WEN 56475 User Manual
MODEL 4750
223 cc Generator
Questions? Problems?
Please call our customer help line:
(800) 232-1195 M-F 8-5 CST
Item # 56475
Owner’s Manual
Manual del Propietario
FEATURES
4750 Surge Watt Output
3750 Rated Watt Output
Powerful Enough to Run Essential Appliances During Power Outages
120 Volt AC 20A Outputs
120 Volt AC 30A Output
120 Volt RV Output
Low Oil Automatic Shutoff
Circuit Breaker for Overload Protection
4 Gallon Fuel Tank Capacity
Digital Engine Hour Counter
Electric Starter
Spark Arrester
Meets EPA and CARB Emission Standards
2014
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GENERATOR IDENTIFICATION
Date
Date
Date
Date
Date
Date
Oil Change
Change spark plug
Clean Fuel Tank
Clean Filter Cup
Clean Air Cleaner
For information and questions, please contact the Customer Service Help Line by calling 800-232-
1195. Certain information will be requested by the Customer Service Representative and to facilitate
that, please fill in the information below.
Refer to the illustration below for the location of Serial Number. Record generator information in the
spaces provided below.
DATE OF PURCHASE: ______________________________________________
PURCHASED FROM: ______________________________________________
GENERATOR MODEL NUMBER: ____________________________________
ENGINE SERIAL NUMBER: _________________________________________
ENGINE SERIAL NUMBER
SERVICE RECORD
Record Service Dates:
TABLE OF CONTENTS
GENERATOR IDENTIFICATION ................................................................................................ i
SERVICE RECORD ......................................................................................................................... i
INTRODUCTION ............................................................................................................................ 1
SAFETY INFORMATION .............................................................................................................. 2
GENERAL SAFETY PROCEDURES ........................................................................................... 3
IMPORTANT SAFETY INSTRUCTIONS ................................................................................... 5
PACKAGE CONTENTS ................................................................................................................. 6
GENERATOR COMPONENTS ..................................................................................................... 7
ASSEMBLY ...................................................................................................................................... 8
GENERATOR PREPARATION .................................................................................................. 10
Using the Generator for the First Time ........................................................................................ 10
Step 1 - Fill Oil ......................................................................................................................... 10
Step 2- Add Gasoline ................................................................................................................ 11
Step 3- Ground the Generator ................................................................................................... 12
Step 4- Connect the Battery…………………………………………………………………. 13
STARTING THE GENERATOR ................................................................................................. 14
SUBSEQUENT STARTING OF THE GENERATOR ............................................................... 17
Step 1- Check the Oil ............................................................................................................... 17
Step 2 – Check the Gas Level ................................................................................................... 17
Step 3- Ground the Generator ................................................................................................... 18
USING THE GENERATOR ......................................................................................................... 19
AC Usage ...................................................................................................................................... 19
STOPPING THE GENERATOR ................................................................................................. 22
MAINTENANCE / CARE ............................................................................................................. 23
Cleaning the Generator ................................................................................................................. 23
Checking the Oil ........................................................................................................................... 23
Changing/ Adding Oil .................................................................................................................. 24
Air Cleaner Maintenance .............................................................................................................. 25
Fuel Filter Cup Cleaning .............................................................................................................. 25
Spark Plug Maintenance ............................................................................................................... 26
Draining the Fuel Tank ................................................................................................................. 26
STORAGE / TRANSPORT PROCEDURES .............................................................................. 27
SPECIFICATIONS ........................................................................................................................ 28
TROUBLESHOOTING ................................................................................................................. 29
EXPLODED VIEW AND PARTS LIST ...................................................................................... 30
WIRING DIAGRAM ..................................................................................................................... 35
HIGH ALTITUDE OPERATION ABOVE 3000 FEET............................................................. 36
WARRANTY STATEMENT ........................................................................................................ 38
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INTRODUCTION
Thank You for Purchasing a WEN® Product.
This manual provides information regarding the safe operation and maintenance of this product.
Every effort has been made to ensure the accuracy of the information in this manual.
WEN® reserves the right to change this product and specifications at any time without prior notice.
Please keep this manual available to all users during the entire life of the generator.
Special Messages
This manual contains special messages to bring attention to potential safety concerns, generator
damage as well as helpful operating and servicing information. Please read all the information
carefully to avoid injury and machine damage.
Questions? Problems?
In order to answer questions and solve problems in the most efficient and speedy manner,
contact Customer Service at:
(800) 232-1195 M-F 8-5 CST
NOTICE REGARDING EMISSIONS
Engines that are certified to comply with U.S. EPA emission regulations for SORE (Small Off
Road Equipment), are certified to operate on regular unleaded gasoline, and may include the
following emission control systems: (EM) Engine Modifications and (TWC) Three-Way Catalyst
(if so equipped).
