My Petrol Strimmer/Brush Cutter is experiencing excessive vibration

Contents

• Identify the Source of the Vibration
• Vibration from the Engine Housing
• Vibration from the Shaft

Identify the Source of the Vibration

The first step is to determine where the vibration is originating from. Excessive vibration will typically come from either:

• The engine housing
• The drive shaft assembly

Identifying the source of the vibration will help determine the appropriate corrective action.

Vibration from the Engine Housing

If the vibration appears to be coming from the engine housing:

1. Stop the engine and allow it to cool completely.
2. Inspect all visible screws, bolts, and fasteners.
3. Ensure they are secure and correctly tightened.

If all fasteners are secure and the vibration persists, there may be an internal engine fault that requires further investigation.

Possible causes include:

• Damaged engine components
• Excessive engine wear
• Internal mechanical failure

In these cases, the engine should be inspected by a qualified technician.

Vibration from the Shaft

If the vibration is coming from the shaft assembly, the internal drive cable may be bent, twisted, worn, or damaged.

Step 1 – Separate the Shaft Sections

Disconnect the upper and lower shaft sections according to the instructions in your user manual.

Step 2 – Check the Lower Shaft

1. Rotate the strimmer head or brush cutter blade by hand.
2. While rotating it, look down the lower shaft tube.
3. Observe whether the internal drive cable rotates smoothly.

Step 3 – Check the Upper Shaft

⚠️ Warning: Keep hands, clothing, and loose objects clear of moving parts during this check.

1. Start the engine.
2. Look down the upper shaft tube.
3. Gently apply throttle while observing the internal drive cable.

Results

• If vibration or irregular movement is observed in the lower shaft, the lower shaft assembly may require replacement.
• If vibration or irregular movement is observed in the upper shaft, the upper shaft assembly may require replacement.