Generac GP6500 Parts Manual: A Comprehensive Guide
This guide details the Generac GP6500, offering parts information and repair assistance. Exploded diagrams are available online via GENservice at generac.com.
The Generac GP6500 is a popular portable generator known for its reliable power output and robust design. This manual serves as a vital resource for owners and technicians alike, providing detailed information for parts identification, troubleshooting, and repair. Understanding your GP6500’s components is crucial for maintaining optimal performance and extending its lifespan.
Generac offers comprehensive support, including exploded view drawings accessible through their online platform, GENservice (www.generac.com). These resources, alongside this manual, empower users to confidently address maintenance needs. Different serial number ranges (e.g., 7450603A, 6702064A) may correspond to specific model variations, so accurate identification is key when sourcing replacement parts.
Understanding the GP6500 Model Variations
The Generac GP6500 has seen variations throughout its production run, impacting parts compatibility. Identifying your specific model year and serial number is paramount for accurate parts ordering. Generac differentiates models based on serial number ranges; for example, units beginning with 7450603A differ from those with 6702064A.
These variations can affect components like the engine (389cc), electrical systems, and even minor assembly details. Utilizing Generac’s online resources, GENservice, and referencing the correct parts manual (PMNL E 389cc G19) ensures you obtain the precise replacement parts needed. Ignoring these distinctions can lead to incorrect parts and unsuccessful repairs.
Locating the Correct Parts Manual
Finding the appropriate parts manual for your Generac GP6500 is crucial for successful repairs. Generac offers both physical and digital versions. The owner’s manual (OMNL G GP6500-GP8000E 60Hz G19 ENFRSP) often directs you to the correct parts manual number.
However, the most comprehensive resource is Generac’s online platform, GENservice (www.generac.com). Here, you can input your generator’s serial number to access the specific parts manual tailored to your unit. Parts lookup is simplified by entering the model number or selecting from a list. Ensure you have the correct serial number to avoid ordering incompatible parts.
Accessing Generac’s Online Resources (GENservice)
GENservice, found at www.generac.com, is Generac’s primary online resource for GP6500 parts and documentation. This platform provides access to exploded view drawings, crucial for identifying components and understanding assembly. You’ll need your generator’s serial number to unlock the correct manual and diagrams.
GENservice allows you to search for parts by model and serial number, ensuring compatibility. Beyond parts manuals, it often includes troubleshooting guides and instructional videos. It’s a valuable tool for both DIY repairs and professional technicians. Remember, all parts not shown in the standard manual are often detailed within these online resources.
Decoding Serial Numbers for Accurate Parts Identification
Your Generac GP6500’s serial number is vital for obtaining the correct parts. It pinpoints the specific manufacturing date and any model variations. Parts compatibility can change even within the same model year, making the serial number essential.
Locate the serial number plate on your generator. When using GENservice or contacting a Generac dealer, provide this number. For example, units beginning with serial number 7450603A have specific parts lists. Different serial number ranges (like 6702064A ⎻ 7202021A or 8279676A ⏤ 9103126A) indicate different component versions. Accurate identification prevents ordering incorrect parts.

