Have you ever encountered this situation: the lawn mower is running well, but the machine suddenly makes a loud noise, accompanied by a large vibration, and suddenly stops. Although mechanical aging may also cause this kind of situation, this abnormal noise is likely to remind you that a part of the lawn mower may have failed.
Today, we will take the abnormal metal noise as the starting point to take you through the step-by-step troubleshooting, help you determine the source of the fault, and figure out whether some lawn mower parts have problems and how to solve the
Step 1: Determine the Type of Abnormal Noise & When It Occurs
The first step in troubleshooting is to correctly identify the type of these abnormal noises, the source of the sound, and the time of occurrence.
Here are some points you need to confirm:
- Is it when starting or when running at high speed?
- Is it a continuous metal friction sound or an intermittent impact sound?
- Does the sound come from the bottom or the side of the fuselage?
If what you’re hearing sounds like a loud clanking noise, chances are the problem lies with the blade or its mounting components. But if it’s more of a high-pitched squeaking sound, it could be dry or poorly lubricated bearings.
Step 2: Turn off the Machine & Check 3 High-risk Parts
After turning off the power or unplugging the spark plug, we start the “detective mode” and start from the following three parts:
1. Check If the Blade is Loose or Deformed
Shake the blade gently by hand. If it feels loose, it means that the fixing screw may be disengaged or not tightened enough. Bends, notches, and deformations on the edge of the blade can also cause the lawn mower to be unbalanced when turning, and the sound of the impact may also come from these imbalances.
2. Check the Blade Connecting Shaft & Bottom Nut
The blade is connected to the engine output shaft through a shaft. If this shaft is offset, worn, or the nut is loose, it will cause the blade to shake at high speed and make a metallic impact sound. At this time, it is best to replace the corresponding lawn mower parts, such as a new fixing shaft, bolts, or blade seat.
3. Check the Bearings & Transmission System
The friction sound is mostly related to the aging of the bearing. You can gently turn the blade or axle to see if there is any jamming or “dryness”. If there is, it means that the bearing may be short of oil or even damaged and needs to be cleaned or replaced.
Step 3: Replacement Plan & Precautions
If you find that a part is damaged or seriously aged during the inspection, don’t hesitate to replace it. Lawn mower parts are not as complicated as engines, and many accessories can be replaced by yourself. For example, blades, bolts, bases, and even some bearings, you can find the corresponding models in regular channels.
But pay attention to the following points:
Matching models is the most important: different lawn mower brands or models use different blade lengths and hole spacings. Don’t buy cheap ones casually.
Don’t be greedy and choose three-no products: inferior parts will loosen or wear out after a few uses, which will not only waste money, but also cause more serious damage.
It is recommended to give priority to original accessories or certified compatible parts, which are worry-free, labor-saving, and durable.
Conclusion
The abnormal metal noise of the lawn mower is not a small problem, it is often the beginning of a bigger fault. As long as you can check and replace the problematic lawn mower parts in time, not only can the machine continue to work efficiently, but also avoid subsequent chain repair costs.
3 Steps to Troubleshoot Lawn Mower Abnormal Noise
