Disconnect the sparkplug (figure A) before performing any lawnmower maintenance. To change a sparkplug, loosen it with a plug wrench (figure B), and turn it counterclockwise. If the plug isn't corroded or damaged, you may be able to clean and reuse it. Otherwise, replace the old plug. A new plug will help keep your mower running smoothly. One of the most common sources of lawnmower problems is the air filter, usually located within the body of the mower engine. To change the filter, remove the cover and pull the filter out. You may be able to blow out any debris from the filter, but you should change it if it becomes noticeably dirty (figure C). Keep your wheels in good order by lubricating them periodically. Use a ratchet and socket to remove the wheel. Then smear some automotive grease on the axle, and replace the wheel. A sharp blade makes mowing much easier, and it's kinder to the grass. Check the blade periodically for sharpness and for the presence of nicks and dents. If the blade becomes dull, sharpen it yourself, or take it to a professional blade sharpener. Wear leather gloves when removing the blade. Hold the blade in place, and use a ratchet to turn the retaining nut counterclockwise (figure D). You may want to use a block of wood to help hold the blade still. If the nut gets stuck, loosen it by spraying it with a penetrating lubricant. Sharpen the blade with a file or a metal grinder. Always wear safety glasses when sharpening the blade. Check the cables periodically to make sure they're in good shape. You may want to lubricate them with dry graphite (figure E) to help keep them from wearing out.
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