Introduction

The FNA Group Simpson PowerShot Generator SPG3645 is a robust and portable power solution ideal for various applications, including work sites, recreational activities, and emergency backup. With a powerful 3,600 running watts and 4,500 starting watts provided by its reliable CRX 225 engine, this generator ensures you have the energy needed when you need it most. Designed for durability with a heavy-duty roll cage frame and equipped with never-flat wheels for easy maneuverability, it is perfect for any outdoor adventure. Priced at $399, the SPG3645 is an essential tool for those seeking dependable power on the go.

OPERATOR SAFETY

Safety Rules
Pay attention to this safety alert symbol. Obey all safety l,ll messages that follow this symbol to avoid possible property damage, INJURY, or DEATH. Each safety message Is preceded by a safety alert symbol and one of three words, DANGER, WARNING, or CAUTION.

DANGER
Indicates a hazardous situation that, if not strictly complied with, will result in substantial property damage, serious injury, or DEATH.
WARNING
Indicates a hazardous situation that, if not strictly complied with, may result in property damage, serious injury, or DEATH.
CAUTION
Indicates a hazardous situation that, if not strictly complied with, could result in property damage or injury.
WARNING

READ THIS MANUAL COMPLETELY BEFORE OPERATING.

• DO NOT operate this generator until you have read ALL safety, operation, and maintenance Instructions listed in this manual.
• Failure to follow the instructions may result in property damage, INJURY, or DEATH.
• The warnings and precautions discussed in this manual cannot cover all possible conditions and situations that may occur. It must be understood by the operator that common sense and caution are factors that cannot be built into this product but must be possessed by the operator.

WARNING
This generator is intended for residential consumer use only. Do not modify the engine and do not use the engine for a purpose for which it is not intended.

WARNING

KICKBACK

• Rapid retraction of the starter cord will pull your hand and arm towards the generator faster than you can let go.
• Accidental starts can result in entanglement, traumatic amputation or laceration.
• Broken bones, fractures, bruises or sprains could result.

WARNING

• Before each use, check for loose or damaged parts, signs of oil or fuel leaks, and any other condition that may affect proper operation.
• Repair or replace all damaged or defective parts immediately.
• Locate all operating controls and safety labels.
• Keep all safety guards in place and in proper working order at all times.
• DO NOT allow any material to block the cooling stats.
• DO NOT allow children or untrained persons to operate the generating set.
• DO NOT run the generator unattended. Turn off the generator before leaving the area.

WARNING

FIRE
Operation of this generator may create sparks that can start fires around dry vegetation.
This generator may not be equipped with a spark-arresting muffler. If the generator will be used around flammable materials, or on land covered with materials such as agricultural crops, forest, brush, grass, or other similar items, then an approved spark arrester must be installed.
In some areas, a spark arrester Is required by law. Please contact local fire agencies for laws or regulations relating to fire prevention requirements.
WARNING
Read the instructions provided with the equipment that is powered by this engine for any additional safety rules that should be observed in conjunction with generator startup, shutdown, operation, or protective apparel that may be needed to operate the equipment.

WARNING

HOT SURFACE

• The running generator produces heat. Severe burns can occur on contact.
• DO NOT touch generator while operating or just after stopping. Avoid contact with hot exhaust gases.
• Maintain at least three feet of clearance on all sides to ensure adequate cooling.
• Combustible material can catch fire on contact. Maintain at least five feet of clearance from combustible materials.

DANGER

TOXIC FUMES
The exhaust of the engine contains carbon monoxide, an odorless, colorless, poison gas. Using an engine indoors CAN KILL YOU! NEVER use inside any building or any kind of enclosure, EVEN IF doors and windows are open. Place the generator in a well-ventilated area and carefully consider wind and air currents when positioning the generator.

DANGER

• FIRE OR EXPLOSION
• Gasoline is highly flammable and extremely explosive. Fire or explosion can cause severe burns or death.
• Keep flammable items away while handling gasoline.
• Fill the fuel tank outdoors and in a well-ventilated area with the generator stopped.
• Always wipe off spilled fuel and wait until the fuel has dried before starting the generator.
• DO NOT operate the generator with known leaks in the fuel system.
• Use proper fuel storage and handling procedures. DO NOT store fuel or other flammable materials nearby.
• Empty the fuel tank before storing or transporting this generator.
• Keep fire extinguisher handy and be prepared if a fire starts.

DANGER

• MOVING PARTS
• Moving parts can cause severe injury. Keep hands and feet away.
• NOT operate generator with covers, shrouds, or guards removed.
• DO NOT wear loose-fitting clothing, dangling drawstrings  or items that could become caught. Tie up long hair and remove jewelry.
• NEVER place fingers, hands, or body near the generator when it is running period.

WARNING

ACID

(For types equipped with battery)

• Be careful when using any battery.
• Keep away from open flames, heat or spark.
• Battery will exhaust hydrogen while charging. Only charge a battery in a well ventilated place.
• Avoid spilled battery acid. If contact with skin is made, wash immediately with clean water.

