not store generator or gasoline near fur-
naces, water heaters, or any other appliances that pro-
duce heat or have automatic ignitions. Store the genera-
tor and fuel away from sparks, open flames, pilot lights,
heat and other sources of ignition.
12. Always wash hands after handling generator.
CAUTION: Misuse of this generator can damage it or
shorten its lifespan.
TO MAXIMIZE THE LIFESPAN OF YOUR GENERATOR: We recommend running your generator at least once a
month for 20 to 30 minutes. Start the generator according to the instructions and plug a small load in to make
sure the outlet is producing electricity. If you do not run it often, it will greatly shorten the generator’s lifespan
and void the warranty.
9
1. Pressure Relief Valve
Helps prevent pressure buildup in the fuel tank.
2. Fuel Tank
3. Choke Lever
Adjusts the amount of air let into the engine during
startup.
4. Fuel Valve
Allows fuel to enter engine from the fuel tank.
5. Air Filter
A case with a sponge-like element that filters the air en-
tering the engine.
6. Recoil Starter
Pull cord for manually starting the engine.
7. 224cc OHV Engine
8. Fuel Tank Cap
Access to the fuel tank for adding gasoline.
9. Fuel Gauge
Indicates amount of fuel inside the fuel tank. E indicates
Empty, F indicates Full.
10. Control Panel
Refer to the next page for descriptions.
11. Oil Fill & Dipstick
For filling and checking oil.
12. LPG Hose Connector
Connects to LPG hose and LPG cylinder.
1. Pressure Relief Valve
KNOW YOUR GENERATOR
TOOL PURPOSE
Generators provide you with power when and where you need it most. Refer to the following diagrams to become
familiarized with all the parts and controls of your Generator. The components will be referred to later in the manual
for assembly and operation instructions.
GENERATOR
4. Fuel Valve
5. Air Filter
6. Recoil Starter
3. Choke Lever
2. Fuel Tank
7. Engine
10
11. Oil Fill & Dipstick
10. Control Panel
12. LPG Hose Connector
8. Fuel Tank Cap
9. Fuel Gauge
KNOW YOUR GENERATOR
CONTROL PANEL
1 2
7
8
1. Fuel Selector Switch
Turn the dial to easily switch between gasoline or LPG be-
fore operation.
2. Engine Switch
Start and shut down the engine.
3. DC 12V Receptacle
Cigarette lighter style receptacle, 12V DC, 8A.
4. NEMA 5-20R GFCI Duplex Receptacle
Connect electrical devices that run on 120V, 60 Hz, single
phase, AC current.
5. AC 20A Circuit Breaker
Thermal protector that protects the 5-20R receptacle from
overload.
6. Voltage Selector
Sets the generator’s output voltage to 120V or 240V.
• 120V (left): 5-20R outlet (4) is active. L14-30R outlet
(14) puts out 120V.
• 120V/240V (right): 5-20R outlet (4) is inactive. L14-30R
outlet (14) puts out 240V.
7. AC 120/240V 30A NEMA L14-30R Receptacle
Connect electrical devices that run on 120V/240V, 60
Hz, single phase, AC current.
8. Main Circuit Breakers
Push the button to reset the circuit.
9. Grounding Nut
Connection point for grounding the generator to the
earth. See p. 19 for more information.
10. DC Circuit Breaker
Thermal protector that protects the DC circuit from
overload.
3
6
10
4 5
9
11
12
No. Description Qty.
1 Generator 1
2 First Stage Regulator 1
UNPACKING
With the help of a friend or trustworthy foe, such as one of your in-laws, carefully remove the generator from the
packaging and place it on a sturdy, flat surface. Make sure to take out all contents and accessories. Do not discard
the packaging until everything is removed. Check the packing list below to make sure you have all of the parts and
accessories. If any part is missing or broken, please contact customer service at 1-800-232-1195 (M-F 8-5 CST),
or email [email protected].
UNPACKING & PACKING LIST
IMPORTANT: Two red shipping brackets have been added to
the bottom of your generator to protect the generator during
shipping. Please make sure to remove BOTH shipping brackets
before operation. Make sure there is no gasoline or oil in the
generator, and carefully tip the generator on its end for easier
access to the brackets.
PACKING LIST
No. Description Qty.
3 Spark Plug Wrench 1
4 Oil Bottle 1
Fig. 1
• 30W Engine Oil
Temperatures above 40°F
• 10W-30 Engine Oil
Temperatures between 0°F - 40°F
• Synthetic 5W-30 Engine Oil
All temperature ranges
ENGINE OIL RECOMMENDATIONS
Select good quality detergent oil bearing the American Petroleum Institute (API) service classifications
SJ, SL, or SM (synthetic oils may be used). Select the SAE viscosity grade of oil that matches the ex-
pected operating temperature.
°F
°C
-20 0 20 32 40 60 80 100
40200
-20
-10
10
-30 30
30W
10W-30
Synthetic 5W-30
GENERATOR PREPARATION
The following section describes the necessary steps to prepare the generator for use. If you are unsure about how to
perform any of the steps please call 1-800-232-1195 (M-F 8-5 CST) for customer service. Failure to perform these
steps properly can damage the generator or shorten its life.
STEP 1 - ADD/CHECK OIL
The generator is shipped without oil. User must add the proper amount of oil before operating the generator for the
first time. The oil capacity of the engine’s crankcase is 20.3 fl. oz. (0.6 L).
CAUTION! Keep the generator level. Tilting the generator
to assist in filling will cause oil to flow into the wrong
areas of the engine and cause damage.
TO ADD OIL:
1. Place the generator on a level surface. Make sure the en-
gine is OFF before adding or checking oil.
2. Unscrew the oil dipstick (Fig. 3) from the engine.
3. Using an oil funnel or appropriate dispenser, slowly add
oil into the oil fill, being careful not to overfill the unit. Fill the
crankcase to the upper fill line so you can visually see the oil
coming halfway up the oil fill threads. See Fig. 4.
4. Reinstall the oil dipstick and firmly tighten it. Wipe clean
any spilled oil.
NOTE: Extend the lifespan of your generator by catching the
loose metal filaments that naturally build up inside the crank
case with the WEN Magnetic Dipstick (Model 55201), avail-
able for purchase at wenproducts.com.
Upper Fill Line
Lower Fill Line
Dipstick
Fig. 2
Fig. 3
Fig. 4
13
Lower Limit
Upper Limit
TO CHECK OIL LEVEL (before every subsequent start):
1. Place the generator on a level surface. Make sure the
engine is OFF before adding or checking oil.
2. Remove and wipe the dipstick with a clean rag.
3. Insert the dipstick into the oil fill without screwing it in.
Remove the dipstick to check the oil mark.
4. If the oil mark covers less than one half of the dipstick,
slowly add oil until the oil mark reaches the top of the dip-
stick (or when you can see the oil coming halfway up the
oil fill threads). See Fig. 5.
