Generac 5500 Generator Manual: A Comprehensive Guide
This detailed manual unlocks the full potential of your Generac 5500, offering guidance for safe operation, maintenance, and troubleshooting for optimal performance.
The Generac 5500 is a powerful and reliable portable generator designed to provide convenient power during outages or when off-grid. This manual serves as your comprehensive guide to understanding and utilizing all the features of your new generator.
Whether you’re preparing for emergencies, powering recreational activities, or tackling job site demands, the Generac 5500 offers a versatile solution. This guide details everything from initial setup and safe operation to routine maintenance and troubleshooting common issues.
Explore the possibilities and ensure years of dependable service by carefully reviewing the information contained within this manual. Welcome to the world of portable power!
Understanding the Generator’s Features
The Generac 5500 boasts a robust OHV engine delivering 5500 starting watts and 4000 running watts, providing ample power for essential appliances and tools. It features multiple outlets, including 120V and 240V receptacles, offering versatility for various power needs.
Its compact and portable design, coupled with durable wheels and a handle, ensures easy maneuverability. The generator incorporates a low-oil shutdown feature, protecting the engine from damage, and a fuel gauge for convenient monitoring.
Electric start functionality simplifies operation, while the recoil start provides a backup option. Understanding these features will maximize your generator’s performance and longevity.

Safety Precautions
Prioritize safety! This section details crucial guidelines regarding carbon monoxide, electrical hazards, and proper fuel handling for your Generac 5500’s safe operation.
Carbon Monoxide Hazards
WARNING: Carbon monoxide (CO) is a colorless, odorless gas produced during the combustion process of fuel. Operating a Generac 5500 generator indoors or in partially enclosed spaces can create a dangerous buildup of CO, leading to serious illness or even death.
Never operate the generator inside a home, garage, shed, or any enclosed area, even with ventilation. Always position the generator outdoors in a well-ventilated location, at least 20 feet away from windows, doors, and vents. Install battery-operated or plug-in CO alarms in your home, especially near sleeping areas.
Be aware of the symptoms of CO poisoning, which include headache, dizziness, weakness, nausea, vomiting, chest pain, and confusion. If you experience any of these symptoms, immediately move to fresh air and seek medical attention. Regularly inspect the generator for exhaust leaks and ensure proper ventilation is maintained during operation. Your safety is paramount!
Electrical Safety Guidelines
CAUTION: Improper electrical connections can lead to electric shock or damage to your generator and connected appliances. Always adhere to these safety guidelines when operating your Generac 5500.
Before connecting any appliances, ensure they are in good working order and have a three-prong grounding plug. Never overload the generator by exceeding its wattage capacity. Use heavy-duty, outdoor-rated extension cords of the correct gauge for the distance and load. Inspect cords for damage before each use.
Avoid operating the generator in wet conditions. If rain or snow is anticipated, protect the generator with a suitable cover. Never attempt to modify the generator’s wiring or grounding system. If you are unsure about any electrical connection, consult a qualified electrician. Prioritize safety to prevent hazards!
Fuel Handling and Storage
WARNING: Gasoline is highly flammable. Exercise extreme caution when handling and storing fuel for your Generac 5500. Always shut down the generator and allow it to cool completely before refueling. Refuel outdoors in a well-ventilated area, away from open flames or sparks.
Use a funnel to prevent spills and avoid overfilling the fuel tank. Store gasoline in an approved, tightly sealed container, clearly labeled, and kept in a cool, dry, and well-ventilated location, away from living areas.
Never store fuel near the generator or any heat source. Follow all local and national regulations regarding fuel storage. Dispose of old or contaminated fuel properly; do not pour it down drains or onto the ground. Safe fuel practices are crucial for preventing fires and ensuring safe operation.

Setting Up Your Generac 5500
Proper setup is key for reliable power. This section details unboxing, fluid checks, and battery connection, preparing your Generac 5500 for operation.