Key Components and Their Parts
Generac GP6500 components include the engine, alternator, recoil starter, and fuel system. Parts breakdowns and diagrams are available for each system.
Engine Parts Breakdown
The engine is the heart of the Generac GP6500, and understanding its components is crucial for maintenance and repair. Parts include the cylinder, piston, connecting rod, crankshaft, and valve train. Detailed diagrams, accessible through Generac’s online resources like GENservice, illustrate these assemblies.
Specific parts within the cylinder and piston assembly encompass the piston rings, wrist pin, and cylinder head. Proper identification, using the parts manual and serial number, ensures compatibility. Exploded views showcase the precise arrangement of each component, aiding in reassembly. Accessing these resources simplifies troubleshooting and parts replacement.
Cylinder and Piston Assembly
The cylinder and piston assembly are vital for combustion within the Generac GP6500 engine. Key components include the piston, piston rings, wrist pin, connecting rod, and cylinder head. Parts manuals and exploded diagrams, found on GENservice (generac.com), detail their arrangement.
Proper maintenance requires understanding the function of each part. Piston rings seal combustion, while the wrist pin connects the piston to the connecting rod. Serial number-specific parts lists ensure correct replacements. Referencing these resources simplifies repairs and maximizes engine performance, preventing costly issues.
Carburetor and Fuel System Parts
The carburetor and fuel system are crucial for delivering the correct air-fuel mixture to the Generac GP6500 engine. Essential parts include the carburetor itself, fuel filter, fuel pump, and fuel lines. Detailed diagrams on Generac’s GENservice (generac.com) illustrate their assembly.
Troubleshooting fuel issues often requires inspecting these components. A clogged fuel filter or a faulty carburetor can cause starting problems or reduced power. Parts manuals help identify the correct replacement parts based on your generator’s serial number. Maintaining a clean fuel system ensures optimal engine operation and longevity.
Ignition System Components
The ignition system is vital for starting and running the Generac GP6500. Key components include the ignition coil, spark plug, and associated wiring. Exploded views available through Generac’s GENservice (generac.com) showcase their precise arrangement. A malfunctioning ignition system results in difficult starting or engine misfires.
Parts manuals are essential for identifying the correct spark plug and coil for your specific GP6500 model, referencing the serial number. Regular spark plug replacement is crucial for maintaining optimal performance. Always disconnect the spark plug wire before working on the ignition system for safety.
Alternator and Electrical System Parts
The alternator and electrical system are core to the GP6500’s power generation. Critical parts include the stator, rotor, voltage regulator, and wiring harness. Generac’s online resources, specifically GENservice at generac.com, provide detailed exploded diagrams for accurate identification. A faulty voltage regulator can lead to unstable power output or damage to connected devices.
Parts manuals help pinpoint the correct components based on your generator’s serial number. Inspect wiring for damage and ensure connections are secure. Proper maintenance of these parts ensures reliable and safe operation of the GP6500.
Stator and Rotor Assembly
The stator and rotor are fundamental to the GP6500’s alternator, converting mechanical energy into electrical power. Parts manuals and exploded diagrams, accessible through Generac’s GENservice (generac.com), are crucial for identifying specific components. Damage to these parts often results in a complete power failure.
Inspect the stator windings for shorts or open circuits, and the rotor for bearing wear. Replacement often requires specialized tools and knowledge. Ensure correct alignment during reassembly. Refer to your GP6500’s serial number to confirm compatibility when ordering replacement parts, as variations exist.
Voltage Regulator and Wiring
The voltage regulator maintains a stable output from the GP6500, protecting connected devices. Wiring harnesses connect the regulator to the stator, rotor, and output terminals. Generac’s online resources, including GENservice at generac.com, provide detailed diagrams for tracing and identifying these connections.
Faulty regulators can cause voltage spikes or drops. Inspect wiring for corrosion, breaks, or loose connections. Parts manuals detail specific regulator models based on your generator’s serial number; Always disconnect the spark plug before working on the electrical system for safety. Proper wiring is essential for optimal performance.
Recoil Starter and Starting System Parts
The recoil starter assembly allows manual starting of the GP6500. Key components include the starter rope, pulley, pawls, and spring. Parts manuals illustrate the precise arrangement of these elements. A worn rope or faulty pawls can prevent starting. Generac’s online resources, like GENservice, offer diagrams for disassembly and repair.
Inspect the recoil assembly for damage or wear. Lubrication of moving parts ensures smooth operation. Replacement parts are readily available through authorized dealers and online retailers. Always ensure the engine is off before servicing the starting system.

Fuel Tank and Fuel System Components
The fuel system of the GP6500 comprises the fuel tank, fuel lines, fuel filter, and fuel shut-off valve. Parts manuals detail each component’s location and specifications. A clogged fuel filter or deteriorated fuel lines can cause starting or performance issues. Generac’s GENservice provides exploded diagrams for easy identification.
Regularly inspect fuel lines for cracks or leaks. Replace the fuel filter as part of routine maintenance. Always use fresh fuel and a fuel stabilizer to prevent carburetor problems. Authorized dealers stock genuine Generac fuel system parts.

Troubleshooting with the Parts Manual
Utilize exploded diagrams to pinpoint faulty parts during repair. Identify common GP6500 issues and use symptom-based parts replacement for efficient troubleshooting.
Using Exploded Diagrams for Repair

Exploded diagrams, readily accessible through Generac’s online GENservice platform (www.generac.com), are invaluable tools for GP6500 repair. These detailed visuals break down the generator into individual components, showcasing their precise placement and relationship to one another.
When diagnosing an issue, carefully compare your generator’s current state to the diagram. This allows for quick identification of missing, damaged, or incorrectly installed parts. The manuals and online resources provide a clear visual representation, simplifying the repair process even for those with limited mechanical experience.
Remember to reference the correct diagram based on your generator’s serial number to ensure accuracy. Utilizing these diagrams significantly reduces repair time and minimizes the risk of errors.
Identifying Common GP6500 Issues
The Generac GP6500, while robust, can experience recurring problems. Common issues include carburetor malfunctions, often requiring cleaning or rebuild parts. Electrical system failures, particularly with the voltage regulator, are also frequently reported. Parts manuals and online resources pinpoint these areas.
Starting system difficulties, stemming from a faulty recoil starter or ignition components, are prevalent. Fuel system problems, like clogged fuel filters or a deteriorated fuel tank, can hinder operation. Utilizing the parts manual’s exploded views aids in diagnosing these issues.
Regular maintenance, guided by the manual, can prevent many of these problems, extending the generator’s lifespan and ensuring reliable power.
Symptom-Based Parts Replacement
Using the Generac GP6500 parts manual, diagnose issues by observed symptoms. For example, if the generator fails to start, inspect the recoil starter, ignition system parts, and fuel supply. A weak electrical output suggests a faulty voltage regulator or stator.
Referencing exploded diagrams helps pinpoint the exact component needing replacement. If the engine runs roughly, examine the carburetor and fuel system parts for obstructions. The manual facilitates targeted repairs, avoiding unnecessary component changes.
Always verify parts compatibility using the generator’s serial number. Accurate diagnosis, guided by symptoms and the manual, ensures efficient and cost-effective repairs.