WARNING: RISK OF EXPLOSION. HIGHLY FLAMMABLE: This generator may emit highly flammable and
explosive gasoline vapors, which can cause severe burns or even death, if ignited. A nearby open flame can lead
to explosion even if not directly in contact with gasoline.
• Do not operate near open flame, heat, or any other ignition source. Do not smoke near the generator.
• Always operate on a firm, level surface.
• Always turn generator off before refueling. Allow generator to cool for at least 2 minutes before removing
fuel cap. Loosen cap slowly to relieve pressure in tank.
• Do not overfill fuel tank. Gasoline may expand during operation. Do not fill to the top of the tank. Allow for
expansion. Always check for spilled fuel before operating.
• If fuel spills, move the generator at least 30 feet away from the spill and wipe clean any spilled fuel before
starting the engine.
• Empty fuel tank before storing or transporting the generator.
ONLY use fresh (within 30 days from purchase), lead-free
gasoline with a minimum of 87 octane rating. The genera-
tor performs best with ethanol-free gasoline. DO NOT use
gasoline with over 10% ethanol.
The capacity of the fuel tank is 4 US gallons (15 L). Do not
mix oil with gasoline.
Follow the instructions on the next page to add gasoline.
IMPORTANT:
• Avoid getting dirt or water into the fuel tank.
• Keep gasoline away from sparks, open flames,
pilot lights, heat, and other sources of ignition.
• Gasoline can age in the tank and make starting
difficult. Never store the generator for more
than 2 months with fuel in the tank.
• Never use an oil/gasoline mixture.
• Never use old gasoline.
OIL LEVEL SHUTDOWN
To protect the unit from damage, the generator is equipped with a low-oil-pressure shutoff that will automatically
shut down the engine when the oil level is too low. The oil level of the engine should be checked before each start
to ensure that the engine crankcase contains sufficient lubricant.
STEP 2 - ADD/CHECK FUEL
FUEL OPTION A: GASOLINE
GENERATOR PREPARATION
Fig. 5
14
TO ADD GASOLINE:
1. Place the generator on a level surface. Make sure the
engine is OFF before adding or checking the fuel.
2. Unscrew the fuel cap (Fig. 6) and set it aside. The fuel
cap may be tight and hard to unscrew.
3. Slowly add unleaded gasoline to the fuel tank. Be careful
not to overfill. Reinstall fuel cap and wipe clean any spilled
gasoline with a dry cloth.
NOTE: Do not fill the fuel tank to the very top. If you do
so, gasoline will expand and spill during use, even with
the fuel cap in place.
TO CHECK GAS LEVEL (before every subsequent start):
1. Before starting the generator, check the fuel gauge (Fig. 6) to see if there is sufficient fuel inside the tank:
• E = Empty
• F = Full
2. If the tank is empty, add gasoline to the fuel tank. See above section, "To Add Gasoline".
GENERATOR PREPARATION
Fig. 6
Fuel Cap
Fuel Gauge
WARNING! If using gasoline, the LPG tank must be shut OFF. If using LPG, the fuel valve on the generator
must be turned to the OFF position.
FUEL OPTION B: LIQUID PETROLEUM GAS (LPG)
DANGER! Explosion and fire. LP vapors are extremely flammable and explosive. Do not use or store LP
cylinder in a building, garage or enclosed area. Failure to do so will result in death or serious injury.
WARNING! Explosion and fire. The cylinder valve should be turned OFF (closed) when generator is not in
use. Failure to do so could result in death or serious injury.
• Always keep the LPG cylinder in an upright position.
• When transporting and storing, keep cylinder secured in an upright position with cylinder valve turned off. Keep
cylinders ventilated and away from heat when in a vehicle.
• Liquid Petroleum Gas (LPG) is highly flammable and explosive. Flammable gas under pressure can cause a fire
or explosion if ignited.
• In any petroleum gas fire, flames should not be extinguished unless the fuel supply valve is turned OFF. If a fire
is extinguished and a supply of fuel is not turned OFF, an explosion hazard could be created.
• RISK OF BURNS. Contact with liquid contents of cylinder will cause freeze burns to the skin. If liquid contents
contacts skin or eyes, seek immediate medical attention.
• When exchanging LPG cylinders, be sure the cylinder valve is of the same type.
15
GENERATOR PREPARATION
FUEL OPTION B: LIQUID PETROLEUM GAS (LPG) (CONT.)
NOTE: LPG regulator inlet pressure is approximately 30 PSI at 0 °F, and 218 PSI at 100 °F.
• You can use LPG tanks with Type 1, right hand Acme threads with this generator. Verify that the qualification date
on tank has not expired. Do not use rusted or damaged cylinders.
• All new cylinders must be purged of air and moisture prior to filling. Used cylinders that have not been plugged or
kept closed must also be purged.
• The purging process should be done by the propane gas supplier. (Cylinders from an exchange supplier should
have been purged and properly filled by supplier).
To connect your generator to an LPG cylinder:
1. Take off the safety caps from the cylinder valve, generator-mounted
regulator, and regulator connecting hose ends.
2. With the LPG tank closed, attach the first-stage regulator to the valve.
Turn the regulator’s plastic coupling right (clockwise) to tighten the as-
sembly onto the LPG tank (Fig. 7).
3. Connect the other end of the hose to the generator’s onboard regula-
tor with a 3/4 in. (19mm) wrench (not supplied) (Fig. 8).
4. Turn the LPG tank valve ON (Fig. 9) and check for leaks by spraying
soapy water to check the connections. If bubbles appear, become larger
in size, or increase in number, a leak exists. This must be corrected
before using the generator. Contact your local Independent Authorized
Service Dealer (IASD) for assistance.
NOTE: You can use Teflon (or other tape) to help seal the connection
between the regulator hose and the generator.
Fig. 7
Fig. 8
Fig. 9
CAUTION! Always position the LPG cylinder so the connection
between the valve and regulator won’t cause sharp bends or kinks in
hose.
WARNING! Risk of burns. Contact with liquid contents of cylinder
will cause freeze burns to the skin. If liquid contents contacts skin or
eyes, seek immediate medical attention.
WARNING! When transporting and storing, keep cylinder
secured in an upright position with cylinder valve turned off. Keep
cylinders ventilated and away from heat when in a vehicle.
16
After completing the above preparation, the generator is ready to be started.
GENERATOR PREPARATION
STEP 3 - GROUND THE GENERATOR
To reduce the risk of electric shock and to maximize safety,
the generator should be properly grounded.
Ground the generator by tightening the grounding nut on
the front control panel (Fig. 10) against a grounding wire.
A generally acceptable grounding wire is a No. 12 AWG
(American Wire Gauge) stranded copper wire.
This grounding wire should be connected at the other end
to a copper, brass, or steel-grounding rod that is driven
into the earth. Wire and grounding rods are not included
with the generator.
Fig. 10
Grounding Nut
NOTE: Grounding codes can vary by location. Contact a local electrician to check the area codes.
