Sharpening blades is a key task when performing regular maintenance on your MTD mower. The blades on your walk-behind mower will experience normal wear and tear over time, but with regular maintenence you can be confident that your equipment will continue to operate properly for the seasons and years to come.
1. Safety first. Disconnect the spark plug wire from the spark plug and set the mower on its side with the carburetor and air filter facing up.
2. The blade and blade adapter are connected to the engine crankshaft by a blade bell support and a hex bolt. Remove the bolt and bell support. Next you can remove the blade and adapter from the crankshaft.
3. Do not try to sharpen your blade while it's still attached to the mower. Use a file or grinding wheel and follow the original grind and angle. To keep the blade balanced, grind each cutting edge equally.
4. Before reattaching the blade, you should test for balance. Do this by placing the blade on a round shaft screw driver; grind metal from the heavy side until it's balanced.
5. With light oil, lubricate the inner surface of the blade adapter and engine crankshaft. Then slide the blade adapter onto the engine crankshaft.
6. Make sure the side of the blade including the part number or marked "bottom" faces the ground when the mower is upright. Place the blade on the adapter and make sure it's seated and aligned on the blade adapter flanges.
7. Now replace the blade bell support. Make sure the notches on the bell support align with the small holes on your blade.
8. Replace the hex bolt and tighten to the recommended torque as outlined in your owner's manual. Reconnect the spark plug wire and turn your mower back to its operating position.
Regularly checking your blades for wear and tear and your blade bolt for correct torque will help your MTD walk-behind mower maintain optimum operation. If you have other questions about parts or operation of your mower, you can always contact a trained specialist.