How to Sharpen Great States Reel Mower Blades at Home

A dull reel mower tears grass rather than cutting it, leading to brown tips and an unhealthy lawn. Learn the step-by-step process for sharpening your Great States reel mower to ensure a clean, precise cut every time you mow. Maintaining sharp blades is the most important task for achieving a professional, lush appearance.

Before you begin, understand that sharpening a reel mower requires patience and the right tools. While you can handle this maintenance at home, it is a delicate process that demands precision to align the blades correctly. Regular sharpening extends the life of your equipment and protects your grass from unnecessary stress and disease.

In this guide, we will walk you through the essential techniques to restore your mower’s performance. You will discover how to safely access the blades, apply the proper grinding compound, and make the necessary adjustments for a perfect fit. Follow these clear instructions to keep your lawn looking vibrant and healthy all season.

Safety First and Preparation

Before you begin sharpening your reel mower, prioritize your safety. A reel mower’s blades are designed to shear grass with precision, which means they are exceptionally sharp and can easily cause deep cuts if handled improperly. Taking a few minutes to prepare your workspace will prevent accidents and ensure a smooth maintenance process.

Start by moving your mower to a flat, stable, and well-lit surface, such as a workbench or a level concrete floor. Avoid working on grass or uneven ground, as the mower could shift or tip, leading to potential injury. Once positioned, ensure the mower is completely immobilized so it cannot roll or move while you are working on the blades.

Follow these essential safety steps before you touch the blades:

• Wear heavy-duty work gloves: Always use thick, puncture-resistant leather or cut-resistant gloves. These provide a critical barrier between your skin and the razor-sharp reel edges.
• Disengage all mechanisms: If your mower has a drive engagement lever, ensure it is set to the “off” or “neutral” position. If it is a gas-powered model, remove the spark plug wire to prevent the engine from accidentally starting.
• Clear the area: Remove any loose tools, debris, or children and pets from your immediate workspace to maintain focus.
• Stabilize the reel: If your specific model allows, use a piece of scrap wood to gently wedge the reel in place, preventing it from rotating while you apply the sharpening compound or use your file.

Never attempt to sharpen the blades while the mower is upright and potentially mobile. If you need to tilt the mower to access the underside, ensure it is braced securely against a wall or heavy object. By taking these precautions, you protect yourself from accidental engagement and lacerations, allowing you to focus entirely on restoring your mower’s cutting performance. Remember, a sharp mower makes for a healthy lawn, but safety must always come first.

Cleaning and Inspecting the Reel

Before you begin sharpening, you must thoroughly clean the reel assembly. Debris, dried grass clippings, and hardened tree sap act as a barrier, preventing your sharpening tool from making consistent contact with the steel. If you attempt to sharpen over this buildup, you will achieve an uneven edge and potentially damage your sharpening kit.

Start by ensuring the mower is completely disabled. Remove the spark plug wire if you have a gas-powered model, or remove the battery for electric versions. This simple step prevents accidental engagement while your hands are near the blades.

Use the following steps to prepare the reel:

• Clear loose debris: Use a stiff-bristled nylon brush to scrub away dried grass and dirt from the reel blades and the bed knife. Avoid using wire brushes, as they can scratch or prematurely dull the precision-ground edges.
• Remove sap: If you notice hardened sap, apply a small amount of household degreaser or a specialized blade cleaner. Let it sit for a minute, then wipe it away with a rag.
• Use compressed air: If available, use a burst of compressed air to clear out tight crevices behind the bed knife where small pebbles or grit often lodge.

Once the metal is clean and dry, perform a visual and tactile inspection. Run a gloved finger carefully along the length of each blade and the bed knife to check for damage.

Look specifically for:

• Deep gouges: Small, superficial nicks are normal and can be smoothed out during the sharpening process. However, deep gouges or large chips in the metal indicate structural damage.
• Bent blades: If a blade appears wavy or bent, the reel is likely out of alignment.
• Severe pitting: Heavy rust or deep pitting can compromise the integrity of the steel.

If you find significant structural damage, simple sharpening will not restore the mower’s performance. In these cases, consult a professional technician to determine if the reel needs to be professionally ground or replaced entirely.

Applying Sharpening Compound

Backlapping is the gold standard for maintaining a precise cut on your reel mower. By using a specialized valve-grinding compound, you effectively hone the reel blades against the bed knife, ensuring they maintain a scissor-like shearing action rather than tearing the grass.