WARNING! Failure to properly ground the generator increases your risk of electric shock.
HIGH ALTITUDE OPERATION ABOVE 2000 FEET
The fuel system on this generator may be affected by operation at high altitudes. Proper operation can be ensured by
installing an altitude kit at altitudes higher than 2000 feet above sea level. At elevations above 7000 feet, the engine
may experience a decrease in performance, even with the proper altitude kit. Operating this generator without said
kit may increase the engine’s emissions and decrease both fuel economy and performance.
This kit should be installed by a qualified mechanic. You can order the kit at wenproducts.com by searching part
number DF472-HA27. Refer to the instructions included with your altitude kit for more information about installa-
tion.
WARNING! To prevent serious injury from fire, follow the kit installation procedures in a well-ventilated
area away from ignition sources. If the engine is hot from use, shut the engine off and wait for it to cool before
proceeding. Do not smoke near the generator. Warranty will be void if adjustments are not made for high altitude
use.
CAUTION: Engines with the high-altitude kit installed operated at lower altitudes could cause severe engine dam-
age and affect emissions compliance. Be sure to uninstall the high altitude kit when operating at altitudes below
2000 feet.
17
STARTING YOUR GENERATOR
CAUTION! Disconnect all electrical loads from the generator before attempting to start it.
Before starting the generator, make sure you have read and performed the steps in the “Generator Preparation” sec-
tion of this manual. If you are unsure about how to perform any of the steps in this manual please call
1-800-232-1195 (M-F 8-5 CST) for customer service.
To maximize safety, ALWAYS ground the generator before using it. Refer to "Step 3 - Ground The Generator."
Use a ground fault circuit interrupter (GFCI) in highly conductive areas such as metal decking or steel work. GFCIs
are available in-line with some extension cords.
DANGER: CARBON MONOXIDE
Using a generator indoors CAN KILL YOU IN MINUTES. Generator exhaust contains carbon monoxide (CO). This
is a poison gas you cannot see or smell. If you can smell the generator exhaust, you are breathing CO. But even
if you cannot smell the exhaust, you could be breathing CO.
NEVER use a generator inside homes, garages, crawl spaces, or other partially enclosed areas. Deadly levels
of carbon monoxide can build up in these areas. Using a fan or opening windows and doors does NOT supply
enough fresh air. ONLY use a generator outside and far away from windows, doors, and vents. These openings
can pull in generator exhaust.
Even if you use a generator correctly, CO may leak into the home. ALWAYS use a battery-powered or battery-
backup CO alarm in the home. If you start to feel sick, dizzy, or weak after the generator has been running, move
to fresh air RIGHT AWAY. See a doctor. You may have carbon monoxide poisoning.
WARNING: The exhaust from this product contains chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.
WARNING: Do not operate generator near open flame or flammable materials This generator may emit
highly flammable and explosive gasoline vapors, which can cause severe burns or even death if ignited. A
nearby open flame can lead to explosion even if it isn’t directly in contact with gasoline. Do not smoke near the
generator.
WARNING: This generator produces powerful voltage, which can result in electrocution.
WARNING: Do not use in rainy or wet conditions. Do not touch bare wires or receptacles (outlets). Do not
allow children or non-qualified persons to operate.
WARNING: Generator should only be connected to electrical devices, either directly or with an extension
cord. NEVER connect to a building electrical system unless a qualified electrician has connected the generator to
a transfer switch as a separately derived system. Such connections must comply with local electrical laws and
codes. Failure to comply can create a back-feed, which may result in serious injury or death to utility workers.
Follow the instructions on the next page to start your generator.
18
BEFORE STARTING THE GENERATOR
1. Verify that the generator is outside on a dry, level sur-
face. Allow at least two feet of clearance on all sides of the
generator.
2. To maximize safety, check that the generator is properly
grounded (see “Ground the Generator”).
3. Check there is sufficient level of oil in the crankcase. Add
oil if necessary (see “Add/check Oil”).
4. Verify the fuel selection dial is turned to the desired fuel.
Turn the dial up to the 12 o’clock position for gasoline and
down to the 6 o’clock position for LPG. Check that there is
adequate supply of the selected fuel.
5. Make sure all electrical devices are unplugged from the
generator during ignition. Otherwise it will be difficult for
the engine to start.
7. Allow the engine to run for several minutes before attempting to connect any electrical devices. This allows the
generator to stabilize its speed and temperature. Follow the instructions in the next section for properly connecting
your electrical devices.
NOTE: In case you have had repeated failed attempts to start the engine, please consult the troubleshooting guide
before attempting to start the generator. If problems persist please call 1-(800) 232-1195, M-F 8-5 CST.
a. To start the engine with gasoline:
3. Flip the engine switch to the ON position.
4. Move the choke lever to the OPEN/RUN position.
5. Pull the recoil starter to start the engine.
b. To start the engine with LPG:
3. Flip the engine switch to the ON position.
4. Pull the recoil starter 1-3 times to prime the engine.
Never allow the cord to snap back. NOTE: This is only
necessary when using LPG to start the engine.
5. Move the choke lever to the OPEN/RUN position.
6. Pulll the recoil starter to start the engine.
STARTING YOUR GENERATOR
WARNING! The LPG cylinder valve must be shut
OFF when using gasoline. The generator’s fuel valve
must be shut OFF when using LPG.
Fig. 11
Fig. 12
STARTING THE GENERATOR
1. To use gasoline, turn the fuel valve to the ON position (Fig. 11). To use LPG, make sure all of the LPG connectors
and hoses are well connected and sealed. Close the fuel valve, then open the LPG tank valve.
2. Move the choke lever (Fig. 12 - 1) to the CLOSE/START position.
1
19
Generator
Wattage
Capacity
Generator Running (Rated) Watts Generator Starting (Surge) Watts
Gasoline: 3800W Gasoline: 4750W
LPG: 3500W LPG: 4350W
What this means:
The generator can produce a maximum of
3800W/3500W on a continuous basis to sup-
ply ongoing power to your electronic devices.
NOTE: Also check the rated amperage for
each outlet and make sure not to overload
the individual outlets.
What this means:
Some devices such as box fans require short
bursts of extra power in addition to the rated
wattage listed by the device to start their
motors.
The generator can produce a maximum
wattage of 4750W/4350W for a short period
of time (seconds) to cover the extra starting
power required by your electronic devices.
Electronic
Device Wattage
Calculation
Find the wattage information of each device you plan to connect. The information should be
listed on the device or in its instruction manual, or you may refer to Fig. 11.
The wattage can be calculated using this equation:
Watts = Volts x Amperes
To calculate the total running watts of your
devices:
+ Add up the running wattages of all the
device(s) you plan to connect
= The total running wattage
This wattage should NOT exceed the running
wattage of 3800W/3500W.
It is recommended to maintain a load at or
below 3420W/3150W (90% of the rated
output) to ensure steady voltage output and
to prolong the generator’s lifespan.