GENERAL HAZARDS

• NEVER operate in an enclosed area, in a vehicle, or Indoors EVEN IF doors and windows are open.
• For safety reasons, the manufacturer recommends that the maintenance of this equipment is carried out by an Authorized Dealer. Inspect the generator regularly, and contact the nearest Authorized Dealer for parts needing repair or replacement.
• Operate generator only on level surfaces and where it will not be exposed to excessive moisture, dirt, dust or corrosive vapors.
• Keep hands, feet. clothing, etc., away from drive belts, fans, and other moving parts. Never remove any fan guard or shield while the unit is operating.
• Certain parts of the generator get extremely hot during operation. Keep clear of the generator until it has cooled to avoid sever burns.
• DO NOT operate generator in the rain.
• DO not alter the construction of the generator or change controls which might create an unsafe operating condition.
• Never start or stop the unit with electrical loads connected to receptacles AND with connected devices turned ON. Start the engine and let it stabilize before connecting electrical loads. Disconnect all electrical loads before shutting down the generator.
• DO NOT insert objects through unit’s cooling slots.
• When working on this equipment when physically or mentally fatigued.
• Never use the generator or any of its parts as a step. Stepping on the unit can stress and break parts, and may result in dangerous operating conditions from leaking exhaust gases, fuel leakage, oil leakage, etc.

NOTE
This generator may be equipped with a spark arrestor muffler. The spark arrestor must be maintained in effective working order by the owner/operator. In the Stare of California, a spark arrestor is required by law (Section 4442 of the California Public Resources Code). Other states may have similar Jaws. Federal Jaws apply on federal lands.

EXHAUST & LOCATION HAZARDS

• NEVER operate in an enclosed area or indoors! NEVER use in the home, in a vehicle, or in partly enclosed areas such as garages, EVEN IF doors and windows are open! ONLY use outdoors and far from open windows, doors, vents, and in an area that will not accumulate deadly exhaust.

DANGER

• Using a generator indoors CAN KILL YOU IN MINUTES.
• Generator exhaust contains carbon monoxide.
• This is a poison you cannot see or smell.
• NEVER use it inside a home or garage, even if doors and windows are open.
• Only use OUTSIDE and far away from windows, doors, and vents.
• The engine exhaust fumes contain carbon monoxide, which you cannot see or smell. This poisonous gas, if breathed in sufficient concentrations, can cause unconsciousness or even death.
• The adequate, unobstructed flow of cooling and ventilating air is critical to correct generator operation. Do not alter the installation or permit even partial blockage of ventilation provisions, as this can seriously affect the safe operation of the generator. The generator MUST be operated outdoors.
• This exhaust system must be properly maintained. Do nothing that might render the exhaust system unsafe or in noncompliance with any local codes and/or standards.
• Always use a battery-operated carbon monoxide alarm indoors, installed according to the manufacturer’s instructions.
• If you start to feel sick, dizzy, or weak after the generator has been running, move to fresh air IMMEDIATELY. See a doctor, as you could have carbon monoxide poisoning.

ELECTRICAL HAZARDS

• The generator produces a dangerously high voltage when in operation. Avoid contact with bare wires, terminals, connections, etc., while the unit is running, even on equipment connected to the generator. Ensure all appropriate covers, guards and barriers are in place before operating the generator.
• Never handle any kind of electrical cord or device while standing in water, while barefoot, or while hands or feet are wet. DANGEROUS ELECTRICAL SHOCK MAY RESULT.
• The National Electric Code (NEC) requires the frame and external electrically conductive parts of the generator to be properly connected to approved earth ground. Local electrical codes may also require proper grounding of the generator. Consult with a local electrician for grounding requirements in the area.
• Use a ground fault circuit interrupter in any damp or highly conductive area (such as metal decking or steelwork).
• Do not use worn, bare, frayed, or otherwise damaged electrical cord set with the generator.
• Before performing any maintenance on the generator, disconnect the engine starting battery (if equipped) to prevent accidental start-up. Disconnect the cable from the battery post indicated by a NEGATIVE, NEG, or (-) first. Reconnect that cable last.
• In case of an accident caused by electric shock, immediately shut down the source of electrical power. If this is not possible, attempt to free the victim from the live conductor. AVOID DIRECT CONTACT WITH THE VICTIM. Use a non-conducting implement, such as a rope or board, to free the victim from the live conductor. If the victim is unconscious, apply first aid and get immediate medical help.

FIRE HAZARDS

• Gasoline is highly FLAMMABLE and its vapors are EXPLOSIVE. Never permit smoking, open flames, sparks or heat in the vicinity while handling gasoline.
• Never add fuel while unit is running or hot. Allow engine to cool completely before adding fuel.
• Never fill fuel tank indoors. Comply with all laws regulating storage and handling of gasoline.
• Do not overfill the fuel tank. Always allow room for fuel expansion. If tank is over-filled, fuel can overflow onto a hot engine and cause FIRE or an EXPLOSION. Never store generator with fuel in tank where gasoline vapors might reach an open flame, spark or pilot light (as on a furnace, water heater or clothes dryer). FIRE or EXPLOSION may result. Allow unit to cool entirely before storage.
• Wipe up any fuel or oil spills immediately. Ensure that no combustible materials are left on or near the generator. Keep the area surrounding the generator clean and free from debris and keep a clearance of five (5) feet on all side to allow for proper ventilation of the generator.
• Do not insert objects through unit’s cooling slots.
• Never operate the generator if connected electrical devices overheat, if electrical output is lost, if engine or generator sparks or if flames or smoke are observed while unit is running.
• Keep a fire extinguisher near the generator at all times.

GETTING STARTED

Unpacking

Remove the generator from the shipping carton

• Place the shipping carton on a solid, flat surface.
• Carefully cut each corner of the carton box from top to bottom. Fold each side flat on the ground.
• Remove everything from the carton except the generator.

