Otis Singleton
Electric string trimmers are low-maintenance tools that can be easily repaired at home. Common issues with electric trimmers include a lack of power, faulty power cords, switches, or motors, and overheating. To fix an electric string trimmer, you should first identify the problem, which could range from a loose belt to a faulty motor. Once the issue is identified, you can follow simple steps to resolve it, such as cleaning the head of the machine, checking the power receptacle, or replacing the motor. Some issues may require more technical solutions, such as drilling and tapping a hole for a bolt or counterboring. Overall, with the right tools and knowledge, most problems with electric string trimmers can be easily addressed.
How to fix an electric string trimmer
| Characteristics | Values |
|---|---|
| Problem | The unit runs out of string, the string is twisted or loose on the spool, the cutting head is dirty, the head outlet guide is bent, the power cord is faulty, the switch is faulty, the motor is faulty |
| Solution | Check the string thickness and wind it correctly, clean the head of the machine, check the power cord for cuts, test the electrical cord, switch, and motor, follow the instructions in the owner's manual |
| Maintenance | Clean the machine before and after each use, remove any debris, check the oil and other fluids, lubricate the machine, store the machine completely dry |
| Troubleshooting | Check the lock-out switch, listen for a click when pulling the trigger, check the breaker supplying the power, ensure the battery is charged, check the fuel lines for blockage, check the air filter or exhaust port for blockage, check the lubrication points |
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What You'll Learn
Check the power source, electrical receptacle, cord, switch, and motor
If your electric string trimmer is not working, the first thing to do is to check the power source. Ensure that the power is on at the electrical receptacle. Check the electrical cord for any cuts or damage, and if any are found, wrap them with electrical tape. If you are using an extension cord, check that it has the proper capacity for the trimmer by referring to your owner's manual.
Next, test the switch. If the trimmer is not turning on, there may be an issue with the micro switch not being activated. To troubleshoot this, push the lock out down and pull the trigger. If you hear a click, the issue is likely with the motor, and the trimmer may not be repairable. If you do not hear a click, the lock-out (internal physical blocker) on top of the handle may be preventing the trigger from pushing the micro switch button.
If the power source, electrical receptacle, and cord are functioning properly, the issue may be with the motor. Detach the trimmer accessory to access the motor more easily. Remove the screws holding the motor halves together, but do not separate the halves to avoid damaging the data label, in case you need to use the warranty. Pull out the drive shaft slowly to get a view of the trigger mechanism. The issue is likely in this area, and you may need to swap out the trigger spring.
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$13.99
Ensure the correct fuel mixture for gas-powered trimmers
Gas-powered trimmers require a mix of gas and oil to function. The correct mixture will ensure the engine is lubricated and prevent damage to the engine.
The make and model of your trimmer will determine the correct fuel-to-oil mixture. For example, Stihl products require a ratio of 50:1 (50 parts gas to 1 part oil), while Weed Eater products require a 40:1 mixture, and Ryobi products run on a 32:1 mixture.
The gas used should be unleaded with a minimum octane rating of 89 (mid-grade) and a maximum ethanol content of 10%. The oil used should be a 2-cycle premium oil that is ISO-L-EGD and JASO M345.
It is important to note that gas begins to break down as soon as 30 days after purchase, so it is recommended to use fresh gas and consume it within 30 days. If you are unable to use it within this time frame, you can add a fuel additive like Sea Foam Motor Treatment to stabilize the gas and reduce moisture, allowing it to last longer.
To mix the fuel, use a vessel that is approved for use with fuels. Pour in the oil first, followed by the gas, then seal the canister and shake to combine the mixture.
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Clean the trimmer head and remove debris
To clean the trimmer head and remove debris from an electric string trimmer, you should first unplug the device or remove the battery if it is a battery-powered model. Electric string trimmers are not waterproof, so avoid rinsing the trimmer with water. Instead, use a soft brush to dust off any loose debris and dirt from the trimmer head. You can also try using a vacuum cleaner with a brush attachment to remove dry grass or debris from the trimmer head.