To calculate the total starting watts of your
devices:
+ Add up the total running wattage of all the
device(s) you plan to connect
+ Add the single highest ADDITIONAL start-
ing wattage out of the device(s) you plan to
connect
= The total surge (starting) wattage
This wattage should NOT exceed the starting
wattage of 4750W/4350W.
If any of either of the total calculated running watts or starting watts is higher than the
capacity of your generator, adjust the load until both wattage requirements are met. Other-
wise you will overload the generator, and cause damage to the engine and your electrical
device(s).
CALCULATING THE WATTAGE OF YOUR DEVICE(S)
Connect electrical devices running on AC current according to their wattage requirements. Calculate the total run-
ning wattage and starting wattage of the device(s) you wish to connect, and MAKE SURE that they are within the
capacity of your generator and the capacity of each individual outlet.
Table 1 - How to Calculate Wattages
USING YOUR GENERATOR
20
CALCULATING THE WATTAGE OF YOUR DEVICE(S) - CONTINUED
The chart below serves as a reference for the estimated wattage requirements of common electrical devices. How-
ever, do not solely rely on this chart - all electronics and appliances are built differently. Always check the wattage
listed on the electrical device before consulting this chart.
Tool or Appliance Rated (Running) Watts Surge (Starting) Watts
Hot Plate 2500 0
Saw - Radial Arm 2000 2000
Electric Stove (Each Element) 1500-2800 0
Saw - Circular 1500 1500
Air Compressor (1 HP) 1500 3000
Window Air Conditioner 1200 1800
Saw - Miter 1200 1200
Microwave 1000 0
Well Water Pump 1000 1000
Sump Pump 800 1200
Refrigerator Freezer 800 1200
Furnace Blower 800 1300
Computer 800 0
Electric Drill 600 900
Television 500 0
Deep Freezer 500 500
Garage Door Opener 480 0
Stereo 400 0
Box Fan 300 600
Clock Radio 300 0
Security System 180 0
DVD Player / VCR 100 0
Common Light Bulb 75 0
Table 2 - Estimated Wattages of Common Electrical Appliances
NOTE: Become familiar with the functions and capacity of each component on the control panel before con-
necting electrical devices. See page 11 for more information about the components of the control panel. Do not
overload generator or individual panel receptacles. Do not connect 50Hz or 3-phase loads to the generator.
USING YOUR GENERATOR
21
Follow the steps below to properly connect your device(s) to the generator:
1. Before connecting electrical devices, allow the generator to run for a few minutes to stabilize the speed and volt-
age output.
2. Select the device with the highest wattage, and make sure it is turned off. Plug the device into the matching gen-
erator outlet and then turn the device on. Allow the engine to stabilize.
3. Repeat step 2 to plug in each additional device. Do not attempt to plug in or start multiple devices at the same
time.
CONNECTING ELECTRICAL DEVICES
CAUTION: Become familiar with the functions and capacity of each component on the control panel (page 11)
before connecting electrical devices. Do not overload generator or individual panel receptacles. Do not connect
50Hz or 3-phase loads to the generator.
IN CASE OF OVERLOAD
If your generator becomes overloaded from too much drawn wattage, the push-to-reset circuit breaker(s) on your
control panel will activate and cut off the output. When an overload occurs, reduce the load by turning off and
unplugging your electronic device(s), then press the activated circuit breaker to reset your generator. If the circuit
breaker does not reset, wait several minutes and try again. If no power is produced after resetting, restart your
generator.
SOME NOTES ABOUT POWER CORDS
Long or thin extension cords can drain the power provided to your electrical devices. Refer to the following chart in
determining the necessary gauge extension cord for each of your devices. Round up to the higher amperage in the
chart to maximize safety.
USING YOUR GENERATOR
Table 3 - Power Cord Requirement Guide*NR = Not Recommended
Device Requirements Max. Cord Length (ft) by Wire Gauge
Amps Watts
(120V)
Watts (240V) #8 wire #10 wire #12 wire #14 wire #16 wire
2.5 300 600 NR NR NR 375 250
5 600 1200 NR NR 300 200 125
7.5 900 1800 NR 350 200 125 100
10 1200 2400 NR 250 150 100 50
15 1800 3600 NR 150 100 65 NR
20 2400 4800 175 125 75 50 NR
25 3000 6000 150 100 60 NR NR
30 3600 7200 125 65 NR NR NR
40 4800 9600 90 NR NR NR NR
WARNING! Generator should only be connected to electrical devices, either directly or with an extension
cord. NEVER CONNECT TO A BUILDING ELECTRICAL SYSTEM unless a qualified electrician has connected the
generator to a transfer switch as a separately derived system. Such connections must comply with local electri-
cal laws and codes. Failure to comply can create a back-feed, which may result in serious injury or death.
22
CHANGING FUELS
1. Before changing the fuel source, make sure the generator is turned off or running under half-load. Do not change
fuel when generator is over half-load.
2. If switching from LPG to gasoline, turn off the LPG tank valve and disconnect LPG fuel tank from generator. Then
turn ON the fuel valve.
If switching from gasoline to LPG, turn off the fuel valve. Then follow the LPG connecting procedure in section
“FUEL OPTION B: Liquid petroleum gas (LPG)”.
3. Check the fuel level of the selected fuel and make sure there is an adequate amount.
4. Turn the fuel selection dial to the desired fuel; turn the dial up to the 12 o’clock position for gasoline and down
to the 6 o’clock position for LPG.
TO STOP THE GENERATOR
1. Turn off all electrical devices prior to unplugging them from the generator. Unplugging running devices can cause
damage to the generator. Never start or stop the generator with electrical devices plugged in or turned on.
2. Let engine run at no-load for several minutes to stabilize internal temperatures of engine and generator.
CAUTION: Allowing gasoline to sit in the fuel tank for long periods of time can make it difficult to start the gen-
erator in the future. Never store the generator for extended periods of time (over 2 months) with fuel in the fuel
tank. Refer to “Storing the Generator”.
3a. If using LPG, make sure the fuel valve is off, turn
the fuel selection dial to gasoline position (12 o’clock)
and flip the engine switch to the OFF position. This is
the final step.
3b. If using gasoline, turn the fuel valve to the OFF
(horizontal) position. Let the generator run until the
fuel is used up. Continue on to step 4.
4. Flip the engine switch to the OFF position.
5. Drain the carburetor (See “Draining the Carbure-
tor”).
IMPORTANT: Always ensure that the fuel valve
and the engine switch are in the OFF position
when the generator is not in use.
USING YOUR GENERATOR
SHUTTING OFF YOUR GENERATOR
WARNING! Allow the generator to cool down before touching areas that become hot during use.
23
WARNING! Never perform maintenance operations while the generator is running. Before maintaining or
servicing the generator, turn OFF the generator, disconnect all devices and allow the generator to cool down.
NOTE: Failure to properly maintain the generator will void the warranty.