SAFETY INFORMATION
Before operating this generator read and observe all warnings, cautions, and instructions on
this sheet, on the generator, and in the Owner’s Manual.
NOTE: The following safety information is not meant to cover all possible conditions and
situations that may occur. Read the entire Owner’s Manual for safety and operating
instructions. Failure to follow instructions and safety information could result in serious
injury or death.
This safety alert symbol is used to identify safety information about hazards that can result in
personal injury.
A signal word (DANGER, WARNING, or CAUTION) is used
with the alert symbol to indicate the likelihood and the potential severity of injury.
In addition, a hazard symbol may be used to represent the type of hazard.
DANGER indicates a hazard, which, if not avoided, will result in death or serious
injury.
WARNING indicates a hazard, which, if not avoided, could result in death or
serious injury.
CAUTION indicates a hazard, which, if not avoided, might result in minor or
moderate injury.
CAUTION, when used without the alert symbol, indicates a situation that could
result in damage to the engine or generator.
SAFETY SYMBOLS AND MEANINGS
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GENERAL SAFETY PROCEDURES
For any questions regarding the hazard and safety notices listed in this manual or on the
product, please call (800) 232-1195 M-F 8-5 CST before using the generator.
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, crawlspaces, or other partly enclosed
areas. Deadly levels of carbon monoxide can build up in these areas. Using a fan or
opening windows and doors does NOT supply enough fresh air.
ONLY use 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 batterypowered 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: 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.
Do not smoke near 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.
Empty fuel tank before storing or transporting the generator.
Before transporting, turn fuel valve to off and disconnect spark plug cap.
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WARNING: This generator produces powerful voltage, which can
result in electrocution.
ALWAYS ground the generator before using it (see the “Ground the Generator”
portion of the “GENERATOR PREPARATION” section).
Generator should only be plugged into electrical devices, either directly or with an
extension cord. NEVER connect to a building electrical system without a qualified
electrician. 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.
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.
Do not use in rainy conditions.
Do not touch bare wires or receptacles (outlets).
Do not allow children or non-qualified persons to operate.
WARNING: This generator produces heat when running. Temperatures
near exhaust can exceed 150º F (65º C).
Do not touch hot surfaces. Pay attention to warning labels on the generator identifying
hot parts of the machine.
Allow generator to cool down after use before touching engine or areas of the generator
that become hot during use.
CAUTION: Misuse of this generator can damage it or shorten its life.
Use generator only for its intended purposes.
Operate only on dry, level surfaces.
Allow generator to run for several minutes before connecting electrical devices.
Shut off and disconnect any malfunctioning devices from generator.
Do not exceed the wattage capacity of the generator by plugging in more electrical devices
than the unit can handle.
Do not turn on electrical devices until after they are connected to the generator.
Turn off all connected electrical devices before stopping the generator.
Turn engine switch to “off” position when the engine is not running.
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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS – This manual contains important instructions for
WEN® 4750 generator that should be followed during installation and maintenance of the
generator.
Generators vibrate in normal use. During and after the use of the generator, inspect the
generator as well as extension and power supply cords connected to it for damage resulting
from vibration. Have damaged items repaired or replaced as necessary. Do not use plugs or
cords that show signs of damage such as broken or cracked insulation or damaged blades.
For power outages, permanently installed stationary generators are better suited for
providing backup power to the home. Even a properly connected portable generator can
become overloaded. This may result in overheating or stressing the generator components,
possibly leading to a generator failure.
WARNING: When this generator is used to supply a building wiring system:
Generator must be installed by a qualified electrician and connected to a transfer switch as
a separately derived system in accordance with the National Electrical Code, NFPA 70.
The generator shall be connected to a transfer switch that switches all conductors other than
the equipment grounding conductor. The frame of the generator shall be connected to an
approved grounding electrode.
In addition to the previous safety notices, please become familiar with the safety and hazard
markings on the generator.
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PACKAGE CONTENTS
Your generator comes with the items listed below. Please check to see that all of the following
items are included with your generator.
If there are any damaged or missing items, please call (800) 232-1195 M-F 8-5 CST for
customer service.
Generator, Spark Plug Wrench, Mobility Kit, funnel, 0ne bottle of oil, 120V 20A Plug, 120V 30A
Plug and 120V RV Plug.
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GENERATOR COMPONENTS
(1) Fuel Gauge- Indicates the amount of fuel in the
tank.
