How Does Auto Feed String Trimmer Work?

Good day!

Ever wondered why your trimming job gets interrupted for line feeding? You’re not alone in this – even I used to face the same issue until I discovered auto feed string trimmers. This mechanism utilizes an automatic-feeding system that ensures a continuous supply of line, making your lawn maintenance effortless.

Intrigued? Dive into this blog post and unlock the wonders of auto feed string trimmers!

How Does Auto Feed String Trimmer Work?

An auto feed string trimmer works by using a spool of nylon string that is automatically fed out as the trimmer line wears down.

An auto feed string trimmer is a smart tool. It uses centrifugal force to keep the line at the right length. As you cut, the line shortens; but no worries! The trimmer is doing its job well and feeds more line out automatically.

You don’t need to do anything.

In some old-style trimmers, you have to tap the head on the ground to get more line. This is not cool for many people as it disturbs their work flow. But with an auto feed string trimmer, there’s no bumping or tapping needed—it just works by itself! Some people have problems with it feeding too fast or not working right though.

So make sure yours is in good shape before each use!

Read more: Why Do Landscapers Take The Guard Off String Trimmers?

Benefits of Auto Feed Trimmer Heads

The auto feed trimmer heads offer continuous cutting without the need for manual line feeding, ensuring an efficient trimming experience.

Continuous cutting without manual line feeding

You’ll love using an auto feed string trimmer. It can keep cutting grass without a break. This is because of its smart design. The tool knows when the string gets short and feeds more line by itself.

This means you won’t need to stop and pull out more line each time it gets too short. Your work becomes quicker and smoother with an auto feed string trimmer. You stay focused on making your lawn look great, not feeding the trimmer line!

Efficient trimming experience

The auto feed trimmer does a great job. I can cut the grass fast and easy. The line comes out on its own, so I do not stop to pull it out. It saves time and effort. This tool makes my lawn look nice with less work for me.

Cutting the grass becomes simple and quick!

Reduced downtime for line replacement

With an auto feed trimmer head, you can say goodbye to the hassle of constantly stopping to replace the line. The automatic-feeding system in these trimmers detects when the line becomes too short and quickly dispenses more line for continuous cutting.

This means less downtime and more time spent actually trimming your lawn. So, no need to worry about interruptions or wasting time replacing the string – an auto feed trimmer head has got you covered!

User-friendly operation

Using an auto feed string trimmer is really easy. You don’t have to worry about manually feeding the line because the trimmer does it for you automatically. The trimmer head has a system that senses when the line gets too short and then feeds out more line as needed.

So, you can focus on trimming your lawn without any interruptions or hassle of bumping or advancing the line yourself. It makes trimming a breeze!

Read more: How Long Do Gas String Trimmers Last?

Maintenance and Tips for Auto Feed Trimmer Heads

To ensure optimal performance, regularly inspect and clean the cutting head of your auto feed trimmer.

Regularly inspect and clean the cutting head

Inspect and clean the cutting head to keep your auto feed string trimmer working well. Dust, grime, and grass clippings can build up on the debris shield and trimmer head, clogging it and making it less efficient. Cleaning regularly helps prevent this. Also, check for any signs of damage, like cracks or chips in the trimmer head housing. By doing this, you can ensure that the auto feed functionality keeps working properly. With routine maintenance like this, you’ll have a trimmer that performs at its best and lasts longer without any problems.

Properly wind the trimmer line

To properly wind the trimmer line, follow these steps:

  1. Start by removing the empty spool from the trimmer head.
  2. Cut a piece of new trimmer line to the recommended length for your specific model.
  3. Look for the arrows or directional indicators on the spool, which show the correct winding direction.
  4. Insert one end of the trimmer line into the small hole or anchor point on the spool.
  5. Wind the line evenly and tightly around the spool in a clockwise direction, following the directional arrows.
  6. Leave about 6 inches of line unwound to ensure proper feeding when using the trimmer.
  7. Once you have wound enough line onto the spool, insert the other end into another hole or anchor point on the spool.
  8. Make sure both ends of the trimmer line are securely anchored in their respective holes or anchor points.
  9. Place the fully wound spool back into the trimmer head, making sure it locks into place.

Use the correct line diameter for optimal performance

Regularly inspect and clean the cutting head

Using the correct line diameter is essential for getting the best performance out of your auto feed string trimmer. String trimmer manufacturers provide specifications on the proper size of replacement line to use, which is important to follow for optimal results.

Trimmer line comes in different diameters or weights, with common sizes ranging from 0.065 to 0.080 inches for lighter lines. Make sure to consider the specific trimmer head and its recommended line diameter when choosing the right replacement line.

Follow manufacturer’s instructions for line replacement

To ensure proper functioning of your auto feed trimmer head, it is important to follow the instructions provided by the manufacturer. Here are some tips to keep in mind:

  • Check the user manual or instructional guide for specific guidelines on line replacement.
  • Use the recommended type and diameter of trimmer line for optimal performance.
  • Follow the step-by-step instructions for removing the old line and inserting the new line into the cutting head.
  • Make sure to wind the new line tightly and evenly to prevent tangles and jams.
  • Double – check that the line is securely fastened before using the trimmer.
  • Regularly inspect and clean the cutting head to remove any debris or grass buildup that may affect performance.


In conclusion, auto-feed string trimmers work by using a clever automatic-feeding system. This system releases more line as it gets shorter, ensuring you always have enough for cutting.

With this convenient feature, you can enjoy uninterrupted trimming without the hassle of manually feeding the line. Plus, these trimmers are designed to be efficient and reliable, making them a popular choice for both homeowners and professionals.

Just remember to follow the manufacturer’s guidelines for maintenance and operation to keep your auto feed string trimmer performing at its best.


1. Do I need to manually adjust the string length on an auto feed string trimmer?

No, you do not need to manually adjust the string length on an auto feed string trimmer. The trimmer will automatically release more line as needed.

2. Can I use any type of replacement string with an auto feed string trimmer?

It is recommended to use specific replacement strings that are compatible with your particular brand and model of auto feed string trimmer for optimal performance.

3. How do I refill the spool on an auto feed string trimmer?

Refilling the spool on an auto feed string trimmer usually involves removing the empty spool, threading a new length of replacement line through the holes or eyelets in the spool, and securing it in place before reattaching it to the trimmer.

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