RECOMMENDED MAINTENANCE SCHEDULE
Proper routine maintenance of the generator will help prolong the life of the machine. Please perform maintenance
checks and operations according to the maintenance schedule below, Table 4. If there are any questions about the
maintenance procedures listed in this manual, please contact customer service at 1-800-232-1195 (M-F 8-5 CST),
or email [email protected].
IMPORTANT GENERATOR MAINTENANCE TIPS:
• Drain your carburetor after each use and before storage to prevent it from clogging.
• Do not store the generator with fuel inside the tank for more than 2 months - the fuel will go bad.
• Run the generator for 20 to 30 minutes every month to maximize its lifespan.
Recommended
Maintenance Schedule
Every 8
Hours or
Daily
Every 25
Hours
Every 3
Months or
50 Hours
Every 6
Months or
100 Hours
Before
Storage
As
Necessary
Engine Oil
Check Level X
Replace X* X
Air Filter
Check X*
Clean X*
Spark Plug
Check/Clean/
Regap
X
Change X X
Fuel
Check Level X
Drain X X
Carburetor Drain X X
Spark
Arrestor
Check/Clean X
Table 4 - Recommended Maintenance Schedule* Clean/change more often under dusty conditions
or operating under heavy load.
MAINTENANCE
24
CLEANING THE GENERATOR
Keep the generator clean to prevent improper operation or machine damage from dirt and debris. Inspect all ventila-
tion openings on the generator. These openings must be kept clean and unobstructed.
If the generator becomes dirty, use a damp cloth to wipe exterior surfaces. Use a soft bristle brush to loosen dirt and
oil and use a vacuum to pick up loose dirt. Use low pressure air (not to exceed 25 PSI) to blow away dirt.
DRAINING THE CARBURETOR
We recommend draining the carburetor after every use and before storing the generator. Draining the carburetor
can help prevent build-up and blockages caused by stagnant fuel inside of the carburetor.
1. Prepare an approved gasoline-storage container under the
carburetor to collect the drained fuel.
2. The carburetor can be accessed from the backside of the
generator between the engine and the air filter. To drain the
carburetor, open up the carburetor drain screw (Fig. 14 - 1)
with a Phillips-head screwdriver (not included) and drain out
any gasoline that has built up inside.
3. Once the fuel has drained, close the drain screw.
NOTE: Make sure to drain your carburetor before storing the
generator for long periods of time.
MAINTENANCE
WARNING! Never clean the generator when it is running! Never clean with a bucket of water or a hose. Water
can get inside the working parts of the generator and cause corrosion or a short circuit.
Fig. 14
1
25
CHECKING/ADDING OIL
Check the oil level before each use and every 8 hours of operation.
The oil capacity of the generator engine is 20.3 fl. ounces. Add oil when the oil level is low. For proper type and
weight of oil refer to “add oil” portion of the “Generator Preparation” section. This is a critical step for proper engine
starting. The generator is equipped with an automatic shutoff to protect it from running on low oil.
To check the oil level and add oil:
1. Make sure the generator is on a level surface. Do not tilt the generator, as oil will flow into engine areas and cause
damage. Keep generator level!
2. Clean around the oil fill. Remove the dipstick and wipe the it with a clean rag.
3. Insert the dipstick into the oil fill opening without screw-
ing in. Remove the dipstick to check the oil mark (Fig. 15).
Add oil if the oil mark covers less than one half of the dip-
stick.
4. Using a funnel or appropriate dispenser, slowly add more
oil. Repeat step 3 until the oil mark reaches the top of the
dipstick (you can see oil coming up the threads of the oil
fill). Do not over fill.
5. Reinstall dipstick and wipe clean any spilled oil with a rag.
Reinstall the oil access cover.
DRAINING/CHANGING OIL
Change the oil according to the Recommended Mainte-
nance Schedule.
Change the oil more often if operating under heavy load or
high ambient temperatures. It is also necessary to drain the
oil from the crankcase if it has become contaminated with
water or dirt. Changing the oil when the engine is warm al-
lows for complete drainage.
To drain the oil from the generator:
1. Place generator on elevated platform. Prepare an ap-
proved gasoline-storage container underneath the oil drain
bolt next to the oil dipstick to catch the oil as it drains.
2. Unscrew the oil drain bolt (Fig. 16) and allow oil to drain
from the engine completely.
3. Reinstall the oil drain bolt and tighten it securely. Wipe
clean any oil spillage.
NOTE: Never dispose of used engine oil in the trash or down
a drain. Please call a local recycling center or auto garage to
arrange proper oil disposal.
MAINTENANCE
Lower Limit
Upper Limit
Fig. 15
Fig. 16
Oil Drain Bolt
26
AIR FILTER MAINTENANCE
Check every 50 hours of operation (refer to Recommended Maintenance Schedule).
Routine maintenance of the air filter helps maintain proper airflow to the carburetor. Occasionally check that the air
filter is free of excessive dirt. Clean air filter more frequently in dirty or dusty conditions
To inspect and clean the air filter:
1. Remove the air filter cover (Fig. 17) by undoing the clasps at the
top and bottom of the air filter cover.
2. Remove the sponge-like air filter element from the casing. Wipe
excessive oil and any dirt from inside of the air filter casing.
3. Check and clean the foam air filter element. Good elements can be
washed in soapy water. Dry the element in clean cloth (do not twist
it). A small amount of oil left in the element is normal and necessary
for the engine to work properly.
If the air filter element has been damaged, replace it with a new one.
Replacement air filters can be ordered from wenproducts.com by
searching part no. DF475-166.1.
4. Reinstall the air filter element and air filter cover.
MAINTENANCE
Fig. 17
Air Filter
Cover
WARNING! Running the engine with a dirty, damaged or missing air filter element can result in danger to the
operator and cause the engine to wear out prematurely.
SPARK ARRESTOR MAINTENANCE
The spark arrestor is located outside the muffler, which gets very hot
during operation. Allow the engine to cool completely before servic-
ing the spark arrestor. To inspect and clean the spark arrestor:
1. Remove the screws holding the cover plate which retains the end
of the spark arrestor to the muffler (Fig. 18 - 1).
2. Remove the spark arrestor screen.
3. Carefully clean and remove the carbon deposits from the spark
arrestor screen with a wire brush. Replace the spark arrestor if it is
damaged.
4. Reinstall the spark arrestor in the muffler and secure it in place with
the screws.
Fig. 18
1
27
To inspect or replace the spark plug:
1. Pull on the spark plug boot to remove it (Fig. 19). Be careful not to
tear insulation or wire.
2. Remove the spark plug rubber boot and unscrew the spark plug
from the engine using the spark plug wrench provided.
TIP: There is limited space for the wrench to turn. Use both rows of
holes in the spark plug wrench to gain leverage to loosen the plug.
3. Visually inspect the spark plug. If it is cracked or chipped, or if
the electrodes are worn or burned, discard it and replace with a new
spark plug.
We recommend replacing with an NGK BP7ES/Torch F7TC spark plug
(part no. DF475-145), available for purchase at
wenproducts.com.