Unboxing and Inspection
Carefully remove your Generac 5500 from the shipping crate, ensuring you have ample space to work; Inspect the generator thoroughly for any visible signs of damage incurred during transit. This includes checking the frame, control panel, outlets, and fuel tank. Document any damage with photographs immediately and contact your retailer or Generac customer support.
Verify that all included accessories are present. These typically include the owner’s manual, a spark plug wrench, an oil funnel, and potentially a battery charger. Compare the contents against the parts list in the manual. Retain the packaging materials for potential returns or warranty claims. Before proceeding, ensure the generator is placed on a stable, level surface in a well-ventilated area.
Oil Filling Procedure

Before initial startup, and during routine maintenance, proper oil filling is crucial for your Generac 5500’s longevity. Consult your owner’s manual for the correct oil type and capacity – typically 10W-30 is recommended. Locate the oil fill cap, usually marked with an oil can symbol. Remove the cap and, using a funnel, slowly pour in the specified amount of oil.
Avoid overfilling, as this can cause engine damage. Check the oil level using the dipstick, wiping it clean before reinserting for an accurate reading. The oil level should fall between the “Min” and “Max” marks. Securely tighten the oil fill cap after verifying the level. Regularly check the oil level before each use, adding more as needed to maintain optimal engine performance and protection.
Connecting the Battery
To connect the battery to your Generac 5500, first ensure the generator is switched off. Locate the battery compartment, typically with designated positive (+) and negative (-) terminals. Carefully connect the red cable to the positive terminal and the black cable to the negative terminal, ensuring a secure connection.
Tighten the terminal clamps to prevent loosening during operation. Double-check the polarity – reversing the connections can cause severe damage. Once connected, inspect the battery cables for any signs of wear or damage, replacing them if necessary. A fully charged battery is essential for reliable electric starting, so maintain proper battery health for consistent performance.

Starting and Operating the Generator
Proper startup and operation ensure reliable power. Always follow the pre-start checklist and utilize either the electric or recoil start methods safely.
Pre-Start Checklist
Before initiating the start-up sequence for your Generac 5500, a thorough pre-start checklist is crucial for ensuring safe and efficient operation. First, verify the oil level, adding if necessary to maintain optimal lubrication. Next, inspect the fuel level, ensuring an adequate supply for your intended runtime, and check for any fuel leaks around the tank and lines.
Confirm the battery is securely connected and fully charged, especially if relying on the electric start function. Examine the air filter for cleanliness; a clogged filter restricts airflow and reduces performance. Finally, ensure the generator is positioned on a stable, level surface in a well-ventilated outdoor area, away from flammable materials. Double-check all connections and safety features before proceeding.
Starting the Generator (Electric Start)
Utilizing the electric start feature on your Generac 5500 offers convenient ignition. Begin by ensuring the generator is in the “OFF” position. Turn the key to the “ON” position, allowing the system to prime. Then, depress and hold the start button; the engine should engage within a few seconds. If it doesn’t start immediately, release the button and repeat the process, avoiding prolonged cranking to prevent battery drain.
Once running, allow the generator to stabilize for a minute before connecting any loads. Monitor the voltage and frequency readings on the control panel to confirm proper operation. Should the generator fail to start after several attempts, consult the troubleshooting section of this manual for further assistance, or consider using the recoil start method.
Starting the Generator (Recoil Start)
For recoil starting your Generac 5500, first ensure the fuel valve is open and the engine switch is set to “ON”. Slowly pull the recoil starter handle until you feel resistance, indicating the compression stroke. Then, with a firm, steady pull, continue to draw the handle outwards to initiate engine rotation. Avoid letting the handle snap back; control its return to prevent damage.
If the engine doesn’t start on the first pull, repeat the process. After a successful start, gradually allow the handle to rewind. Let the generator run for a minute to stabilize before connecting any appliances. If repeated attempts fail, check fuel levels and the spark plug, referencing the troubleshooting guide for further support.