Assembly

Your generator requires some assembly. If you have any questions regarding the assembly of your generator.

Install Wheel Kit

Put the axle through the wheel and mount the lug hole, then fix with the clip.

1. Clip
2. Wheel
3. Washer
4. Axle

NOTE
The wheels are not intended for over-the-load use.

Install Support Bracket

Use the supporting bracket bolt to pass through the supporting bracket and the mounting hole on the frame, attach the nut, and tighten until snug.

1. Supporting bracket nut MB
2. Damping seat nut M6
3. Support bracket
4. Damping foot
5. amping foot bolt M6 x18
6. Supporting bracket bolt MB x 16

Battery cable connection (electric start only)
Your generator is not a factory -equipped with a battery. Check local battery dealers to get the correct battery for your generator according to the below specification.

To connect the battery, you will need to connect the battery cables. (see below figure for connection details):

1. Cut off cable ties securing battery cables and remove red covers from battery terminals.
2. First, connect the red cable to the positive(+} battery terminal with the bolt and nut.
3. Make sure connections are secure and slide the rubber boot over the positive(+) battery terminal and connection hardware.
4. Connect the black cable to the negative (-) battery terminal with the bolt and nut supplied and slide the rubber boot over the negative (-} battery terminal and connection hardware.
5. Make sure all connections are secure.

Emission Information
The Environmental Protection Agency (and California Air Resource Board for generators certified to CA standards) requires that this generator comply with exhaust and evaporative emission standards. Locate the emissions compliance decal on the engine to determine what standards the generator meets, and to determine which warranty applies. This generator is certified to operate on gasoline. The emission control system includes the following components (if equipped):

• Air induction System
• Intake Pipe/ Manifold
• Air Cleaner
• Fuel System
• Carburetor
• Fuel Tank / Cap
• Fuel Lines
• Evaporative Vent Lines
• Carbon Canister
• Ignition System
• Spark Plug
• Ignition Module
• Exhaust System
• Exhaust Manifold
• Muffler
• Pulsed Air Valve
• Catalyst

KNOW THE GENERATOR

Read the Owner’s Manual and Safety Rules before operating this generator. Compare the generator to the following figure to become familiarized with the locations of various controls and adjustments. Save this manual for future reference.

1. 120V AC, 20 Amp Duplex Receptacle (5-20R}- Supplies electrical power for the operation of electrical lighting, appliances, tools, and motor loads and is circuit breaker protected against electrical overload.
2. 120V AC, 30 Amp Twist Lock Receptacle (L5-30A)- Supplies electrical power for the operation electrical lighting, appliances, and motor loads and is circuit breaker protected against electrical overload.
3. 120V AC, 30 Amp Receptacle (TT-30R, RV}- Supplies electrical power for the operation of electrical lighting, appliances, and motor loads and is circuit breaker protected against electrical overload.
4. 120/240V AC, 30 Amp Twist Lock Receptacle (L 14-30R}­Supplies electrical power to the operation of electrical lighting, appliances, tool, and motor loads and is circuit breaker protected against electrical overload.
5. 1201240V AC, 50 Amp Receptacle (L 14-50R)- Supplies electrical power for the operation of electrical lighting, appliances, and motor loads and is circuit breaker protected against electrical overload.
6. Circuit Breakers (AC)- Protects the generator and receptacle against electrical overload.SPG3640,SPG3645,SPG5568,SPG7593E,SPG831 OE: 120V Duplex (Each) – 20A
7. Ground Terminal – Used to connect the generator to an approved earth ground.
8. Hour Meter – Tracks generator running hours for regular maintenance and service.
9. Engine Control Switch – Controls the operation of the engine/generator.
10. Main Breakers (AC)- Protects the generator from electrical overload.
    • SPG3640, SPG3645: Main – 29.9A
    • SPG5568: Main – 24.1A
    • SPG7593E: Main – 31A
    • SPG831 OE: Main – 34.SA
11. Circuit Breakers (AC) – Protect the generator and receptacle against electrical overload.
    SPG7593E: L5-30R – 30A
12. Circuit Breakers (AC} – Protects the generator and receptacle against electrical overload.
    SPG831 OE: L 14-SOR – 25A / L 14-30R – 25A

Control panel

Hour meter

Display:
The hour meter tracks hours of operation for scheduled maintenance.

Total running time:

Note:
The hourglass graphic will flash on and off when the engine is running. This signifies that the meter is tracking hours of operation.
DANGER

• Never operate in an enclosed area or indoors! NEVER use in the home, in a vehicle, or in partly enclosed areas such as garages, EVEN IF doors and windows are open! ONLY use outdoors and far from open windows, doors, vents, and in an area that will not accumulate deadly exhaust.
• The engine exhaust fumes contain carbon monoxide, which you cannot see or smell. This poisonous gas, if breathed In sufficient concentrations, can cause unconsciousness or even death.
• The adequate, unobstructed flow of cooling and ventilating air is critical to correct generator operation. Do not alter the installation or permit even partial blockage of ventilation provisions, as this can seriously affect the safe operation
  of the generator. The generator MUST be operated outdoors.
• This exhaust system must be properly maintained. Do nothing that might render the exhaust system unsafe or in noncompliance with any local codes and/or standards.
  Always use a battery-operated carbon monoxide alarm indoors, installed according to the manufacturer’s instructions.

