Replacing the oil and oil filter should happen at every 200 hours or every two years, whichever comes first. Checking the spark plug, valve clearance, sediment trap, and replacing the air filter should occur at 400 hours or every 4 years, whichever comes first. For home standby generator maintenance, regular maintenance includes changing air filters, oil and oil filters, spark plugs, checking battery charge, sediment traps, valve clearance, and cleaning the generator from dirt and debris inside the enclosure and outside around the unit.
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