Understanding the Control Panel
The Generac 5500’s control panel houses vital outlets and indicators, providing essential operational insights and enabling safe, efficient power distribution for your needs.
Outlet Descriptions (120V, 240V)
Your Generac 5500 generator is equipped with multiple outlets to accommodate a variety of power needs. The 120V outlets, typically NEMA 5-15R and 5-20R receptacles, are standard for powering most household appliances and tools – lights, televisions, and smaller power tools fall into this category. These outlets are ideal for everyday use and offer convenient access to electricity during outages.
The 240V outlet, usually a NEMA 6-20R, provides higher voltage for appliances requiring significant power, such as welders, large air conditioners, or electric stoves. Always verify the voltage and amperage requirements of your appliances before connecting them to ensure compatibility and prevent damage. Using the incorrect outlet can lead to malfunction or safety hazards. Proper outlet selection is crucial for optimal generator performance and appliance longevity.
Power Indicator Lights
The Generac 5500’s control panel features several indicator lights providing crucial operational status at a glance. The ‘Power’ light illuminates when the generator is running, confirming successful engine operation and power generation. A ‘Low Oil’ light signals insufficient oil levels, triggering an automatic shutdown to protect the engine from damage – always address this immediately by adding oil.
The ‘Overload’ light indicates the generator is supplying more power than its rated capacity; disconnect some appliances to resolve this. A separate light may indicate a fault condition, requiring troubleshooting. Regularly checking these lights during operation ensures you’re aware of any potential issues, allowing for prompt corrective action and maximizing the generator’s lifespan and reliability.
Low Oil Shutdown Indicator
The Low Oil Shutdown Indicator is a critical safety feature on your Generac 5500. This light illuminates on the control panel when the engine oil level drops below a safe operating threshold. Upon illumination, the system automatically shuts down the engine to prevent catastrophic damage from oil starvation. Never attempt to bypass this safety mechanism.
Before restarting after a low oil shutdown, thoroughly check the oil level using the dipstick and add oil of the correct type and viscosity as specified in the manual. Ignoring this warning and continuing to operate the generator can lead to severe engine damage, voiding your warranty. Regular oil level checks are paramount for reliable operation.

Maintenance Schedule
Consistent upkeep ensures peak performance and longevity of your Generac 5500. Follow the recommended schedule for oil changes, filter cleaning, and spark plug checks.
Oil Change Procedure
Regular oil changes are crucial for maintaining the health of your Generac 5500 engine. Begin by warming the engine for a few minutes to ensure the oil flows freely. Locate the oil drain plug, typically positioned on the lower part of the engine. Place a suitable oil drain pan beneath the plug to catch the used oil.
Carefully remove the drain plug, allowing the oil to completely drain. Once drained, reinstall the plug, ensuring it’s securely tightened. Next, remove the oil fill cap and add the recommended amount of oil, specified in your manual – usually around 1.1 quarts of 10W-30 oil.
Use a funnel to prevent spills. Check the oil level with the dipstick, adding more if needed to reach the ‘full’ mark. Properly dispose of the used oil at a designated recycling center.
Air Filter Cleaning/Replacement
Maintaining a clean air filter is vital for optimal engine performance. Locate the air filter housing, usually a plastic cover on the side of the generator. Disconnect any clips or screws securing the cover and carefully remove it. Take out the air filter – it may be foam or paper.
If it’s a foam filter, wash it gently with warm, soapy water, rinse thoroughly, and allow it to dry completely before lightly oiling it. For a paper filter, gently tap it to remove loose debris; avoid using compressed air, as it can damage the filter;
If the filter is excessively dirty or damaged, replace it with a new one. Reinstall the filter and housing cover, ensuring a secure fit. Regularly check and clean/replace the filter based on usage and environmental conditions.
Spark Plug Inspection/Replacement
Regular spark plug inspection ensures efficient combustion and starting. First, disconnect the spark plug wire, being careful to avoid electrical shock. Remove the spark plug using a correctly sized socket wrench. Inspect the electrode for wear, carbon buildup, or damage. A healthy spark plug will have a tan or gray color.
If the plug is fouled or damaged, replace it with a new spark plug of the correct type, as specified in the generator’s specifications. Gap the new spark plug to the recommended distance using a spark plug gapping tool.
Reinstall the spark plug, tightening it to the specified torque. Reconnect the spark plug wire securely. A properly functioning spark plug contributes to smooth operation and extended engine life.