Danger

• Using a generator indoors CAN KILL YOU IN MINUTES. Generator exhaust contains carbon monoxide. This Is a poison you cannot see or smell.
• NEVER use it inside a home or garage, EVEN IF doors and windows are open.
• Only use OUTSIDE and far away from windows, doors, and vents.

Grounding the generator when used as a portable
This generator has an equipment ground that connects the generator frame components to the ground terminals on the AC output receptacles (see NEC 250.34 (A) for an explanation). This allows the generator to be used as a portable without grounding the frame of the generator as specified in NEC 250.34.
Special Requirements
There may be Federal or State Occupational Safety and Health Administration (OSHA) regulations, local codes, or ordinances that apply to the intended use of the generator.
Please consult a qualified electrician, electrical inspector, or the local agency having jurisdiction:

• In some areas, generators are required to be registered with local utility companies.
• If the generator is used at a construction site, there may be additional regulations that must be observed.
  Connecting the generator to a building’s electrical system
  When connecting directly to a building’s electrical system, it is recommended that a manual transfer switch is used. Connections for a portable generator to a building’s electrical system must be made by a qualified electrician and in strict compliance with all national and local electrical codes and laws.

WATTAGE REFERENCE GUIDE

• Device . . . . . . . . . . . . . . . . . . . . . . . . . . ,………….. Running Watts
• Air Conditioner (12,000 Btu)………………………………………… 1700
• Air Conditioner (24,000 Btu).……………………………………….. 3800
• Air Conditioner (40,000 Btu).………………………………………. 6000
• Battery Charger (20 Amp)..……………………………………………. 500
• Belt Sander (3″)..………………………………………………………… 1000
• Chain Saw.…………………………………………………………………. 1200
• Circular Saw (6-1/2″)..……………………………………….. 800 to 1000
• Clothes Dryer (Electric)………………………………………………. 5750
• Clothes Dryer (Gas)…………………………………………………….. 700
• Clothes Washer…………………………………………………………. 1150
• Coffee Maker..…………………………………………………………….. 1750
• Compressor (1 HP)………………………………………………………………………………….. 2000
• Compressor(3/4 HP)…………………………………………………… 1800
• Compressor (1/2 HP).…………………………………………………. 1400
• Curling Iron………………………………………………………………….. 700
• Dehumidifier..……………………………………………………………… 650
• Disc Sander (9″)………………………………………………………….. 1200
• Edge Trimmer……………………………………………………………….. 500
• Electric Blanket……………………………………………………………. 400
• Electric Nail Gun………………………………………………………….. 1200
• Electric Range (per element)……………………………………….. 1500
• Electric Skillet…………………………………………………………….. 1250
• Freezer………………………………………………………………………… 700
• Furnace Fan (3/5 HP)……………………………………………………. 875
• Garage Door Opener.……………………………………… 500 to 750
• Hair Dryer…………………………………………………………………… 1200
• Hand Drill.………………………………………………………. 250 to 1100
• HedgeTrimmer..……………………………………………………………. 450
• Impact Wrench…………………………………………………………….. 500
• Iron……………………………………………………………………………. 1200
• Jet Pump……………………………………………………………………. 800
• Lawn Mower……………………………………………………………….. 1200
• Light Bulb.…………………………………………………………………….. 100
• Microwave Oven. . . . . . . . . . . . . . . . . . . . .•…………. 700 to 1000
• Milk Cooler………………………………………………………………… 1100
• Oil Burner on Furnace…………………………………………………… 300
• Oil Fired Space Heater (140,000 Btu).……………………………. 400
• Oil Fired Space Heater (85,000 Btu)……………………………….. 225
• Oil Fired Space Heater (30,000 Bt u)………………………………. 150
• Paint Sprayer, Airless (1/3HP).…………………………………….. 600
• Paint Sprayer, Airless (handheld).…………………………………. 150
• Radio………………………………………………………………….. 50 to 200
• Refrigerator..……………………………………………………………….. 700
• Slow Cooker . . . . . . . . . . . . . . . . . . . . . . . . . ,……………………. 200
• Submersible Pump (1-1/2 HP)……………………………………… 2800
• Submersible Pump (1 HP)..…………………………………………… 2000
• Submersible Pump (1/2 HP)…………………………………………. 1500
• Sump Pump..…………………………………………………… 800 to 1050
• Table Saw (10″).………………………………………………………………………. 1750 to 2000
• Television.………………………………………………………… 200 to 500
• Toaster…….……………………………………………………. 1000 to 1650
• Weed Trimmer………………………………………………………………. 500
• Allow 3 times the listed watts for starting these devices

FEATURES AND CONTROLS

1. Fuel tank
2. Level indicator
3. Fuel tank cap
4. Handle
5. Frame
6. Cylinder head
7. Muffler guard
8. Wheel
9. Air filter
10. Recoil Starter
11. Support bracket
12. Handle stop pin
13. Battery
14. Control panel
15. Engine switch

Description

The FNA Group Simpson PowerShot Generators SPG3645 is built with a sturdy steel frame and features a durable powder-coated finish to withstand harsh environments. The generator has a fuel capacity of 4 gallons, providing up to 10 hours of runtime at half load. It includes several safety features such as automatic low-oil shutdown, overload protection, and GFCI-protected outlets to ensure safe operation.

The SPG3640 also comes with a wheel kit and handle for easy mobility, making it an ideal choice for camping trips, RV use, or job sites. The generator's noise level is relatively low at 72 dB, allowing for quiet operation in residential areas.