Before applying the compound, ensure your mower is stable and the blades are clean. Debris can cause uneven wear or damage the cutting edges. Follow these steps for the most effective application:

• Select the right grit: Use a medium-grit (typically 80 to 120) valve-grinding compound. This is coarse enough to remove minor imperfections but fine enough to provide a smooth finish.
• Apply sparingly: Using a small, stiff-bristled paintbrush, apply a thin, consistent layer of the compound directly to the leading edge of each reel blade.
• Focus on the contact point: The compound must be placed exactly where the reel blade meets the bed knife. If you apply it too heavily, it will simply fall off; a light, uniform coating is far more effective.
• Distribute evenly: Rotate the reel manually to ensure the compound is spread across the entire length of the bed knife. Consistency here is the key to preventing “high spots” where one section of the blade gets sharpened more than another.

Once the compound is applied, rotate the reel in reverse—either by hand or using a drill attachment—to begin the sharpening process. You should hear a consistent, gritty “hissing” sound as the blades make contact. If the sound becomes too quiet, you may need to apply a small amount of water or a light oil to the mixture to keep the paste active and moving across the metal surfaces.

Always wear safety glasses during this process, as the abrasive compound can be flicked outward as the reel spins. Once the blades are sharp, thoroughly wash away all remaining compound residue with water to prevent premature rusting or excessive wear during your next mow.

The Backlapping Process

Backlapping is the most effective way to maintain a precision cut without disassembling your reel mower. By rotating the reel in reverse—the opposite direction of normal mowing—you grind the reel blades against the stationary bed knife. This process restores the sharp, scissor-like edge necessary for a clean cut that prevents grass tips from browning.

To begin, apply a medium-grit valve grinding compound evenly across the leading edge of each reel blade using a small paintbrush. You can purchase this paste at most automotive or hardware stores. Ensure the compound is distributed uniformly to achieve an even grind.

There are two primary methods to perform the rotation:

• Manual Method: Use the mower’s handle or a hand crank to rotate the reel backward. This method is slow but offers maximum control, making it ideal for beginners who want to avoid removing too much metal.
• Drill Attachment: If your mower model allows, attach a drill to the reel shaft using a specialized adapter. Set the drill to a low speed to prevent overheating the metal.

As you rotate the reel, you will hear a harsh, grinding noise. Continue the process until the sound transforms into a consistent, quiet “swishing” sensation across the entire width of the mower. This indicates that the reel blades and the bed knife are perfectly mated.

Once you reach this stage, stop immediately to prevent excessive wear. Thoroughly clean all remaining grinding compound from the blades and the bed knife using a rag and a mild degreaser. Any leftover grit will continue to act as an abrasive, which can prematurely dull your blades during your next mowing session.

Finally, perform a paper test. Slide a strip of newspaper between the reel and the bed knife; if the blades slice the paper cleanly without tearing, your mower is ready for the lawn. Always wear heavy-duty work gloves during this process to protect your hands from the sharp edges of the blades.

Final Adjustments and Ongoing Maintenance

Once you have finished sharpening your reel mower, the cleanup process is critical for both machine longevity and lawn health. Thoroughly remove all remaining grinding compound from the blades using a stiff-bristled brush and a damp cloth. Any residue left behind acts as an abrasive, which will rapidly dull your freshly sharpened edges and can damage the reel mechanism during operation.

After cleaning, you must adjust the bed knife to achieve the perfect cutting action. The goal is a precise, scissor-like cut rather than a crushing effect. Follow these steps for a safe adjustment:

• Ensure the mower is completely disabled by disconnecting the spark plug wire (for gas models) or removing the battery (for electric models).
• Place a thin strip of newspaper between the reel blade and the bed knife.
• Slowly rotate the reel by hand. The blade should slice through the paper cleanly at every point along the entire length of the bed knife.
• If the paper does not cut, tighten the adjustment screws on the bed knife in small, incremental turns.
• The blades should “kiss” the bed knife lightly; they should not be pressed so tightly that they create significant friction or prevent the reel from spinning freely.

Test the mower on a small patch of grass. A well-adjusted reel mower should leave a clean, crisp finish without tearing the grass blades. If you notice uneven cutting—where one side of the mower cuts lower than the other—it indicates that the reel is likely out of parallel with the bed knife.

If simple adjustments fail to resolve cutting issues, avoid forcing the blades together. This can cause permanent damage to the metal. At this stage, the reel may require professional alignment or a “spin grind” performed by a technician with specialized equipment. Regular maintenance, such as keeping the blades clean and dry after each use, will significantly extend the time between these professional services and keep your lawn looking its best all season long.