If your treadmill belt is worn out and cannot be lubricated, it may be time to replace it. Here are the steps to replace the treadmill belt and deck: 

1. Remove the Old Belt: Use a screwdriver to remove the screws that hold the belt in place. Lift the belt off the deck and remove it. 

2. Remove the Deck: Use a wrench to remove the bolts that hold the deck in place. Lift the deck off the treadmill. 

3. Install the New Deck: Place the new deck onto the treadmill and secure it in place with bolts. 

4. Install the New Belt: Place the new belt onto the deck and secure it with screws. 

5. Test the Belt: Turn on the treadmill and test the belt's performance to ensure that it is running smoothly.