1. Disconnect Spark Plug:
- Start by disconnecting the spark plug wire from the spark plug. This is crucial for safety and prevents the engine from accidentally starting during the repair.
2. Locate the Flywheel:
- The flywheel is usually located on the side of the engine, attached to the crankshaft. It's typically a large, round, and sometimes slotted metal disc.
3. Remove Flywheel Cover:
- On most mowers, there's a cover or housing around the flywheel. Remove this cover to access the flywheel key.
4. Inspect Flywheel Key:
- Once the flywheel is visible, inspect the flywheel key. It's a small, rectangular piece of metal that fits into a slot between the flywheel and crankshaft.
5. Remove Old Flywheel Key:
- Use a flat-head screwdriver or key removal tool to gently pry the old flywheel key out of its slot. Be careful not to damage the surrounding metal surfaces.
6. Clean Key Slot:
- Clean the key slot on both the flywheel and crankshaft using a wire brush to remove any debris, grease, or rust. This ensures a proper fit for the new key.
7. Install New Flywheel Key:
- Insert the new flywheel key into the slot on the flywheel. Make sure it's fully seated and aligned properly.
8. Apply Locktite (Optional):
- Some people recommend applying a thread-locker (e.g., Locktite) to the flywheel key to prevent it from coming loose during operation. This step is optional but can provide added security.
9. Reinstall Flywheel Cover:
- Place the flywheel cover back on and secure it with the necessary bolts or screws.
10. Reconnect Spark Plug:
- Reattach the spark plug wire to the spark plug.
11. Test Mower:
- Once everything is reassembled, attempt to start the mower and ensure that it operates properly.
Note:
- If the mower doesn't start, or if you encounter any difficulties during the process, refer to your mower's service manual for specific instructions related to your model.
