Because your grass line trimmer is a relatively simple tool, you might forget that it needs routine maintenance just like your other lawn tools. Taking a few basic steps goes a long way toward keeping your trimmer ready.
Hang a calendar in your garage or storage shed so you can easily keep track of when you use your line trimmer and for how long. Refer to the owner's manual for recommended maintenance intervals. Here are typical guidelines.
At the start of each season
Put fresh fuel into a gas-powered trimmer and check the cords on an electric trimmer.
Replace the trimmer line, too. Old line can become brittle and break easily.
Before each use
if you have a gas-powered grass trimmer, fill the tank with the gas–oil mix recommended in the owner's manual; 40 parts unleaded gasoline to one part 2-cycle engine oil is typical. If you have an electric trimmer, check the cords.
Make sure you have plenty of replacement trimmer line on hand. If you're using a blade, inspect it carefully and replace it if it's bent or broken.
After each use
Let your trimmer cool for several minutes (if it's electric, unplug it) and then use a soft brush and cloth to remove grass clippings, dirt and other debris. Pay special attention to clearing the air intake vents on gasoline-powered trimmers.
Refill the trimmer head with line if it's running low, so you won't run out in the middle of your next trimming session.
Inspect the trimmer for loose or damaged parts and repair them before you put the machine away.
After every 10 hours of use
Clean your trimmer's air filter to ensure efficient engine performance. Wash the filter in detergent and water, then rinse it and let it dry. Work a few drops of oil into the clean, dry filter if recommended for your trimmer, and then reinsert it.
After every 25 hours of use
Remove and inspect the spark plug on a gas-powered trimmer. Clean or replace it if it's dirty.
Before storing for the winter
Before you put your trimmer away for the season, give it a thorough cleaning and lightly oil the metal surfaces to prevent rust.
If you have a gas-powered trimmer, either empty or stabilize any fuel remaining in your trimmer. To get rid of the fuel, drain the tank into a US Department of Transportation-approved gas can, then start the engine and let the machine run until it stops on its own. To store your trimmer with a full tank, add a fuel stabilizer to the gasoline–oil mix in your gas can, shake it, and use the new mixture to top off your trimmer's tank. Run the engine for about 5 minutes to circulate the treated fuel through the engine. If you already use a 2-cycle engine oil formulated with a stabilizer, you don't need to add stabilizer.
If the line trimmer won't start even though there's fuel in the tank, the carburetor could be the problem. Follow these instructions to replace the carburetor in under 30 minutes.
If the line trimmer engine won't start even though there's fuel in the tank, the carburetor could be the problem. Follow these instructions to do the job in under 30 minutes.
Use the advice and tips in these articles and videos to get the most out of your grass line trimmer.
Tune of your grass line trimmer, following the steps in this video.
Follow the steps in this video to replace a leaking fuel line in a line trimmer.