If you rely on a Generac standby generator to protect your home or business during power outages, regular professional maintenance is essential. At Clark Sales & Service, we help customers throughout our local service area keep their generators reliable, efficient, and ready when the grid goes down.
So how often does a Generac generator really need service? The answer depends on time, operating hours, and usage, but there are clear manufacturer-backed guidelines every owner should follow.
Standard Generac Generator Maintenance Intervals
Generac recommends professional servicing at least once per year or every 100 hours of operation, whichever comes first. However, comprehensive generator care follows a multi-year maintenance schedule.
Every 6–12 Months (or 100 Operating Hours)
This is the most common and most important service interval.
Typical annual maintenance includes:
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Oil and oil filter change
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Battery inspection and testing
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Fluid level checks
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System diagnostics
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Cleaning of internal components
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Visual inspection for wear or damage
For most residential and light commercial generators, this annual service keeps the unit compliant with manufacturer recommendations.
Schedule A Maintenance – Every 2 Years or 200 Hours
In addition to annual service tasks, Schedule A maintenance includes deeper component inspections.
Schedule A services often include:
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Air filter replacement
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Spark plug inspection or replacement
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Valve clearance inspection
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Fuel system review
This level of service helps maintain fuel efficiency and prevents performance issues during extended outages.
Schedule B Maintenance – Every 4 Years or 400 Hours
Schedule B covers advanced inspections and long-term wear components.
Schedule B tasks may include:
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Sediment trap cleaning
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Advanced fuel and engine system checks
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Comprehensive performance testing
These services are especially important for generators that run frequently or support critical systems.
Routine Checks Between Professional Service Visits
While professional maintenance should always be performed by a certified technician, homeowners and facility managers can monitor basic conditions.
Recommended routine checks:
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Weekly or Monthly:
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Check oil levels
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Listen for unusual noises
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Ensure the enclosure is clean and unobstructed
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System Alerts:
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Watch for yellow warning lights or “SERVICE” messages on the control panel
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Address alerts promptly to avoid larger issues
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If your generator is signaling for service, it’s best to schedule an inspection right away.
Why Regular Generator Service Matters
Skipping maintenance may seem harmless—until the power goes out.
Reliability During Outages
A properly maintained generator starts automatically and runs smoothly when you need it most.
Extended Generator Lifespan
With consistent care, a standby generator can last 20 years or more, protecting your long-term investment.
Fewer Emergency Repairs
Proactive maintenance reduces the risk of costly failures involving engines, batteries, or fuel systems.
Trust Clark Sales & Service for Generac Generator Maintenance
At Clark Sales & Service, we provide professional Generac generator servicing designed to meet manufacturer specifications and local operating conditions. Whether your generator supports a home, farm, or commercial facility, our experienced technicians ensure it’s ready year-round.
If you’re unsure when your generator was last serviced—or you’ve seen a service alert—now is the time to schedule maintenance.
Contact Clark Sales & Service today to keep your Generac standby generator running reliably, safely, and efficiently.
