2. Locate the drive belt. It is a long, black belt that runs from the engine to the transmission.
3. Remove the old drive belt. To do this, you will need to loosen the tensioner pulley. The tensioner pulley is located on the side of the engine.
4. Install the new drive belt. Wrap the new drive belt around the pulleys in the same way as the old drive belt.
5. Tighten the tensioner pulley. This will hold the drive belt in place.
6. Reinstall the mower deck.
Here is a diagram of the drive belt route for a John Deere LX186:
[Image of drive belt route for a John Deere LX186]
Note: The drive belt route may vary slightly depending on the year and model of your John Deere LX186. If you are unsure of how to route the drive belt, consult your owner's manual.