4. If re-using the spark plug, use a wire brush to clean any dirt from
around the spark plug base, then re-gap the spark plug.
5. Measure the plug gap with a spark plug gap gauge. The gap should
be 0.7 to 0.8 mm (0.028-0.031 in.) (Fig. 20). Carefully adjust the gap
if necessary.
6. Screw the spark plug back into the spark plug hole using the spark
plug wrench. Do not over-tighten spark plug. Recommended tighten-
ing of spark plug is ½ to ¾ of a turn (15 ft-lb torque/20.33 Nm) after
spark plug gasket contacts spark plug hole.
7. Reinstall the spark plug boot over the spark plug.
SPARK PLUG MAINTENANCE
Refer to Recommended Maintenance Schedule for maintaining the spark plug.
The spark plug is important for proper engine operation. Check the spark plug regularly to maintain proper engine
operation. A good spark plug should be intact, free of deposits, and properly gapped.
MAINTENANCE
Fig. 19
Spark PlugSpark Plug
BootBoot
Spark Plug
Boot
Fig. 20
0.7 - 0.8 mm
CylinderCylinder
AssemblyAssembly
Cylinder
Assembly
28
DRAINING THE FUEL TANK
Drain and clean the fuel tank each year, or before storing the generator for longer than two months.
To drain the fuel tank:
1. Prepare an approved gasoline-storage container to collect the drained fuel. Place it near the fuel valve.
2. Turn the fuel valve to the OFF position.
3. Locate the fuel line between the fuel valve and back of control panel. Disconnect the fuel line from the fuel valve.
NOTE: A small amount of fuel may leak from the fuel line during removal.
4. Place a funnel below the fuel valve opening, and direct the other end of the funnel over the prepared container.
Turn the fuel valve to ON to start draining the fuel from the fuel valve opening.
5. Once the fuel is drained, shut OFF the fuel valve.
6. Start and run the engine until the fuel runs out.
7. Drain the carburetor.
8. Store the emptied gasoline in a suitable place. DO NOT store flammable materials near the gasoline. Do not store
fuel for more than 3 months.
CAUTION: Store the emptied gasoline in a suitable place. Never store fuel for more than 2 months.
MAINTENANCE
NOTE: You can also drain the fuel tank through the carburetor. Follow the procedures in “Draining the Carburetor”,
and turn the fuel valve ON. It may take a while for the fuel tank to drain, depending on the amount of fuel in the tank.
TESTING THE GFCI OUTLETS
Test the GFCI outlets monthly. The GFCI outlets have two buttons between the re-
ceptacles (refer to Fig. 21):
• RESET (upper)
• TEST (lower)
To test:
1. Start the generator according to the instructions in this manual. Wait a few min-
utes for the generator to stabilize its speed and voltage output.
2. Press the RESET button on the GFCI outlet (Fig. 21).
3. Connect a device to the outlet and turn it ON.
4. With the device ON, press the TEST button on the GFCI outlet. The power to the
device should be cut off instantly, and the device should turn OFF.
5. Disconnect the device from the outlet and press the RESET button again. Shut
down the generator normally.
CAUTION: If the device does not instantly turn OFF, you may have a faulty GFCI outlet. Call customer service
Fig. 21
29
TRANSPORTING THE GENERATOR
To prevent fuel spillage when transporting, be sure to perform the following to your generator:
1. Tighten the fuel cap and make sure the fuel valve is turned OFF.
2. Make sure the engine switch is in the OFF position.
3. Drain the fuel tank if possible (see “Draining the Fuel Tank”).
4. Keep the generator upright. Never place the generator on its side or upside down - doing so could damage the
internal components of the generator and make it difficult to start.
STORING THE GENERATOR
Shut off the generator and allow the unit to cool to room temperature before storing it. Never place any type of stor-
age cover on the generator while it is still hot. Do not obstruct any ventilation openings.
Follow the procedures below for properly storing your generator. We highly recommend running your generator
once a month for 20 to 30 minutes. Plug in a small load in to ensure there is proper power output.
For Short Periods (30 to 60 Days):
• Drain the carburetor.
• Add fuel stabilizer:
Follow the suggested portions and instructions of your
preferred stabilizer. Run the engine for 15 to 20 minutes,
allowing the fuel stabilizer to mix with the gasoline and
circulate through the carburetor, and then top off with fuel.
Filling the fuel tank full reduces the amount of air in the
tank and helps fight deterioration of fuel.
For Extended Periods
(Over 60 Days):
• Drain the fuel tank and carburetor (see
“DRAINING THE FUEL TANK”). NEVER store
generator with fuel in the tank for more than two
months.
• Change the engine oil (see “CHANGING OIL”).
PRODUCT DISPOSAL
Do not dispose of used generator or parts with your household waste. This product contains electrical or electronic
components that should be recycled. Please take this product to your local recycling facility for responsible disposal
to minimize its environmental impact.
Do not dispose of used oil or fuel in the trash or down a drain. Please contact your local recycling center or auto
garage to arrange proper oil/fuel disposal.
TRANSPORTATION & STORAGE
WARNING! Avoid direct sunlight inside a vehicle. If the generator is left in an enclosed vehicle for many
hours, the high temperature could cause the fuel to vaporize and result in a possible explosion.
WARNING! Store the generator upright in a cool and dry location, away from sources of heat, open flames,
sparks or pilot lights.
30
PROBLEM POSSIBLE CAUSE SOLUTION
Engine will not start.
1. Engine switch is set to OFF. 1. Set engine switch to ON.
2. Fuel valve is turned to OFF. 2. Turn fuel valve to ON.
3. Oil is low. 3. Add or replace oil.
4. Engine is out of fuel. 4. Add fuel.
5. Engine is filled with
contaminated or old fuel.
5. Drain fuel in the tank. Fill with fresh fuel.
6. Spark plug is dirty or broken. 6. Clean or replace the spark plug.
7. Carburetor is air locked.
7. Shut off the fuel valve. Remove the bolt from the bottom of the carbure-
tor. Take off the carburetor bowl to allow it to reset. Replace carburetor bowl
and reinstall the bolt.
8. Propane tank is OFF. 8. Turn tank ON.
9. Regulator is stuck.
9. Turn OFF propane tank. Disconnect hose from onboard regulator. Spray
a small amount of penetrating oil into regular inlet, then gently insert a pin
into inlet to break valve free.
Engine runs but there
is no electrical output
from the GFCI outlets.
1. GFCI has been tested but not
reset.
1. Press RESET button on GFCI outlet.
2. Defective GFCI outlet. 2. Contact customer service at 1-800-232-1195.
Engine runs but there
is no electrical output
whatsoever.
1. Circuit breaker has been tripped
due to overload.
1. Turn off and unplug electrical device(s). Wait 5 minutes, then press circuit
breaker to reset. Check total wattage of the devices and reduce load if it ex-
ceeds the capacity of the generator. Then plug the loads back in one by one.