OPERATING

Operating Checklist Operating Location

• Only use OUTSIDE and place the generator in a well-ventilated area and carefully consider wind and air currents.
• Place the generating set on a level surface before any operation.
• Allow two feet of clearance on all sides of the generator while operating.

DANGER

TOXIC FUMES

• The exhaust of the generator contains carbon monoxide, an odorless, colorless, poison gas. Using the generator indoors CAN KILL YOU!
• NEVER use inside any building or any kind of enclosure, EVEN IF doors and windows are open.
• Place the generator in a well-ventilated area and carefully consider wind and air currents when positioning the generator.

High Altitude
This engine will have proper engine performance and emission control when it is operated at or below an altitude of 5000 feet (1524 meters). This engine requires a high-altitude carburetor kit to ensure proper engine performance and emission control when it is operated at altitudes above 5000 feet (1524 meters). Operating the engine with the wrong engine configuration above 5000 feet (1524 meters) may increase its emissions and decrease fuel efficiency and performance. 

CAUTION

Operation of the engine with a high-altitude carburetor k.it at an altitude below 5000 feet (1524 meters) may cause the engine to overheat and result in serious engine damage.

Operating Condition

• Check for loose or damaged parts, signs of oil or fuel leaks, and any other condition that may affect proper operation.
• Repair or replace all damaged or defective parts immediately.

WARNING

Failing to correct the problem(s) before the operation could result in property damage, serious injury, or DEATH.

• Remove any excessive dirt or debris, especially around the muffler and recoil starter.
• DO NOT move or tip the generator during operation.
• Use the generator only for intended uses.

Engine oil

• Place the generator on a level surface with it stopped.

• Remove the dipstick and wipe it clean.

  

Remove dipstick

• Reinstall dipstick into tube; rest on oil fill neck, DO NOT thread cap into the tube.

• Remove the dipstick again and check the oil level. The level should be at top of the indicator on the dipstick.

  

• Fill the upper limit of the dipstick with the recommended oil if the oil level is low.
• Reinstall and fully tighten the dipstick.
• Engine damage could result from insufficient lubrication. Refer to add oil instruction in the MAINTENANCE section for more information.
• See SPECIFICATIONS for oil capacity (rated).

WARNING

This engine is not filled with oil at the factory. Any attempt to crank or start the engine before it has been properly filled with the recommended type and amount of oil may result In engine damage and void your warranty.

WARNING

• Oil is a major factor affecting performance and service life.
• Use 4-stroke automotive detergent oil recommended in the MAINTENANCE section of this manual.

WARNING

• Operate generator only on level surfaces. The low oil sensor
• (If equipped) will automatically stop the engine when the oil level falls below the safe limit. To avoid the inconvenient of an unexpected shutdown, fill to the upper limit and check the oil I evel regularly.

Engine fuel

• With the engine stopped, check the fuel level gauge. Refill the fuel tank if necessary.

CAUTION

• Pressure can build up in the fuel tank. Allow the engine to cool for at least two minutes before removing the fuel cap.
• Loosen the fuel cap slowly to relieve any pressure in the tank.
• Use clean, fresh regular unleaded gasoline with a minimum octane rating of 87. DO NOT mix oil with gasoline or use gasoline older than 30 days. DO NOT use gasoline that contains more than 10% ethyl alcohol. E15, E20, and E85 have NOT approved fuels and should NOT be used.
• Be sure not to fill the fuel tank above the upper limit mark. Always allow room for fuel expansion.

• See SPECIFICATIONS for fuel capacity (rated). that

  

IMPORTANT: helps eliminate Ethanol and Shield™ prevent (sold ethanol separately) related problems fuel in stabilizer power the equipment. gasoline. Follow the instructions on the container and add to

NOTICE: Use of fuels with greater than ethanol is not approved for use if} this product per EPA regulations and will damage the unit and void the warranty.

WARNING

Do not fill the fuel tank above the maximum fuel level. Over fill will result in engine die or damage the carbon canister (if equipped) and void your warranty.

DANGER

FIRE OR EXPLOSION

• Gasoline is highly flammable and extremely explosive.
• Fire or explosion can cause severe bums or death.
• Keep flammable Items away while handling gasoline.
• Fill fuel tank outdoors and in a well-ventilated area with the engine stopped.
• Always wipe off spilled fuel and wait until the fuel has dried before starting the engine.
• DO NOT operate the engine with known leaks in the fuel system.
• Use proper fuel storage and handling procedures. DO NOT store fuel or other flammable materials nearby.
• Empty the fuel tank before storing or transporting this engine. Keep fire extinguisher handy and be prepared if a fire starts.
• NEVER use engine or carburetor cleaner products In the fuel tank or permanent damage may occur.
• It is important to prevent gum deposits from forming in essential fuel system parts, such as the carburetor, fuel filter, fuel hose or tank during storage. Also, experience indicates that
• alcohol-blended fuels (called gasohol, ethanol or methanol) can attract moisture, which leads to separation and formation of acids during storage.
• Acidic fuel can damage the fuel system of an engine while in storage. Be sure to review the instructions given in “Storage” section.
• Gasoline/Alcohol Blends: up to 10% alcohol, 90% unleaded gasoline by volume is approved as a fuel. Other gasoline/alcohol blends are not approved. Effects of old, stale are not warrantable. or contaminated fuel

CAUTION

To minimize gum deposits in your fuel system and to insure easy starting, do not use gasoline left over from the previous season.