Troubleshooting Common Issues
This section provides solutions for typical problems like starting failures, reduced power, and overload shutdowns, ensuring quick resolution and continued operation.
Generator Won’t Start
If your Generac 5500 fails to start, begin with the simplest checks. Ensure the fuel tank isn’t empty and the fuel valve is open. Verify the battery is fully charged and properly connected – a weak battery is a common culprit, especially with electric start models.
Next, inspect the spark plug; a fouled or damaged plug will prevent ignition. Confirm the low oil shutdown sensor isn’t activated by checking the oil level. Also, examine the air filter for obstructions. If using the recoil start, ensure the recoil rope is functioning correctly and not tangled.
Finally, check the circuit breaker; a tripped breaker can prevent starting. If problems persist, consult a qualified technician for further diagnosis.
Low Power Output
Experiencing low power from your Generac 5500? First, verify you aren’t exceeding the generator’s wattage capacity. Overloading causes reduced output and potential damage. Check all connected appliances and their wattage requirements. A dirty air filter restricts airflow, diminishing performance; clean or replace it as needed.
Low oil levels can trigger a safety shutdown, reducing power. Ensure the oil is at the correct level. Inspect the spark plug for fouling or damage, as this impacts combustion efficiency. A partially clogged fuel filter can also restrict fuel flow, leading to reduced output.
Finally, confirm the generator is receiving adequate ventilation; restricted airflow hinders cooling and performance.
Overload Protection Tripping
If your Generac 5500’s overload protection frequently trips, it indicates the connected electrical load exceeds the generator’s capacity. Immediately disconnect some appliances or devices to reduce the overall wattage demand. Carefully calculate the total running wattage of everything plugged into the generator before restarting.
Ensure you’re accounting for starting wattage, which is often higher than running wattage for motors and compressors. A faulty appliance with a short circuit can also trigger the overload protection, even if the total running wattage seems within limits.
Inspect cords and connections for damage. Repeated tripping suggests a consistent overload or a potential issue with an appliance.

Warranty Information
Your Generac 5500 is covered by a comprehensive warranty protecting against manufacturing defects, ensuring peace of mind and reliable power solutions.
Generac Warranty Coverage
Generac stands behind the quality and reliability of the 5500 generator with a robust warranty program. Typically, this coverage encompasses defects in materials and workmanship for a specified period, often starting from the original date of purchase. Residential use generally receives a longer warranty duration compared to commercial applications.
The warranty specifically covers components crucial to the generator’s operation, including the engine, alternator, and control panel. However, it’s important to note that wear-and-tear items, such as spark plugs and air filters, are usually excluded. Damage resulting from improper maintenance, misuse, or acts of nature is also not covered.
Detailed warranty terms, including the exact duration and specific exclusions, are outlined in the official warranty document included with your Generac 5500. Always refer to this document for complete and accurate information regarding your warranty rights.
Claim Process
To initiate a warranty claim for your Generac 5500, begin by contacting Generac’s customer service department. You’ll need your original proof of purchase, the generator’s model and serial number, and a detailed description of the issue. Generac may request photos or videos documenting the defect.
A Generac representative will assess your claim and, if approved, provide instructions for repair or replacement. You may be directed to an authorized Generac service dealer for repairs. Keep all documentation related to the claim, including repair orders and invoices.
Generac reserves the right to inspect the defective part before authorizing a replacement. Shipping costs for returning the defective part may be your responsibility. Following these steps ensures a smooth and efficient warranty claim process.