A spark plug, air filter, and oil bottle on a workbench

Lawn mower maintenance basics

Oil, spark plug, filters, the deck, and the manual.

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Start with the manual

Ohio State says to use the maintenance schedule provided in the operator's manual. The CPSC says to check the manual for routine maintenance, including engine oil levels.

Engine off first

Ohio State says to shut off the engine and disconnect the spark plug wire before performing maintenance and before unclogging the mowing deck.

Oil

Ohio State says to maintain proper oil levels and lubrication of moving parts. Use the oil type and amount your manual lists.

Spark plug and filters

LSU AgCenter says the end of the season is a good time to inspect the spark plug and the air and fuel filters, and to replace them if needed. It says to check the operator's manual for the correct plug gap.

Deck and guards

Ohio State says to remove excess grass clippings from the mowing deck, and to inspect and adjust deflector guards and safety features, replacing them if necessary.

Parts and emissions

EPA says that for routine maintenance you still need to avoid changes that might increase emissions. Follow the maker's instructions.

Sources: Ohio State University Extension, Power Lawn Mowers; CPSC, Power Lawn Mowers (Publication 5126, PDF); LSU AgCenter, Preparing Small Engines for Storage; EPA, How to Maintain or Rebuild Engines Certified to EPA Standards (PDF); AAOS OrthoInfo, Lawn Mower Safety.

FAQ

How often should I change the oil?

Follow the manual. LSU AgCenter says to change the oil before storing a four-stroke engine.

Should I service it each spring?

AAOS says to have a lawn mower serviced when you use it for the first time in a season.

General information only. Read the operator's manual before you mow. Keep children and pets indoors or well away from the area you mow, and never let a child ride on a mower as a passenger. The American Academy of Pediatrics says that, in general, children should be at least 12 years old to operate a walk-behind power mower safely and at least 16 to operate a riding mower safely. Before you clear, adjust, or service the blade area, turn the mower off, wait for the blade to stop, and disconnect the spark plug wire; on a battery or corded electric mower, follow the manual to disconnect its power. Refuel outdoors, only with the engine off and cool. Wear sturdy closed-toe shoes and eye and hearing protection. In an emergency, call 911.

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