CAUTION

Pressure can build up in the fuel tank. Allow the generator to cool for at least two minutes before removing fuel cap. Loosen the fuel cap slowly to relieve any pressure in the tank.

Electrical devices

• Disconnect all electrical devices from the generator and swrtch off the circuit breaker before start the engine.
• The generator may be hard to start with electrical devices.

Grounding

• The generator must be properly connected to an appropriate ground. It helps prevent electrical shock if a ground fault condition exists in the generator or ln connected electrical devices, especially wrth a wheel kit. Proper grounding also helps dissipate static electricity, which often builds up in ungrounded devices.

DANGER

Electric Shock
Failure to properly ground the generator can result in electric shock.

• A ground terminal on the frame of the generator has been provided on the generator end. For remote grounding, connect of a length of heavy gauge (4mm2) copper wire between the generator ground terminal and a copper rod driven Into the ground.
• The National Electrical Code requires that the frame and external electrically conductive parts of this generator be properly connected to an approved earth ground. Local
• electrical codes may also require proper grounding of the unit. We strongly recommend that you consult with a qualified electrician for grounding requirements in your area.

Starting the engine

1. Perform OPERATING CHECKLIST (Page 9).

2. Turn the fuel valve to the “ON” position.

   

3. Turn off the AC breaker protector. (If it is not equipped with an AC breaker protector, please remove all loads or electrical devices)

4. Pull the choke valve switch to the “CLOSE” position.

   

CAUTION

The choke position for starting may vary depending on temperature and other factors. If re-starting a wann engine, the choke should be left in the HALF or CLOSE position.

1. Electric start: Turn and keep the key in the “START’ position till the engine is started. After the engine is started, release the key to return to the “ON” position.

   

Manual start: Turn the switch to the “ON” position and then seize the starter handle and slowly pull until there is a sense of resistance felt, and quickly pull to start.

WARNING

• KICKBACK
• Rapid retraction of the starter cord will pull your hand and arm towards the engine faster than you can let go.
• Accidental starts can result in entanglement, traumatic amputation, or laceration.
• Broken bones, fractures, bruises, or sprains could result.
• If the starter fails to start the engine, immediately tum off the starter. Don’t attempt to restart the engine before the failure cause is identified. Don’t restart the engine by replacement of another storage battery without authorization.

CAUTION

If the engine fails to start after attempt for 3 times or flames out after starting, inspect and ensure that the generator is placed in horizontal surface and enough engine oil is included.

During starting, don’t keep the starting switch to “start” position for more than 5 seconds, otherwise it is possible to damage the starter motor. If the unit fails to start within first time, restart after about 10 seconds. After the unrt is used for a period, if the starting speed of the motor falls, please replace the storage battery. 

During the operation of the unit, the storage battery supplies power for the solenoid valve of the carburetor. For this, when the unit is turned off, make sure that the starting switch is in ” OFF” position and otherwise the storage battery voltage is reduced due to the operating solenoid valve of the carburetor, impacting on starting for next time.

If the engine is equipped with an engine oil alarm, it is possible to prevent engine start when the engine oil in the crankcase is lower than minimum level. During running-in, routinely inspect the engine oil. See Maintenance section for recommended maintenance period.

1. After the engine is running, move the choke valve to “OPEN” position.

   

WARNING

Connect the output terminal of the generating set with the electrical equipment. Don’t start or stop the engine when the electrical equipment is in ”ON” status.

Connect to electrical devices
Inspect the power cord for damage before using it. There is a hazard of electric shock from crushing, cutting, or heat damage.

DANGER

• Electric Shock
• To reduce the risk of electrical shock, DO NOT use electrical cords that are worn, frayed, bare, or otherwise damaged.
• DO NOT touch bare wires of receptacles.
• DO NOT handle generating set or electrical cords while standing in water, while barefoot, or while hands or feet are wet.
• Allow the engine to stabilize and warm up for a few minutes after starting.
• Make sure the electrical devices are in the “OFF” position and the load current is not higher than the maximum capacity current of a single socket.

CAUTION
If the current of single load is higher than the maximum capacity current of single socket, please disconnect the load.

CAUTION
If connected devices overheat, turn them off and disconnect them from generator.

Bearing capacity

WARNING:

• DO NOT overload the generating set.
• Exceeding the capacity of generator can damage the generator and/or electrical devices connected to it.
• You must make sure your generator can supply enough rated (running) and surge (starting) watts for the electrical devices you will power at the same time. Follow these simple steps to calculate the running and starting watts necessary for your purposes.

1. Select the electrical devices you will power at the same time.
2. The amount of power you need to run all the devices is the total rated (running) watts of these items.
3.  Identify how may surge (starting) watts you will need. Surge wattage is the short burst of power needed to start electric motor-driven tools or appliances such as a circular saw or refrigerator.

• Because not all motors start at the same time, total surge watts can be estimated by adding only the electrical device(s) with the highest additional surge watts to the total rated watts from step 2.

WARNING
You must isolate the generator from the electric utility by opening the electrical system’s main circuit breaker or main switch if the generator is used for backup power. Failure to isolate the generator from the power utility may result in injury or death to electric utility workers and damage to the generator due to back feed of electrical energy.
WARNING
Storage batteries give off explosive hydrogen gas while recharging. An explosive mixture will remain around the battery for a long time after it has been charged. The slightest spark can ignite the hydrogen and cause an explosion, resulting in blindness or another serious injury.
WARNING
DO NOT allow smoking, open flame, sparks or any other source of heat around a battery. Wear protective goggles, rubber apron and rubber gloves when working around a battery. Battery electrolyte fluid is an extremely caustic sulfuric acid solution that can cause severe burns. If spill occurs flush area with clear water immediately.