2. Bad connecting cords/wires.
2. Check the power cords and extension cords. Do not use if any cord is
damaged. Replace damaged cords immediately.
3. Bad electrical device connected
to the generator.
3. Try connecting a different device.
4. Voltage regulator is bad 4. Check voltage regulator with a multimeter, replace if necessary.
5. Carbon brushes worn or need
adjustment
5. Check carbon brushes, adjust so that both brushes extrude the same
length, or replace if worn.
Generator runs but does
not support all electrical
devices connected.
1. Generator is overloaded.
1. Turn off and unplug all electrical devices. Wait 5 minutes, then press the
circuit breaker to reset. Reduce load as necessary, then plug devices back in
one by one.
2. Short circuit in one of the
devices.
2. Try disconnecting any faulty or short-circuited electrical loads.
3. Air filter is dirty. 3. Clean or replace the air filter element.
Engine is “hunting” dur-
ing operation (engine
RPM is fluctuating).
1. The fuel isn’t running through the
fuel valve.
2. The air filter is clogged.
3. The muffler or spark arrestor is
blocked
4. There is gunk in the carburetor
preventing a consistent fuel/air
mixture.
Turn off the generator and wait for it to cool down.
Perform the following steps:
1. Check if the fuel is properly and consistently going through the fuel valve
2. Check for any blockage in the air filter. Check and clean the air filter as
necessary.
3. Check if the spark arrestor is blocked. Clean with metal brush as neces-
sary.
4. Use “gunk remover” spray on the carburetor jets.
TROUBLESHOOTING GUIDE
WARNING! Stop using the generator immediately if any of the following problems occur or risk serious
personal injury. If you have any questions, please contact customer service at 1-800-232-1195 (M-F 8-5 CST),
or email [email protected].
31
WIRING DIAGRAM
32
EXPLODED VIEW & PARTS LIST
GENERATOR
33
EXPLODED VIEW & PARTS LIST
GENERATOR
No. Part No. Description Qty.
1 DF475X-001 Alternator Assembly 1
1.1 DF475-001.3 Rotor 1
1.2 DF475-001.2
Grounding Post
Assembly
1
1.3 DF475-001.1
Carbon Brush
Assembly
1
1.4 DF475-001.4 Stator 1
2 DF475-002 Motor Stand 1
3 DF475-003
Switch Dial
Assembly
1
4 DF475-004
Hexagon Pattern
Pan Head Screws
M6X12
1
5 DF475-005 Nut M8 2
6 DF475-065
Tooth Type Gasket
Ø6
1
7 DF472-007 Frame 1
8 DF475-008 Isolator A 2
9 DF475-009 Isolator B 2
10 DF475-045 Nut M6 1
11 DF475X-011 Fuel Tank Assembly 1
11.1 DF475-079 Fuel Tank Filter 1
11.2 DF475-078 Fuel Gauge 1
12 GN4500-012 Fuel Cock 1
13 DF475X-013 Regulator Assembly 1
14 DF475X-014 Regulator 1
15 DF472-015 Foot 4
16 DF475-046 Bolt M816 2
17 DF475-017 Bolt M8-1x220 1
18 DF475-018
Rotor Bolt Gasket
Ø8.5x24x3
1
19 DF475-047 Clip Ø12 2
20 DF475-020 Bolt M6x175 4
21 DF475-021 Bolt M6x12 17
No. Part No. Description Qty.
22 DF472-022ASM Engine Assembly 1
23 DF475-023 Air Cleaner Bracket 1
24 DF475-024 Exhaust Packing 1
25 DF475-069 Grounding Wire 1
26 DF475-026 Muffler Comp 1
27 DF475-027 Spring Washer Ø8 2
28 DF475X-028
Vibration Isolation
Pad
1
29 DF472-029ASM
Control Panel
Assembly
1
29.1 DF472-029.1 Engine Switch 1
29.2 DF475-029.2 DC Receptacle, 12V 1
29.3 DF475-029.3 DC Breaker, 8A 1
29.4 DF475X-029.4
NEMA 5-20R 120V
20A GFCI Duplex
Outlet
1
29.5 DF475-029.5 AC Breaker, 20A 1
29.6 DF475-029.9 Grounding Lug 1
29.7 DF475-029.6
Voltage Selector
Switch
1
29.8 DF475-029.7 AC Breaker, 16A 1
29.9 DF475-029.8
NEMA L14-30R
125V/250V 30A
Receptacle
2
29.10 DF472-029.10 Panel Rear Cover 1
29.11 DF472-029.11 Panel 1
30 DF472-030 Fuel Line Clip Ø8.5 2
31 DF475-062 Frame Wire 1
32 DF475X-061 Fuel Line Clip Ø9.5 2
33 DF475-033 Voltage Regulator 1
34 DF475-034 Bolt M5x16 1
35 DF475-035 Bolt M5x12 7
36 DF475-064 Nut M8 10
37 DF475X-037 Bolt M6x25 4
34
EXPLODED VIEW & PARTS LIST
GENERATOR
No. Part No. Description Qty.
38 DF475-038 End Cover 1
39
DF472-039ASM
Fuel Selector Switch
Assembly
1
40
41
42
43
44
45
46
47
48
49 DF475-072 Paper Washer 5
50 DF475-050 Muffler Bracket 1
No. Part No. Description Qty.
51 DF475X-073
Fuel Tank Cap
Assembly
1
52 DF475X-052 Battery Bolt 1
53 DF475-077 Dustproof Sheet 1
54 DF475X-054 Low Pressure Hose 1
55 DF475-074
LPG Regulator
Cover
1
56 DF475X-075
Carbon Tank
Assembly
1
57 DF472-057 Breather Tube 1 1
58 DF475-058 Breather Valve 1
59 DF472-059 Breather Tube 2 1
60 DF475-060 Fuel Line Clip Ø7.5 1
35
EXPLODED VIEW & PARTS LIST
ENGINE
36
EXPLODED VIEW & PARTS LIST
ENGINE
No. Part No. Description Qty.
1 DF475-101 Crankcase 1
2 DF475-102 Ball Bearing 2
3 DF475-103 Oil Seal 2
4 DF475-104 Governor Assembly 1
5 DF475-105 Governor Arm Shaft 1
6 DF475-106
Governor Arm Shaft
Washer
1
7 DF475-107 Lock Pin 1
8 DF475-108 Drain Plug Bolt 2
9 DF475-109 Drain Plug Washer 2
10 DF475-110
Oil Level Switch
Assembly
1
11 DF475-111 Bolt M6x16 2
12 DF475-112
Crankcase Cover
Dowel Pin, Ø8x12
2
13 DF475-113 Piston 1
14 DF475-114
Piston Scraper Ring
Set
1
15 DF475-115
Connecting Rod
Assembly
1
16 DF475-116 Piston Pin 1
17 DF475-117 Piston Clip 2
18 DF475-118
Crankcase Cover
Assembly
1
19 DF475-119 Cylinder Head 1
20 DF475-120 In-Valve 1
21 DF475-121 Valve Exhaust 1
22 DF475-122
Intake Valve
Returner
1
23 DF475-123 Valve Spring 2
24 DF475-124 In-Valve Spring Seat 1
25 DF475-125 Ex-Valve Spring Seat 1
No. Part No. Description Qty.
