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Model Fit Guide
compatible OEM Part Number:
Oregon 191-139
GX20249, GX20433, GY20567
Specifications
Length: 21-13/32"
Center Hole Size: 0.68
Outer Hole Size: 0.41
Center to Center: 3.7
Plane: Formed
Width: 2.5
Thickness: 0.164
Cut Direction: RH
Center Hole Shape: Circle
Outer Hole Shape: Circle
Package Included:
2XLawn Mower Blades
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2."How do I know if my lawn mower blade is dull?"
A:"Signs that your lawn mower blade is dull include ragged or torn grass edges, uneven cutting, or the mower struggling to cut through thicker patches of grass. You may also notice clumps of grass being left behind after mowing."
3."Can I replace just one lawn mower blade?"
A:"It is possible to replace just one blade if only one is damaged, but for better balance and performance, it’s recommended to replace both blades (if your mower has a two-blade system) to ensure even cutting and avoid putting extra strain on the engine."
4."How do I sharpen a lawn mower blade?"
A:"To sharpen a lawn mower blade, you typically need to:
Remove the blade from the mower.
Secure it in a vice or clamp.
Use a sharpening tool, such as a file, sharpening stone, or power grinder, to grind the cutting edge at an angle (usually around 30 degrees).
Reinstall the blade, ensuring it’s balanced and properly aligned."
5."Should I replace my lawn mower blade or sharpen it?"
A:"If the blade is heavily damaged, bent, or cracked, it's best to replace it. However, if it’s only dull, sharpening is usually sufficient and cost-effective."
6."How do I balance my lawn mower blade?"
A:"After sharpening, it's important to ensure the blade is balanced. You can do this by placing the blade on a nail or screwdriver held horizontally. If the blade tilts to one side, sharpen the heavier side a bit more to achieve balance."
7."What causes lawn mower blades to dull quickly?"
A:"Lawn mower blades can dull quickly due to mowing over hard surfaces like rocks, tree roots, or concrete, as well as cutting wet or dense grass. Mowing at a fast speed or using the mower on uneven terrain can also contribute to faster dulling."
8."Can I use a power tool to sharpen my lawn mower blade?"
A:"Yes, you can use a power tool like a bench grinder or an angle grinder to sharpen your lawn mower blade quickly. Just be careful to maintain the proper angle and avoid overheating the blade, which can damage its metal."
9."How do I know if my lawn mower blade needs to be replaced?"
A:"You should replace the lawn mower blade if it is cracked, bent, or chipped, as these issues can affect the cutting performance and damage the mower. If the blade has severe wear or can't be sharpened properly, it’s time for a replacement."
10."Can I use any lawn mower blade for my mower?"
A:"No, lawn mower blades are designed to fit specific models. Always check the manufacturer’s specifications for the correct type and size of the blade to ensure optimal performance and safety."
11."How do I install a lawn mower blade?"
A:"To install a new lawn mower blade, you typically need to:
Disconnect the spark plug for safety.
Remove the old blade by loosening the bolt that holds it in place.
Install the new blade, ensuring it's positioned correctly (check for any arrows or markings that indicate the proper orientation).
Tighten the bolt securely before reconnecting the spark plug."
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