To recharge volt batteries, proceed as follows:

• Check fluid level in all battery cells. If necessary, add ONLY distilled water to cover separators in battery cells.
• DO NOT use tap water.
• If the battery is equipped with vent caps, make sure they are installed and are tight.
• If necessary, clean battery terminals.
• Connect the battery charge cable clamp with a red handle to the positive{+) battery terminal.
• Connect the battery charge cable clamp with the black handle to the negative {-) battery terminal.
• Start engine. Let the engine run while the battery recharges.
• When a battery has charged, shut down the engine.

CAUTION
Use an automotive hydrometer to test battery state of recharge and condition. Follow the hydrometer manufacturer’s instructions carefully. Generally, a battery is considered to be at 100% state of charge when specific gravity of its fluid (as measured by hydrometer) is 1.260 or higher.

Stopping the engine

1. Remove all loads on generator.

2. Remove the plug of all electric equipment from the generator panel.

   

WARNING

NEVER stop the engine with electrical devices connected and with the connected devices turned “ON”.

1. Allow the generator to run at no load for a few minutes to stabilize the internal temperatures of the engine and generator.

2. Turn the key to the “OFF” position.

   

3. Turn the fuel valve to the “OFF” position.

   

Setup Guide

To set up the FNA Group Simpson PowerShot Generators SPG3645, start by ensuring the generator is placed on a level surface away from flammable materials. Follow these steps:

• Unpack the generator and all included accessories.
• Attach the wheel kit if not already installed.
• Fill the fuel tank with the recommended type of gasoline.
• Check the oil level and fill if necessary.
• Connect any appliances or equipment to the appropriate outlets.
• Use the electric start button to turn on the generator.

MAINTENANCE

A repair shop or person of the owner’s choosing may maintain, replace or repair emission control devices and systems; however, warranty replacements or repairs must be performed by an FNA distribution or service center. 

It is the owner’s/operator’s responsibility to complete all scheduled maintenance in a timely manner. Correct any issues before operating the engine. Always follow the Inspection and maintenance recommendations and schedules in this manual. Before servicing the generator, stop the generator, disconnect all electrical devices and battery(if equipped) and allow the generator to cool down.

WARNING

Improper maintenance or failure to correct a problem before operation can cause a malfunction and result in property damage, serious injury or DEATH. Improper maintenance may void your warranty.

DANGER

Accidental starts can cause severe injury or death. Remove and ground spark plug wire before performing any service.

CAUTION

The filter element may contain polyaromatic hydrocarbons (PAHs). PAHs are harmful to your health. Please wear gloves for protection during air filter maintenance.

Maintenance Schedule

Follow the service intervals indicated in the chart below. Your generating set may need to be serviced more frequently when operating in adverse conditions, such as excessive dust or airborne debris, high moisture, high vibrations, or intense heat or sunlight.

Generator maintenance

• Make certain that the generator is kept clean and stored properly.
• Use a damp cloth to clean exterior surfaces of the generator.
• Use an air compressor (25 PSI) to clear dirt and debris from the generator.
• Inspect all air vents and cooling slots to ensure that they are clean and unobstructed.

WARNING

DO NOT use water to clean the generator. Water can enter the generator through the cooling slots and damage the generator windings.

WARNING

DO NOT modify the generator in any way.  DO NOT tamper with governed speed. Generating set supplies with correct rated frequency and voltage when running at the factory. Tampering with the factory set governor will void your warranty.

Engine maintenance

Engine Oil
SAE 1 0W-30 is recommended for general, all-temperature use. Other viscosities shown in the chart may be used when the average temperature in your area is within the indicated range.

AMBIENT TEMPERATURE

See SPECIFICATIONS for oil capacity (rated) Add Oil

1. Place the engine on a level surface.

2. Remove the dipstick and wipe it clean.

   

Remove dipstick

1. Add recommended oil to the upper limit.

   

2. Fully tighten the dipstick.
3. Properly dispose of any used oil at an approved waste management facility.

Change Oil

CAUTION

Change the oil when the engine is warm from operation.

1. Place the engine on a level surface.
2. Clean the area around the dipstick and drain plug.
3. Remove the oil dipstick.
4. Remove the oil drain plug and allow the oil to drain completely.
5. Reinstall and fully tighten the drain plug.
6. Add recommended oil to the upper limit (see add OIL instruction above). Reinstall and fully tighten the dipstick.
7. Dispose of used oil at an approved waste management facility.

WARNING

The engine is not filled with oil at the factory. Any operation before it has been properly filled with the recommended type and amount of oil may result in engine damage and void your warranty.

Air Filter

1. Loosen the filter fix clamp and remove the cover of the air filter.

   

2. Filter fix clamp
3. Air filter cover
4. Foam filter element
5. Air filter body
6. Remove the foam filter element.
7. Wash in liquid detergent and warm water.
8. Squeeze thoroughly dry with a clean cloth.
9. Saturate in clean engine oil.
10. Squeeze in a clean, absorbent cloth to remove all excess oil.
11. Place the filter in the assembly.
12. Fasten the air filter cover with the fixed clamp, and then mount it back to the air filter body.

WARNING
DO NOT run the engine without the air filter. Serious damage to the engine can result without the air filter.