Next, use a rag or a piece of cloth made from a tough material to scrub the outside of the trimmer, moving towards the sensitive parts. You can use detergent mixed with water to help with stain removal, but be careful not to scrub too hard, especially if your trimmer has a plastic body. Pay special attention to the exhausts, as they are often neglected during cleaning. Use a cotton swab dipped in oil to wipe the exhausts and intakes, going as deep as possible to ensure proper cleaning.
After cleaning the outside, focus on the interior of the trimmer. Use a compressed air can to blow away any dust or debris that has accumulated inside the block, as this can cause the trimmer to heat up. Finally, remember to oil your electric string trimmer regularly to prevent rust and keep it working at maximum efficiency. Always store your trimmer in a cool, dry place away from other objects to avoid bacterial contamination.
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Check the trimmer line and spool for damage or tangles
To check the trimmer line and spool for damage or tangles, you must first locate the spool on the bottom of the trimmer head. It may be covered by a cap or guard, so make sure to remove any attachments before proceeding. Once you've located the spool, carefully remove it from its housing. Some spools may have a small clip or latch that needs to be released before they can be slid off, so be sure to check for any additional mechanisms.
Once the spool is removed, take the time to inspect it for any debris, damage, or tangles. If the spool is damaged or excessively dirty, it may need to be replaced or cleaned. Refer to your user manual for guidance on this. If the spool is in good condition, examine the trimmer line for any tangles, knots, or damage. If the line appears tangled or knotted, carefully remove it from the spool and rewind it, ensuring that it can release smoothly without getting stuck.
To check for proper line feeding, turn on your trimmer and observe the line as it spins. Ensure that the line feeds out evenly and smoothly, without any tangles or snags. If you notice any issues with the line feeding, it could indicate a problem with the trimmer, such as a clogged or damaged line. In such cases, you may need to troubleshoot and make necessary repairs or adjustments before using the trimmer again.
It is important to maintain proper line tension when winding the trimmer line onto the spool to prevent tangles. Keep a firm grip on the line, ensuring it stays taut as you wind. Additionally, consider the type of line you are using. Different line shapes, such as round, square, or twisted, are available, each offering varying levels of cutting performance. Choose a line shape that's compatible with your trimmer head and one that suits your specific cutting requirements.
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Troubleshoot common problems like starting issues or a weak spark plug
Electric string trimmers are generally low-maintenance, but they can develop problems that will need troubleshooting. If your electric string trimmer doesn't start, the first thing to do is to check if the power is on at the electrical receptacle. Test the electrical cord, switch, and motor. If the trimmer lacks power or overheats, ensure you are using an outdoor extension with the proper capacity for the trimmer. Check your owner's manual for guidance.
If your trimmer starts but doesn't run smoothly, the spark plug may be faulty. If you don't have a spark, you probably have to replace the ignition coil/module. If you have a weak spark, try cleaning, regapping, or replacing the spark plug. You can test the spark using a short test lead with alligator clips. Remove the spark plug, reconnect the plug wire, and use the test lead to connect the plug ground electrode to a good engine ground point. Turn on the ignition switch and pull the starting cord quickly. You should see a spark in the plug gap.
If your trimmer powers on and spins but is not cutting weeds, there may be a problem with the trimmer line. The line may be too short or stuck, and you may need to replace it. Always ensure you are using the correct line thickness as recommended by the manufacturer.
To prevent issues with your electric string trimmer, it is important to clean and maintain the equipment. Remove any debris from the machine, especially near the head of the machine and the nylon string. A buildup of debris can cause the machine to malfunction and can even be a fire hazard.
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Frequently asked questions
There could be a number of reasons for this. First, check if the power is on at the electrical receptacle and test the electrical cord, switch, and motor. If the trimmer lacks power or overheats, ensure you are using an outdoor extension with the proper capacity for the trimmer.
Electric string trimmers are generally low maintenance, but they can develop problems. For corded trimmers, ensure they are plugged into a dedicated outlet, as using them with other appliances can trip the breaker. Battery-powered trimmers should be charged for a few hours before use. Additionally, keep the trimmer head clean and free from debris, which can cause operational issues and pose a fire hazard.
First, check if the line is twisted or loose on the spool. Ensure the line is wound correctly and is of the correct thickness. Refer to the owner's manual for guidance on the recommended line thickness and any specific instructions for your trimmer.