26 DF475-126
Push Rod Guide
Plate
1
27 DF475-127 Rocker Assembly 2
28 DF475-128 Rotator 1
29 DF475-129 Carburetor Stud Bolt 2
30 DF475-130 Stud Bolt 2
31 DF472-131
Carburetor
Assembly
1
32 DF472-132 Fuel Line 1
33 DF475-133
Clip, Fuel Line ɸ7.5
1
34 DF475-134 Governor Arm 1
35 DF472-135 LPG Line 1
36 DF475-136 Nut M6 2
37 DF475-137
Crankshaft
Assembly
1
38 DF475-138 Valve Lifter 2
39 DF475-139 Casecover Packing 1
40 DF475-140 Camshaft Assembly 1
41 DF475-141 Dowel Pin 2
42 DF475-142 Bolt M8x30 6
43 DF475-143
Cylinder Head
Gasket
1
44 DF475-144 Bolt M8x60 4
45 DF475-145
Spark Plug, Torch
F7TC (NGK BP7ES)
1
46 DF475-146 Push Rod 2
47 DF475-147 Shroud 1
48 DF475-148 Bolt M6x12 12
49 DF475-149 Headcover Packing 1
50 DF475-150 Cylinder Head Cover 1
51 DF472-151 Shroud 1
52 DF472-152 Bolt, M6x20 1
53 DF475-153 Recoil Starter Fan 1
37
EXPLODED VIEW & PARTS LIST
ENGINE
No. Part No. Description Qty.
54 DF475-154 Starter Pulley 1
55 DF475-155 Nut, M14 1
56 DF475-156
Ignition Coil
Assembly
1
57 DF475-157 Bolt, M6x25 2
58 DF475-158 Intake Packing 1
59 DF475-159 Carburetor Insulator 1
60 DF475-160 Carburetor Packing 1
61 DF475-161 Carburetor Spacer 1
62 DF475-162 Governor Rod 1
63 DF475-163
Throttle Return
Spring
1
64 DF472-164
Recoil Starter
Assembly
1
No. Part No. Description Qty.
65 DF475-165
Upper Shroud
Assembly
1
66
DF472-
166ASM
Air Filter Assembly 1
N.P. DF472-166.1 Air Filter Element 1
67 DF475-167 Breather Tube 1
68 DF472-168 Clip 1
69 DF475-169 Governor Spring 1
70 DF475-170 Clip 1
71 DF475-171 Dipstick 1
72 DF475-172 Bolt, M6x30 2
73 DF472-173 Flywheel Assembly 1
38
WARRANTY STATEMENT
WEN Products is committed to building tools that are dependable for years. Our warranties are consistent with this
commitment and our dedication to qualit
y.
LIMITED WARRANTY OF WEN PRODUCTS FOR HOME USE
GREA
T LAKES TECHNOLOGIES, LLC (“Seller”) warrants to the original purchaser only, that all WEN consumer
power
tools
will be free from defects in material or workmanship during personal use for a period of two (2) years from
date
-
fessional or commer
cial use. Purchaser has 30 days from the date of purchase to report missing or damaged parts.
SELLER’S SOLE OBLIG
ATION AND YOUR EXCLUSIVE REMEDY under this Limited Warranty and, to the extent per-
mitted
by law, any warranty or condition implied by law, shall be the replacement of parts, without charge, which
are
defective
in material or workmanship and which have not been subjected to misuse, alteration, careless handling,
misrepai
r, abuse, neglect, normal wear and tear, improper maintenance, improper storage, incorrect lubricants/
fuels,
or other conditions adversely affecting the Product or the component of the Product, whether by accident or
intentionall
y, by persons other than Seller. To make a claim under this Limited Warranty, you must make sure to
keep
-
chase. Place of Pur
chase must be a direct vendor of Great Lakes Technologies, LLC. Pur
chasing through third party
vendors,
including but not limited to garage sales, pawn shops, resale shops, or any other secondhand merchant,
voids the warranty included with this product. Contact [email protected] or 1-800-232-1195 with the
following
information to make arrangements: your shipping address, phone number, serial number, required part
numbers, and proof of pur
chase. Damaged or defective parts and products may need to be sent to WEN before the
replacements can be shipped out.
-
turning
a product for warranty service, the shipping charges must be prepaid by the purchaser. The product must
be
shipped in its original container (or an equivalent), properly packed to withstand the hazards of shipment. The
product
must be fully insured with a copy of the proof of purchase enclosed. There must also be a description of
the
will be returned and shipped back to the pur
chaser at no charge for addresses within the contiguous United States.
THIS
LIMITED WARRANTY DOES NOT APPLY TO ITEMS THAT WEAR OUT FROM REGULAR USAGE OVER TIME,
INCLUDING
FILTERS, SPARK PLUGS, VOLTAGE REGULATORS, BRUSHES, GASKETS, O-RINGS, WHEEL KITS, BAT-
TERIES,
RECOIL STARTERS, HIGH PRESSURE HOSES, SPRAY GUNS, ETC. ANY IMPLIED WARRANTIES SHALL
BE
LIMITED IN DURATION TO TWO (2) YEARS FROM DATE OF PURCHASE. SOME STATES IN THE U.S. AND
SOME
CANADIAN
PROVINCES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE
ABOVE LIMIT
ATION MAY NOT APPLY TO YOU.
IN
NO EVENT SHALL SELLER BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING BUT
NOT
LIMITED TO LIABILITY FOR LOSS OF PROFITS) ARISING FROM THE SALE OR USE OF THIS PRODUCT. SOME
ST
ATES IN THE U.S. AND SOME CANADIAN PROVINCES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF IN-
CIDENT
AL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
THIS
LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER
RIGHTS
WHICH
VARY FROM STATE TO STATE IN THE U.S., PROVINCE TO PROVINCE IN CANADA AND FROM COUNTRY
TO COUNT
RY.
THIS
LIMITED WARRANTY APPLIES ONLY TO ITEMS SOLD WITHIN THE UNITED STATES OF AMERICA, CANADA
AND
THE COMMONWEALTH OF PUERTO RICO. FOR WARRANTY COVERAGE WITHIN OTHER COUNTRIES, CON-
T
ACT THE WEN CUSTOMER SUPPORT LINE. FOR WARRANTY PARTS OR PRODUCTS REPAIRED UNDER WAR-
RANTY
SHIPPING TO ADDRESSES OUTSIDE OF THE CONTIGUOUS UNITED STATES, ADDITIONAL SHIPPING
CHARGES MAY APPLY.
V. 2022.05.24
39
V. 2022.05.24
THANKS FOR
REMEMBERING