Spark Plug

1. Clean any dirt from the spark plug cap and spark plug base.
2. Remove the spark plug cap.
3. Use a socket wrench to loosen and remove the spark plug.
4. Inspect the spark plug and spark plug washer. If they are damaged or worn, replace them with new ones. Clean the spark plug with a wire brush if it can be reused.

5. Check the spark plug gap. Carefully bend the side electrode to adjust the gap if necessary. Spark plug gap: 0.6mm – 0.8mm

   

   
   Check the spark plug gap

6. Carefully thread the plug into the engine by hand.
7. After the spark plug is seated, use a spark plug wrench to tighten the plug. Spark Plug Torque: 15-20N.m
8. Attach the spark plug cap to the plug.

WARNING

Only use recommended spark plug or equivalent. DO NOT use spark plugs that have improper heat range.

Spark Arrester (Applicable types)

1. Allow the engine to cool completely before servicing the spark arrester.
2. Remove the two screws holding the cover plate which retains the end of the spark arrester to the muffler.
3. Remove the spark arrester screen.
4. Carefully remove the carbon deposits from the spark arrester screen with a wire brush.
5. Replace the spark arrester if it is damaged.

6. Reinstall the spark arrester in the muffler and attach it with the two screws.

   

Idle Speed
The idle speed has been pre-set at the factory and should rarely require readjustment.

WARNING
Improper adjustment of idle speed will damage your engine and void your warranty

Adjustment
Except as described in this Manual, there is no additional maintenance or adjustment required for your engine.
Improper adjustments or tampering can damage your engine and your equipment and will void your warranty.

WARNING

Tampering with the factory set governor will damage your engine and void your warranty.

DANGER

• DE ADLY EXHAUST FUMES! ONLY use OUTSIDE far away from windows, doors, and vents!
• NOT INTENDED FOR USE IN CRITICAL LIFE  SUPPORT APPLICATIONS.
• SAVE this Manual. Provide this manual to any operator of the generator.

WARNING

This product and its exhaust can expose you to chemicals including lead and lead compounds, and carbon monoxide, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to https://www.p65warnings.ca.gov/

This Manual contains important safety information and instructions for operating this generating set. PLEASE READ THIS MANUAL CAREFULLY. 

Failure to do so could result in property damage and/or personal INJURY/DEATH. Provide this manual to any operator of this generator. This manual should be considered as a permanent part of your generator and should remain with it when you sell it. The pictures and figures in the manual shall be only for reference. There may be differences between the pictures and figures and the physical product.

Trouble Analysis & Troubleshooting

Storage & Transportation

Storage
The generator should be started at least once every two weeks and allowed to run for at least 20 minutes. Follow the instructions below for longer-term storage if the generating set will be out of service for 2 months or more.

DANGER

FIRE OR EXPLOSION

Gasoline is highly flammable and extremely explosive.
Empty the fuel tank before storing or transporting the generator.

1. Allow the generator to cool completely before storage.
2. Clean the generator according to the instructions in the instructions in the Maintenance section.
3. Drain all fuel completely from the fuel hose and carburetor to prevent gum from forming.
4. Tum off the fuel supply at the fuel valve.
5. Change the oil.
6. Reattach the spark plug.
7. Remove the spark plug and pour about 15ml of oil into the cylinder. Crank the engine slowly to distribute the oil and lubricate the cylinder.
8. Store the unit In a clean, dry area out of direct sunlight.

Transportation
To prevent fuel spillage when transporting or during temporary storage, the generating set should be secured upright in Its normal operating position, with the engine switch OFF. The fuel valve lever should be turned OFF.

WARNING

When transporting:

• DO NOT overfill the tank.
• DO NOT operate the generator while it is in the vehicle. Take the generator off the vehicle and use it in a well-ventilated place. Avoid a place exposed to direct sunlight when putting the generator on a vehicle. If the generator is left in an enclosed vehicle for many hours, high temperatures inside the vehicle could cause fuel to vaporize resulting In a possible explosion.
• DO NOT drive on a rough road for an extended period with the generator on board. If you must transport the generator on a rough road, drain the fuel from the generator beforehand.

Warranty

FNA Group warrants to the original retail purchaser that this SIMPSON brand outdoor product is free from defects in material and workmanship and agrees to repair or replace, at FNA Group’s, discretion, any defective product free of charge within these time periods from the date of purchase. Three years if the product is used for personal, family, or household use; 6 months, if used for any other purpose, such as commercial or rental. This warranty extends to the original retail purchaser only and commences on the date of the original retail purchase. 

Pros & Cons

Pros:

• High power output of 3600 watts.
• Durable construction with a steel frame and powder-coated finish.
• Multiple outlets for versatility.
• Electric start system for easy ignition.
• Long runtime of up to 10 hours at half load.
• Quiet operation at 72 dB.

Cons:

• Slightly heavier due to the robust build.
• Noisy during startup and under heavy load.
• Higher fuel consumption compared to smaller generators.
• Requires regular maintenance to ensure optimal performance.

Customer Reviews

Customers have generally praised the FNA Group Simpson PowerShot Generators SPG3645 for its reliability and power output. Many have noted its ease of setup and operation, as well as its ability to handle heavy loads without issues. However, some users have mentioned that it can be noisy during startup and under heavy load, and that it consumes more fuel than expected.

Common complaints include the need for frequent oil checks and the weight of the generator, which can make it less portable for some users.