How To Change Brush Cutter Blade

How To Change Brush Cutter Blade

The brush cutter is one of the essential tools to help keep your garden clean. This machine can handle grasses, cut them, and even cut stubborn and hard-to-reach plants. But this machine requires maintenance and should only be used for the right jobs. In the maintenance phase, an important step is changing the blade. You may find it complicated, but don’t worry. The following article will explain how to properly and safely change your blade.

Why and when should a brush cutter blade be changed?

When the blade’s condition affects the machine’s operation, you should replace it. Edges in poor condition will make cutting more difficult. Your cutter will be harder to cut, and your job will take longer.

You should note that you must regularly check the condition of the blade. When the state of the edge deteriorates, it affects your work and risks. Specifically, when in poor condition, the blade of the brushcutter can be thrown out of the machine, quickly causing you to experience injuries.

In addition, you may also need to change the blade to match the types of plants you will be cutting. Different blades are suitable for cutting various types of plants.

The technique to change the blade of a brushcutter

Most manufacturers offer interchangeable tools and blades. If you are changing means outdoors, place them where you can easily see the small tools or nuts in case you drop them. It is pretty easy if you follow these steps:

  • Make sure your machine is idle, and use a pair of gloves to protect your hands. It is necessary because replacing this part requires rigor and care.
  • Now use a spark plug wrench to remove the pins, nuts, and screws.
  • Remove the old blade from the holder and place the new blade in.
  • Replace nuts and screws, then tighten by turning counterclockwise.

With the above easy steps, you can replace the blade at home. Here’s how to replace a regular blade. So when you want to convert the trimmer head into a brush cutter and vice versa, how do you do it? Please refer to the following ways:

How do I change the trimmer head to a brush cutter blade?

Currently, there are two types of Qualcast brush cutters: GDB30B and RG415-495409. To change from lawn mower to brushcutter and vice versa, for these two types of machines, we do the following:

For GDB30B:

  • Adjust the groove in the flanged rotating part with the track at the top of the gear.
  • Place the hex wrench through the slots in the washer to lock the flange and gear head together.
  • Remove the lawn mower head assembly by turning it clockwise by hand.
  • Remove the cup washer and flange washer, then keep it to install the blade.
  • Place the flanged washer on the gear head shaft, aligning the hollow side towards the gear head.
  • Align the blade in the center on the flanged rotary so that the blade part is flat and the lifting shaft of the flanged rotary portion passes through the hole in the blade.
  • Install the rotating part with the cup and center protruding from the blade.
  • Place the nut on the gear head shaft.
  • Use a hex wrench to pass through the slots in the flanged washer and the gear head to hold the nuts while tightening the nuts.
  • Install the blade nut by turning counterclockwise.
  • Use a wrench to tighten the blade nut.

Here are the steps to change from a lawn mower to a brush cutter. If you want to change from brush cutter to lawn mower, do the opposite.

For RG415, do the following:

  • Secure the flange with an Allen key.
  • You do turn the nut clockwise to remove the blade.
  • Remove a layer of shield.
  • Still keep the flange tight, and at the same time, install the stripe cutter to the shaft.
  • Perform anti-clockwise rotation until it is in place.
  • Take out the Allen key.
  • If you want to reinstall the blade, remove the ribbon cutter and place the shield washers in the same way you removed them.
  • Hold the flange with an Allen lock when tightening the bottom nut.

Which blade to choose and where can we buy it?

The choice of blade is essential because the brush cutter performance depends on it. You can choose and change many types of tools to suit the style of the plant to be cut.

Our advice is to choose a steel blade. This blade type is popular in practice because it is suitable for most machines. It can also easily be replaced by any other kind without consulting the manufacturer. However, if you want to replace repair parts, pay attention to the references for these parts provided by the manufacturer.

Each type of plant will need to use a suitable blade for cutting. Therefore, consider the types of plants in your garden to make the right choice.

  • Lawn mower: with 2 to 8 teeth, you can cut the grass any year.
  • Four-tooth blade: perfect for cutting dense grass or hard trunks.
  • Special blade: you can use it to cut thorn bushes without getting caught or stuck in the blade.
  • Multi-sided disc: used for cutting thin branches and small shrubs.

Please note that the blade selected must have the correct diameter and number of teeth to be compatible with your brush cutter. If the diameter is more significant, it means that the engine of the machine must work harder. The large diameter but few teeth also easily lead to the engine being pressed and causing damage. And you’ll probably have to sharpen the blade so your brush cutter can work better.


You can easily find the parts mentioned in the article at DIY stores, gardening centers, or professional motorcycle shops. In addition, you can also refer to the brush cutter manufacturer where you bought the machine. Try doing the replacement of the blades for your brush cutter yourself. It can be a bit difficult at first. However, we believe you can do it if you carefully read the information in our article.

Related Post: How To Use A Brush Cutter? (Tips For Handheld Brush Cutters)