Quick Answer
If your cordless grass trimmer is running slower than normal or has lost cutting power, the most common causes are blocked ventilation slots, an incorrectly fitted spool, the wrong cutting line, or a worn spool.
Checking these components will often restore normal performance.
Before You Start
Before inspecting your grass trimmer, make sure:
- The trimmer is switched off
- The battery has been removed
- The cutting head has come to a complete stop
Always:
- Wear protective gloves when handling the cutting head
- Work on a clean, stable surface
- Refer to your user manual for the correct line specification
Important: Never carry out maintenance while the battery is installed.
How to Improve the Trimmer Speed
Follow these steps to identify and resolve the issue.
1. Check the ventilation slots
Inspect the motor vents for:
- Grass clippings
- Dust
- Dirt or debris
Blocked vents can restrict airflow and reduce motor performance.
2. Check the cutting line
Ensure you are using the correct line for your model.
Most models require a line diameter of 1.2 mm, but always refer to your user manual for the correct specification.
Using the wrong size line can reduce cutting performance and affect motor speed.
3. Inspect the spool
Remove the spool and check that:
- The line is wound correctly
- The line feeds freely
- The spool is not damaged or excessively worn
An incorrectly wound spool can create resistance and slow the trimmer.
4. Try the spare spool
If your grass trimmer was supplied with an additional spool and line, install it and test the machine again.
This helps determine whether the original spool is causing the problem.
If the Problem Continues
If you have completed all of the above checks and the trimmer is still running slowly:
- Contact our customer service team via Live Chat
- Or submit a support ticket with your model number and a description of the issue
Our team will be happy to assist with further troubleshooting.
Important Maintenance Tips
- Keep the motor vents clean after every use
- Always use the correct line diameter for your model
- Replace worn or damaged spools promptly
- Store the trimmer in a clean, dry place
- Regularly inspect the cutting head for signs of wear
Frequently Asked Questions
Why is my cordless grass trimmer running slowly?
The most common causes are blocked air vents, an incorrectly wound spool, or using the wrong cutting line.
What line should I use?
Most cordless grass trimmers use 1.2 mm trimmer line, but you should always check your user manual for your specific model.
Can the spool affect the trimmer speed?
Yes. A damaged or incorrectly wound spool can create extra resistance and reduce cutting performance.
Why should I clean the ventilation slots?
Blocked vents reduce airflow to the motor, which can cause overheating and lower performance.
What should I do if none of these steps work?
If the problem persists after completing these checks, please contact our customer service team for further assistance.
