1. Park the lawnmower on a level surface and engage the parking brake.
2. Remove the cotter pin from the wheel axle bolt.
3. Loosen the wheel axle nut using a wrench.
4. Slide the wheel off the axle shaft.
5. Reinstall the cotter pin to secure the wheel axle nut.
When reinstalling the wheel, be sure to tighten the wheel axle nut securely to ensure that the wheel does not come off while the lawnmower is in operation.