Symptoms
- Airflow noticeably weaker than when new
- Blower struggles to move wet or heavy leaves
- Motor sounds strained
- Battery-powered blower loses power quickly during use
Likely causes
- CommonClogged air intake screenDebris and grass clippings get pulled into the intake and restrict airflow.
- CommonDirty air filter (gas models)A clogged filter reduces engine power and airflow output.
- CommonAging or low-charge batteryBatteries lose capacity over repeated charge cycles and put out less sustained power.
- PossibleDebris stuck in the fan housing or impellerSticks or clumped debris can partially block the fan blades.
- Less commonWorn engine or motorGeneral wear over years of use gradually reduces output.
What to do
- Turn off and unplug or remove the battery before inspecting the intake.
- Clear any debris, leaves, or grass from the intake screen and fan housing.
- Clean or replace the air filter on gas models.
- For battery models, check the battery charge level and try a different battery if available to isolate the issue.
- Inspect the fan blades for cracks or stuck debris that could throw off balance and airflow.
- For gas models, check fuel freshness and spark plug condition since a weak-running engine also means weak airflow.
- If power stays low after cleaning, the motor or engine may be wearing out and should be evaluated by a repair shop.
Tools and parts
- Air filter (gas models)
- Small brush
- Spare battery for testing
Air filterSearch: “leaf blower air filter”
Replacement batterySearch: “cordless blower battery pack”
When to call a pro
If cleaning and battery swaps don't restore power, have the motor or engine inspected by a small-engine repair shop.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.