How to Install a Universal Trimmer Head

A universal trimmer head is a great way to save time and money when it comes to maintaining your trimmer. In this blog, we’ll show you how to install a universal trimmer head on your trimmer.

Checkout this video:

Materials Needed

-One universal trimmer head
-Adjustable wrench
-Phillips head screwdriver

It is important to note that the size of the trimmer head will be determined by the size of the shaft on your trimmer. Be sure to check this before you purchase a new head.

##Heading:Step One – Unscrew The Old Head##
Use an adjustable wrench to loosen and remove the bolts that are holding on your old trimmer head. Once the bolts are removed, the head should easily come off of the shaft. If it does not, you may need to use a pair of pliers to remove it.

##Heading:Step Two – Remove The Trimmer Line##
Remove any old trimmer line from the old head and dispose of it properly. If there is any line remaining on the trimmer shaft, use a pair of pliers to remove it.

##Heading:Step Three – Mount The New Head##
Line up the new head with the holes on the shaft and thread in the bolts by hand. Once all of the bolts are in place, use the adjustable wrench to tighten them down. Be sure not to over tighten, as this could damage the new head or strip the threads on the shaft.

1 Universal trimmer head

Installing a universal trimmer head is a relatively easy task that can be completed in just a few minutes. Most universal trimmer heads come with instructions on how to install them, but the process is generally the same regardless of the brand or model.

First, you will need to locate the manufacturer’s instructions. These can usually be found online or in the booklet that came with your trimmer head. Once you have located the instructions, review them carefully before beginning the installation process.

Next, locate the proper size allen wrench for your trimmer head. This information can also be found in the manufacturer’s instructions. Once you have located the allen wrench, insert it into the hole in the center of the trimmer head.

Now, begin tightening the allen wrench clockwise until it is snug. Do not overtighten or you may strip the threads. Once the allen wrench is tight, remove it and set it aside.

Now, take your new universal trimmer head and line up the holes with those on your trimmer shaft. Once aligned, insert a bolt through each hole and hand-tighten until snug. Again, do not overtighten as this could strip the threads or damage your equipment.

Once all bolts are tight, give each one a final turn with a wrench to ensure they are secure. You should now have a successfully installed universal trimmer head!

1 Trimmer line

Assuming you have the model that takes curved trimmer line,you’ll need to first insert the supplied retainer collar into the trimmer head. Make sure the retainer collar is locked in place by pushing it all the way down. You should hear it snap into place.

With the retainer collar in place, insert one end of the trimmer line into the notch at the bottom of the retainer collar, and then pull the trimmer line through until there’s about 6 inches (15 cm) of line sticking out.

Wrap the trimmer line around the raised portion of plastic in a clockwise direction until you’ve wrapped it around 3-4 times. The number of times you wrap it around will depend on how thick the trimmer line is. Once you’ve wrapped it around 3-4 times, insert the end of the trimmer line into the notch at the top of retainer collar.

Now pull on both ends of the trimmer line until it’s tight, then use a pair of scissors to trim off any excess line so that about 1/2 inch (1 cm) is sticking out from either side of the head.

1 Screwdriver

1 Screwdriver
2 open-end wrenches
3 Socket wrench and ratchet
4 Phillips screwdriver
5 Adjustable wrench
6 pry bar (optional)

1. Secure the trimmer head to the workbench with a vise or clamps. This will make it easier to remove the old head and install the new one.
2. Remove the spool retainer cap by unscrewing it with a screwdriver. The cap is usually attached to the spool with a wing nut, which can be removed by hand. If the wing nut is difficult to remove, use an open-end wrench or a socket wrench and ratchet.
3. Take out the spool of string and discard it. Some trimmer heads have a bump feed mechanism that allows you to simply push down on the head to release more string while you’re trimming. If your old head had this feature, make sure that the new one you select has it as well.
4. Unscrew the mounting plate from the trimmer head with a screwdriver or wrench, depending on how it’s attached. The mounting plate is what keeps the trimmer head attached to the shaft of your trimmer. On some models, you may need to remove bolts or screws that hold the plate in place; on others, you may be able to simply unscrew it by hand. Be sure to keep track of all of the parts so that you can reassemble them later.
5. Remove any washers or gaskets that may be on the shaft of your trimmer where the head was mounted; these will need to be replaced when you install the new head. If you have difficulty removing them, use an adjustable wrench or pliers.


It is important to read the instruction manual before beginning any installation. It is also a good idea to have all of the necessary tools gathered before beginning. This will make the job go quicker and easier. The following tools will be needed for this installation: a clean cloth, a Phillips head screwdriver, and a new universal trimmer head.

Step One: Remove the Old Trimmer Head

Begin by removing the old trimmer head from the trimmer. In most cases, this will simply involve unscrewing the head from the trimmer shaft. However, some trimmer models may require the use of a special tool to remove the head. Check your trimmer’s owner’s manual for specific instructions on how to remove the old head.

Step Two: Inspect the Trimmer for Damage

Before you attempt to install the new trimmer head, it’s important to inspect the trimmer for any damage. If there is damage, it’s important to repair it before you install the new head, as damaged parts could cause the new head to become installed incorrectly.

Step Three: Install the New Trimmer Head

Now that you have the new trimmer head, it is time to install it. Start by removing the old trimmer head. Once the old trimmer head is removed, take a look at the new trimmer head and familiarize yourself with the parts.

There are three main parts to the new trimmer head: the adapter, the spool, and the cap. The adapter is what will attach the new trimmer head to your trimmer. The spool is where your line will be wound. The cap is what holds everything in place.

To install the new trimmer head, start by attaching the adapter to your trimmer. Once the adapter is attached, thread your line through the holes in the spool (consult your owner’s manual for specific instructions on how to do this). Once your line is through the holes in the spool, put the cap on and screw it into place.

And that’s it! You have now successfully installed your new universal trimmer head.

Step Four: Test the New Trimmer Head

Now that the new trimmer head is installed, it’s time to test it out. Start by tying the flywheel to the crankshaft. To do this, first remove the spark plug so the engine won’t start unintentionally. Next, use a socket and ratchet to loosen the retaining bolt on the flywheel. Finally, wrap a length of rope around the flywheel and pull it toward you until it’s snug against the crankshaft.

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