Where to Purchase Generac GP6500 Parts
Generac GP6500 parts are available through authorized dealers and online retailers like eReplacementParts, offering both OEM and aftermarket options.
Authorized Generac Dealers

Authorized Generac dealers represent the most reliable source for genuine GP6500 parts. These dealerships maintain a direct relationship with Generac, ensuring access to the latest parts manuals, exploded diagrams, and a comprehensive inventory of OEM components.
Benefits of choosing an authorized dealer include expert advice from trained technicians, assistance with parts identification using your generator’s serial number, and the guarantee of receiving authentic Generac quality. Locating a dealer is straightforward through the official Generac website’s dealer locator tool.
They can also assist with warranty claims and provide valuable insights into common GP6500 issues and recommended maintenance procedures. Prioritizing an authorized dealer ensures proper fit and function, maximizing the lifespan and performance of your generator.
Online Parts Retailers (eReplacementParts)
eReplacementParts offers a convenient online platform for sourcing Generac GP6500 parts. Their website provides detailed diagrams and parts lists, simplifying the identification process. Users can search by model number or specific component to locate the required items.
eReplacementParts often features instructional videos demonstrating repair procedures, enhancing the DIY experience. While offering both OEM and aftermarket options, verifying part compatibility with your generator’s serial number is crucial.
Consider shipping costs and return policies when ordering. This retailer is a valuable resource, particularly for those comfortable with self-repair and seeking a broad selection of parts for their GP6500 generator.

Understanding OEM vs. Aftermarket Parts
OEM (Original Equipment Manufacturer) parts are produced by Generac, ensuring exact fit and performance for your GP6500. They typically carry a higher price tag but guarantee compatibility and maintain the generator’s original specifications.
Aftermarket parts are manufactured by third-party companies and can be more affordable. However, quality can vary significantly. While some aftermarket parts meet or exceed OEM standards, others may not, potentially impacting performance or longevity.
When choosing, consider your budget and repair needs. For critical components, OEM parts are often recommended. Always verify compatibility, especially with aftermarket options, to avoid issues.

Safety Precautions When Working with GP6500 Parts
Always disconnect the spark plug before repairs. Handle fuel with care, and utilize appropriate tools for safe and effective GP6500 maintenance.
Disconnecting the Spark Plug
Before commencing any maintenance or repair work on your Generac GP6500, a crucial safety step is to disconnect the spark plug. This prevents accidental starting, eliminating the risk of injury from a rotating engine or electrical shock. Locate the spark plug, typically near the engine, and carefully remove the spark plug wire.
Ensure a firm grip on the boot, not the wire itself, to avoid damage. Once detached, secure the wire away from the spark plug to prevent accidental reconnection. This simple precaution is paramount for a safe working environment, safeguarding you from potential hazards during the repair process. Always double-check disconnection before proceeding.
Fuel Handling Safety
When dealing with fuel for your Generac GP6500, prioritize safety above all else. Gasoline is highly flammable, demanding extreme caution. Always work in a well-ventilated area, away from open flames, sparks, or heat sources. Before refueling or draining the tank, ensure the engine is completely cool.
Use a funnel to prevent spills, and never overfill the fuel tank; Have a fire extinguisher readily available. Properly store fuel in an approved container, away from living areas. Dispose of old fuel responsibly, following local regulations. Avoid skin contact and inhalation of fumes – wear appropriate gloves and eye protection.
Proper Tool Usage
Maintaining your Generac GP6500 requires the correct tools. Using inappropriate tools can damage parts and create safety hazards. Always select tools designed for the specific task, ensuring they are in good working condition. Employ the right size wrenches and sockets to prevent rounding off fasteners.
When disassembling components, use penetrating oil to loosen stubborn parts. Avoid excessive force; let the tool do the work. Wear safety glasses to protect your eyes from flying debris. Properly calibrated torque wrenches are crucial for reassembly, ensuring components are tightened to specification.