(2) Fuel Cap- Access to the fuel tank for adding
fuel.
(3) Digital Engine hour counter
(4) Power Indicator-Green lights that turn on to
indicate the output of power to each receptacle.
(5) 120 Volt AC Duplex Receptacle- To connect
electrical devices that run 120 Volt, 60 Hz,
single phase, AC current.
(6) 120 Volt AC Receptacle- To connect electrical
devices that run 120 Volt, 30A, 60 Hz, single
phase, AC current.
(7) 30A Circuit Reset Button- Reset button that
protect the generator from electrical overload.
(8) 120V 30A RV Receptacle
(9) Grounding Nut
(10) 20A Circuit Reset Button- Reset button that
protect the generator from electrical overload.
(11) 8" Wheels- For easy transport.
(12) 12V Battery
(13) Oil Fill and Dipstick- Location for checking and
filling engine oil.
(14) Engine Switch- Used to start/stop engine.
(15) Handles- For easy transport.
(16) Recoil Starter- Pull-cord for starting engine.
(17) Fuel Valve- Allows fuel to enter engine.
(18) Air Cleaner- a removable, cleanable, sponge-like
element that limits the amount of dirt pulled into the
engine.
(19) Choke Lever
Please familiarize yourself with the locations and functions of the various components and controls
of your generator.
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ASSEMBLY
In order to best protect the generator while in the package, this product comes with some
components disassembled. Please complete the following assembly steps before proceeding to use
the generator. For ease of assembly, we recommend attaching the components in the order listed in
this manual.
If after reading this section, you are unsure about how to perform any of the steps, please call
(800) 232-1195 M-F 8-5 CST for customer service.
WARNING: This generator is heavy. Some assembly procedures may require
lifting equipment or two people.
Attach Feet
To attach the feet to the generator, perform the following steps:
1. Stack the two generator wheels on top of each other. Lift the end of the generator that has
the recoil starter onto the stack of wheels (see figure 1). Be careful not to obstruct any
holes on the generator frame.
2. Place one leg onto the frame as shown in figure 2. Line up the holes on the generator
frame with the holes on the bracket portion of the leg. Tighten using two M6x40 bolts, two
M6 nuts, and the included wrench.
3. Repeat step 2 for the other generator leg.
Figure 1- Stacking the wheels
a b
Figure 2- foot assembly
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Attach Handles
a b
The handles attach to the generator frame on the same side as the recoil starter (Left side when
facing control panel). To attach the handles to the generator frame, perform the following steps:
1. Take one handle and line up the holes in the handle bracket with the holes on the
generator frame.
2. Slide a bolt through the holes in the handle and generator frame to hold the handle onto
the frame.
3. Secure the bolt in place with a nut.
4. Repeat steps 1-3 for the other handle.
At this point, gently remove the two wheels from underneath the generator.
Attach Wheels
To attach the wheels to the generator, perform the following steps:
1. Find a wood block or similar item that is 3 inches thick or greater and rest the exhaust end
of the generator on the block as shown in figure 4.
2. Take one wheel shaft, and one M12 nut as shown. Slide the wheel shaft, with the threaded
part facing inward, through the frame. Secure using an M12 nut and the included wrench as
shown in figure 5.
3. Slide the wheel onto the axle and secure in place using the nut.
4. Repeat steps 2 and 3 for the other wheel.
At this point, the generator assembly is complete. Gently remove the generator from the wood
block.
Figure 4- supporting the generator Figure 5- axle assembly
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GENERATOR PREPARATION
Using the Generator for the First Time
The following section describes steps necessary to prepare the generator for use. If after
reading this section, you are unsure about how to perform any of the steps please call (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 - Fill 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 crankcase is 17 fluid oz.
Select good quality detergent oil bearing the American Petroleum Institute (API) service
classifications SJ, SL, or SM. (Synthetic oils may be used.) Use the SAE viscosity grade
of oil from the following chart that matches the starting temperature anticipated before
the next oil changes.
Figure 7- Engine oil recommendations
To fill oil to the crankcase, follow these steps:
1. Make sure the generator is on a level surface. Tilting the generator to assist in filling will
cause oil to flow into engine areas and will cause damage. Keep generator level!
2. Remove the oil filler/dipstick cap from the engine as shown in figure 8.
3. Using a funnel, add the appropriate type and amount of oil into the crankcase. The
crankcase is full when the oil level has reached the second thread from the lip of the
opening (see figure 9).
4. Check for oil leaks. Reinstall oil filler cap before starting engine.
Figure 8- Unscrewing the oil cap Figure 9- filling oil
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