To determine when to replace your lawn mower blade, look for four key signs: if the blade is more than two years old, if it has been sharpened twice and remains dull, if there are visible dents, gouges, or missing pieces, and finally, if the blade is bent. It is crucial to handle blade maintenance safely by disconnecting the lawn mower spark plug and using protective work gloves. Always choose the manufacturer-recommended blades for your specific lawn mower model to ensure safe and effective operation. For replacements, check lawn mower parts to find suitable options for your mower.
1. It’s more than two years old.
As a general rule of thumb, a mower blade should be replaced every one to two years for safety and performance purposes.
2. It’s bent.
It’s extremely common for blades to bend when you accidentally mow over rocks or other large objects. A bent, off-balance blade is a safety concern and may cause premature damage to the lawn mower such as destroying the bearings.
3. It’s dull and you’ve already sharpened it twice.
A sharp blade is essential to a healthy lawn. Dull blades tear grass, rather than cut, causing ragged tips and a widespread yellow hue over the lawn. If you’ve already sharpened the blade twice, it’s best to replace the blade. Repeated sharpening weakens blades, making them brittle and more susceptible to dangerous damage.
4. There are dents, gouges and/or pieces missing.
Deep dents, gouges and missing pieces are a major safety hazard. If there is any damage, it’s time to replace your blade. Pebbles and other small debris can be propelled at high speeds, which can cause fatal accidents. Damaged blades increase the risk of objects being propelled.
Other important safety reminders:
- Now that you know when to change lawn mower blades, keep these safety tips in mind. Always use the blades recommended by the lawn mower manufacturer for your particular model. This is important to safety and to the proper operation of the lawn mower. Blades marketed as a “universal” fit should be avoided.
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