How to Replace Hedge Trimmer Blades

Hedge Trimmers, due to daily use, may lose its blades’ sharpness towards inevitable replacement. Fortunately, replacement parts are readily available from blades to motor parts. Hedge trimmer blades are necessary to be replaced every now and then to ensure that the hedge trimmer does deliver its specific results.

Over time, the steel components of the blades give in to the tremendous strain it experiences from encountering different kinds of plants. But what can affect the longevity of the blades in the first place?

For most of its users, correct operation of the best hedge trimmer is important, as mentioned in the previous article. Following the downward motion while cutting protects the blades from unusual stress and uneven cutting tension especially against hard vines and trunks. However, nothing lasts forever, such as the blades – prompting its user to replace the parts to continually use the hedge trimmer.

Replacing the blades is an easy task for any skilled gardener who has handled a hedge trimmer for a while. Before going to the step by step procedure, it is important that a few safety reminders be followed in order for the correct installation of the blades be done accordingly.

According to, it is necessary that the hedge trimmer, along with the other tools, should be done on a flat even surface for the hedge trimmer not to wobble while replacing blades. This will protect the user from any untoward incidents resulting in injury. Wearing safety gloves shall also ensure the safety of the user before removing the blades from its mount to avoid cuts. With these in mind, here is the step by step procedure on how to replace hedge trimmer blades:

Step One: For fuel operated hedge trimmers, drain the fuel first before operating

This is first and foremost before performing any repair or replacement on a fuel operated hedge trimmer. Draining the fuel for safekeeping is not only cost-wise to avoid purchasing new fuel, but also will avoid fire and spillage of fuel unto the motor tanks or the surrounding areas. The whole replacing process would tend to tilt and tip the hedge trimmer through the process, hence it is only primary that the user unloads fuel before anything else.

Step Two: Disengage the high tension wire to the spark plug

As any mechanical motor out there that operates via fuel, it is also advisable that the user disengages the spark plug by detaching the connecting wire of the motor to the plug. This process is done to avoid accidental operation of the hedge trimmer while replacing blades – which could cause serious injuries if not followed. Hedge trimmer motors consume fuel, and even so, after draining, there may be fuel still left in the system for it to operate unintentionally, so disengaging the spark plug should ensure safety.

Step Three: Turn the hedge trimmer right side up or left side up, exposing the main shaft’s underside

Turning the hedge trimmer right side up, or left side up will expose the bolts underneath the main shaft and the hedge trimmer blades. The main shaft holds 2 sets of cutting blades, both mounted on the shaft, opposite each other. These two blades are held together by a blade protect at the tip and bolts and nuts for a tight fit and secure mounting.

Step Four: Remove the blade protector at the tip

Before removing the bolts and nuts securing the hedge trimmers’ blades from the main shaft, it is important that the user first removes the blade protector at the tip of the hedge trimmer. The blade protector is positioned here to protect any person in front of the hedge trimmer during operation and also further an added security for the blades to not dislodge during cutting.

Step Five: Remove the nuts and bolts holding the hedge trimmer blades

After removing the blade protector tip, the user is now ready to remove the bolts and nuts holding the hedge trimmer blades on the main shaft. This is usually held in by three sets of bolts firmly, each positioned evenly on the length of the main shaft.

Step Six: Remove the gearbox bolts to expose the hedge trimmer blade mounting

If the main shaft has been dislodged of the bolt and nuts holding the hedge trimmer blades, it is now time for the user to remove the gearbox cover. The gearbox is wherein the main gear is held in, which is spun by the motor, moving the blades resulting in that cutting motion that the user experiences. The hedge trimmer blade is then secured by a lock which can be removed by hand. This lock can be seen at the edge of the gearbox chamber.

Step Seven: Remove the main gear, then the lower hedge trimmer blade

After removing the hedge trimmer blade locks inside the gearbox, the user may now finally remove the first set of the hedge trimmer blades. For the second set of the hedge trimmer blades, the main gear should be removed from the pin that holds it to access the second blades’ other end. Doing so would dislodge the blade and is now ready for replacement.

Step Eight: Replace the blades and return the main gear into position

Once the second replacement blade has been mounted, the user may know mount again the main gear unto the pin. It is important that the main gear should be returned into position before mounting the first replacement blades. Securing the hedge trimmer lock in place shall also be done in this process.

Step Nine: Return the gearbox cover, then secure again the hedge trimmer blades with its bolt

Once the hedge trimmer lock has been secured, the gearbox cover may now be returned safely. Again, securing its pin locks are important in order to avoid exposing the spinning gears within the gearbox. This will also prevent any moisture in the gearbox so as to avoid rust. Taut the bolt and nuts in place through the main shaft, and then re-attach the hedge trimmer tips afterward.

Step Ten: Reattach the spark plug wire and return the fuel

Accomplishing the previous steps ensures that the hedge trimmer blades are now properly replaced. Now, the hedge trimmer is now ready for operation once again by returning the fuel into the fuel tank and reattaching the spark plugs’ tension wire. In most cases, operators pump lithium grease into the gearbox to ensure ample lubrication within.

You may read How to Clean Hedge Trimmers or How to Sharpen Hedge Trimmer with Dremel

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